Patent Publication Number: US-2023142100-A1

Title: Inspection assistance apparatus, inspection assistance method, and computer readable recording medium

Description:
TECHNICAL FIELD 
     The invention relates to an inspection assistance apparatus and an inspection assistance method for assisting inspections that use electromagnetic waves, and further relates to a computer readable recording medium with a program for realizing these apparatus and method recorded thereon. 
     BACKGROUND ART 
     Articles that are imported to Japan from foreign countries include socially improper articles (such articles as various types of prohibited items and restricted items), hazardous materials in aviation, and so on. Inspections of imported articles are conducted using X-ray inspection apparatuses at, for example, customs, overseas mail sub-branch customs, and the like. Furthermore, similar inspections are also conducted at the bases of logistic service providers and the like. 
     As a related technique, patent document 1 discloses a sorting assistance apparatus for sorting whether inspection targets include a specific article. According to the sorting assistance apparatus of patent document 1, a transmission image obtained by irradiating inspection targets with electromagnetic waves is input to a model that outputs a degree of certainty that the inspection targets include a specific article, and whether the inspection targets include a specific article is determined with use of the degree of certainty output from the model. Note that the regarding the foregoing model, there are a plurality of models that respectively correspond to different intended uses, and an optimum model is selected and used in accordance with an intended use. 
     LIST OF RELATED ART DOCUMENTS 
     Patent Document 
     Patent document 1: Japanese Patent Laid-Open Publication No. 2019-174421 
     SUMMARY OF INVENTION 
     Technical Problems 
     However, specific articles, such as socially improper articles, included among inspection targets cannot be detected with high accuracy even by inspections that are conducted using an X-ray inspection apparatus or the sorting assistance apparatus of patent document 1. Therefore, in reality, inspectors further conduct inspections on-site independently from the inspections that use X-rays. 
     An example object of the invention is to provide an inspection assistance apparatus, an inspection assistance method, and a computer readable recording medium that improve the accuracy of detection of a specific article. 
     Solution to the Problems 
     In order to achieve the example object described above, an inspection assistance apparatus according to an example aspect of the invention includes: 
     a first certainty degree output unit configured to input, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and output a first certainty degree indicating that the article is a specific article; and 
     a first determination unit configured to determine that the article is the specific article in a case where the first certainty degree that has been changed based on an inspection result is equal to or higher than a pre-set first certainty degree threshold, the inspection result being obtained by conducting one or more inspections with respect to the article. 
     Also, in order to achieve the example object described above, an inspection assistance apparatus according to an example aspect of the invention includes: 
     a third certainty degree output unit configured to output a third certainty degree indicating that the article is a specific article, based on a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article; and 
     a second determination unit configured to determine that the article is a specific article in a case where the third certainty degree is equal to or higher than a pre-set third certainty degree threshold. 
     Also, in order to achieve the example object described above, an inspection assistance method according to an example aspect of the invention includes: 
     a first certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and outputting a first certainty degree indicating that the article is a specific article; and 
     a first determination step of determining that the article is the specific article in a case where the first certainty degree that has been changed based on an inspection result is equal to or higher than a pre-set first certainty degree threshold, the inspection result being obtained by conducting one or more inspections with respect to the article. 
     Also, in order to achieve the example object described above, an inspection assistance method according to an example aspect of the invention includes: 
     a third certainty degree output step of outputting a third certainty degree indicating that the article is a specific article, based on a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article; and 
     a second determination step of determining that the article is a specific article in a case where the third certainty degree is equal to or higher than a pre-set third certainty degree threshold. 
     Also, in order to achieve the example object described above, a computer-readable recording medium according to an example aspect of the invention includes a program recorded on the computer-readable recording medium, the program including instructions that cause the computer to carry out: 
     a first certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and outputting a first certainty degree indicating that the article is a specific article; and 
     a first determination step of determining that the article is the specific article in a case where the first certainty degree that has been changed based on an inspection result is equal to or higher than a pre-set first certainty degree threshold, the inspection result being obtained by conducting one or more inspections with respect to the article. 
     Furthermore, in order to achieve the example object described above, a computer-readable recording medium according to an example aspect of the invention includes a program recorded on the computer-readable recording medium, the program including instructions that cause the computer to carry out: 
     a third certainty degree output step of outputting a third certainty degree indicating that the article is a specific article, based on a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article; and 
     a second determination step of determining that the article is a specific article in a case where the third certainty degree is equal to or higher than a pre-set third certainty degree threshold. 
     Advantageous Effects of the Invention 
     As described above, according to the invention, it is possible to improve the accuracy of detection of a specific article. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a diagram for describing one example of an inspection assistance apparatus. 
         FIG.  2    is a diagram for describing one example of a system that includes an inspection assistance apparatus. 
         FIG.  3    is a diagram for describing the relationship between specific articles and certainty degrees. 
         FIG.  4    is a diagram for describing a data structure of the determination information. 
         FIG.  5    is a diagram for describing a data structure of the threshold information. 
         FIG.  6    is a diagram for describing a data structure of the determination information. 
         FIG.  7    is a diagram for describing a data structure of the model selection information. 
         FIG.  8    is a diagram for describing a data structure of the risk information. 
         FIG.  9    is a diagram for describing a data structure of the determination information. 
         FIG.  10    is a diagram for describing one example of the operations of the inspection assistance apparatus. 
         FIG.  11    is a diagram for describing one example of an inspection assistance apparatus. 
         FIG.  12    is a diagram for describing one example of a system that includes an inspection assistance apparatus. 
         FIG.  13    is a diagram for describing one example of the operations of the inspection assistance apparatus. 
         FIG.  14    is a diagram for showing one example of a computer that realizes the inspection assistance apparatus. 
     
    
    
     EXAMPLE EMBODIMENTS 
     First Example Embodiment 
     Below, an example embodiment of the invention will be described with reference to the drawings. Note that in the drawings described below, the elements that have the same functions or corresponding functions are given the same reference sign, and a repetitive description thereof may be omitted. 
     [Apparatus Configuration] 
     The configuration of an inspection assistance apparatus  10  in the example embodiment is now described using  FIG.  1   .  FIG.  1    is a diagram for describing one example of an inspection assistance apparatus. 
     The inspection assistance apparatus  10  shown in  FIG.  1    is an apparatus that improves the accuracy of detection of a specific article. Also, as shown in  FIG.  1   , the inspection assistance apparatus  10  includes a first certainty degree output unit  11 , a changing unit  12 , and a first determination unit  13 . 
     Among these, the first certainty degree output unit  11  inputs, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and outputs a first certainty degree indicating that the article is a specific article. 
     The transmission image is, for example, an image obtained from transmitted X-rays after irradiating an article, or an external package enveloping the article, with X-rays with use of an X-ray inspection apparatus and the like. 
     The model is a model that has been generated using AI (Artificial Intelligence), such as deep learning. The model is, for example, generated through machine learning by inputting a large amount of transmission images (data set) in a learning phase. The model is stored in a storage device provided inside the inspection assistance apparatus  10 , or in a storage apparatus provided independently from the inspection assistance apparatus  10 . 
     For instance, the first certainty degree is an index indicating, for example, the certainty (likelihood) that the article to be inspected is a specific article as a result of inspecting a transmission image with use of the model (model inspection). Possible examples of the specific article include socially improper articles (such articles as various types of prohibited items and restricted items), and hazardous materials in aviation. 
     The changing unit  12  changes the first certainty degree based on an inspection result that is obtained by conducting one or more inspections with respect to the article. 
     Examples of the inspections include an external package inspection, a weight inspection, a dimension inspection, an odor inspection, a texture inspection, a temperature inspection, and so on. The external package inspection is, for example, an inspection for estimating the place from which an article inside an external package was addressed (the place of departure), either manually or automatically, with use of the characteristics of the external package, such as the material of the external package enveloping the article, and the characters, pictures, and stamps on the external package. Note that no restriction is intended with regard to the foregoing characteristics, and characteristics other than the foregoing characteristics may be used. 
     The weight inspection is an inspection that measures the weight of an article or an external package enveloping the article with use of a weight sensor. The dimension inspection is an inspection that measures the dimension of an article or an external package enveloping the article based on an image captured by an image capturing apparatus, such as a camera. The odor inspection is an inspection that measures the odor of an article or an external package enveloping the article with use of an odor sensor. The texture inspection is an inspection that measures the texture of an article or an external package enveloping the article, either manually or automatically, with use of a pressure sensor and the like. The temperature inspection is an inspection that measures the temperature of an article or an external package enveloping the article with use of a temperature sensor, a thermal image camera, and the like. Also, the inspections may include an inspection that measures the number of articles. 
     In a case where the changed first certainty degree is equal to or higher than a pre-set first certainty degree threshold, the first determination unit  13  determines that the article is a specific article. 
     In the example embodiment, the first certainty degree indicating that an article is a specific article is changed using the results of one or more inspections that are different from the model inspection, and thus the accuracy of detection of a specific article can be improved. 
     [System Configuration] 
     Subsequently, the configuration of the inspection assistance apparatus  10  in the example embodiment will be described more specifically using  FIG.  2   .  FIG.  2    is a diagram for describing one example of a system that includes an inspection assistance apparatus. 
     As shown in  FIG.  2   , a system  20  in the example embodiment includes a transmission image generation apparatus  21 , an image capturing apparatus  22 , an input apparatus  23 , a sensor  24 , and an output apparatus  25 , in addition to the inspection assistance apparatus  10 . Also, the inspection assistance apparatus  10  in the example embodiment includes an obtainment unit  14 , a first threshold changing unit  15 , a first model selection unit  16 , a risk changing unit  17 , and an output information generation unit  18 , in addition to the first certainty degree output unit  11 , the changing unit  12 , and the first determination unit  13 . 
     The inspection assistance apparatus  10  is an apparatus that improves the accuracy of detection of a specific article with use of not only the output of a model inspection (the first certainty degree), but also one or more other inspection results. For instance, the inspection assistance apparatus  10  is an information processing apparatus such as a circuit and a computer provided with a programmable device (e.g., a programmable device such as a CPU (Central Processing Unit) and an FPGA (Field-Programmable Gate Array)), a GPU (Graphics Processing Unit), or one or more of these. Note that the inspection assistance apparatus  10  may be an information processing apparatus such as a server computer and a mobile terminal. 
     The transmission image generation apparatus  21  (e.g., an apparatus such as an X-ray imaging apparatus) is an apparatus that irradiates an externally-packaged article to be inspected with X-rays, measures the magnitude of the transmitted X-ray dose or reflection, and generates a transmission image with use of the result of measurement. Specifically, first, the transmission image generation apparatus  21  generates a transmission image by capturing an image of an externally-packaged article to be inspected at a predetermined position. Subsequently, the transmission image generation apparatus  21  transmits the generated transmission image to the obtainment unit  14 . Note that an apparatus that obtains a transmission image is not limited to an X-ray imaging apparatus; for example, a passive millimeter-wave imaging apparatus that uses millimeter waves may be used thereas. 
     The image capturing apparatus  22  captures an image of the article or the external package of the article to be inspected. Specifically, the image capturing apparatus  22 , which is a camera or the like, captures an image of the article or the external package of the article to be inspected at a predetermined position. Subsequently, the image capturing apparatus  22  outputs the generated image to the obtainment unit  14 . Note that this captured image is used in a dimension inspection and the like. 
     The input apparatus  23  is an apparatus that is intended for an inspector to input the result of the aforementioned inspection (inspection result) with respect to the article or the externally-packaged article to be inspected. Specifically, first, the inspector inputs the inspection result to the input apparatus  23  with use of user interfaces, such as a touchscreen, a keyboard, and a mouse. Subsequently, the inspection result input by the input apparatus  23  is transmitted to the obtainment unit  14 . 
     The sensor  24  is, for example, a sensor such as a weight sensor used in a weight inspection, an odor sensor used in an odor inspection, a pressure sensor used in a texture inspection, and a temperature sensor or a thermal image camera used in a temperature inspection. Note that the sensor  24  is not limited to the foregoing sensors. 
     The output apparatus  25  obtains output information that has been converted by the output information generation unit  18  into a format that can be output, and outputs generated images, sounds, and the like based on this output information. The output apparatus  25  is, for example, an image display apparatus or the like that uses liquid crystal, organic EL (Electro Luminescence), or a CRT (Cathode Ray Tube). Furthermore, the image display apparatus may include, for example, a sound output device, such as a speaker. Note that the output apparatus  25  may be a printing apparatus, such as a printer. Alternatively, the output apparatus  25  may be a rotating light or the like. 
     Below is a detailed description of the inspection assistance apparatus. 
     The obtainment unit  14  obtains the transmission image and the inspection result (the image obtained by capturing the article or the external package of the article, the inspection result input by the input apparatus  23 , the output result from the sensor  24  (various types of sensors), and so on). Subsequently, the obtainment unit  14  outputs the inspection result to the first threshold changing unit  15  and the first model selection unit  16 . The obtainment unit  14  outputs the transmission image to the first certainty degree output unit  11 . 
     The first certainty degree output unit  11  inputs the transmission image to a model, and obtains, from the model, a first certainty degree indicating that the article or the article inside the external package is a specific article. Specifically, first, the first certainty degree output unit  11  obtains the transmission image from the obtainment unit  14 . Subsequently, the first certainty degree output unit  11  inputs the obtained transmission image to a model. Subsequently, the first certainty degree output unit  11  obtains the first certainty degree output from the model. Subsequently, the first certainty degree output unit  11  outputs the first certainty degree to the changing unit  12  and the output information generation unit  18 . 
     A description is now given of a case where the items of specific articles are A to E, for example.  FIG.  3    is a diagram for describing the relationship between specific articles and certainty degrees. In the example of  FIG.  3   , in a case where there are models respectively for items A to E, for example, in a case where a model for item A is used, a first certainty degree “Conf_11” indicating item A is output. Note that a model that simultaneously outputs the first certainty degrees of respective items A to E may be used. In this case, the model outputs the first certainty degrees “Conf_11” to “Conf_15” corresponding to items A to E in connection with items A to E, respectively. 
     Note that a model that specifies the number of specific articles may be provided independently from the model that outputs the first certainty degree. 
     The changing unit  12  conducts one or more inspections that are different from the model inspection either manually or automatically, and changes the first certainty degree based on the obtained inspection result. Specifically, first, the changing unit  12  obtains the inspection result from the obtainment unit  14 . Subsequently, with use of the inspection result, the changing unit  12  refers to pre-set determination information, and derives a change value that is used to change the first certainty degree. Subsequently, the changing unit  12  changes the first certainty degree with use of the change value. Subsequently, the changing unit  12  stores the changed first certainty degree, and also outputs the changed first certainty degree to the output information generation unit  18 . 
     The determination information for changing the first certainty degree is information in which determination conditions are associated with change values.  FIG.  4    is a diagram for describing a data structure of the determination information. 
     For example, in a case where  FIG.  4    depicts determination information  41  for item A, the changing unit  12  selects a condition equivalent to the inspection result from “condition 1” to “condition 6” . . . under “determination conditions” shown in  FIG.  4   . Thereafter, the changing unit  12  selects a change value corresponding to the selected condition. For example, in a case where “condition 1” has been selected, the changing unit  12  selects “Chg_11” corresponding to “condition 1”. Subsequently, the changing unit  12  changes the first certainty degree with use of the selected change value. 
     For example, in a case where the name of country A (a country in which the use of a socially improper article is permitted) is described on the external package as a result of conducting an external package inspection with respect to item A, the changing unit  12  detects a condition equivalent to this inspection result. Thereafter, the changing unit  12  obtains a change value corresponding to the condition, and lowers the first certainty degree corresponding to item A based on the change value. In this way, the accuracy of detection of inclusion of a socially improper article is improved. 
     Also, in a case where the item described on the external package is different from the result of a model inspection as a result of conducting an external package inspection with respect to item B, the changing unit  12  detects a condition equivalent to this inspection result. Thereafter, the changing unit  12  obtains a change value corresponding to the condition, and lowers the first certainty degree corresponding to item B based on the change value. In this way, the accuracy of detection of inclusion of a socially improper article is improved. 
     Also, in a case where item C is wrapped in specific wrapping paper (wrapping paper of a socially improper article that was detected in the past) as a result of conducting an external package inspection with respect to item C, the changing unit  12  detects a condition equivalent to this inspection result. Thereafter, the changing unit  12  obtains a change value corresponding to the condition, and lowers the first certainty degree corresponding to item C based on the change value. In this way, the accuracy of detection of inclusion of a socially improper article is improved. 
     Also, in a case where a letter of a predetermined size has a weight of 200 g or more (e.g., in the case of a small postal item that is extremely heavy) as a result of conducting a weight inspection with respect to item D, the changing unit  12  detects a condition equivalent to this inspection result. Thereafter, the changing unit  12  obtains a change value corresponding to the condition, and lowers the certainty degree because there is a possibility of gold smuggling, thereby improving the accuracy of detection of inclusion of a socially improper article. 
     Also, in a case where a certain number or more of odorous materials have been detected as a result of conducting an odor inspection with respect to item A, the changing unit  12  detects a condition equivalent to this inspection result. Thereafter, the changing unit  12  obtains a change value corresponding to the condition, and lowers the first certainty degree corresponding to item A based on the change value. In this way, the accuracy of detection of inclusion of a socially improper article is improved. 
     Also, in a case where a particle has been detected after compressing item A as a result of conducting a texture inspection with respect to item A, the changing unit  12  detects a condition equivalent to this inspection result. Thereafter, the changing unit  12  obtains a change value corresponding to the condition, and lowers the first certainty degree corresponding to item A based on the change value. In this way, the accuracy of detection of inclusion of a socially improper article is improved. 
     Also, in a case where the temperature is 0° C. or lower (e.g., in a case where there is a high possibility that a drug is contained) as a result of conducting a temperature inspection with respect to item E, the changing unit  12  detects a condition equivalent to this inspection result. Thereafter, the changing unit  12  obtains a change value corresponding to the condition, and lowers the first certainty degree corresponding to item E based on the change value. In this way, the accuracy of detection of inclusion of a socially improper article is improved. 
     Also, in a case where the temperature is 25° C. or higher (e.g., in a case where there is a high possibility that an animal that is prohibited to be imported is contained) as a result of conducting a temperature inspection with respect to item E, the changing unit  12  detects a condition equivalent to this inspection result. Thereafter, the changing unit  12  obtains a change value corresponding to the condition, and lowers the first certainty degree corresponding to item E based on the change value. In this way, the accuracy of detection of inclusion of a socially improper article is improved. 
     Note that the changing unit  12  may use a second certainty degree as a change value, and change the first certainty degree in accordance with the second certainty degree. A second certainty degree output unit (not shown) calculates the second certainty degree based on an inspection result that is obtained by conducting one or more inspections with respect to an article. 
     For instance, the second certainty degree is an index indicating, for example, the certainty (likelihood) that the article to be inspected is a specific article in the aforementioned inspection result. Possible examples of the specific article include socially improper articles (such articles as various types of prohibited items and restricted items), and hazardous materials in aviation. 
     In a case where the first certainty degree is equal to or higher than the pre-set first certainty degree threshold, the first determination unit  13  determines that the article is a specific article. Specifically, first, the first determination unit  13  obtains the first certainty degree. Subsequently, with use of the obtained first certainty degree, the first determination unit  13  refers to threshold information, and determines whether the first certainty degree is equal to or higher than the first certainty degree threshold. Subsequently, in a case where the first certainty degree is equal to or higher than the first certainty degree threshold, the first determination unit  13  determines that the article on which the model inspection was conducted is a specific article. Subsequently, the first determination unit  13  outputs information indicating the detected specific article to the output information generation unit  18 . 
       FIG.  5    is a diagram for describing a data structure of the threshold information. In threshold information  51  shown in  FIG.  5   , certainty degree thresholds “Th_1” to Th_5” are associated with models A to E that are used respectively in the inspections of items A to E. 
     For example, in a case where an inspection has been conducted using a model that detects item A and the first certainty degree Conf_11 is equal to or higher than the certainty degree threshold Th_1, it means that the first determination unit  13  has detected item A. 
     The first threshold changing unit  15  changes the first certainty degree threshold in accordance with the inspection result. Specifically, the first threshold changing unit  15  first obtains the inspection result from the obtainment unit  14 . Subsequently, with use of the inspection result, the first threshold changing unit  15  refers to pre-set determination information for changing the first certainty degree threshold, and derives a change value that is used to change the first certainty degree threshold. Subsequently, the first threshold changing unit  15  changes the first certainty degree threshold with use of the change value. Subsequently, the first threshold changing unit  15  outputs the changed first certainty degree threshold to the output information generation unit  18 . 
     The determination information for changing the first certainty degree threshold is information in which determination conditions are associated with threshold change values.  FIG.  6    is a diagram for describing a data structure of the determination information. For example, in a case where  FIG.  6    depicts determination information  61  for item A, the first threshold changing unit  15  selects a condition equivalent to the inspection result from “condition 1” to “condition  6 ” . . . under “determination conditions” shown in  FIG.  6   . Thereafter, the first threshold changing unit  15  selects a change value corresponding to the selected condition. For example, in a case where “condition 1” has been selected, the changing unit  12  selects “Chg_21” corresponding to “condition 1”. Subsequently, the first threshold changing unit  15  changes the first certainty degree threshold with use of the selected change value. 
     In this way, the first certainty degree threshold is changed using the results of one or more inspections that are different from the model inspection; thus, the accuracy of detection of a specific article can be improved. 
     In a case where there are models respectively for a plurality of specific articles, the first model selection unit  16  selects a model in accordance with the inspection result. Specifically, first, the first model selection unit  16  obtains the inspection result from the obtainment unit  14 . Subsequently, with use of the inspection result, the first model selection unit  16  refers to pre-set model selection information, and selects a model to be used in the model inspection. 
     The model selection information is information in which model determination conditions are associated with models.  FIG.  7    is a diagram for describing a data structure of the model selection information. 
     For example, in the case of model selection information  71  shown in  FIG.  7   , the first model selection unit  16  selects a condition equivalent to the inspection result from “model condition 1” to “model condition 6” . . . under “model determination conditions” shown in  FIG.  7   . Thereafter, the first model selection unit  16  selects a model corresponding to the selected condition. For example, in a case where “model condition 1” has been selected, the first model selection unit  16  selects model “A” corresponding to “model condition 1”. Subsequently, with use of the selected model “A”, the first model selection unit  16  switches among models to be used in the model inspection. 
     By thus automatically switching among models to be used in the model inspection, the work efficiency of the inspector can be improved. 
     The risk changing unit  17  changes the risk associated with a specific article in accordance with the inspection result. The risk is an index indicating a degree of hazard of a specific article (the extent of the risk). For example, the risk may be denoted by two levels of “high” and “low”, or may be denoted by three or more levels. 
     Specifically, first, the risk changing unit  17  refers to pre-set risk information, and determines a risk corresponding to the model that is currently used.  FIG.  8    is a diagram for describing a data structure of the risk information. The risk information is information in which models are associated with risks. 
     For example, in a case where an article is a wine bottle, this article is determined to be at high risk if the wine bottle contains a hazardous material. 
     Also, the risk changing unit  17  obtains the inspection result from the obtainment unit  14 . Subsequently, in accordance with the inspection result, the risk changing unit  17  refers to pre-set determination information for changing the risk, and selects a risk change value that is used to change the risk. 
       FIG.  9    is a diagram for describing a data structure of the determination information. The determination information for changing the risk is information in which determination conditions are associated with risk change values. 
     For example, in a case where  FIG.  9    depicts determination information  91  for item A, the risk changing unit  17  selects a condition equivalent to the inspection result from “condition 1” to “condition 6” . . . under “determination conditions” shown in  FIG.  9   . Thereafter, the risk changing unit  17  selects a risk change value corresponding to the selected condition. For example, in a case where “condition 1” has been selected, the risk changing unit  17  selects “RChg_1” corresponding to “condition 1”. 
     Subsequently, the risk changing unit  17  changes the risk with use of the selected risk change value. Subsequently, the risk changing unit  17  outputs the changed risk to the output information generation unit  18 . 
     In the examples of  FIG.  8    and  FIG.  9   , in a case where model “A” has been selected, the risk changing unit  17  selects risk “R  1 ” corresponding to model “A”. Next, the risk changing unit  17  selects a risk change value based on the inspection result. In a case where “RChg_1” has been selected as a risk change value, the risk changing unit  17  changes risk “R_1” with use of risk change value “RChg_1”. 
     For example, in a case where the name of a country on a blacklist is described as a result of an external package inspection, the risk of the article is set to a risk that is higher than the current one. 
     Also, the risk changing unit  17  may include a risk determination unit. Note that the risk determination unit may be provided independently from the risk changing unit  17 . 
     The risk determination unit outputs risk management indexes of specific articles based on risks and pre-set risk conditions. A risk condition is, for example, information indicating the number of specific articles. A risk management index is, for example, an index (score) determined based on a risk and a risk condition. 
     For example, in a case where the risk of specific article A is “low” and one specific article A has been detected inside an external package as a result of the inspection, “1” is set as the extent of the risk. Also, in a case where the risk of specific article A is “low” and a plurality of specific articles A have been detected inside an external package as a result of the inspection, the extent of the risk becomes high compared to the case where the number of specific articles A is one, and thus “3” is set thereas, for example. 
     In a case where the risk of specific article B is “high” and one specific article B has been detected inside an external package as a result of the inspection, the risk of specific article B is high even though the number of specific article B is one, and thus “5” is set as the extent of the risk, for example. Also, in a case where the risk of the specific article is “high” and a plurality of specific articles B have been detected inside an external package as a result of the inspection, the extent of the risk becomes high compared to the risk of the case where the number of specific articles B is one, and thus “7” is set thereas, for example. 
     The output information generation unit  18  generates output information by converting the transmission image, the first certainty degree, the first certainty degree threshold, the risk, or information indicating one of these into a format that can be output from the output apparatus  25 , and transmits the output information to the output apparatus  25 . In a case where the output apparatus  25  is a rotating light, for example, the rotating light emits light and/or outputs a sound upon obtaining the output information. 
     [Apparatus Operations] 
     Next, the operations of the inspection assistance apparatus in the first example embodiment of the invention will be described using  FIG.  10   .  FIG.  10    is a diagram for describing one example of the operations of the inspection assistance apparatus. In the following description,  FIG.  1    to  FIG.  9    will be referred to as appropriate. Also, in the first example embodiment, the inspection assistance method is implemented by causing the inspection assistance apparatus to operate. Therefore, the following description of the operations of the inspection assistance apparatus applies to the inspection assistance method in the example embodiment. 
     As shown in  FIG.  10   , first, the obtainment unit  14  obtains a transmission image and an inspection result (an image obtained by capturing an article or an external package of the article, an inspection result input by the input apparatus  23 , an output result from the sensor  24  (various types of sensors), and the like) (step A 1 ). Subsequently, in step A 1 , the obtainment unit  14  outputs the inspection result to the first threshold changing unit  15  and the first model selection unit  16 . The obtainment unit  14  outputs the transmission image to the first certainty degree output unit  11 . 
     Next, in a case where there are models respectively for a plurality of specific articles, the first model selection unit  16  selects a model in accordance with the inspection result (step A 2 ). 
     Specifically, in step A 2 , first, the first model selection unit  16  obtains the inspection result from the obtainment unit  14 . Subsequently, in step A 2 , with use of the inspection result, the first model selection unit  16  refers to pre-set model selection information, and selects a model to be used in the model inspection. 
     Next, the first certainty degree output unit  11  inputs the transmission image to the model, and obtains, from the model, a first certainty degree indicating that the article or the article inside the external package is a specific article (step A 3 ). 
     Specifically, in step A 3 , first, the first certainty degree output unit  11  obtains the transmission image from the obtainment unit  14 . Subsequently, in step A 3 , the first certainty degree output unit  11  inputs the obtained transmission image to the model. Subsequently, in step A 3 , the first certainty degree output unit  11  obtains the first certainty degree output from the model. Subsequently, in step A 3 , the first certainty degree output unit  11  outputs the first certainty degree to the changing unit  12  and the output information generation unit  18 . 
     Next, the changing unit  12  conducts one or more inspections that are different from the model inspection either manually or automatically, and changes the first certainty degree based on the obtained inspection result (step A 4 ). 
     Specifically, in step A 4 , first, the changing unit  12  obtains the inspection result from the obtainment unit  14 . Subsequently, in step A 4 , with use of the inspection result, the changing unit  12  refers to pre-set determination information, and derives a change value that is used to change the first certainty degree. Subsequently, in step A 4 , the changing unit  12  changes the first certainty degree with use of the change value. Subsequently, in step A 4 , the changing unit  12  stores the changed first certainty degree, and also outputs the changed first certainty degree to the output information generation unit  18 . 
     Next, the first threshold changing unit  15  changes the first certainty degree threshold in accordance with the inspection result (step A 5 ). 
     Specifically, in step A 5 , first, the first threshold changing unit  15  obtains the inspection result from the obtainment unit  14 . Subsequently, in step A 5 , with use of the inspection result, the first threshold changing unit  15  refers to pre-set determination information for changing the first certainty degree threshold, and derives a change value that is used to change the first certainty degree threshold. Subsequently, in step A 5 , the first threshold changing unit  15  changes the first certainty degree threshold with use of the change value. Subsequently, in step A 5 , the first threshold changing unit  15  outputs the changed first certainty degree threshold to the output information generation unit  18 . 
     Note that no restriction is placed on the order of processing of steps A 4  and A 5 , and processing may be performed in the order of steps A 5  and A 4 . Furthermore, processing of one of steps A 4  and A 5  may be skipped. 
     Next, in a case where the first certainty degree is equal to or higher than the pre-set first certainty degree threshold, the first determination unit  13  determines that the article is a specific article (step A 6 ). 
     Specifically, in step A 6 , first, the first determination unit  13  obtains the first certainty degree. Subsequently, in step A 6 , with use of the obtained first certainty degree, the first determination unit  13  refers to threshold information, and determines whether the first certainty degree is equal to or higher than the first certainty degree threshold. Subsequently, in step A 6 , in a case where the first certainty degree is equal to or higher than the first certainty degree threshold, the first determination unit  13  determines that the article on which the model inspection was conducted is a specific article. Subsequently, in step A 6 , the first determination unit  13  outputs information indicating the detected specific article to the output information generation unit  18 . 
     Next, the risk changing unit  17  changes the risk associated with the specific article in accordance with the inspection result (step A 7 ). 
     Specifically, in step A 7 , first, the risk changing unit  17  refers to pre-set risk information, and obtains a risk corresponding to the model that is currently used. Also, in step A 7 , the risk changing unit  17  obtains the inspection result from the obtainment unit  14 . 
     Subsequently, in step A 7 , in accordance with the inspection result, the risk changing unit  17  refers to pre-set determination information for changing the risk, and selects a risk change value that is used to change the risk. Subsequently, in step A 7 , the risk changing unit  17  changes the risk with use of the risk change value. 
     Next, the output information generation unit  18  generates output information by converting the transmission image, the first certainty degree, the first certainty degree threshold, the risk, or information indicating one of these into a format that can be output from the output apparatus  25 , and transmits the output information to the output apparatus  25  (step A 8 ). In a case where the output apparatus  25  is a rotating light, for example, the rotating light emits light and/or outputs a sound upon obtaining the output information. 
     In this way, target articles are inspected by executing processing of the aforementioned steps A 1  to A 8  on a per-article basis. 
     [Effects of First Example Embodiment] 
     As described above, according to the first example embodiment, the first certainty degree indicating that an article is a specific article is changed using the results of one or more inspections that are different from the model inspection, and thus the accuracy of detection of a specific article can be improved. 
     [Program] 
     The program according to an embodiment 1 of the invention may be a program that causes a computer to execute steps A 1  to A 8  shown in  FIG.  10   . By installing this program in a computer and executing the program, the inspection assistance apparatus and the inspection assistance method according to the example embodiment can be realized. In this case, the processor of the computer performs processing to function as the obtainment unit  14 , the first model selection unit  16 , the first certainty degree output unit  11 , the changing unit  12 , the first threshold changing unit  15 , the first determination unit  13 , the risk changing unit  17 , and the output information generation unit  18 . 
     Also, the program according to the embodiment may be executed by a computer system constructed by a plurality of computers. In this case, for example, each computer may function as any of the obtainment unit  14 , the first model selection unit  16 , the first certainty degree output unit  11 , the changing unit  12 , the first threshold changing unit  15 , the first determination unit  13 , the risk changing unit  17 , and the output information generation unit  18 . 
     Second Example Embodiment 
     Below, a second example embodiment of the invention will be described with reference to the drawings. Note that in the drawings described below, the elements that have the same functions or corresponding functions are given the same reference sign, and a repetitive description thereof may be omitted. 
     [Apparatus Configuration] 
     The configuration of an inspection assistance apparatus  100  in the example embodiment is now described using  FIG.  11   .  FIG.  11    is a diagram for describing one example of the inspection assistance apparatus. 
     The inspection assistance apparatus  100  shown in  FIG.  11    is an apparatus that improves the accuracy of detection of a specific article. Also, as shown in  FIG.  11   , the inspection assistance apparatus  100  includes a third certainty degree output unit  101  and a second determination unit  102 . 
     Among these, the third certainty degree output unit  101  inputs, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article, and outputs a third certainty degree indicating that the article is a specific article. 
     The model is a model that has been generated using AI, such as deep learning. The model is, for example, generated through machine learning by inputting a large amount of transmission images and inspection results as a data set in a learning phase. The model is stored in a storage device provided inside the inspection assistance apparatus  100 , or in a storage apparatus provided independently from the inspection assistance apparatus  100 . 
     For instance, the third certainty degree is an index indicating, for example, the certainty (likelihood) that the transmission image includes a specific article. 
     In a case where the third certainty degree is equal to or higher than a pre-set third certainty degree threshold, the second determination unit  102  determines that the article is a specific article. 
     In the example embodiment, machine learning is performed with a transmission image and an inspection result input to a model, and thus the accuracy of detection of a specific article can be improved. 
     [System Configuration] 
     Subsequently, the configuration of the inspection assistance apparatus  100  in the example embodiment will be described more specifically using  FIG.  12   .  FIG.  12    is a diagram for describing one example of a system that includes an inspection assistance apparatus. 
     As shown in  FIG.  12   , a system  110  in the example embodiment includes a transmission image generation apparatus  21 , an image capturing apparatus  22 , an input apparatus  23 , a sensor  24 , and an output apparatus  25 , in addition to the inspection assistance apparatus  100 . Also, the inspection assistance apparatus  100  in the example embodiment includes an obtainment unit  103 , a second threshold changing unit  104 , a second model selection unit  105 , a risk changing unit  17 , and an output information generation unit  18 , in addition to the third certainty degree output unit  101  and the second determination unit  102 . 
     The inspection assistance apparatus  100  is an apparatus that improves the accuracy of the output of a model (the third certainty degree) by using a model that has been generated through machine learning as a result of inputting a transmission image and an inspection result. Therefore, the accuracy of detection of a specific article is also improved. For instance, the inspection assistance apparatus  100  is an information processing apparatus such as a circuit and a computer provided with, for example, a CPU, a programmable device such as an FPGA, a GPU, or one or more of these. Note that the inspection assistance apparatus  100  may be an information processing apparatus such as a server computer and a mobile terminal. 
     Note that the descriptions of the transmission image generation apparatus  21 , the image capturing apparatus  22 , the input apparatus  23 , the sensor  24 , and the output apparatus  25  are omitted as they were provided in the first example embodiment. 
     Below is a detailed description of the inspection assistance apparatus. 
     The obtainment unit  103  obtains a transmission image and an inspection result. Subsequently, the obtainment unit  103  outputs the inspection result to the second threshold changing unit  104  and the second model selection unit  105 . The transmission image and the inspection result are output to the third certainty degree output unit  101 . 
     The third certainty degree output unit  101  inputs the transmission image and the inspection result to the model, and obtains, from the model, the third certainty degree indicating that an article, or an article inside an external package, is a specific article. Specifically, first, the third certainty degree output unit  101  obtains the transmission image and the inspection result from the obtainment unit  103 . Subsequently, the third certainty degree output unit  101  inputs the obtained transmission image and inspection result to the model. Subsequently, the third certainty degree output unit  101  obtains the third certainty degree output from the model. Subsequently, the third certainty degree output unit  101  outputs the third certainty degree to the second determination unit  102  and the output information generation unit  18 . 
     A description is now given of a case where the items of specific articles are A to E, for example. In the second example embodiment, in a case where a model for item A is used, a third certainty degree indicating item A is output. Note that a model that simultaneously outputs the third certainty degrees of respective items A to E may be used. 
     In a case where the third certainty degree is equal to or higher than the pre-set third certainty degree threshold, the second determination unit  102  determines that the article is a specific article. Specifically, first, the second determination unit  102  obtains the third certainty degree. Subsequently, with use of the obtained third certainty degree, the second determination unit  102  refers to threshold information, and determines whether the third certainty degree is equal to or higher than the third certainty degree threshold. Subsequently, in a case where the third certainty degree is equal to or higher than the third certainty degree threshold, the second determination unit  102  determines that the article on which the model inspection was conducted is a specific article. Subsequently, the second determination unit  102  outputs information indicating the detected specific article to the output information generation unit  18 . 
     For example, in a case where the third certainty degree output from the model for detecting item A is equal to or higher than a second certainty degree threshold, it means that the second determination unit  102  has detected item A. 
     The second threshold changing unit  104  changes the third certainty degree threshold in accordance with the inspection result. Specifically, first, the second threshold changing unit  104  obtains the inspection result from the obtainment unit  103 . Subsequently, with use of the inspection result, the second threshold changing unit  104  refers to pre-set determination information for changing the third certainty degree threshold, and derives a change value that is used to change the third certainty degree threshold. Subsequently, the second threshold changing unit  104  changes the third certainty degree threshold with use of the change value. Subsequently, the second threshold changing unit  104  outputs the changed third certainty degree threshold to the output information generation unit  18 . 
     In a case where there are models respectively for a plurality of specific articles, the second model selection unit  105  selects a model in accordance with the inspection result. Specifically, first, the second model selection unit  105  obtains the inspection result from the obtainment unit  103 . Subsequently, with use of the inspection result, the second model selection unit  105  refers to pre-set model selection information, and selects a model to be used in the model inspection. 
     Note that the description of the risk changing unit  17  is omitted as it was provided in the first example embodiment. 
     The output information generation unit  18  generates output information by converting the transmission image, the third certainty degree, the third certainty degree threshold, the risk, or information indicating one of these into a format that can be output from the output apparatus  25 , and transmits the output information to the output apparatus  25 . 
     [Apparatus Operations] 
     Next, the operations of the inspection assistance apparatus in the second example embodiment of the invention will be described using  FIG.  13   .  FIG.  13    is a diagram for describing one example the operations of the inspection assistance apparatus. In the following description,  FIG.  11    and  FIG.  12    will be referred to as appropriate. Also, in the second example embodiment, the inspection assistance method is implemented by causing the inspection assistance apparatus to operate. Therefore, the following description of the operations of the inspection assistance apparatus applies to the inspection assistance method in the example embodiment. 
     As shown in  FIG.  13   , first, the obtainment unit  103  obtains a transmission image and an inspection result (step B 1 ). Subsequently, in step B 1 , the obtainment unit  103  outputs the inspection result to the second threshold changing unit  104  and the second model selection unit  105 . The obtainment unit  103  outputs the transmission image and the inspection result to the third certainty degree output unit  101 . 
     Next, in a case where there are models respectively for a plurality of specific articles, the second model selection unit  105  selects a model in accordance with the inspection result (step B 2 ). 
     Specifically, in step B 2 , first, the second model selection unit  105  obtains the inspection result from the obtainment unit  103 . Subsequently, in step B 2 , with use of the inspection result, the second model selection unit  105  refers to pre-set model selection information, and selects a model to be used in the model inspection. 
     Next, the third certainty degree output unit  101  inputs the transmission image and the inspection result to the model, and obtains, from the model, the third certainty degree indicating that an article, or an article inside an external package, is a specific article (step B 3 ). 
     Specifically, in step B 3 , first, the third certainty degree output unit  101  obtains the transmission image and the inspection result from the obtainment unit  103 . Subsequently, in step B 3 , the third certainty degree output unit  101  inputs the obtained transmission image and inspection result to the model. Subsequently, in step B 3 , the third certainty degree output unit  101  obtains the third certainty degree output from the model. Subsequently, in step B 3 , the third certainty degree output unit  101  outputs the third certainty degree to the second determination unit  102  and the output information generation unit  18 . 
     Next, the second threshold changing unit  104  changes the third certainty degree threshold in accordance with the inspection result (step B 4 ). Specifically, in step B 4 , first, the second threshold changing unit  104  obtains the inspection result from the obtainment unit  103 . Subsequently, in step B 4 , with use of the inspection result, the second threshold changing unit  104  refers to pre-set determination information for changing the third certainty degree threshold, and derives a change value that is used to change the third certainty degree threshold. Subsequently, in step B 4 , the second threshold changing unit  104  changes the third certainty degree threshold with use of the change value. Subsequently, in step B 4 , the second threshold changing unit  104  outputs the changed third certainty degree threshold to the output information generation unit  18 . Note that processing of step B 4  may be skipped. 
     Next, in a case where the third certainty degree is equal to or higher than the pre-set third certainty degree threshold, the second determination unit  102  determines that the article is a specific article (step B 5 ). 
     Specifically, in step B 5 , first, the second determination unit  102  obtains the third certainty degree. Subsequently, in step B 5 , with use of the obtained third certainty degree, the second determination unit  102  refers to threshold information, and determines whether the third certainty degree is equal to or higher than the third certainty degree threshold. Subsequently, in step B 5 , in a case where the third certainty degree is equal to or higher than the third certainty degree threshold, the second determination unit  102  determines that the article on which the model inspection was conducted is a specific article. Subsequently, in step B 5 , the second determination unit  102  outputs information indicating the detected specific article to the output information generation unit  18 . 
     Next, the risk changing unit  17  changes the risk associated with the specific article in accordance with the inspection result (step B 6 ). 
     Specifically, in step B 6 , first, the risk changing unit  17  refers to pre-set risk information, and obtains a risk corresponding to the model that is currently used. Also, in step B 6 , the risk changing unit  17  obtains the inspection result from the obtainment unit  103 . 
     Subsequently, in step B 6 , in accordance with the inspection result, the risk changing unit  17  refers to pre-set determination information for changing the risk, and selects a risk change value that is used to change the risk. Subsequently, in step B 6 , the risk changing unit  17  changes the risk with use of the risk change value. 
     Next, the output information generation unit  18  generates output information by converting the transmission image, the third certainty degree, the third certainty degree threshold, the risk, or information indicating one of these into a format that can be output from the output apparatus  25 , and transmits the output information to the output apparatus  25  (step B 7 ). In a case where the output apparatus  25  is a rotating light, for example, the rotating light emits light and/or outputs a sound upon obtaining the output information. 
     [Effects of Second Example Embodiment] 
     As described above, according to the example embodiment, machine learning is performed with a transmission image and an inspection result input to a model, and thus the accuracy of detection of a specific article can be improved. 
     [Program] 
     The program according to an embodiment of the invention may be a program that causes a computer to execute steps B 1  to B 7  shown in  FIG.  13   . By installing this program in a computer and executing the program, the inspection assistance apparatus and the inspection assistance method according to the example embodiment can be realized. In this case, the processor of the computer performs processing to function as the obtainment unit  103 , the second model selection unit  105 , the third certainty degree output unit  101 , the second threshold changing unit  104 , the second determination unit  102 , the risk changing unit  17 , and the output information generation unit  18 . 
     Also, the program according to the embodiment may be executed by a computer system constructed by a plurality of computers. In this case, for example, each computer may function as any of the obtainment unit  103 , the second model selection unit  105 , the third certainty degree output unit  101 , the second threshold changing unit  104 , the second determination unit  102 , the risk changing unit  17 , and the output information generation unit  18 . 
     [Physical Configuration] 
     Here, a computer that realizes an inspection assistance apparatus by executing the program according to an example embodiment 1 and 2 will be described with reference to  FIG.  14   .  FIG.  14    is a block diagram showing an example of a computer that realizes the inspection assistance apparatus according to an example embodiment 1 and 2 of the invention. 
     As shown in  FIG.  14   , a computer  110  includes a CPU  111 , a main memory  112 , a storage device  113 , an input interface  114 , a display controller  115 , a data reader/writer  116 , and a communications interface  117 . These units are each connected so as to be capable of performing data communications with each other through a bus  121 . Note that the computer  110  may include a GPU or an FPGA in addition to the CPU  111  or in place of the CPU  111 . 
     The CPU  111  opens the program (code) according to this example embodiment, which has been stored in the storage device  113 , in the main memory  112  and performs various operations by executing the program in a predetermined order. The main memory  112  is typically a volatile storage device such as a DRAM (Dynamic Random Access Memory). Also, the program according to this example embodiment is provided in a state being stored in a computer-readable recording medium  120 . Note that the program according to this example embodiment may be distributed on the Internet, which is connected through the communications interface  117 . Note that the recording medium  120  is a non-volatile recording medium. 
     Also, other than a hard disk drive, a semiconductor storage device such as a flash memory can be given as a specific example of the storage device  113 . The input interface  114  mediates data transmission between the CPU  111  and an input device  118 , which may be a keyboard or mouse. The display controller  115  is connected to a display device  119 , and controls display on the display device  119 . 
     The data reader/writer  116  mediates data transmission between the CPU  111  and the recording medium  120 , and executes reading of a program from the recording medium  120  and writing of processing results in the computer  110  to the recording medium  120 . The communications interface  117  mediates data transmission between the CPU  111  and other computers. 
     Also, general-purpose semiconductor storage devices such as CF (Compact Flash (registered trademark)) and SD (Secure Digital), a magnetic recording medium such as a Flexible Disk, or an optical recording medium such as a CD-ROM (Compact Disk Read-Only Memory) can be given as specific examples of the recording medium  120 . 
     [Supplementary Notes] 
     Furthermore, the following supplementary notes are disclosed regarding the example embodiments described above. Some portion or all of the example embodiments described above can be realized according to (supplementary note 1) to (supplementary note 51) described below, but the below description does not limit the invention. 
     (Supplementary Note 1) 
     An inspection assistance apparatus, comprising: 
     a first certainty degree output unit configured to input, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and output a first certainty degree indicating that the article is a specific article; and 
     a first determination unit configured to determine that the article is the specific article in a case where the first certainty degree that has been changed based on an inspection result is equal to or higher than a pre-set first certainty degree threshold, the inspection result being obtained by conducting one or more inspections with respect to the article. 
     (Supplementary Note 2) 
     The inspection assistance apparatus according to supplementary note 1, further comprising: 
     a second certainty degree output unit configured to determine calculate a second certainty degree based on the inspection result that is obtained by conducting one or more inspections with respect to the article; and 
     a changing unit configured to change the first certainty degree in accordance with the second certainty degree. 
     (Supplementary Note 3) 
     The inspection assistance apparatus according to supplementary note 2, further comprising: 
     a first threshold changing unit configured to change the first certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 4) 
     The inspection assistance apparatus according to any one of supplementary notes 1 to 3, further comprising: 
     a first model selection unit configured to select a model in accordance with the inspection result in a case where there are models respectively for a plurality of specific articles. 
     (Supplementary Note 5) 
     An inspection assistance apparatus, comprising: 
     a third certainty degree output unit configured to input, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article, and outputting a third certainty degree indicating that the article is a specific article; and 
     a second determination unit configured to determine that the article is a specific article in a case where the third certainty degree is equal to or higher than a pre-set third certainty degree threshold. 
     (Supplementary Note 6) 
     The inspection assistance apparatus according to supplementary note 5, further comprising: 
     a second threshold changing unit configured to change the third certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 7) 
     The inspection assistance apparatus according to supplementary note 5 or 6, further comprising: 
     a second model selection unit configured to select a model in accordance with the inspection result in a case where there are models respectively for a plurality of specific articles. 
     (Supplementary Note 8) 
     The inspection assistance apparatus according to any one of supplementary notes 5 to 7, further comprising: 
     a risk determination unit configured to determine an extent of a risk associated with the specific article. 
     (Supplementary Note 9) 
     The inspection assistance apparatus according to supplementary note 8, wherein in a case where the extent of the risk falls under a pre-set risk condition, the risk determination unit determines a magnitude of the risk of the article. 
     (Supplementary Note 10) 
     An inspection assistance method, comprising: 
     a first certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and outputting a first certainty degree indicating that the article is a specific article; and 
     a first determination step of determining that the article is the specific article in a case where the first certainty degree that has been changed based on an inspection result is equal to or higher than a pre-set first certainty degree threshold, the inspection result being obtained by conducting one or more inspections with respect to the article. 
     (Supplementary Note 11) 
     The inspection assistance method according to supplementary note 10, further comprising: 
     a second certainty degree output step of calculating a second certainty degree based on the inspection result that is obtained by conducting one or more inspections with respect to the article; and 
     a changing step of changing the first certainty degree in accordance with the second certainty degree. 
     (Supplementary Note 12) 
     The inspection assistance method according to supplementary note 11, further comprising: 
     a first threshold changing step of changing the first certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 13) 
     The inspection assistance method according to any one of supplementary notes 10 to 12, further comprising: 
     a first model selection step of selecting a model in accordance with the inspection result in a case where there are models respectively for a plurality of specific articles. 
     (Supplementary Note 14) 
     An inspection assistance method, comprising: 
     a third certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article, and outputting a third certainty degree indicating that the article is a specific article; and 
     a second determination step of determining that the article is a specific article in a case where the third certainty degree is equal to or higher than a pre-set third certainty degree threshold. 
     (Supplementary Note 15) 
     The inspection assistance method according to supplementary note 14, further comprising: 
     a second threshold changing step of changing the third certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 16) 
     The inspection assistance method according to supplementary note 14 or 15, further comprising: 
     a second model selection step of selecting a model in accordance with the inspection result in a case where there are models respectively for a plurality of specific articles. 
     (Supplementary Note 17) 
     The inspection assistance method according to any one of supplementary notes 14 to 16, further comprising: 
     a risk determination step of determining an extent of a risk associated with the specific article. 
     (Supplementary Note 18) 
     The inspection assistance method according to supplementary note 17, wherein in a case where the extent of the risk falls under a pre-set risk condition, the risk determination step determines a magnitude of the risk of the article. 
     (Supplementary Note 19) 
     A computer readable recording medium that includes a program recorded thereon, the program including instructions that cause a computer to carry out: 
     a first certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and outputting a first certainty degree indicating that the article is a specific article; and 
     a first determination step of determining that the article is the specific article in a case where the first certainty degree that has been changed based on an inspection result is equal to or higher than a pre-set first certainty degree threshold, the inspection result being obtained by conducting one or more inspections with respect to the article. 
     (Supplementary Note 20) 
     The computer readable recording medium according to Supplementary Note 19, wherein 
     a second certainty degree output step of calculating a second certainty degree based on the inspection result that is obtained by conducting one or more inspections with respect to the article; and 
     a changing step of changing the first certainty degree in accordance with the second certainty degree. 
     (Supplementary Note 21) 
     The computer readable recording medium according to Supplementary Note 20, wherein 
     a first threshold changing step of changing the first certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 22) 
     The computer readable recording medium according to any one of supplementary notes 19 to 21, wherein 
     a first model selection step of selecting a model in accordance with the inspection result in a case where there are models respectively for a plurality of specific articles. 
     (Supplementary Note 23) 
     A computer readable recording medium that includes a program recorded thereon, the program including instructions that cause a computer to carry out: 
     a third certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article, and outputting a third certainty degree indicating that the article is a specific article; and a second determination step of determining that the article is a specific article in a case where the third certainty degree is equal to or higher than a pre-set third certainty degree threshold. 
     (Supplementary Note 24) 
     The computer readable recording medium according to Supplementary Note 23, wherein 
     a second threshold changing step of changing the third certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 25) 
     The computer readable recording medium according to Supplementary Note 23 or 24, wherein 
     a second model selection step of selecting a model in accordance with the inspection result in a case where there are models respectively for a plurality of specific articles. 
     (Supplementary Note 26) 
     The computer readable recording medium according to any one of supplementary notes 23 to 25, wherein 
     a risk determination step of determining an extent of a risk associated with the specific article. 
     (Supplementary Note 27) 
     The computer readable recording medium according to Supplementary Note 26, wherein 
     in a case where the extent of the risk falls under a pre-set risk condition, the risk determination step determines a magnitude of the risk of the article. 
     (Supplementary Note 28) 
     An inspection assistance apparatus, including: 
     a first certainty degree output unit configured to input, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and output a first certainty degree indicating that the article is a specific article; 
     a changing unit configured to change the first certainty degree based on an inspection result that is obtained by conducting one or more inspections with respect to the article; and 
     a first determination unit configured to determine that the article is the specific article in a case where the changed first certainty degree is equal to or higher than a pre-set first certainty degree threshold. 
     (Supplementary Note 29) 
     The inspection assistance apparatus according to Supplementary Note 28, further including: 
     a first threshold changing unit configured to change the first certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 30) 
     The inspection assistance apparatus according to Supplementary Note 28 or 29, further including: 
     a first model selection unit configured to select a model in accordance with the inspection result in a case where there are a plurality of models. 
     (Supplementary Note 31) 
     An inspection assistance apparatus, including: 
     a second certainty degree output unit configured to input, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article, and output a second certainty degree indicating that the article is a specific article; and 
     a second determination unit configured to determine that the article is a specific article in a case where the second certainty degree is equal to or higher than a pre-set second certainty degree threshold. 
     (Supplementary Note 32) 
     The inspection assistance apparatus according to Supplementary Note 31, further including: 
     a second threshold changing unit configured to change the second certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 33) 
     The inspection assistance apparatus according to Supplementary Note 31 or 32, further including: 
     a second model selection unit configured to select a model in accordance with the inspection result in a case where there are a plurality of models. 
     (Supplementary Note 34) 
     An inspection assistance method, including: 
     a first certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and outputting a first certainty degree indicating that the article is a specific article; 
     a changing step of changing the first certainty degree based on an inspection result that is obtained by conducting one or more inspections with respect to the article; and 
     a first determination step of determining that the article is the specific article in a case where the changed first certainty degree is equal to or higher than a pre-set first certainty degree threshold. 
     (Supplementary Note 35) 
     The inspection assistance method according to Supplementary Note 34, further including: 
     a first threshold changing step of changing the first certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 36) 
     The inspection assistance method according to Supplementary Note 34 or 35, further including: 
     a first model selection step of selecting a model in accordance with the inspection result in a case where there are a plurality of models. 
     (Supplementary Note 37) 
     An inspection assistance method, including: 
     a second certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article, and outputting a second certainty degree indicating that the article is a specific article; and 
     a second determination step of determining that the article is a specific article in a case where the second certainty degree is equal to or higher than a pre-set second certainty degree threshold. 
     (Supplementary Note 38) 
     The inspection assistance method according to Supplementary Note 37, further including: 
     (c) a second threshold changing step of changing the second certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 39) 
     The inspection assistance method according to Supplementary Note 37 or 38, further including: 
     a second model selection step of selecting a model in accordance with the inspection result in a case where there are a plurality of models. 
     (Supplementary Note 40) 
     A computer readable recording medium that includes a program recorded thereon, the program including instructions that cause a computer to carry out: 
     a first certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves, and outputting a first certainty degree indicating that the article is a specific article; 
     a changing step of changing the first certainty degree based on an inspection result that is obtained by conducting one or more inspections with respect to the article; and 
     a first determination step of determining that the article is the specific article in a case where the changed first certainty degree is equal to or higher than a pre-set first certainty degree threshold. 
     (Supplementary Note 41) 
     The computer readable recording medium according to Supplementary Note 40, wherein 
     the program further includes instructions that cause the computer to carry out: 
     a first threshold changing step of changing the first certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 42) 
     The computer readable recording medium according to Supplementary Note 40 or 41, wherein 
     the program further includes instructions that cause the computer to carry out: 
     a first model selection step of selecting a model in accordance with the inspection result in a case where there are a plurality of models. 
     (Supplementary Note 43) 
     A computer readable recording medium that includes a program recorded thereon, the program including instructions that cause a computer to carry out: 
     a second certainty degree output step of inputting, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article, and outputting a second certainty degree indicating that the article is a specific article; and 
     a second determination step of determining that the article is a specific article in a case where the second certainty degree is equal to or higher than a pre-set second certainty degree threshold. 
     (Supplementary Note 44) 
     The computer readable recording medium according to Supplementary Note 43, wherein the program further includes instructions that cause the computer to carry out: 
     a second threshold changing step of changing the second certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 45) 
     The computer readable recording medium according to Supplementary Note 43 or 44, wherein 
     the program further includes instructions that cause the computer to carry out: 
     a second model selection step of selecting a model in accordance with the inspection result in a case where there are a plurality of models. 
     (Supplementary Note 46) 
     An inspection assistance system, including: 
     a transmission image generation apparatus that generates a transmission image by irradiating an article to be inspected with electromagnetic waves; and 
     a computer that inspects the article, wherein 
     the computer includes 
     a first certainty degree output unit configured to input the transmission image to a model, and output a first certainty degree indicating that the article is a specific article, 
     a changing unit configured to change the first certainty degree based on an inspection result that is obtained by conducting one or more inspections with respect to the article; and 
     a first determination unit configured to determine that the article is the specific article in a case where the changed first certainty degree is equal to or higher than a pre-set first certainty degree threshold. 
     (Supplementary Note 47) 
     The inspection assistance system according to Supplementary Note 46, further including: 
     a first threshold changing unit configured to change the first certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 48) 
     The inspection assistance system according to Supplementary Note 46 or 47, further including: 
     a first model selection unit configured to select a model in accordance with the inspection result in a case where there are a plurality of models. 
     (Supplementary Note 49) 
     An inspection assistance system, including: 
     a transmission image generation apparatus that generates a transmission image by irradiating an article to be inspected with electromagnetic waves; and 
     a computer that inspects the article, wherein 
     the computer includes 
     a second certainty degree output unit configured to input, to a model, a transmission image obtained by irradiating an article to be inspected with electromagnetic waves as well as an inspection result obtained by conducting one or more inspections with respect to the article, and output a second certainty degree indicating that the article is a specific article; and 
     a second determination unit configured to determine that the article is a specific article in a case where the second certainty degree is equal to or higher than a pre-set second certainty degree threshold. 
     (Supplementary Note 50) 
     The inspection assistance system according to Supplementary Note 49, further including: a second threshold changing unit configured to change the second certainty degree threshold in accordance with the inspection result. 
     (Supplementary Note 51) 
     The inspection assistance system according to Supplementary Note 49 or 50, further including: 
     a second model selection unit configured to select a model in accordance with the inspection result in a case where there are a plurality of models. 
     Although the invention of this application has been described with reference to exemplary embodiments, the invention of this application is not limited to the above exemplary embodiments. Within the scope of the invention of this application, various changes that can be understood by those skilled in the art can be made to the configuration and details of the invention of this application. 
     This application is based upon and claims the benefit of priority from Japanese application No. 2020-027543, filed on Feb. 20, 2020, the disclosure of which is incorporated herein in its entirety by reference. 
     Although the invention of this application has been described with reference to exemplary embodiments, the invention of this application is not limited to the above exemplary embodiments. Within the scope of the invention of this application, various changes that can be understood by those skilled in the art can be made to the configuration and details of the invention of this application. 
     INDUSTRIAL APPLICABILITY 
     As described above, according to the invention, it is possible to improve the accuracy of detection of a specific article. The invention is useful in fields where it is necessary to conduct the model inspection using a transmission image. 
     LIST OF REFERENCE SIGNS 
       10 ,  100  Inspection assistance apparatus 
       11  First certainty degree output unit 
       12  Changing unit 
       13  First determination unit 
       14 ,  103  Obtainment unit 
       15  First threshold changing unit 
       16  First model selection unit 
       17  Risk changing unit 
       18  Output information generation unit 
       20 ,  110  System 
       21  Transmission image generation apparatus 
       22  Image capturing apparatus 
       23  Input apparatus 
       24  Sensor 
       25  Output apparatus 
       101  Third certainty degree output unit 
       102  Second determination unit 
       104  Second threshold changing unit 
       105  Second model selection unit 
       110  Computer 
       111  CPU 
       112  Main memory 
       113  Storage device 
       114  Input interface 
       115  Display controller 
       116  Data reader/writer 
       117  Communication interface 
       118  Input device 
       119  Display device 
       120  Recording medium 
       121  Bus