Abstract:
An image information processing apparatus which includes an image reading section which reads an image of a document and outputs image data, a document judging section which judges whether the read document is an original document or a reproduced document according to whether or not specific data is present in the image data, an inquiry section for visualizing inquiry data related to the original document into a visible image, and a control section which controls the inquiry section to visualize the inquiry data designated by the specific data into visible image when the read document is judged to be a reproduced document by the document judging section.

Description:
This application is a continuation, of application Ser. No. 08/169,523, filed Dec. 17, 1993 now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     FIELD OF THE INVENTION 
     The present invention generally relates to image information processing, and more particularly, to a novel image information processing apparatus suitable for reproduction of hard copy images. 
     Copying equipment of the electrophotographic type has been widely employed in many fields of businesses and personal uses, since such equipment is capable of readily copying various documents at the location and at the number required. 
     Meanwhile, along with improvements in the performance of the copying equipment, the development of additional functions therefor has been continuously achieved, and a variety of such additional functions have already been placed into actual applications. 
     By way of example, there has been proposed a copying apparatus provided with a memory mode copy function in which, by storing the last read image formation in a semiconductor memory, processing at a higher speed is intended by omitting reading of a document in recopying, or provided with a communication function for notifying conditions of use or necessity of maintenance, etc. to external managing apparatus. 
     Moreover, in order to prevent secret information from being released, there is also proposed a print control practice in which outflow route search information such as date of copying, copying apparatus number, and the like is formed into codes to be padded into the copied images so as not to be recognized by the naked eye. 
     Incidentally, documents subjected to copying by copying equipment are broadly divided into original documents and reproduced documents obtained by the copying thereof Here, the word “original document” means an original text for the management of documents by a user of the copying apparatus. Normally, such original documents include documents prepared not by the copying apparatus, such as various printed matters including books, printed items by a printer, or hand-written documents, etc. However, there may be cases where documents prepared by other copying apparatus are used as the original documents. 
     In general offices, circulation or distribution of copied items by a copying apparatus is frequently carried out, and there are many cases where copied items are further made from the copied items (i.e., the cases where copying of the reproduced document is effected). The reproduced item from the original document (a primary reproduced item) is referred to as a “child” copy, and a reproduced item from the child copy (a secondary reproduced item) is called a “grandchild” copy. 
     In such a case as noted above, although the image reproducibility in the electrophotographic process is high, the image quality is gradually deteriorated as the reproduction is repeated, and the image quality of the “grandchild” copy tends to be slightly inferior to that of the “child” copy. 
     Therefore, there are often cases where it is desired to obtain a “child” copy with a favorable image quality by using the original document instead of the reproduced document when the document available at hand is of the reproduced document. 
     Apart from the problems related to the image quality, in the case where, for example, the document at hand is of a reproduced document copied from part of a book, it is sometimes desired to know the content of pages before and after the page at hand, i.e., the content in the pages not available at hand. 
     Moreover, when the document at hand is of a reproduced document prepared by amending part of the original document, there have occurred many cases where it is desired to know the content of the amended portion. 
     However, in the conventional practice, there have been such problems that the place where the original document is kept (or person keeping the original document) can not be easily found, and thus, the work for searching the original document is troublesome, or that it is impossible to obtain the “child” copy in the case where the original document has already been discarded. 
     SUMMARY OF THE INVENTION 
     Accordingly, an essential object of the present invention is to provide an image information processing apparatus in which, in a reproduction of a document by a copying apparatus, it is intended to readily obtain a reproduced item which is based on the original document. 
     Another object of the present invention is to provide an image information processing apparatus of the above described type, which is simple in construction, functionally stable and with a high reliability. 
     In accomplishing these and other objects, according to one aspect of the present invention, there is provided an image information processing apparatus which includes an image reading means which reads an image of a document and outputs image data, a document judging means which judges whether the read document is an original document or a reproduced document according to whether or not specific data is present in the image data, an inquiry means for visualizing inquiry data related to the original document into a visible image, the inquiry data comprising bibliographic data about the original document, and a control means which controls the inquiry means to visualize the inquiry data designated by the specific data into a visible image, when the read document is judged to be a reproduced document by said document judging means. 
     In another aspect of the present invention, the image information processing apparatus includes an input means for inputting inquiry data related to the original document, said inquiry data comprising bibliographic data about the original document a data forming means for producing specific data designating the inquiry data, an image information reading means which reads an image of a document and outputs image data, a document judging means which judges whether the read document is an original document or a reproduced document according to whether or not specific data is present in the image data, a composing means for preparing composed data based on the image data and the specific data, an image forming means for forming an image on a recording medium based on the composed data, and a control means which controls said composing means to prepare composed data based on the specific data and image data prepared by the data forming means, thereby to execute the image formation by said image forming means based on said composed data, when the read document is judged to be the original document by said document judging means. 
     In a further aspect of the present invention, the image information processing apparatus includes an image reading means which reads an image of a document and outputs image data, a document judging means which judges whether the read document is an original document or a reproduced document according to whether or not specific data is present in the image data, a memory means which preliminarily stores the image data of the original document, an image forming means for forming an image on a recording medium based on the image data, and a control means which controls said image forming means to execute image formation based on the image data stored in said memory, a reproduced document by the document judging means. 
     In a still further aspect of the present invention, the image information processing apparatus includes an image reading means which reads an image of a document and outputs image data, a memory means which preliminarily stores predetermined image data, an image judging means for judging whether or not the image data of the read document is the same data as the stored predetermined image data, an image forming means for forming an image on a recording medium based on image data, and a control means which controls said image forming means to execute image formation based on the image data of the read document when the image data of the read document is judged to be different from the stored image data by said image judging means, and for controlling said image forming means to execute image formation by said image forming means based on the predetermined image data stored in the memory means when the read image data is judged to be the same as the stored predetermined image data. 
     In the function of the image information processing apparatus of the present invention as described above, with respect to individual original documents having original image information, inquiry information corresponding to each is preliminarily memorized. The inquiry information is bibliographic information for facilitating work to search out the original document such as the name of the original document, storage position, etc. 
     In the case where the document to be processed by the apparatus of the present invention is the document reproduced from the original document, the code image data indicating the inquiry information is contained in the image data outputted by the image reading means. In other words, the reproduced document includes the image in which the original image and the code image for specifying the original document are composed. 
     Specific inquiry information is displayed based on the code image data, whereby an operator can readily find out about the original document on the basis of the reproduced document. 
     The code image for the reproduced document may be of an image obtained by encoding the inquiry information itself or of an image obtained, for example, by encoding the identification code imparted to the inquiry information. It is to be noted that the inquiry information is inputted through key operation by an operator, through wireless or radio communication by a transmitter, by network communication with external devices, etc. 
     On the other hand, upon reading of the image information of the original document, the image data is memorized as the original image information so as to correspond to the identification code, and thereafter, when the reproduced image corresponding to this original document is read, image formation is effected based on the original image information. Thus, even when the document is of the reproduced document, a reproduced item having the same image quality as in the reproduction by the original document may be obtained. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     These and other objects and features of the present invention will become apparent from the following description taken in conjunction with the preferred embodiment thereof with reference to the accompanying drawings, in which: 
     FIG. 1 is a block diagram illustrating the construction and function of a copying apparatus to which the present invention may be applied, 
     FIG. 2 is a block diagram showing the construction of an overall control section in the arrangement of FIG. 1, 
     FIG. 3 is a block diagram showing the construction of an information reading section in the arrangement of FIG. 1, 
     FIG. 4 is also a block diagram showing the construction of an inquiry information reading section in FIG. 3, 
     FIG. 5 is a flow-chart explaining the general functioning of an IR control section in FIG. 3, 
     FIG. 6 is a block diagram showing the construction of an operating panel in FIG. 1, 
     FIG. 7 is a schematic top plan view showing one example of a key arrangement on the operating panel, 
     FIG. 8 is a main flow-chart explaining approximate processing contents by a CPU for generalizing control of the copying apparatus, 
     FIG. 9 is a flow-chart explaining the processing corresponding to the reproduced document in FIG. 8, 
     FIG. 10 is a flow-chart explaining information retrieving processing in FIG. 9, 
     FIG. 11 is a flow-chart explaining the processing corresponding to the original document in FIG. 8, 
     FIG. 12 is a flow-chart explaining the identification code determining processing in FIG. 11, 
     FIG. 13 is a diagram showing the relationship between the identification code and the padded information, 
     FIG. 14 is a diagram explaining one example of a padded image corresponding to one padded information, and 
     FIG. 15 is a diagram showing on an enlarged scale, part of a reproduced image containing a padded image. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Before the description of the present invention proceeds, it is to be noted that like parts are designated by like reference numerals throughout the accompanying drawings. 
     Referring now to the drawings, there is shown in FIG. 1, a block diagram showing the construction and function of a copying apparatus to which the present invention may be applied. In FIG. 1, arrows in solid lines show flow of signals corresponding to image information X, while arrows in dotted lines indicate flow of signals corresponding to inquiry information. 
     In FIG. 1, the copying apparatus  1  is of a digital copying apparatus whose function is regulated by an overall control section  10 , and may be utilized as an image information identification apparatus for an inquiry to find a source for copying of the document (For example, if the document is a copy of a book, the book itself), besides utilization thereof as an image information reproducing apparatus for reproducing an image of a document on a paper sheet (i.e., a copying apparatus). Moreover, the copying apparatus  1  functions to provide a copied image having an image quality equal to that as obtained from the original document even when the document is a reproduced document, i.e., the function to prepare the “child” copy at all times. 
     An information reading section  11  reads the image information of the document as finely divided into pixels for conversion thereof into image data D of 8 bits (256 gradations) for output. Moreover, the information reading section  11  receives radio signals emitted by a transmitter fixed to a particular document for demodulation, and outputs the inquiry information X obtained thereby (i.e., information representing name of the original document, storage place thereof, etc). It is to be noted that in the following explanation, the image data D corresponding to the original document is represented by image data Do, and the image data D corresponding to the reproduced image, by image data Dc for distinguishing therebetween in some cases. 
     The image data D is transferred to an image memory  12  so as to be temporarily stored therein. Meanwhile, at the image memory  12 , the image of the original document is composed with a padded image to be described below. A printing section  13  reproduces the image composed by the image memory  12  on a paper sheet by a known electrophotographic process. 
     An operating panel section  14  is a man-machine interface, and includes an operating section  14 A for outputting signals according to the key operation input by the operator, and a display section  14 B for displaying types of information. The operator can input the inquiry information X through the operating section  14 A. 
     A memory section  15 , for example, a hard disk device is provided to alot a memory region ME of a predetermined capacity per each original document, and to memorize the inquiry information X and image data Do in correspondence identification code (identification number)N. 
     An image judging section  16  discriminates between the reproduced image and the original image of the documents by the presence or absence of the padded image, and in the case of a reproduced image having the padded image, the judging section  16  extracts the padded image data DN corresponding to the padded image from the image data Dc. 
     Here, the padded image is the image obtained by coding an identification code N, and is inconspicuously padded or embedded in the copied image during copying of the document. More specifically, in the copying apparatus  1  of the present embodiment, for the copying of the original document, the image of the document (i.e., original image) is not reproduced on a paper sheet as it is, but an image in which the original image is composed with the padded image is printed on the paper sheet, whereby the identification information (identification code N) of the original document is contained in the reproduced item (i.e., the “child” copy) by the copying apparatus in the form of the image information, and when the “child” copy is used as the document for copying, the copying apparatus  1  can recognize the “child” copy as the reproduction original. 
     A padded information restoring section  17  restores (or decodes) the identification code N of a predetermined number of bits (128 bits in this embodiment) from the padded image data DN. 
     A comparing section  18  retrieves or searches the contents stored in the memory section  15 , and selects the memory region ME in which the identification code N coincides with the decoded identification code N. In this case, the inquiry information X of the memory region ME as selected is transferred to the display section  14 B for display on a screen. At the time when the inquiry information X is displayed, the operator may stop the copying. In other words, in the above case, it may be regarded that the copying apparatus  1  was utilized as an image information identifying apparatus. In the case where the document is an original document, a padded information preparing section  19  imparts the identification code N to the original document. 
     Meanwhile, a padded image preparing section  20  encodes the identification code N received from either the padded information preparing section  19  or memory section  15  to prepare the padded image data DN, and by partially altering the image data Do in the image memory  12 , composes the original image with the padded image. It is to be noted here that, at this point in time, in the case of a reproduced original, the image data Dc is replaced by the image data Do transferred from the memory section  15  in the image memory  12 . 
     A communication managing section  21  communicates with other copying apparatus having a function equivalent to the copying apparatus  1 , and realizes the information exchanges between the copying equipment. 
     FIG. 2 is a block diagram showing the construction of the overall control section  10 . 
     The overall control section  10  includes a CPU (Central processing unit)  101 , a ROM (Read only memory)  102  in which the program is stored, and a RAM (Random access memory)  103  which serves as a work area for executing the program, which are coupled to respective function blocks through an input/output interface  104  for sending and receiving control signals and various data. 
     FIG. 3 is a block diagram showing the construction of the information reading section  11 . 
     The information reading section  11  includes an IR control section  111  having a CPU, a line scanning mechanism  112  provided with a scanner (not shown) to be displaced along a document face, an image reading section  113  which produces the image data D by the photoelectric conversion and quantization of reflected light from the document, an inquiry information reading section  114 , an ADF (automatic document feeder)  115  for transporting documents to the reading position, an image output interface  116  for outputting image data D, and an inquiry information output interface  117  for outputting the inquiry information X, which are coupled to each other as shown. 
     FIG. 4 is a block diagram illustrating the construction of the inquiry information reading section  114  in FIG.  3 . 
     The inquiry information reading section  114  includes an antenna  31  made of a transparent electro-conductive material and provided on a document platform glass  30 , and a receiving section  32  connected to said antenna  31  for demodulating radio signals and further, a signal converting section  33  which converts the demodulated signal into the inquiry information X of a predetermined format, and is further coupled to the IR control section  111 . 
     In the embodiment of FIG. 4, a book B is placed as a document, on the document platform  30 , and a transmitter  80  for transmitting the inquiry information X having the book name and book code as contents is attached to the book B. 
     The antenna  31  receives the radio signal emitted by the transmitter  80 , and sends it to the receiving section  32 . In other words, the inquiry information reading section  114  is provided to receive the inquiry information X by a wireless system, and becomes inactive when a document in general without a transmitter  80  is placed on the document platform  30 . It is to be noted here that the reception of the radio signal should preferably be effected before document scanning in order to avoid reception disturbance resulting from noises during lighting of an exposure lamp. Meanwhile, it may be so arranged to attach the antenna  31  to a scanner so as to receive the radio signal by performing a preliminary scanning without lighting the exposure lamp. 
     FIG. 5 is a flow-chart showing a general function of the IR control section  111  of FIG.  3 . 
     The IR control section  111  waits for a starting request from the CPU  101  after having initialized internal registers, etc. (Steps # 1 , # 2 ). Upon receipt of the starting request, the radio or wireless reception processing and inquiry information output processing are sequentially executed (Steps # 3 , # 4 ). Thus, upon receipt of the image request, the scan processing for output of the image data D is effected (Steps # 5 , # 6 ). 
     FIG. 6 is a block diagram showing the construction of the operating panel section  14  in FIG.  1 . 
     The operating panel section  14  generally includes an OP control section  141  mainly constituted by a CPU (not shown), an operating panel OP having a liquid crystal display  142  and a group of operating keys  143 , both coupled to the OP control section  141 , a time managing timer  144  backed up by a battery and also connected to the OP control section  141 , and an interface  145  for signal transmission coupled to said OP control section  141  as shown. 
     FIG. 7 shows one embodiment for an arrangement of keys for the operating panel OP. 
     In the operating panel OP, under the liquid crystal display  14 , there is disposed a start key  1430 , a reset key  1431  and character keys  1433  for inputting the inquiry information X and copying conditions as the group of operating keys  143 . 
     In the embodiment of FIG. 7, the inquiry information X includes such items as book name, keeper&#39;s name etc., and message Z 1  for signaling the operator as to the necessity for continuation of the copying operation are displayed. 
     Subsequently, the functions of the copying apparatus  1  will be explained more specifically based on flowcharts. 
     FIG. 8 is a main flow-chart showing the general processing functions of the CPU  101  (FIG. 2) for regulating control of the copying apparatus  1 . 
     Upon turning on a power source, the CPU  101  first initializes internal registers and RAM  103  (FIG.  2 ), and subsequently, carries out rising processing mainly directed to warming up of the image forming system for the electrophotographic process, and brings the copying apparatus  12  into a stand-by state (Steps # 11 , # 12 ). 
     The CPU  101  waits for the key operation to be effected, and upon input of the inquiry information X by the key operation, memorizes the inquiry information X as input thereto (Steps # 13 , # 14 , # 15 ). 
     In response to the instruction for copy starting, i.e., to depression of the start key  1430  (FIG.  7 ), the CPU  101  executes the information reading processing for sending the above start request and image request sequentially to the IR control section  111  (Steps # 16 , # 17 ). 
     In this case, when the inquiry information X is received through the IR control section  111  (FIG.  3 ), the inquiry information X is memorized in a similar manner as the input of the inquiry information X by the key operation. 
     Then, an image judgement in which the value of the image data D is checked per each pixel for detection of presence or absence of a padded image is carried out, and if there is a padded image, the processing corresponding to the reproduced document is effected to return to Step # 13 , while in the absence of a padded image, the processing corresponding to the original document is executed, and return is made to Step# 13  (Steps # 18 , # 19 , # 20 , # 21 ). 
     FIG. 9 shows a flow-chart for the processing corresponding to the reproduced document. 
     As is clear from the foregoing description, this sub-routine is started when a reproduced document has been read. 
     The CPU  101  first decodes the identification code N from the padded image data DN, and retrieves the memorized contents to search a code coinciding with the decoded identification code memorized in the memory section  15  (Steps # 31 , # 32 ). 
     When the result of the retrieval is a “hit”, i.e., in the case where a stored identification code N coincides with the decoded identification code N value, the inquiry information X memorized in correspondence with the coincided identification code N is displayed on the screen of the liquid crystal display  142  (FIG. 6) (Steps # 33 , # 36 ). Meanwhile, if the result of the retrieval search is a “non-hit”, retrieval of the memorized contents of the other copying apparatus connected to the network is carried out (Steps # 34 , # 35 ). By this arrangement, even when the document is a “child” copy prepared by the other copying apparatus, the inquiry information X that specifies the original document as the origin of copying can be displayed. 
     Following the display of the inquiry information X, the image data Do in the same memory region ME as the displayed inquiry information X is transferred to the image memory  12  from the RAM  103  (FIGS. 1,  2 ), and thus, the padding image is prepared so as to be padded in the original image (Steps # 37 , # 38 , # 39 ). 
     Thereafter, the message Z 1  as shown in FIG. 7 is displayed to wait for the operator instruction, and when the start key  1430  is depressed, the image data is read from the image memory  12 , and print processing is executed for forming the copied image including the identification information. Upon depression of the reset key  1431 , formation of the copied image is suspended for returning to the main routine. (Steps # 40 , # 41 ). 
     FIG. 10 is a flow-chart for the information retrieval processing in FIG.  9 . 
     When the identification code N to be compared with the decoded identification code N is present in the memory information, comparison is made sequentially one by one, and upon finding of the identification code N coinciding in value, the image data Do memorized in correspondence thereto is read so as to be retrieved from the RAM  103  (Steps # 321  to # 324 ). 
     FIG. 11 is a flow-chart for the processing corresponding to the original document in FIG.  8 . 
     This sub-routine is started when the original document has been read. The CPU  101  stores the image data Do as the original image information in the memory section  15 , and determines the value of the identification code N that corresponds to the original document information and the inquiry information X memorized earlier. (Steps # 41 , # 42 ). 
     Subsequently, a padded image in which the identification code N is encoded is formed, the padded image and the original image are then composed within the image memory  12  (Steps # 43 , # 44 ). Then, the print processing for preparing the “child” copy is executed and return is made to the main routine (Step # 45 ). 
     FIG. 12 is a flow-chart for the identification code determining process of FIG.  11 . 
     The CPU  101  sets the value of the identification code which is to provide the read image data with an initial value, and searches the equal value of the code is memorized (present) or not in the memory section  15  (Steps # 421 , # 422 ). In the case where the equal value as the set value is memorized (Step # 422 :Yes), the CPU  101  increases the value of the code and returns to the Step # 422  (Step # 424 ). When the equal value as the set value is not memorized (Step # 422 :No), the value set is determined as the value to be coded with the read image data (Step # 423 ). 
     Here, in the case where a plurality of copying apparatus are connected by signal lines to constitute the network, if the range of the value of the identification code N is set for each copying apparatus  1 , there is no obstruction in the information exchange between the copying apparatus. 
     Hereinafter, padding of the padding image into the original image will be specifically explained. 
     In the present embodiment, the identification code N which is the original information of the padded image, is binary data of a fixed length of 128 bits (16 bytes) as shown in (a) of FIG.  13 . However, it is possible to make the identification code N to be of a variable length, and to increase the bit number according to the increase of the number of the memory region ME, whereby the size of the padded image may be reduced to the necessary minimum. 
     The identification code N is hidden in the copied image as the padded image. In other words, the padded image is provided not in a blank portion of the paper sheet, but as part of the original image (i.e., the image before padded) in a form incorporated so as not to be conspicuous. 
     For the above reason, in order to facilitate the incorporation of the padded image, particularly even when the original image is comprised of character images, the identification code N is divided into multiple 16-bit rows, byte by byte. As shown in (b) of FIG. 13, the 16-bit information NI (each having a length of 2 bytes) added with a 4-bit block number, a 2-bit MSB and a 2-bit LSB for each row are formed. The padded information NI is dispersed in the copied image. It is to be noted here that in order to prevent the erroneous restoration, each padded information NI is provided at least at two places. 
     The block numbers provide information for arranging the 16 pad information NI in correct order for decoding the 16 byte identification code N. Meanwhile, MSB and LSB are provided to facilitate discrimination between the padded image and the other image. 
     FIG. 14 is a diagram showing one example of the padded image Gni corresponding to one padded information NI, and FIG. 15 is a diagram showing, on an enlarged scale, part of the copied image containing the padded image Gni. 
     In FIG. 14, the padded image Gni includes 34 pixels g aligned in one direction. Each bit of the padded information NI is adapted to correspond to every other pixel in the pixel row, and if the value of each bit is “0”, the density of the corresponding pixel g is set to be the same as that of the pixels g therearound, while if the value of each bit is “1”, the density of the corresponding pixel g is adapted to be slightly weaker than that of the pixels g therearound. 
     In the case where the image forming system has a resolution of 400 dpi, the length of the padded image Gni becomes about 2.35 mm. In the ordinary character image, since many dark color portions in the size of this extent are present, the padded images Gni of 16× n pieces equivalent to n pieces of identification code N may be padded without any obstruction. 
     It is to be noted here that the padding image Gni can be padded at any position in any orientation. Moreover, for making it possible to decode the identification code N even in the case where soiling takes place or partial cutting off or pasting is effected, it is also possible to pad many padding images Gni in directions different from each other. In that case, it is preferable to determine the effective identification code N by majority, with the number of sets adapted to be an odd number, in preparation for a case where errors take place in the decoding of part of the padded information NI. Furthermore, in the case where an original image is of an intermediate or half tone, etc., it is possible to improve the look of the image by adjusting the image density around the padded image for simultaneous facilitation of identification thereof. 
     It is to be noted here that, in the foregoing embodiments, although the description has been made that the image data Do when the original document was read is memorized as it is, and at the point in time for the print, the image data Do and the padded image data DN are to be composed, the arrangement may, for example, be so modified to memorize the preliminarily composed image data, and upon printing, the composing treatment is omitted for processing at higher speed. 
     It should also be noted that in the foregoing embodiments, although the identification code N corresponding to the inquiry information X is encoded and padded in the copied image, the inquiry information X itself may be padded. Meanwhile, the information specifying an original document may be printed at positions not overlapping the original image such as at an end portion on the surface of reverse surface or the printing paper, etc. In such a case, the shape of the information is not limited to the pixel pattern of a predetermined density, but may be of a code image such as a bar code, or an image readily readable by an operator such as a character image. 
     In the foregoing embodiment, if the history of selection is memorized with respect to each memory region ME, it becomes possible to sum up the frequency for utilizing the original document, and thus, the copying apparatus  1  may be effectively used for document management in which, for example, a frequently used document is stored so as to be readily taken out, or if the document is not utilized it is discarded. 
     Furthermore, in the foregoing embodiment, although there has been explained the arrangement in which copying is executed based on the image data Do of the original document stored in the copying apparatus when the copied document is read, it may be so modified that, by comparing the image data Dc of the copied document with the image data Dc as memorized, when the image data Do and Dc do not coincide with each other, copying is executed based on the image data Dc. In other words, a comparing section is provided for comparing the image data Dc read by the information reading section  11  and stored in the image memory  12 , with the image data Do stored in the memory section  15  corresponding thereto. When the data of these images is in agreement with each other, the image data Do in the memory section  15  is read into the image memory  12  to execute the print processing at Step # 41 , while in the case of non-agreement therebetween, the image data Dc in the image memory  12  may be utilized as it is to execute the print processing at Step # 41  (FIG.  9 ). In the arrangement as described above, even when an operator intends to effect copying through intentional modification of the image of the copying document, such copying is free from any obstruction. 
     In the above embodiment, although the example in which the inquiry information with respect to the original document is displayed on the display section has been explained, the arrangement may, for example, be so modified to print out the inquiry information as an output depending on necessity. Meanwhile, in the case where it is so arranged to cause the copying apparatus  1  to effect only the display or printing of the inquiry information X with respect to the original document, it is unnecessary store the image data Do in the memory section  15 , but it may be so arranged to have the memory section  15  to store only the inquiry information X. 
     As is clear from the foregoing description, according to the present invention, when the document is to be reproduced by a copying apparatus, reproduced items based on the original document can be readily obtained, and moreover, other effects available from the present invention are as follows. 
     Since individual code images to be preliminarily provided in the reproduced document for specifying the original document may be reduced to a small scale, loss of the original image information may be suppressed to minimum, while providing many code information having the same information, accuracy for decoding the information may be readily improved. 
     It is possible to memorize the inquiry information at the proper time with respect to the newly added original document also as well as the existing original document. 
     Even when the document at hand is of a reproduced document, it is possible to obtain on the spot, a reproduced item equal in quality to that directly available from the original document, without taking time for exchange with the original document. 
     Furthermore, the particular work for memorizing the original image information may be dispensed with. 
     Although the present invention has been fully described by way of example with reference to the accompanying drawings, it is to be noted here that various changes and modifications will be apparent to those skilled in the art. Therefore, unless such changes and modifications otherwise depart from the scope of the present invention, they should be construed as included therein.