Abstract:
Disclosed is a vehicle antitheft device not requiring a contract with a security company, etc., and increasing a vehicle antitheft effect. In the vehicle there are provided a camera or a microphone, and a control device for distinguishing a face or voice of a human by means of an image or sound captured by the camera or microphone, and based on distinction results, executing vehicle theft prevention control operations. The camera is provided at a position capable of capturing a normally seated driver and the outside through a window next to a driver&#39;s seat. Further, in the vehicle there is provided a radio communications unit. The control device records the captured image from the camera, judges whether the it is the face image of the person, and if it is, performs control so that the image is sent to a given reporting destination via the radio communications unit.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a vehicle antitheft device for preventing theft of an automobile. 
   2. Description of the Related Art 
   In a conventional vehicle antitheft device, a setting switch is set in an alert state, and when a door opening is detected with a signal from a sensor, a control device in an image transmission system judges that an abnormality has occurred based on the signal from the sensor, and it reports data indicating the occurrence of the abnormality, an image signal from a camera  4  and a voice signal collected by a microphone to a reporting destination such as a security company etc. stored in a reporting destination table via a radio communications unit (JP 11-328545 A, pages 2 to 3,  FIG. 1 , for example). 
   However, in the above-mentioned conventional vehicle antitheft device, it was necessary to enter into a contract with the security company etc. who serve as the reporting destination for reporting the abnormality, thereby being necessary to pay an expensive contract fee. 
   SUMMARY OF THE INVENTION 
   The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to obtain a vehicle antitheft device which is not necessarily requiring a contract with a security company etc., and is capable of increasing a vehicle antitheft effect. 
   A vehicle antitheft device according to the present invention includes in the vehicle a camera or a microphone, and a control device for distinguishing a face or a voice of a human by means of an image or sound captured by the camera or the microphone, and based on the distinction results, for executing vehicle theft prevention control operations. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     In the accompanying drawings: 
       FIG. 1  is an explanatory diagram showing a structure of an instrument panel area of a vehicle antitheft device in accordance with Embodiment 1 of the present invention; 
       FIG. 2  is a block diagram showing a structure of the vehicle antitheft device in accordance with Embodiment 1 of the present invention; 
       FIG. 3  is a flowchart for explaining operations of the vehicle antitheft device in accordance with Embodiment 1 of the present invention; and 
       FIG. 4  is a flowchart for explaining operations of a vehicle antitheft device in accordance with Embodiment 2 of the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Embodiment 1 
     FIG. 1  and  FIG. 2  are an explanatory diagram and a block diagram showing a structure of a vehicle antitheft device in accordance with Embodiment 1 of the present invention. As shown in  FIG. 1 , in an instrument panel of a vehicle, there are provided: a camera  4  provided at a position from which a driver in a normal seated position and an external area can be captured through a window beside a driver&#39;s seat, a display  21  with a built-in speaker  7  serving as a warning device, and an near-infrared illumination device  22 . These are connected to a control device  2  of an image transmission system  1 , and a radio communications unit  9  is connected to the control device  2 . 
   Further, as shown in  FIG. 2 , in addition to the camera  4 , the control device  2  is connected with a sensor  5 , a microphone  6  and the speaker  7 . A setting switch  8  is used to set an alert state, and when the sensor  5  emits a signal indicating that a door has been opened, a determination that an abnormality has occurred is made based on the signal from the sensor  5 , and data indicating the abnormality occurrence, an image signal from the camera  4 , and a sound signal collected by the microphone  6 , are reported via the radio communications unit  9  to a security company or other such reporting destinations which are stored in a reporting destination table  3 . 
   Next, explanation is made of operations according to the above-mentioned structure, mainly centered on control operations of the control device  2  shown in  FIG. 3 . First, in a state where the setting switch  8  is used to set the alert state, and the door of the vehicle is locked, when an unlocking operation is performed (step D 1 ), the control device  2  turns on the near-infrared illumination device  22  if the surroundings are dark, and then operates the camera  4 , to obtain an image every several seconds up to a certain number of images, and records them into a built-in memory (step D 2 ). Then, the control device  2  conducts image processing to judge whether or not a face of a person is in the obtained images (step SD 3 ). 
   If the face of a person is captured, a warning that a face image has been obtained is performed using the display  21  and the speaker  7  serving as the warning device, and simultaneously, the image in which the face is captured is sent via the radio communications unit  9  over the Internet to an address of an owner of the vehicle by electronic mail (step D 4 ). In a case where the person unlocking the door is unauthorized, the obtaining of an evidence image serves as a deterrent, thus exhibiting an antitheft effect at that point in time. 
   Further, also in a case where an operator performed an engine starting operation (step D 5 ), the image capturing and image storing are performed (step D 6 ), and it is judged whether or not the face of a person is captured in the obtained images (step D 7 ). If the face of a person is captured, a warning that the face image has been obtained is performed using the display  21  and by audio, and the image in which the face is captured is sent via the radio communications unit  9  over the Internet to the given address of the vehicle owner or the like by electronic email (step D 8 ), and simultaneously, starting of the engine is permitted (step D 10 ). 
   Even in a case where transmission could not be performed due to a status of electric waves, the starting of the engine is permitted and resending is attempted after a given amount of time. If the operator knows the existence of the camera  4  and has hidden the camera  4  or performed some other such operation, the control device  2  judges that the image obtained at step D 6  is not the face image (step D 7 ), and uses the warning device to urge the operator to let his/her face be captured (step D 10 ). If the operator still does not let his/her face be captured, the control device  2  does not permit the starting of the engine. 
   Further, after the control device  2  urges the operator by means of the warning device, it distinguishes whether or not the image captured by the camera  4  is the face of a certain person (step D 11 ). In a case where the captured image is the face image of the person, the image is transmitted by the radio communications unit  9 , and after performing the warning by the warning device, it approves the starting of the vehicle (step D 12  through step D 13 ). 
   Therefore, in order to start the engine, the face image must remains as evidence, and this deters the theft. Further, the face image is sent to the certain address even in a case where the operator is legitimate, and it is stored, but this does not become a problem due to a recent tendency of increased server capacity. 
   Further, since the image evidence is sent to the certain address by electronic mail immediately after it is captured, the unauthorized operator cannot destroy the evidence even if he/she disassembles the vehicle. 
   Further, in a case where a legitimate owner learns of the criminal act while the criminal act is being performed due to an electronic mail sent to his/her cellular phone or the like, the owner can send a command from the cellular phone to the control device  2  via the radio communications unit  9  of the vehicle to disable the movement of the vehicle, or can emit an alarm sound, a warning, a light or the like to intimidate the illegitimate operator. 
   Embodiment 2 
     FIG. 4  is a flowchart showing an operation of the vehicle antitheft device in accordance with Embodiment 2 of the present invention, mainly a control operation by the control device  2 . Hereinafter, the control operation is explained, making reference to the flowchart shown in  FIG. 4 . First, operation is started (step D 21 ), and when a certain speed of the vehicle is reached (step D 22 ), the control device  2  turns on the near-infrared illumination device  22  if the surroundings are dark, and then operates the camera  4 , obtains the images, and records them (step D 23 ). 
   The control device  2  performs the image processing to judge whether or not the face of a person is captured in the obtained image (step D 24 ). If the face of the person is captured, a warning that a face image is captured is performed using the display  21  and the speaker  7 , and simultaneously, the image in which the face is captured is sent via the radio communications unit  9  over the Internet to the address of the vehicle owner by electronic mail (step D 25 ). It is conceivable that a face photograph of a person or a doll is shown to the camera  4  while the vehicle is stopped, in order to contrive recognition of a person. However, this is difficult while driving, and the face image can be obtained more definitely. 
   While the vehicle is running, the control device  2  uses the camera  4  to constantly observe eye blinks of the driver. Based on a number of times and speed of the blinks, an arousal level of the driver can be estimated/detected using a known arousal level estimating technique (step D 26 ). In a case where it is judged that the arousal level is low, a warning is emitted (step D 27  through step D 28 ). Arousal level estimation for use in vehicles still is costly and is not popular at present. However, if the vehicle antitheft device as well as the control device and camera are owned together, it can be realized inexpensively, and diffusion can be promoted. 
   Embodiment 3 
   Note that, in the above-mentioned Embodiment 1 and Embodiment 2, the control device  2  used the image processing on the face image obtained by the camera  4  for the recognition of a person. However, when the operator performs the engine starting operation, vocalization can be urged and recognition of a sound obtained by the microphone  6  is used to recognize a person. The use of sound is less powerful as an evidence. However, since the camera does not have to be used, an inexpensive vehicle antitheft device can be obtained. 
   Embodiment 4 
   Further, in the above-mentioned Embodiment 1 through Embodiment 3, for the recognition of a person, the control device  2  judged only whether or not it is the face or the voice of a person. However, it is also possible to judge whether or not the face or the voice is that of a particular individual, such as the owner or family of the owner or the like. In the case where the judgment is made from the face, it may be made based on a wink or other such particular movement, whereas in the case where the judgment is made from the voice, a predetermined code word may be used. Accordingly, while this is inconvenient in a case where the vehicle is lent to someone, the security level can be raised. 
   Embodiment 5 
   Further, in Embodiment 1 through Embodiment 4, when it was judged that a person is not recognized, the starting of the engine was merely not permitted. However, it is also possible to emit an alarm sound, a warning, a light or the like to intimidate. As a result, the antitheft effect can be improved. 
   Embodiment 6 
   Further, in Embodiment 1 through Embodiment 5, the operations of the operator served as a trigger. However, the control device  2  may also be configured to start the vehicle antitheft operation by detection of an abnormality of vibration, impact, sound or heat by the sensor  5 . 
   As described above, in accordance with the present invention, a control operation for vehicle antitheft is executed based on a determination of the face or the voice of the human trying to operate the vehicle. Therefore, even without contracting with a security company or the like, the unauthorized operation and theft can be prevented and the vehicle antitheft device exhibiting a strong vehicle antitheft effect can be obtained.