JP2009146176A - Human body detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a human body detection system for providing a human body detection system capable of saving the trouble of setting a monitoring area being a target of human body detection by image processing. <P>SOLUTION: A sensor device 2 in the human body detection system is provided with a human body detecting part 21 for detecting a human body within a prescribed detection range, and a communicating part 22 for transmitting a detection signal to a sensor camera 1 when the human body detecting part 21 detects the human body. The sensor camera 1 is provided with an image determining part 12 for determining whether the human body exists in a monitoring area in an image picked up by an imaging part 11, and a control part 14 for detecting the human body when the image determining part 12 determines that the human body exists within a prescribed period of time after a sensor communicating part 13 for receiving a detection signal from the sensor device 2 receives a detection signal. The image determining part 12 of the sensor camera 1 recognizes a mark on the external appearance of the sensor device 2 in the image inputted from the imaging part 11 and automatically determines a monitoring area on the basis of the mark. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a human body detection system for detecting a human body.

  2. Description of the Related Art Conventionally, a human body detection system that detects a human body by using a human body detection by image processing and other human body detection means in combination has been provided and used for crime prevention, for example (see, for example, Patent Document 1).

This type of human body detection system can reduce detection omission when using a logical sum with the output of other human body detection means, compared to the case where human body detection is performed only by image processing, and other human body detection means. In the case of using a logical product with the output of, false detection can be reduced.
JP 2006-333144 A

  As described above, in the human body detection system using both human body detection by image processing and other human body detection means, the range captured for image processing is wider than the detection range that is the target of human body detection by the human body detection means. There are many cases. In addition, in an image used for image processing, when it is desired to remove a region that does not overlap the detection range from a monitoring region that is a target for human body detection, a setting operation by manual operation is necessary, which is troublesome.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a human body detection system that can save labor for setting a monitoring region to be a target of human body detection by image processing.

  The invention of claim 1 includes a sensor device and a sensor camera, and the sensor device detects a human body within a predetermined detection range, and a predetermined detection signal when the human body is detected by the human body detection unit. A transmission unit that transmits a detection signal transmitted from the sensor device, an imaging unit that captures a predetermined imaging range including the detection range, and an imaging unit. The human body exists based on the image determination unit that determines whether or not a human body exists in a predetermined monitoring area in the image captured by the image, and the detection signal received by the reception unit and the determination by the image determination unit The sensor device has a sign indicating the information of the detection range on the exterior, and is disposed within the imaging range of the imaging unit of the sensor camera, and the sensor camera image The determination unit is connected to the imaging unit. The sensor device label is extracted from the captured image, and the sensor device detection range region in the image captured by the imaging unit is estimated based on the extracted label, and the estimated detection range region The monitoring area determining operation is performed to determine the monitoring area so as to include.

  According to the present invention, since the monitoring area is automatically determined by the monitoring area determination operation of the image determination unit of the sensor camera, the trouble of setting the monitoring area can be saved.

  According to a second aspect of the present invention, in the first aspect of the invention, the sensor camera includes an image conversion unit that irreversibly compresses an image captured by the imaging unit and outputs the compressed image to an external display device. An image before irreversible compression by the conversion unit is used.

  According to the present invention, there is a possibility that the accuracy of determination by the image determination unit may be improved as compared with the case where the image determination unit uses an image that has been subjected to lossy compression.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the shape of the sensor device is used as a marker in the monitoring region determining operation.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the sensor device includes at least one light-emitting unit made of an electric light source and a lighting unit for lighting each light-emitting unit. The image determination unit uses the color of light of each light emitting unit as a marker in the monitoring region determination operation.

  The invention of claim 5 is the invention according to any one of claims 1 to 4, wherein the sensor device has a plurality of light emitting units each composed of an electric light source, and a lighting unit for lighting each light emitting unit, The image determination unit is characterized in that the arrangement of the light emitting unit is used as a marker in the monitoring area determining operation.

  A sixth aspect of the present invention is the sensor device according to any one of the first to fifth aspects, wherein the sensor device includes a plurality of light emitting units each composed of an electric light source, and a lighting unit that lights each light emitting unit in a predetermined pattern. And the image determination unit uses the lighting pattern of the light emitting unit as a marker in the monitoring region determination operation.

  The invention according to claim 7 is the invention according to any one of claims 4 to 6, wherein the lighting unit is configured so that each of the light emitting units is provided only during a period until a predetermined display time elapses after the detection signal is transmitted by the transmission unit. The image determination unit starts lighting a monitoring region when the detection signal is received by the receiving unit.

  According to the present invention, the power consumption is reduced as compared with the case where the light emitting unit is always turned on, and the image determination unit transmits the detection signal even when there are a plurality of sensor devices within the imaging range. The device label can be recognized correctly.

  The invention according to claim 8 is the invention according to any one of claims 1 to 6, wherein the sensor camera has a range determination instruction unit that receives an instruction to start the monitoring region determination operation, and the image determination unit includes the monitoring region determination operation. When the start instruction is received by the range determination instruction unit, the monitoring area determination operation is started.

  The invention according to claim 9 is the invention according to claim 8, wherein the sensor camera includes an operation mode instruction unit that receives an instruction to switch the operation mode to one of the reception standby mode and the image standby mode. Always operates, the image determination unit operates only after the detection signal is received by the reception unit until a predetermined determination time elapses, and the comprehensive determination unit determines that the human body is present by the image determination unit In the image standby mode, the image determination unit always operates, and the reception unit passes a predetermined reception time after it is determined by the image determination unit that a human body exists. The general determination unit is characterized in that it determines that a human body exists when a detection signal is received by the reception unit.

  According to the present invention, in both the reception standby mode and the image standby mode, the comprehensive determination unit detects the human body by the logical product of the image determination unit and the sensor device 2, so that the image determination unit and the sensor are detected. False detection is reduced compared to the case where only one of the devices is used. In addition, since one of the image determination unit and the reception unit is normally stopped, power consumption is reduced as compared to the case where both the image determination unit and the reception unit are always operated. Furthermore, switching between a reception standby mode suitable for a situation where the sensor device is easier to detect a human body than an image determination unit and an image standby mode suitable for a situation where the image determination unit is easier to detect a human body than the sensor device is possible. It becomes possible.

  According to the first aspect of the present invention, the sensor device has a sign indicating the information of the detection range on its appearance, and is disposed within the imaging range of the imaging unit of the sensor camera. The sensor device label is extracted from the image captured by the image capturing unit, the sensor device detection range region in the image captured by the image capturing unit is estimated based on the extracted label, and the estimated detection range region Since the monitoring area determination operation is performed to determine the monitoring area so as to include the monitoring area, the monitoring area is automatically determined by the monitoring area determination operation of the image determination unit of the sensor camera. Can do.

  According to the invention of claim 2, the sensor camera has an image conversion unit that irreversibly compresses an image captured by the imaging unit and outputs the image to an external display device, and the image determination unit is irreversible compression by the image conversion unit. Since the image before being subjected to is used, the accuracy of determination by the image determination unit may be improved as compared with the case where the image determination unit uses an image subjected to irreversible compression.

  According to the invention of claim 7, the lighting unit lights each light emitting unit only during a period until a predetermined display time elapses after the detection signal is transmitted by the transmission unit. Since the monitoring region determination operation is started when the detection signal is received by the receiving unit, the power consumption is reduced compared to the case where the light emitting unit is always turned on, and there are a plurality of sensor devices in the imaging range. Even when it exists, the image determination unit can correctly recognize the sign of the sensor device that has transmitted the detection signal.

  According to the invention of claim 9, the sensor camera includes an operation mode instruction unit that receives an instruction to switch the operation mode to one of the reception standby mode and the image standby mode. In the reception standby mode, the reception unit always operates, The image determination unit operates only during a period from when the detection signal is received by the reception unit until a predetermined determination time elapses. When the image determination unit determines that a human body is present, the human determination unit is present. In the image standby mode, the image determination unit always operates, and the reception unit only waits until a predetermined reception time elapses after the image determination unit determines that a human body exists in the monitoring area. The comprehensive judgment unit judges that a human body is present when a detection signal is received by the reception unit. Therefore, in both the reception standby mode and the image standby mode, the comprehensive judgment unit Since parts will be detects the human body by the logical product of the image determining unit and the sensor unit 2, erroneous detection can be reduced compared with the case of using one of the image determining unit and the sensor unit only. In addition, since one of the image determination unit and the reception unit is normally stopped, power consumption is reduced as compared to the case where both the image determination unit and the reception unit are always operated. Furthermore, switching between a reception standby mode suitable for a situation where the sensor device is easier to detect a human body than an image determination unit and an image standby mode suitable for a situation where the image determination unit is easier to detect a human body than the sensor device is possible. It becomes possible.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the present embodiment includes a sensor camera 1 that performs human body detection by image processing, and a sensor device 2 that performs human body detection independent of image processing in the sensor camera 1.

  Specifically, the sensor device 2 includes a human body detection unit 21 that detects a human body within a predetermined detection range SZ (see FIG. 3), a communication unit 22 for communication with the sensor camera 1, and a communication unit 22. For example, as shown in FIG. 2, it is installed on the ground or fixed to a support column. The human body detection unit 21 inputs a predetermined trigger to the control unit 23 when a human body is detected in the detection range SZ. Specifically, as the human body detection unit 21, for example, a well-known hot-wire sensor that detects a human body based on the amount of heat rays incident from the detection range SZ, or the detection range SZ is irradiated with ultrasonic waves or microwaves. A well-known ultrasonic sensor or microwave sensor that detects a human body based on the frequency or intensity of the ultrasonic wave or microwave reflected and received by the SZ can be used. When the trigger is input from the human body detection unit 21, the control unit 23 generates a detection signal indicating that a human body has been detected, and controls the communication unit 22 to transmit the detection signal to the sensor camera 1. . That is, the communication unit 22 is a transmission unit in the claims.

  In addition, the sensor camera 1 captures a predetermined imaging range CZ including the detection range SZ, and whether or not a human body exists in a predetermined monitoring area WZ in the image captured by the imaging unit 11. Whether or not a human body exists based on the image determination unit 12 to be determined, the sensor communication unit 13 for communication with the sensor device 2, the determination by the image determination unit 12 and the detection signal received by the sensor communication unit 13 And a control unit 14 as a comprehensive determination unit that finally determines whether or not.

  The parts of the sensor camera 1 will be described in detail. The imaging unit 11 converts a lens (not shown) and an image projected by the lens into an electrical signal, and periodically repeats every predetermined imaging time (for example, 200 milliseconds). And an A / D converter (not shown) for converting the output of the image sensor into a YUV signal and outputting the YUV signal. For example, a CCD image sensor or a CMOS image sensor can be used as the imaging element.

  The image determination unit 12 determines whether or not a human body exists in the monitoring region WZ by well-known human body detection in which appropriate image processing such as extraction of a moving body and detection of an edge is performed on the image captured by the imaging unit 11. judge. Since such an image determination unit 12 can be realized by a known technique, detailed description thereof is omitted.

  The sensor communication unit 13 of the sensor camera 1 and the communication unit 22 of the sensor device 2 may be connected to each other via a signal line to perform wired communication, or wirelessly using radio waves or infrared light as a medium. In any case, communication can be performed by a well-known technique, and detailed description thereof is omitted.

  Furthermore, the sensor camera 1 has a light source such as a discharge lamp and a sound source such as a buzzer, and is controlled by the control unit 14 when it is determined by the control unit 14 that a human body is present (a human body is detected). A threatening unit 15 is provided for threatening by turning on the light source or sounding the sound source. The sensor camera 1 is used by being connected to an interphone system, and includes a transmission unit 16 connected to a base unit (not shown) of the interphone system via a signal line (not shown), and an imaging unit 11. Is output to an image suitable for display on the parent device by appropriate irreversible compression such as thinning and averaging and transmitted to the parent device (“external display device” in the claims) via the transmission unit 16. And an image conversion unit 17.

  Here, the image used by the image determination unit 12 is an image that has not undergone irreversible compression by the image conversion unit 17. Thereby, compared with the case where the image determination unit 12 uses an image that has been irreversibly compressed by the image conversion unit 17, the image quality used by the image determination unit 12 is higher, so that the image determination unit 12 reflects fine changes in the image. When the human body detection method is used, the human body detection (determination) by the image determination unit 12 becomes more accurate. For example, in the case of a human body detection method in which it is determined whether or not the moving body is a human body based on the distribution of edge directions of the moving body extracted from the image, the higher the image quality as described above, the higher the accuracy of human body detection. To do.

  Further, as shown in FIG. 3, the monitoring region WZ that is the target of human body detection (determination) by the image determination unit 12 is a part rather than the entire image captured by the imaging unit 11. Thereby, compared with the case where the whole image is used for human body detection, the load applied to the image determination unit 12 is reduced, and erroneous detection can be reduced.

  In the present embodiment, the sensor device 2 is disposed in the imaging range CZ of the sensor camera 1, and the sensor device 2 has a sign indicating the information of the detection range SZ on the appearance, and the image determination unit 12 of the sensor camera 1. However, it is characterized in that a monitoring area determination operation for recognizing the marker of the sensor device 2 in the image input from the imaging unit 11 and automatically determining the monitoring area WZ is performed.

  For example, the shape of the sensor device 2 can be used as the label. More specifically, the sensor device 2 generates a detection range SZ in a predetermined direction like a heat ray sensor, for example. As shown in FIG. 4, the sensor device 2 faces the detection range SZ (the right side in FIG. 4). (Hereinafter referred to as the “front side”), a rectangular parallelepiped shape with one surface facing upwards and one surface facing each other in the up-down direction has a pentagonal prism shape with the upper and lower corners of the rear end dropped, and toward the detection range SZ. Both side surfaces adjacent in the horizontal direction to the front surface (right surface in FIG. 4) are pentagonal. The image determination unit 12 of the sensor camera 1 detects the orientation of the sensor device 2 by recognizing the outer shape of the sensor device 2 as described above using a known technique such as pattern matching. That is, the image determination unit 12 holds a data table indicating the correspondence between the standard pattern of the shape of the sensor device 2 and the orientation of the sensor device 2, and is detected in the image in pattern matching in the monitoring region determination operation. The orientation of the sensor device 2 is detected based on the orientation of the standard pattern and the data table.

  The sensor device 2 includes a plurality of light emitting units 24a to 24c each including an electric light source and constituting a sign, and a lighting unit (not shown) that supplies power to each of the light emitting units 24a to 24c to light them. ) Is provided. As the light emitting units 24a to 24c, for example, light emitting diodes can be used. In the example of FIG. 4, the three light emitting units 24 a to 24 c are arranged linearly in the front-rear direction, but the arrangement of the light emitting units 24 a to 24 c is not limited to this, and for example, as shown in FIG. 5, the rear light emitting unit 24 a The number of the light emitting portions 24b may be three, and the number of the light emitting portions 24b in the center may be two, so that the overall arrangement may be triangular. In addition, the light colors of the light emitting units 24a to 24c may be the same or may be different from one another, and when different, for example, the light color of the light emitting unit 24a at the front end is set to red, and the other light emitting units 24b, By making the color of the light of 24c green, the direction of the sensor device 2 can be indicated by the color of the light of the light emitting units 24a to 24c.

  The marking unit 24 (that is, the above-described lighting unit) is controlled by the control unit 23 of the sensor device 2. After the control unit 23 controls the communication unit 22 to transmit the detection signal to the sensor camera 1, the information regarding the detection range SZ is indicated by the lighting patterns of the light emitting units 24 a to 24 c over a predetermined display time. Control the sign section 24. Specifically, for example, as shown in FIG. 6, after turning on only the rear light emitting unit 24a for 1 second, the rear light emitting unit 24a is turned off and only the central light emitting unit 24b is turned on for 1 second. The direction of the sensor device 2 can be indicated by turning on the light emitting units 24a to 24c in order from the rear side to the front side, such as turning off the light emitting unit 24b at the center and turning on the light emitting unit 24c at the front end for 1 second. it can. Alternatively, the sensor device 2 is assigned an ID that is a unique number for each sensor device 2 in advance so that the detection signal includes ID information, and as shown in FIG. You may make it make all the light emission parts 24a-24c blink over predetermined time, after maintaining light extinction of all the light emission parts 24a-24c for the number of seconds of ID allocated to self. In this way, if the ID information is indicated by the detection signal and the sign, the detection signal and the sign are detected in the sensor camera 1 even when a plurality of sensor devices 2 exist in the imaging range CZ. Can be accurately recognized.

  Here, in the heat ray sensor serving as the human body detection means 21, a plurality of thin detection ranges in the left-right direction as viewed from the heat ray sensor are arranged side by side in the left-right direction with a gap therebetween, and the comb-shaped detection range as a whole. This type of heat ray sensor easily detects a human body that crosses the detection range in the left-right direction. Therefore, it is desirable to install the detection range in a direction intersecting the traveling direction in a place such as a corridor where the traveling direction of the human body is determined. Further, in the sensor camera 1, when the image of the image pickup unit 11 is output for use in display or authentication by another device, and when it is desired that a human face appears in the image of the image pickup unit 11, as described above. In such a place, it is desirable to install the imaging range CZ in the direction opposite to the traveling direction. Therefore, in the above case, the side surface of the sensor device 2 is directed toward the sensor camera 1, and therefore, the light emitting portions 24a to 24c are provided on the side surface of the sensor device 2 as shown in FIGS. desirable.

  In the sensor camera 1, the control unit 14 normally does not perform human body detection in the image determination unit 12 in order to reduce power consumption, and when the sensor communication unit 13 receives a detection signal, the image determination unit 12. First, a monitoring area determination operation is started. The image determination unit 12 recognizes a sign such as the shape of the sensor device 2 and the light colors of the light emitting parts 24a to 24c in the image input from the imaging unit 11, and obtains information indicated by the sign from the recognized sign. Further, the image determination unit 12 calculates the distance from the sensor device 2 based on the size of the sign on the screen (the area of the region that is the sensor device 2 and the interval between the light emitting units 24a to 24c). Further, the image determination unit 12 estimates the area of the detection range SZ of the sensor device 2 in the image based on the distance obtained by the above calculation and the information obtained from the recognized sign, and performs estimation. The monitoring area WZ is determined so as to include the detected area SZ. The shape of the monitoring area WZ is, for example, a rectangular shape.

  Here, the information that can be indicated by the sign of the sensor device 2 is the orientation of the sensor device 2, the shape and size of the detection range SZ, the identification information of the sensor device 2, and the like. The identification information is, for example, the corresponding information indicated by the detection signal as in the case of the ID described above, and indicates the correspondence between the detection signal that started the monitoring area determination operation and the sign. As a method for the image determination unit 12 to obtain information such as the shape and size of the detection range SZ from the sign, for example, the image determination unit 12 holds a data table indicating the correspondence between the sign and the information in advance. The method of using can be considered.

  In addition, the sensor device 2 can be a sign, such as the shape of the sensor device 2 itself, the arrangement of the light emitting units 24a to 24c, the color of the light emitted from the light emitting units 24a to 24c, and the lighting pattern of the light emitting units 24a to 24c. However, the information indicated by these plural types of signs may be common to each other or different from each other.

  In the case where plural kinds of signs among the signs indicate common information, the operation of the image determination unit 12 of the sensor camera 1 is further recognized as any one of plural kinds of signs indicating common information. If this is the case, the recognized signs are used for the monitoring area determination operation (hereinafter referred to as “logical sum operation”), and only when a plurality of kinds of signs indicating common information are recognized. There are two possible modes: an operation that does not perform the monitoring area determination operation using the method (hereinafter referred to as “logical product operation”). In the case of a logical sum operation, for example, when a priority order is previously determined among a plurality of types of signs indicating common information, and a plurality of types of signs indicating common information are recognized, each of the signs Even if the information indicated by is different from each other, the information indicated by the sign having the highest priority among the recognized signs is adopted. If the OR operation is employed, other cases such as when one of the light emitting units 24a to 24c does not light normally or when the outer shape cannot be recognized correctly due to a part of the sensor device 2 hidden behind an obstacle, etc. There is a possibility that the region of the detection range SZ can be accurately estimated using the label. On the other hand, if the logical product operation is employed, the image determination unit 12 of the sensor camera 1 may erroneously recognize a sign that is not a sign of the sensor device 2, such as a neon sign or illumination, at the time of the monitoring region determination operation. Can be prevented.

  Further, when different types of information are indicated by a plurality of types of labels, the direction of the sensor device 2 is recognized after first recognizing the direction of the sensor device 2 with one type of label (for example, shape). As a reference, an operation of recognizing other signs (for example, arrangement of the light emitting units 24a to 24c and lighting patterns) is possible. Also in this case, the image determination unit 12 of the sensor camera 1 can monitor the monitoring area by performing the monitoring area determining operation only when all of the plurality of types of signs are recognized. It is possible to prevent a sensor device 2 that is not a sign from being erroneously recognized as a sign during the determination operation.

  When the monitoring area WZ is determined, the image determination unit 12 next performs human body detection using the determined monitoring area WZ over a predetermined determination time. If the presence of the human body is determined by the image determination unit 12 during this determination time, the control unit 14 detects the human body and controls the threatening unit 16 to perform threatening by turning on the light source or sounding the sound source. That is, the control unit 14 detects a human body by the logical product of the human body detection by the sensor device 2 and the human body detection by the image determination unit 12. Therefore, compared to a case where a human body is detected by only one of the sensor device 2 and the image determination unit 12, false detection in which something other than the human body is erroneously detected is reduced.

  According to the above configuration, since the monitoring area WZ is automatically determined based on the sign recognized by the image determination unit 12 of the sensor camera 1, it is possible to save the trouble of setting the monitoring area WZ.

  Instead of determining the monitoring area WZ when the detection signal is received by the sensor communication unit 13 as described above, for example, an input unit (not shown) having a push button or a touch panel and receiving an operation input. ) Is provided in the sensor camera 1, and the control unit 14 controls the image determination unit 12 to determine the monitoring region when an operation input for instructing registration of the sensor device 2 (that is, determination of the monitoring region WZ) is performed in the input unit. The operation may be started. That is, the input unit is a range determination instruction unit in the claims. In this case, a signal for requesting on / off control of the sign unit 24 can be transmitted from the sensor communication unit 13 of the sensor camera 1 to the communication unit 22 of the sensor device 2, and the control unit 23 of the sensor device 2 is received by the communication unit 22. If the sign section 24 is controlled to be turned on / off according to the received signal, wasteful power consumption as in the case where the sign section 24 is always operated, and labor required when the sign section 24 is turned on and off manually are reduced. Is done. Furthermore, in order to avoid things other than the sign of the sensor device 2 being erroneously recognized as the sign, the communication unit 22 of the sensor device 2 is connected to the sensor communication unit 13 of the sensor camera 1 during the monitoring area determination operation. While transmitting the notification signal which shows the operation | movement content of the label | marker part 24, in the image determination part 12 of the sensor camera 1, what differs from the content shown in the notification signal received by the sensor communication part 13 among the recognized signs May not be used for the monitoring area determination operation. Furthermore, the sign unit 24 may be detachable from other parts of the sensor device 2 via a known connector. In this case, the sign unit 24 is removed after the monitoring region determining operation is completed, If the sign unit 24 is shared by the sensor device 2, the facility cost can be reduced as a whole facility using the plurality of sensor devices 2.

  Furthermore, the control unit 14 of the sensor camera 1 may alternatively be able to switch the operation mode of the sensor camera 1 between the reception standby mode and the image standby mode in accordance with an operation input to the input unit. . In this case, the input unit is an operation mode instruction unit in the claims.

  More specifically, during the period in which the operation mode is the reception standby mode, the control unit 14 operates the sensor communication unit 13 at all times, but normally does not operate the image determination unit 12 and detects from the sensor device 2. The image determination unit 12 is caused to perform a human body detection operation only during a predetermined determination time after the signal is received by the sensor communication unit 13, and the image determination unit 12 determines that a human body exists during the determination time. Sometimes detect human body.

  The reception standby mode is suitable when the human body detection by the sensor device 2 is more likely to occur than the human body detection by the image determination unit 12. Specifically, for example, when the sensor device 2 is a heat ray sensor or an ultrasonic sensor that does not use visible light and the monitoring area WZ is dark, the reception standby mode is suitable.

  On the other hand, during the period when the operation mode is the image standby mode, the control unit 14 causes the image determination unit 12 to always detect the human body while normally stopping the sensor communication unit 13. The sensor communication unit 13 receives a detection signal only during a period from when the image determination unit 12 determines that a human body exists (that is, when a human body is detected) until a predetermined reception time elapses, A human body is detected when a detection signal is received by the communication unit 13.

  The image standby mode is suitable when the human body detection by the image determination unit 12 is more likely to occur than the human body detection by the sensor device 2. Specifically, for example, when the sensor device 2 is a heat ray sensor, the human body is detected when the difference between the air temperature and the body temperature is small as in midsummer, or when the human skin exposure is small as in midwinter. Although it is difficult, the image standby mode is suitable in such a case when the monitoring area WZ is sufficiently bright.

  In both the reception standby mode and the image standby mode, the control unit 14 detects the human body by the logical product of the human body detection by the image determination unit 12 and the human body detection by the sensor device 2. And false detection are reduced as compared with the case where only one of the sensor device 2 and the sensor device 2 is used. In addition, since one of the image determination unit 12 and the sensor communication unit 13 does not normally operate, power consumption is reduced as compared with the case where both the image determination unit 12 and the sensor communication unit 13 are always operated.

  Further, a well-known brightness sensor (not shown) for detecting ambient brightness is provided, and the control unit 14 compares the brightness detected by the brightness sensor with a predetermined switching threshold to switch the brightness. The operation mode may be automatically switched such that the operation mode is the image standby mode if the threshold is equal to or greater than the threshold, and the operation mode is the reception standby mode if the brightness is less than the switching threshold.

  In addition, the transmission unit 16 may receive an instruction to start the monitoring area operation and an instruction to switch the operation mode. If this configuration is adopted, for example, the above instruction can be made by an operation input to the master unit connected to the transmission unit 16. In this case, the transmission unit 16 is a range determination instruction unit or an operation mode instruction unit in the claims.

It is a block diagram which shows embodiment of this invention. It is explanatory drawing which shows an example of the usage pattern same as the above. It is explanatory drawing which shows an example of operation | movement of a sensor camera same as the above. It is explanatory drawing which shows an example of the external appearance of a sensor apparatus same as the above. It is explanatory drawing which shows another example of the external appearance of a sensor apparatus same as the above. It is explanatory drawing which shows an example of operation | movement of a sensor apparatus same as the above. It is explanatory drawing which shows another example of operation | movement of a sensor apparatus same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sensor camera 2 Sensor apparatus 11 Imaging part 12 Image determination part 13 Sensor communication part (Receiving part in a claim)
14 Control part (Comprehensive judgment part in claim)
16 Transmission unit (range determination instruction unit, operation mode instruction unit in claims)
17 Image conversion unit 21 Human body detection unit 22 Communication unit (transmission unit in claims)
23 control unit 24 labeling unit 24a to 24c light emitting unit CZ imaging range SZ detection range WZ monitoring region

Claims (9)

A sensor device and a sensor camera;
The sensor device
A human body detection unit for detecting a human body within a predetermined detection range;
A transmission unit that transmits a predetermined detection signal to the sensor camera when a human body is detected by the human body detection unit;
Sensor camera
A receiving unit for receiving a detection signal transmitted from the sensor device;
An imaging unit for imaging a predetermined imaging range including the detection range;
An image determination unit that determines whether or not a human body exists in a predetermined monitoring region in the image captured by the imaging unit;
Based on the detection signal received by the reception unit and the determination by the image determination unit, and a comprehensive determination unit for determining whether a human body exists,
The sensor device has a sign indicating the detection range information on its appearance, and is disposed within the imaging range of the imaging unit of the sensor camera.
The image determination unit of the sensor camera extracts a label of the sensor device from the image captured by the imaging unit, and estimates a detection range region of the sensor device in the image captured by the imaging unit based on the extracted label. In addition, the human body detection system is capable of performing a monitoring area determination operation for determining the monitoring area so as to include the area of the estimated detection range. The sensor camera has an image conversion unit that irreversibly compresses an image captured by the imaging unit and outputs the compressed image to an external display device.
The human body detection system according to claim 1, wherein the image determination unit uses an image before being subjected to irreversible compression by the image conversion unit.   The human body detection system according to claim 1, wherein the shape of the sensor device is used as a mark in the monitoring region determination operation. The sensor device has at least one light-emitting unit made of an electric light source, and a lighting unit for lighting each light-emitting unit,
The human body detection system according to any one of claims 1 to 3, wherein the image determination unit uses the color of light of each light emitting unit as a marker in the monitoring region determination operation. The sensor device has a plurality of light emitting units each composed of an electric light source, and a lighting unit for lighting each light emitting unit,
The human body detection system according to any one of claims 1 to 4, wherein the image determination unit uses the arrangement of the light emitting unit as a marker in the monitoring region determination operation. The sensor device has a plurality of light emitting units each composed of an electric light source, and a lighting unit that lights each light emitting unit in a predetermined pattern,
The human body detection system according to claim 1, wherein the image determination unit uses a lighting pattern of the light emitting unit as a marker in the monitoring region determination operation. The lighting unit lights each light emitting unit only during a period until a predetermined display time elapses after the detection signal is transmitted by the transmission unit,
The human body detection system according to claim 4, wherein the image determination unit starts a monitoring area determination operation when a detection signal is received by the reception unit. The sensor camera has a range determination instruction unit that receives an instruction to start the monitoring region determination operation,
The image determination unit starts the monitoring region determination operation when an instruction to start the monitoring region determination operation is received by the range determination instruction unit. Human body detection system. The sensor camera includes an operation mode instruction unit that receives an instruction to switch the operation mode to one of the reception standby mode and the image standby mode.
In the reception standby mode, the reception unit always operates, the image determination unit operates only after a detection signal is received by the reception unit and until a predetermined determination time elapses, and the comprehensive determination unit is operated by the image determination unit. When it is determined that the human body exists,
In the image standby mode, the image determination unit always operates, and the reception unit operates only after a predetermined reception time elapses after it is determined by the image determination unit that a human body is present in the monitoring area. 9. The human body detection system according to claim 8, wherein when the detection signal is received by the receiving unit, it is determined that a human body exists.

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