JP2006333146A - Human body detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a human body detector which is improved in the reliability of human body detection by image processing and resistance to a malfunction by making it easy to set a detection area. <P>SOLUTION: With a test mode setting button 16 pressed, the human body detector in a normal mode enters a test mode for a specified period and in this test mode, a setter (human body B) moves within the range of a detection area A2 to be set in a visual field area A1 of an imaging section 10. Then when an image processing section 11 decides that a human body is detected from the movement of the human body B, a movement area detecting means 11c generates a movement frame E which is a rectangle or the like and circumscribed with the outline of the human body, at each image picked up during the test mode, a signal processing section 15 applies OR-processing to a plurality of detected movement frames E to put all the movement frames one over another within the visual field area A1, and sets areas in the respective movement frames E as detection areas, so that the detection areas are set in the visual field area A1 as one detection area A2 as the whole. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a human body detector.

  Conventionally, as a doorphone system that has a doorphone main unit installed indoors and a doorphone slave unit installed outdoors, and makes calls between indoors and outdoors, the presence of intruders and visitors in the detection area is displayed and confirmed as a video. For this reason, some surveillance cameras are installed outdoors and monitored by the doorphone master unit. In such doorphone systems, when a person enters the detection area, an image is transmitted to the doorphone master unit. Recording.

  In the door phone system, an image processing type human body detector that performs image processing of an image signal of a surveillance camera, a hot-wire sensor, or the like is used as a human body detector that detects intrusion of a person into a detection region (for example, Patent Document 1).

FIG. 10 shows a system configuration example of a door phone using the image processing type human body detector 400. The door phone parent device 100 is installed indoors in the house H, the door phone child device 200 is installed outdoors, and further in the garden. Has a light 300 equipped with an image processing type human body detector 400. The image processing type human body detector 400 includes an imaging unit (surveillance camera) 400a. When a human body is detected in the detection area of the imaging unit 400a by image processing, the image captured by the imaging unit 400a is transferred to the intercom base unit 100. While transmitting, the light 300 is turned on.
JP-A-8-154243

  The image processing type human body detector senses and notifies when a person intrudes into the detection area, regardless of the moving direction such as crossing or approaching the moving body in the detection area, and transmits the image to the door phone master unit And recording is required.

  Furthermore, image processing type human body detectors are also required to confirm images with a wide field of view at the time of human body detection.In order for image processing type human body detectors to detect human bodies in a wide detection area, the field of view of the imaging unit must be increased. Need to turn. However, when the field of view of the imaging unit is raised, false alarming factors such as people, cars, or tree shaking passing through the road can easily enter the detection area, and false alarms are likely to occur. There was a problem. Thus, the detection area setting is an important factor.

  The present invention has been made in view of the above-described reasons, and an object of the present invention is to provide a human body detector that facilitates the setting of a detection area and improves the reliability of human body detection and malfunction resistance through image processing. There is.

  The invention of claim 1 comprises a doorphone master unit installed indoors and a doorphone slave unit installed outdoors, enabling communication between indoors and outdoors, and detecting the movement of an outdoor person to monitor with the doorphone master unit In the human body detector used in the door phone system, the imaging means for continuously imaging the visual field region, and the human body in the detection region set in the visual field region by detecting the moving body by image processing each captured image Human body detection means for performing detection, mode switching means for switching to the test mode, and detection for setting a range formed by logical OR processing of a plurality of moving bodies generated in time series in the visual field area in the test mode as a detection area And an area setting means.

  According to the present invention, during the test mode, the setter can set the detection area only by moving within the detection area to be set. The detection area can be easily set so that a false alarm factor does not enter the detection area, the occurrence of the false alarm can be suppressed, and the reliability and malfunction resistance of human body detection by image processing can be improved.

  According to a second aspect of the present invention, in the first aspect, the detection area setting means sets, as a detection area, a trajectory of a moving body generated in time series in the visual field area in the test mode.

  According to the present invention, since the setter can set the detection area only by moving the outer periphery of the detection area to be set during the test mode, the setting operation of the detection area can be simplified.

  According to a third aspect of the present invention, in the first aspect, the detection area setting means detects a range formed by a logical sum process of the lower area of the moving body generated in time series in the visual field area in the test mode. It is characterized by setting as.

  According to the present invention, the extension line of the detection area does not extend far, the possibility of a false alarm in the detection area is reduced, and the reliability of human body detection and the malfunction resistance can be further improved.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the transmission device includes a transmission unit that transmits a captured image to the doorphone master unit. The transmission unit monitors the captured image in which the detection area is indicated by the doorphone master unit. A possible video signal is transmitted.

  According to the present invention, since the detection area is displayed in the background that is actually imaged in the door phone master unit, it is possible to prevent detection area setting errors by visual confirmation.

  According to a fifth aspect of the present invention, there is provided the video signal according to any one of the first to third aspects, further comprising transmission means for transmitting a captured image to an information terminal having a monitor screen, and capable of monitoring the captured image indicating the detection area by the information terminal. As a transmission.

  According to the present invention, the detection area setting can be confirmed near the human body detector, and the construction of the detection area setting is improved.

  As described above, in the present invention, the setting person can set the detection area only by moving within the detection area to be set during the test mode. The detection area can be set easily so that false alarming factors such as shaking do not enter the detection area, the occurrence of false alarms can be suppressed, and the reliability of human body detection by image processing and the malfunction resistance can be improved. There is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows functional blocks of an image processing type human body detector 1 according to the present embodiment, and an image processing type human body detector 1 is connected to a notification unit 2 and a door phone parent device 100 (see FIG. 10).

  The image processing type human body detector 1 includes an imaging unit 10, an image processing unit 11, a contour image storage unit 12, a YUV / NTSC conversion unit 13, a transmission unit 14, a signal processing unit 15, and a test mode setting button. 16 for performing human body detection by performing image processing on the captured image.

  The imaging unit 10 generates an image sensor that continuously captures the field of view in time series, converts the image output from the image sensor into digital data, generates grayscale image data, and outputs the YUV signal. It consists of a converter. As the imaging device, a solid-state imaging device such as a CCD, a CMOS image sensor, or the like is used. Further, if the device itself outputs a digital signal like a general CMOS camera, the A / D converter at the subsequent stage is not necessary.

  The image processing unit 11 includes a contour extracting unit 11a, a moving contour extracting unit 11b, a moving region detecting unit 11c, and a region feature amount detecting unit 11d.

  The contour extraction means 11a performs differential processing on the grayscale image data obtained from the imaging unit 10 using a generally known SOBEL filter or the like to extract edges (contours), and obtains an edge image for each image. It is stored in the contour image storage means 12 for a certain period.

  The moving contour extraction unit 11b performs logical synthesis using the time-series edge images stored in the contour image storage unit 12, and creates a combined image in which only the edges of the moving object are extracted.

  The moving area detecting unit 11c detects a region corresponding to a moving body (hereinafter referred to as a moving region) by labeling the composite image created by the moving contour extracting unit 11b. If this moving area is represented by a moving frame such as a rectangle circumscribing the outline of the moving body, the amount of data will be reduced and calculation will be easier.Unlike frame differences, etc., this area will have no afterimage and moved area. Only the edges of can be extracted.

  The region feature amount detection unit 11d determines the direction value of the moving edge portion in the moving region based on the edge image stored in the contour image storage unit 12 and the moving region of the moving object detected by the moving region detection unit 11c. Extract and create the edge direction value distribution. Then, using this edge direction value distribution as the feature quantity in the edge direction of the moving area, it is determined whether the area movement is caused by disturbance or by a person based on the feature quantity in the edge direction. If there is, the human body detection signal is output to the signal processing unit 15. Here, the edge of the human body has more curved parts than the straight part and has a complicated shape, so the edge direction is distributed in all directions, while the edge of the shadow of the structure has many linear components. The edge distribution tends to be a biased distribution.

  In addition, in order to determine whether or not a certain moving area represents a human body, it is also possible to store the edge direction value distribution in a table and compare the distribution with the edge direction value distribution table based on the movement of the human body. .

  The contour image storage unit 12 stores the edge image extracted by the contour extraction unit 11a for a certain period.

  The YUV / NTSC conversion unit 13 converts the YUV signal output from the imaging unit 10 into an NTSC signal.

The transmission unit 14 outputs the captured image by outputting the NTSC signal output from the YUV / NTSC conversion unit 13 to the doorphone master unit 100. The signal processing unit 15 is configured by a CPU or the like. While controlling operation | movement of each part of the image processing type human body detector 1, notification control of the alerting | reporting part 2 is performed.

  Then, the signal processing unit 15 determines that a human body has been detected when the human body detection signal from the image processing unit 11 is input, performs the notification operation in the notification unit 2, and transmits the YUV / NTSC conversion unit 13, the transmission. The image is transmitted to the intercom base unit 100 via the unit 14 so that the captured image can be monitored by the intercom base unit 100.

  The human body detection process is performed only in the detection area set in the test mode to be described later in the grayscale image data of the entire visual field area obtained from the imaging unit 10, and a test for setting a detection area for performing the edge extraction process The operation in the mode will be described below with reference to FIGS. 2 (a) to 2 (c) and FIGS. 3 (a) and 3 (b). First, the test mode setting button 16 is pressed (see FIG. 2A) to switch from the normal mode to the test mode, and automatically returns to the normal mode after a predetermined period T1 (see FIG. 2B). .

  During this test mode, the setter (human body B) moves within the detection area A2 to be set within the visual field area A1 of the imaging unit 10, as shown in FIG. When the image processing unit 11 determines that the human body B has been detected from the movement of the human body B, the moving area detection unit 11c has a quadrilateral circumscribing the outline of the human body B for each image captured during the test mode. A moving frame E is generated.

  Then, the signal processing unit 15 detects these moving frames E (see FIG. 2 (c)), performs a logical sum process of the plurality of moving frames E detected in time series at different times, and all of them are in the visual field region A1. The detection frames A2 are set in the visual field area A1 as a whole by overlapping the movement frames E and setting the areas in the movement frames E as detection areas as shown in FIG. . 3A and 3B show only a representative moving frame E, and a moving frame E (not shown) is generated between the illustrated moving frames E. FIG.

  As described above, in this embodiment, after the test mode setting button 16 is pressed, the setting person sets the detection area A2 only by moving within the detection area A2 to be set during the test mode of the period T1. be able to. Therefore, it can be set easily so that false alarming factors such as people or cars passing on the road or shaking of the tree do not enter the detection area A2, and the occurrence of false alarms can be suppressed, improving the reliability of human body detection and malfunction resistance. To do.

(Embodiment 2)
The image processing type human body detector 1 of the present embodiment has the same configuration as that of the first embodiment, but the setting operation of the detection area A2 is different. In addition, the same code | symbol is attached to the structure similar to Embodiment 1, and description is abbreviate | omitted.

  The operation in the test mode for setting the detection area A2 according to the present embodiment will be described with reference to FIGS. First, as in the first embodiment, the test mode setting button 16 is pressed to switch from the normal mode to the test mode, and automatically returns to the normal mode after a predetermined period T1.

  During this test mode, the setter (human body B) moves the outer periphery of the detection area A2 to be set in the visual field area A1 of the imaging unit 10 as shown in FIG. When the image processing unit 11 determines that the human body B is detected from the movement of the human body B, the moving area detecting unit 11c generates the moving frame E of the human body B for each image captured during the test mode. .

  Then, the signal processing unit 15 detects these moving frames E, performs a logical sum process on the plurality of moving frames E detected in time series at different times, and superimposes all the moving frames E in the visual field region A1. As shown in FIG. 4B, an outer periphery C of the locus of movement of each moving frame E is generated, and an area in the outer periphery C is set as the detection region 2 as shown in FIG. 4A to 4C illustrate only a typical moving frame E, and a moving frame E (not shown) is generated between the illustrated moving frames E. FIG.

  As described above, in this embodiment, after the test mode setting button 16 is pressed, the setting person sets the detection area A2 only by moving the outer periphery of the detection area A2 to be set during the test mode of the period T1. be able to. Therefore, it can be set easily so that false alarming factors such as people or cars passing on the road or shaking of the tree do not enter the detection area A2, and the occurrence of false alarms can be suppressed, improving the reliability of human body detection and malfunction resistance. To do.

  In addition, since the setting person moves and sets the outer periphery of the detection area A2, the setting operation is simplified compared to the first embodiment in which the entire detection area A2 is moved and set.

(Embodiment 3)
The image processing type human body detector 1 of the present embodiment has the same configuration as that of the first embodiment, but the setting operation of the detection area A2 is different. In addition, the same code | symbol is attached to the structure similar to Embodiment 1, and description is abbreviate | omitted.

  The operation in the test mode for setting the detection area A2 of the present embodiment will be described with reference to FIGS. 5 (a), 5 (b) and 6 (a), 6 (b). First, the test mode setting button 16 is pressed to switch from the normal mode to the test mode, and automatically returns to the normal mode after a predetermined period T1.

  During this test mode, the setter (human body B) moves within the range of the detection area A2 to be set within the visual field area A1 of the imaging unit 10, as shown in FIG. When the image processing unit 11 determines that the human body B has been detected from the movement of the human body B, the moving area detecting unit 11c lowers the lower half of the moving frame E of the human body B for each image captured during the test mode. (Hereinafter referred to as a moving frame lower part Ea).

  Then, the signal processing unit 15 detects these moving frame lower parts Ea, performs a logical OR process on the plurality of moving frame lower parts Ea detected in time series at different times, and superimposes all the moving frames E in the visual field area A1. In addition, as shown in FIG. 5B, by setting the area within each moving frame lower portion Ea as the detection area, one detection area A2 as a whole is set within the visual field area A1. 5A and 5B show only a typical moving frame lower portion Ea, and a moving frame lower portion Ea (not shown) is generated between the illustrated moving frame lower portions Ea.

  In the first embodiment in which the detection area A2 is set by the moving frame E, as shown in FIG. 6A, since the detection area A2 includes the upper part of the moving frame E, the extension line of the detection area A2 extends far. In some cases, a false alarm factor such as a tree D exists in the detection area A2. However, in the present embodiment, since the detection area A2 is set at the moving frame lower part Ea, the extension line of the detection area A2 does not extend far, and there is a possibility that a false alarm factor such as a tree D exists in the detection area A2. This reduces the human body detection reliability and malfunction resistance.

(Embodiment 4)
The image processing type human body detector 1 of the present embodiment has the same configuration as that of the second embodiment, but the setting operation of the detection area A2 is different. In addition, the same code | symbol is attached | subjected to the structure similar to Embodiment 2, and description is abbreviate | omitted.

  The operation in the test mode for setting the detection area A2 according to the present embodiment will be described with reference to FIGS. First, the test mode setting button 16 is pressed to switch from the normal mode to the test mode, and automatically returns to the normal mode after a predetermined period T1.

  During this test mode, the setter (human body B) moves the outer periphery of the detection area A2 to be set in the visual field area A1 of the imaging unit 10, as shown in FIG. When the image processing unit 11 determines that the human body B has been detected from the movement of the human body B, the moving area detecting unit 11c lowers the lower half of the moving frame E of the human body B for each image captured during the test mode. (Hereinafter referred to as a moving frame lower part Ea).

  Then, the signal processing unit 15 detects these moving frame lower parts Ea, performs a logical OR process on the plurality of moving frame lower parts Ea detected in time series at different times, and sets all moving frame lower parts Ea in the visual field region A1. As shown in FIG. 7B, the outer circumference Ca of the trajectory along which each moving frame lower part Ea has moved is generated, and the area within the outer circumference Ca is set as the detection area 2. 7A and 7B illustrate only a typical moving frame lower part Ea, and a moving frame lower part Ea (not shown) is generated between the illustrated moving frame lower parts Ea.

  In the second embodiment in which the detection area A2 is set by the moving frame E, as shown in FIG. 6A, since the detection area A2 includes the upper part of the moving frame E, the extension line of the detection area A2 extends far. In some cases, a false alarm factor such as a tree D exists in the detection area A2. However, in the present embodiment, since the detection area A2 is set at the moving frame lower part Ea, the extension line of the detection area A2 does not extend far, and there is a possibility that a false alarm factor such as a tree D exists in the detection area A2. This reduces the human body detection reliability and malfunction resistance.

(Embodiment 5)
The image processing type human body detector 1 according to the present embodiment enables the detection area A2 to be monitored on the monitor screen 100a of the doorphone master unit 100 as shown in FIG. Transmits a video signal in which the detection area A2 is superimposed on the actual captured image to the doorphone master unit 100, and the monitor screen 100 of the doorphone master unit 100 shows a broken line indicating the outer periphery of the detection area A2 on the actual captured image. F is pictographed.

  Therefore, since the detection area A2 is displayed on the background actually captured on the monitor screen 100a, an erroneous setting of the detection area A2 can be prevented by visual confirmation.

  If the two-way communication is possible between the doorphone master unit 100 and the image processing human body detector 1, the detection area A2 can be set while viewing the monitor screen 100a on the doorphone master unit 100 side. The hardware configuration such as the communication function for the mobile phone and the setting function in the doorphone master unit 100 becomes complicated. However, in the present embodiment, the detection area A2 is set by any one of the first to fourth embodiments, and the configuration is simplified by performing only the setting confirmation in the door phone parent device 100.

(Embodiment 6)
In the fifth embodiment, to confirm the setting of the detection area A2, a video signal in which the detection area A2 is superimposed on the actual captured image is transmitted from the image processing type human body detector 1 to the intercom base unit 100. The image processing type human body detector 1 transmits a signal for displaying only the detection area A2. Therefore, as shown in FIG. 9, only the broken line F indicating the outer periphery of the detection area A2 is displayed on the monitor screen 100a, and the hardware configuration for signal transmission is simplified.

  Further, the image processing type human body detector 1 is provided with an output terminal to which an information terminal with a monitor screen (cell phone, personal computer, etc.) can be connected, and the detection area A2 displayed on the monitor screen 100a in the fifth and sixth embodiments. If the information is displayed on the monitor screen of the information terminal, the setting confirmation of the detection area A2 can be performed near the image processing type human body detector 1, and the workability of setting the detection area A2 is improved.

  In addition, although the image processing type human body detector 1 and the notification unit 2 according to the first to sixth embodiments are separated from the door phone sub unit, the image processing type human body detector 1 and the notification unit 2 according to any one of the first to sixth embodiments. These functions may be incorporated in the door phone slave unit.

FIG. 3 is a functional block diagram of the image processing type human body detector 1 according to the first embodiment. (A) (b) (c) It is a figure which shows the timing chart at the time of the test mode same as the above. (A) (b) It is a figure which shows the setting operation | movement of the detection area same as the above. (A)-(c) It is a figure which shows the setting operation | movement of the detection area of Embodiment 2. FIG. (A) (b) It is a figure which shows the setting operation | movement of the detection area | region of Embodiment 3. FIG. (A) (b) It is a figure for demonstrating the detection area same as the above. (A) (b) It is a figure which shows the setting operation | movement of the detection area | region of Embodiment 4. FIG. FIG. 10 is a diagram illustrating a detection region confirmation operation according to a fifth embodiment. It is a figure which shows the confirmation operation | movement of the detection area of Embodiment 6. It is a figure which shows the system structural example of the conventional door phone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image processing type human body detector 2 Notification part 10 Imaging part 11 Image processing part 11a Outline extraction means 11b Moving outline extraction means 11c Moving area detection means 11d Area feature amount detection means 14 Transmission part 15 Signal processing part 16 Test mode setting button

Claims (5)

A human body used in a doorphone system that includes a doorphone master unit installed indoors and a doorphone slave unit installed outdoors, enabling communication between indoors and outdoors, and detecting the movement of an outdoor person and monitoring with the doorphone master unit In the detector, an imaging unit that continuously captures the visual field region, and a human body detection unit that detects a moving body by performing image processing on each captured image and detects a human body in the detection region set in the visual field region, , A mode switching means for switching to the test mode, and a detection area setting means for setting, as the detection area, a range formed by logical OR processing of a plurality of moving bodies generated in time series in the visual field area in the test mode A human body detector. The human body detector according to claim 1, wherein the detection area setting means sets the inside of the trajectory of the moving body generated in time series in the visual field area as the detection area in the test mode. 2. The detection area setting means sets, as a detection area, a range formed by logical sum processing of a lower area of a moving body generated in time series in a visual field area in a test mode. Human body detector. 2. The transmission device according to claim 1, further comprising: a transmission unit configured to transmit a captured image to the doorphone base unit, wherein the transmission unit transmits a video signal that allows the doorphone base unit to monitor the captured image indicating the detection area. 3. The human body detector according to any one of 3. 4. A transmission means for transmitting a captured image to an information terminal having a monitor screen, and transmitting the captured image showing the detection area as a video signal that can be monitored by the information terminal. Human body detector.

Images