JP2009206633A - Crime prevention system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crime prevention system which can display a human body detected by a human body sensor while expanding. <P>SOLUTION: A sensor camera 1 has a section 13 for imaging a predetermined imaging range, and a plurality of human body sensors 14a for detecting a human body in different detection ranges having imaging ranges which overlap at least partially. On a liquid crystal panel 23a in a master unit 2, only a range corresponding to a human body sensor 14a which has detected a human body is displayed out of an image imaged at the imaging section 13 of the sensor camera 1. A human body detected by the human body sensor 14a is displayed while being expanded as compared with a case where the whole image imaged at the imaging section 13 is displayed according to the size of the liquid crystal panel 23a in a display section 23. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a crime prevention system using a camera and a human body sensor.

Conventionally, a camera that captures a predetermined imaging range, a human body sensor that detects a human body in a predetermined detection range that overlaps the imaging range, and a display that displays an image captured by the camera when the human body is detected by the human body sensor A crime prevention system including a device is provided (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 06-089390

  In the above-described crime prevention system, when the detection range of the human body sensor is narrower than the imaging range of the camera, when the entire image captured by the camera is displayed on the display device, the human body detected by the human body sensor is displayed as the entire image. Since it is displayed in a small size, the amount of information obtained is reduced. This problem is particularly noticeable when the camera is a so-called panoramic camera such as a wide-angle camera or an omnidirectional camera having a wide imaging range.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a crime prevention system capable of enlarging and displaying a human body detected by a human body sensor.

  The present invention relates to a camera that captures a predetermined imaging range, a plurality of human sensors that detect human bodies in different detection ranges that are at least partially overlapped with the imaging range of the camera, and any human sensor When a human body is detected by the above, at least a part of the detection range of the human body sensor that detects the human body is a different range depending on the human body sensor that has detected the human body among the images captured by the imaging unit. And a display device for displaying the range.

  According to the present invention, among the images captured by the camera, only the range corresponding to the human body sensor that has detected the human body is displayed on the display device, so that the entire image captured by the camera matches the size of the ideographic device. Compared to the display, the human body detected by the human body sensor is enlarged and displayed, and the amount of information obtained from the image displayed on the display device is increased.

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

  In this embodiment, as shown in FIGS. 1 and 2, a sensor camera 1 that is installed outdoors to detect a human body and captures an image, and a sensor camera that is installed indoors via a two-wire signal line 3 are used. 1 and a base unit 2 that displays an image captured by the sensor camera 1.

  The sensor camera 1 includes a communication unit 11 that transmits and receives electrical signals via a signal line 3, a call unit 12 for a call with the parent device 2, a predetermined imaging range, and an image that is captured as digital data. An imaging unit 13 as a camera that outputs as certain image data, a human body detection unit 14 that detects a human body M (see FIG. 3) in a range where at least a part of the imaging unit overlaps the imaging range, and at least one of the imaging range of the imaging unit 13 The communication unit 11, the call unit 12, and the imaging unit 13 are controlled in accordance with the illumination unit 15 capable of illuminating the part and the detection of the human body M by the electrical signal input through the communication unit 11 and the human body detection unit 14. And a control unit 16.

  The base unit 2 uses a communication unit 21 that transmits and receives electrical signals via the signal line 3, a call unit 22 for a call with the call unit 12 of the sensor camera 1, and image data input from the communication unit 21. The display unit 23 as a display device for displaying an image, the operation unit 24 that receives an operation input, and the communication unit 21 according to an electrical signal input through the communication unit 21 or an operation input received by the operation unit 24. And a control unit 25 for controlling the call unit 22 and the display unit 23, respectively.

  In each of the sensor camera 1 and the base unit 2, the call units 12 and 22 convert the input voice into an audio signal that is an electric signal, and the audio signal is transmitted via the communication units 11 and 21 and the signal line 3. Transmitting circuit (not shown), a receiving circuit (not shown) for converting a voice signal received via the signal line 3 and the communication units 11 and 21 into voice, a transmitting circuit and a receiving voice An audio signal input from the transmission circuit to the communication units 11 and 21 interposed between the circuit and the communication units 11 and 21 is compared with an audio signal input from the communication units 11 and 21 to the reception circuit. A voice switch (not shown) for switching the direction of the call by attenuating the lower level (ie, volume) and amplifying the higher signal level. More specifically, the transmission circuit includes a microphone that converts voice into a voice signal that is an electrical signal. The receiving circuit has a speaker that converts an audio signal into audio.

  In each of the sensor camera 1 and the parent device 2, the communication units 11 and 21 specifically include, for example, a known impedance matching circuit that matches impedance with the signal line 3. Here, since the image data and the audio signal can be simultaneously transmitted / received via the common signal line 3, the image data is stored in the control unit 16 of the sensor camera 1 in order to prevent the image data and the audio signal from interfering with each other. In FIG. 1, the image signal is transmitted after being converted into an image signal through a known modulation such as frequency modulation for multiplex transmission. The communication unit 21 of the parent device 2 includes a branching circuit that separates the image signal and the audio signal from the electrical signal received from the signal line 3. In the base unit 2, demodulation from the image signal to the image data is performed by the communication unit 21, for example.

  In each of the sensor camera 1 and the parent device 2, the control units 16 and 25 include, for example, a non-rewritable memory in which a program is stored in advance and a microcomputer that operates according to the program stored in the memory.

  Specifically, the imaging unit 13 of the sensor camera 1 generates image data by digitally converting an imaging element (not shown) to which an image is input from an imaging range, for example, via a wide-angle lens, and an output of the imaging element. A conversion circuit (not shown). As the image sensor, a CCD (Charge Coupled Device) type or a CMOS type can be used. In addition, the conversion circuit performs well-known distortion correction that planarly corrects image distortion caused by the wide-angle lens, and the image shown in the output image data is normally displayed as shown in FIG. This is wider in the left-right direction (horizontal direction) than the image output by the camera. That is, the imaging unit 13 is a so-called panoramic camera.

  The human body detection unit 14 of the sensor camera 1 includes three human body sensors 14a that detect a human body M in a detection range that is at least partially overlapped with the imaging range of the imaging unit 11, and that are different from each other, and each human body sensor 14a. A signal processing circuit (not shown) that inputs an electrical signal corresponding to the output to the control unit 16 of the sensor camera 1. As the human body sensor 14a, for example, a known heat ray sensor that detects a heat ray radiated from the human body M using a pyroelectric element can be used. In this case, a lens or a mirror that collects the heat ray on the pyroelectric element. The detection range can be designed by appropriately selecting the shape. When each human body sensor 14a generates a voltage output corresponding to the amount of heat rays incident from the detection range, the signal processing circuit compares the output voltage of each human body sensor 14a with a predetermined threshold voltage, When the output of any one of the human body sensors 14a exceeds the threshold voltage, it is determined that the human body M has been detected by the human body sensor 14a, and an electric signal indicating the human body sensor 14a in which the human body M has been detected is transmitted to the control unit of the sensor camera 1 16 is input.

  The illumination unit 15 of the sensor camera 1 includes a known electric light source 15a such as an incandescent lamp, and a lighting circuit (not shown) that is controlled by the control unit 16 to turn on the light source 15a. Since such an illuminating unit 15 can be realized by a known technique, a detailed description thereof is omitted. As shown in FIG. 1, the sensor camera 1 includes an imaging unit 13 and a human body detection 14 in such a manner that the human body sensors 14 a are exposed side by side at the lower end and the imaging unit 13 protrudes below the human body sensors 14 a. A housing 10a that holds each of the communication unit 11, the communication unit 12, and the control unit 16 and is fixed to the wall surface by screwing or the like, and holds at least the light source 15a of the illumination unit 15 and holds the light source 15a in the housing 10a. On the other hand, a lamp body 10c connected via an arm 10b so that the direction is variable is provided. That is, by changing the direction of the lamp body 10c with respect to the housing 10a, it is possible to change the range in which the light of the light source 15a is irradiated (that is, the range illuminated by the illumination unit 15). In addition, each human body sensor 14a has a different orientation in the horizontal direction, the detection range of the central human body sensor 14a is directed to the center of the imaging range in the horizontal direction, and the detection range of each of the left and right human body sensors 14a is Each is directed to one end in the horizontal direction of the imaging range.

  Specifically, for example, as shown in FIG. 1, the display unit 23 of the base unit 2 outputs the liquid crystal panel 23 a exposed at the upper end of the front surface of the base unit 2 and the communication unit 21 according to control by the control unit 25. And a drive circuit (not shown) for driving the liquid crystal panel 23a using the image data and displaying an image. In the example of FIG. 1, the plurality of push buttons 24a to 24g constituting the operation unit 24 are provided on the lower side of the liquid crystal panel 23a, respectively.

  Further, the master unit 2 includes sub-master units 2 a having substantially the same configuration, although not having some functions that are not particularly described herein, and push buttons 24 a to 24 that constitute the operation unit 24. 24 g of some push buttons 24 f, g, which do not have the display unit 23, but have the same call unit 22 as the main unit 2, and the same call as the call unit 12 similar to the sensor camera 1 A child unit 1 a and the like installed outdoors with a portion can be connected via the signal line 3. The master unit 2, the sub-master unit 2a, and the call sub-master unit 2b can communicate with each other via the call unit 22 in response to an operation input to the operation unit 24, and can communicate with the sensor camera 1 and the slave unit 1a. Communication with the unit 12 is also possible. The basic configuration of the secondary master unit 2a is the same as that of the master unit 2, and the call secondary master unit 2b and the slave unit 1a can be realized by well-known technologies, and thus detailed illustration and description thereof will be omitted.

  Hereinafter, the operation of this embodiment will be described. The control units 16 and 25 of the sensor camera 1 and the parent device 2 display the image picked up by the image pickup unit 13 on the display unit 23 according to the operation input received by the operation unit 24 of the parent device 2. 12 and 22, and an image captured by the imaging unit 13 when a human body is detected by the human body detection unit 14 of the sensor camera 1 without displaying an image on the display unit 23. The operation mode can be switched to a warning mode displayed on the display unit 23.

  As for the operation in the call mode, the same operation can be performed in a conventionally known TV door phone system, and thus detailed description thereof will be omitted, and the operation in the alert mode which is the gist of the present embodiment will be described. As described above, the human body detection unit 14 of the sensor camera 1 has the three human body sensors 14a provided side by side, and when the human body M is detected by any one of the human body sensors 14a, the human body detection is performed. The unit 14 inputs an electrical signal indicating which human body sensor 14 a has detected the human body M to the control unit 16. The control unit 16 of the sensor camera 1 operates the imaging unit 13 for a predetermined time from when the human body M is detected by the human body detection unit 14 and detects the human body M from the image data output by the imaging unit 13. A portion indicating a range previously associated with is extracted and converted into an image signal, and the image signal is transmitted to the parent device 2 via the communication unit 11. Here, the image shown in the image data output by the imaging unit 13 is a so-called panoramic image that is long to the left and right as shown in FIG. 3A, and the extracted range is that of the human body sensor 14 a that detects the human body M. For example, when the human body M is detected only by the central human sensor 14a, as shown in FIG. 3B, the panoramic image is centered in the left-right direction as shown in FIG. 3B. When the human body M is detected only by one of the left and right human body sensors 14a, at least one of the panoramic images in the left-right direction and the detection range of the human body sensor 14a that has detected the human body M is detected. One end where the parts overlap is extracted. In the base unit 2, the image in the above range is displayed on the display unit 23 under the control of the control unit 25.

  Here, when the human body M is detected by each of the plurality of human body sensors 14a, only a range corresponding to one of the human body sensors 14a that have detected the human body M may be extracted. A range including all the ranges corresponding to the respective human body sensors 14a that have detected the above may be extracted. Furthermore, when only a range corresponding to one of the human sensors 14a that detect the human body M is extracted, one of them may be the human sensor 14a that detects the human body M at the latest timing, or at predetermined intervals. Or may be switched in accordance with an operation input received by the operation unit 24 of the parent device 2.

  The sensor camera 1 also includes a setting unit 17 that receives an operation input for setting an operation. Specifically, the setting unit 17 includes, for example, a dip switch, and the presence or absence of an alarm when the human body detection unit 14 detects the human body M during the period in which the operation mode is the alert mode or the presence or absence of blinking of the illumination unit 15 is set. Is. In other words, in the alert mode when the alarm is set in the setting unit 17, the control unit 16 of the sensor camera 1 waits until a predetermined alarm time elapses after the human body M is detected by the human body detection unit 14. During the period, the speaker of the calling unit 12 is controlled to generate an alarm sound. In the alert mode when the lighting unit 15 is set to blink in the setting unit 17, the control unit 16 of the sensor camera 1 detects the alarm time after the human body M is detected by the human body detection unit 14. The illumination unit 15 is blinked in order to threaten the suspicious person detected by the human body detection unit 14 until the time elapses.

  According to the above configuration, since only the range corresponding to the human body sensor 14 a that has detected the human body M is displayed among the images captured by the imaging unit 13, the entire image captured by the imaging unit 13 is displayed on the display unit 23. The human body M detected by the human body sensor 14a is enlarged and displayed as compared with the case where it is displayed according to the size of the liquid crystal panel 23a, and the amount of information obtained from the image displayed on the display unit 23 is large. This is preferable for crime prevention.

  The number of human body sensors 14a is not limited to three and may be two or four or more.

  The imaging unit 13 of the sensor camera 1 may be a so-called omnidirectional camera capable of imaging 360 ° in the horizontal direction using a known omnidirectional mirror instead of the wide-angle lens. In this case, in order to secure a horizontal field of view, the sensor camera 1 is fixed or installed on a horizontal surface such as a ceiling surface or the ground instead of being fixed to the wall surface as in the above embodiment. Is desirable.

It is explanatory drawing which shows schematic structure of embodiment of this invention. It is a block diagram which shows the same as the above. (A) (b) is explanatory drawing which shows an example of an operation | movement same as the above, (a) shows an example of the image shown by the image data which the imaging part of a sensor camera outputs, (b) is (a). An example of the range displayed on the display unit of the master unit in the image is shown.

Explanation of symbols

13 Imaging unit (camera in claims)
14a Human body sensor 23 Display unit (display device in claims)
M human body

Claims (1)

A camera for imaging a predetermined imaging range;
A plurality of human sensors that detect a human body in a detection range that is at least partially overlapped with the imaging range of the camera and is different from each other;
When a human body is detected by any one of the human body sensors, at least one of the images captured by the imaging unit is different depending on the human body sensor that has detected the human body and the detection range of the human body sensor that has detected the human body. A crime prevention system comprising: a display device that displays a range in which parts overlap.

Images