JPH0916876A - Crime prevention sensor and adjusting jig for this sensor - Google Patents

Abstract

PURPOSE: To provide the crime prevention sensor and the adjusting jig for this sensor which are applicable to the place, where privacy protection must be kept, and accurately direct the sensor to even a remote monitor area. CONSTITUTION: A crime prevention sensor 10 using a CCD area sensor 12 is provided with a signal output restriction removal circuit 19 which inhibits a picked-up image from being outputted to the outside as it is till the supply of a restriction removal signal, and an adjusting jig 30 for crime prevention sensor is provided with a restriction removal signal output part 40, which outputs the restriction removal signal, and an image display means 110 which displays the picked-up image from the crime prevention sensor 10 as it is by the output of the restriction removal signal. Thus, privacy protection is kept because the image picked up by the crime prevention sensor 10 cannot be seen as it is without the private jig. Since the monitor area can be confirmed by the image, the crime prevention sensor 10 is accurately directed to even the remote monitor area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security sensor using an image pickup means such as a CCD area sensor and a security sensor adjusting jig used for adjusting the security sensor.

[Prior art]

2. Description of the Related Art Conventionally, a crime prevention sensor has been studied which uses a television camera to perform warning in a surveillance area.
This type of security sensor has an advantage that it is easy to orient the TV camera because the surveillance area can be seen as it is. On the other hand, it is called a pyroelectric security sensor that detects the difference between far-infrared energy radiated from walls, floors, ceilings, etc. in the room and far-infrared energy equivalent to the body temperature radiated from the human body and outputs a detection signal. There is something.

[0003]

By the way, the above-mentioned conventional security sensor has the following problems. (B) In a security sensor using a TV camera,
Since the surveillance area can be seen as it is, it was difficult to apply it to places where privacy must be respected. (B) In the pyroelectric security sensor, it is difficult to direct it to the monitoring area because it detects the amount of incident energy fluctuation (change in heat quantity).

As a solution to the problems (c) and (b), there is a system in which a light source can be arranged between a sensor and a heat ray focusing mirror (Japanese Utility Model Application No. 59-188730).
This is a device in which a light source is arranged between the sensor and the heat ray focusing mirror when the sensor is oriented so that the light emitted from the light source is reflected by the heat ray focusing mirror and is applied to a wall, floor or person. Is. The user orients the sensor while checking this light. However, even if the light source arranging mechanism is provided, there is a drawback in that it becomes difficult to confirm the light as the monitoring area becomes farther, and it becomes difficult to orient the sensor.

Therefore, the present invention can be applied to a place where privacy must be respected, and
It is an object of the present invention to provide a crime prevention sensor and a crime prevention sensor adjustment jig that can accurately orient the sensor even if the monitoring area is far away.

[0006]

In order to achieve the above object, a security sensor according to the present invention comprises an image pickup means for picking up an image and an analog / digital conversion means for digitally converting an analog signal from the image pickup means. A dividing unit that subdivides the image pickup area of the image pickup unit into a plurality of blocks; a storage unit that stores an image of one screen imaged and digitally converted by the image pickup unit; and one screen image by the image pickup unit. Each time a minute image is captured, a predetermined algorithm analysis is performed on a change in block units between the one-screen image digitized and digitized this time and the previous one-screen image stored in the storage means. The crime prevention security section includes a determination unit that determines whether or not the user is a human, and a determination output unit that outputs a binary result of the determination when the determination unit determines that the user is a human. The output of the analog signal output from the image pickup unit is prohibited until the limit release signal is supplied from the outside (that is, the output of the captured image as it is is prohibited, and the output of the mosaic or scramble is prohibited). A signal output restriction releasing means for permitting output to the outside when the restriction releasing signal is supplied is provided (that is,
The output of the mosaic or scrambled image is canceled and the image is output as it is).

A preferred embodiment is, for example, claim 2
As in the invention described above, the determination means may have a function of outputting the position information on the one screen of the changed block to the outside through the signal output restriction releasing means. A security sensor adjusting jig according to a third aspect of the present invention is the security sensor adjusting jig used for adjusting the security sensor according to any one of the first and second aspects, wherein the limit is a limit release signal. A release signal output means and an image display means for capturing an analog signal output from the imaging means of the security sensor and displaying an image based on the analog signal are provided. CRT, liquid crystal,
Although EL (electroluminescence) or plasma is used, liquid crystal is preferable in terms of portability and price.

In addition to the structure of the crime prevention sensor adjusting jig according to the invention of claim 3, the crime prevention sensor adjusting jig according to the invention of claim 4 takes in the position information output from the security sensor, It further comprises block abnormality display means for displaying the horizontal position based on the position information in correspondence with the horizontal position of the image display means. Specifically, the block abnormality display means has a zone block abnormality display portion in which a number of light emitting diodes corresponding to the number of blocks in the horizontal direction of one screen are arranged along the horizontal direction of the image display means. Among the light emitting diodes, the one corresponding to the horizontal component of the changed block is turned on.

[0009]

According to the first aspect of the present invention, before the restriction release signal is externally supplied to the security sensor, an image with a mosaic or the like is output from the security sensor. When the restriction release signal is supplied, the security sensor outputs the image. The image as it is captured is output. Therefore, if the restriction release signal is not supplied, only the image with mosaic or the like is output, and the privacy can be protected. According to the second aspect of the invention, the security sensor outputs the position information of the block that has changed in each block of the captured image of one screen to the outside. Therefore, it is possible to externally recognize a change in the imaging area, that is, a human movement.

According to the third aspect of the present invention, the restriction release signal is output from the security sensor adjusting jig to the security sensor.
Then, when the analog signal is output from the security sensor in response to the restriction release signal, the analog signal is taken into the security sensor adjusting jig and displayed as an image. Therefore,
Since the image as it is captured by the security sensor can be viewed, the security sensor can be easily oriented to the monitoring area. According to the invention of claim 4, in the security sensor adjusting jig, the position information of the block that has changed in each block of the image of one screen imaged by the security sensor is fetched, and the position information The horizontal position is displayed in correspondence with the horizontal position of the image display means. Therefore, it is possible to recognize the change in the image pickup area, that is, the movement of the human being, as the outside.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the security sensor and the security sensor adjusting jig of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of a security sensor and a security sensor adjusting jig according to the present invention. The security sensor 10 of this embodiment is installed at a height of 2.5 m to 3.0 m from the floor as shown in FIG.
It is monitored by a lens 11 designed to monitor a 2.0 m range (monitoring area).

A. Security Sensor (a) Configuration of Security Sensor 10 In FIG. 1, 12 is a CCD (Charge Coupled Device)
It is an area sensor that converts the intensity of light into the magnitude of electric charge and outputs it. This CCD area sensor 12 has a lens 1
The image of the surveillance area is imaged by 1. A drive circuit 13 generates a drive pulse for driving the CCD area sensor 12 and also generates a clock signal and a vertical / horizontal synchronization signal to be supplied to the control unit 14. The drive pulse supplied to the CCD area sensor 12 is also supplied to the infrared wide-angle illumination unit 15. The infrared wide-angle illumination unit 15 has a plurality of infrared light emitting diodes, and these infrared light emitting diodes are intermittently turned on by a drive pulse supplied from the drive circuit 13.

A low-pass filter 16 extracts a signal component from the output of the CCD area sensor 12. Reference numeral 17 is a preamplifier that amplifies the signal level of the CCD area sensor 12 so as to match the A / D conversion input range. The signal (image signal) amplified by this preamplifier 17 is A / D
After being digitally converted by the converter 18, it is taken into the control unit 14. The image signal amplified by the preamplifier 17 is also supplied to the signal output restriction releasing circuit 19. The signal output restriction canceling circuit 19 usually mosaics or scrambles the image signal from the preamplifier 17 and outputs it to the outside, but the restriction canceling signal is supplied from the outside (that is, the security sensor adjusting jig 30 described later). Then, the image signal as it is captured is output. The restriction release signal may be a simple “H” / “L” binary signal, but a code consisting of two or more digits is desirable for strictness.

The control unit 14 includes a CPU, RO (not shown).
M and RAM (work memory) and the like,
A program for controlling the CPU is stored in the ROM. The control unit 6 supplies a conversion start signal to the A / D converter 18 at predetermined intervals to capture image data.
Then, the presence of a person is determined based on the image data and the previous (or before) image data stored in the data memory 21, and when it is determined that the person is present, the determination output circuit 22 outputs a detection signal. In this case, the presence of a person is determined by dividing the monitoring area into a plurality of blocks and performing an algorithmic analysis of changes in the image data for each unit, and determining the amount of change in brightness and the size of the blocks required in the analysis. The discrimination condition setting circuit 23 sets the judgment condition of the human movement.

The control unit 14 determines the presence of a person by dividing the monitoring area into a plurality of blocks and performing an algorithmic analysis of the change in the image data for each unit. It outputs a position signal indicating the corresponding horizontal and / or vertical position. This position signal is supplied to the signal output restriction releasing circuit 19, and is output to the outside through the connector 20 together with the signal from the preamplifier 17. The judgment output circuit 22 is provided with a relay (not shown), and its contact is closed when there is a command from the control unit 14. The contact output of the judgment output circuit 22 is the connector 2
It is output to the outside (monitoring center) via 4. The above C
The CD area sensor 12 corresponds to the image pickup means, the A / D converter 18 corresponds to the analog / digital conversion means, and the control unit 14 corresponds to the dividing means. Further, the control unit 14 and the identification condition setting circuit 23 constitute the determination means 100. Further, the data memory 21 corresponds to a storage means, and the determination output circuit 22
Corresponds to the determination output means, and the signal output restriction releasing circuit 19 corresponds to the signal output restriction releasing means.

(B) Operation of the security sensor 10 In the above configuration, after the power is turned on, first,
The control unit 14 reads each set value of the identification condition setting circuit 23 and stores each set value in the internal RAM. After this processing, the clock signal (CL
K) is taken in, a conversion start signal is generated based on this clock signal, and is supplied to the A / D converter 18. Next, the image data output from the A / D converter 18 is captured. Then, after the image data is captured, the previous (or previous) image data stored in the data memory 21 is read, and this image data is compared with the currently captured image data to determine the presence of a person.

In this case, as described above, the presence of a person is determined by dividing the monitoring area into a plurality of blocks and performing an algorithmic analysis of changes in image data for each unit. If it is determined that a person exists in this determination, the determination output circuit 22 outputs a detection signal. The detection signal is sent to a monitoring center (not shown) via the connector 24.
As a result, the surveillance center recognizes intrusion of a person into the surveillance area. The control unit 14 further supplies a position signal indicating the horizontal and / or vertical position corresponding to the block indicating the presence of a person to the signal output restriction releasing circuit 19. In this case, if the limit release signal is supplied to the signal output limit release circuit 19, the position signal is output to the outside through the connector 20 together with the image signal from the preamplifier 17.

B. Security Sensor Adjustment Jig (a) External Configuration of Security Sensor Adjustment Jig 30 FIG. 3 is a front view showing the external appearance of the security sensor adjustment jig 30. The security sensor adjusting jig 30 is used for adjusting the orientation of the security sensor 10 described above. In this figure, 31 is a display unit, which is a CRT, liquid crystal, EL
Alternatively, plasma is used, but liquid crystal is preferable in terms of portability and price. Reference numeral 32 denotes a zone block abnormality display unit in which a number of light emitting diodes (LEDs) corresponding to the number of horizontal blocks of one screen of the display unit 31 are arranged along the horizontal direction of the display unit 31, and the changed block The light-emitting diodes (at least one) corresponding to the horizontal component of are lit. For example, when the horizontal timing is THa to THn and the vertical timing is TVa as shown in FIG. 4 and there is a brightness change in the image block, only the light emitting diode of LED ₁ is turned on.

Returning to FIG. 3, reference numeral 33 denotes a light emitting diode for displaying an image capturing clock, which is turned on every time an image signal for one frame is supplied. A power switch 34 is turned on to supply power to each part of the apparatus. Reference numeral 35 is a connector through which an image signal or the like is taken in. When the orientation of the security sensor 10 is adjusted, the connector 35 and the security sensor 1 are used.
The connector 20 of 0 is connected by the cable 60.

(B) Circuit Configuration of Security Sensor Adjustment Jig 30 FIG. 5 is a block diagram showing the circuit configuration of the security sensor adjustment jig 30. In this figure, reference numeral 38 denotes an image signal capturing section, which captures an image signal and / or a position signal supplied via the connector 35 and supplies it to the display control section 39. The display control unit 39 creates display data from the image signal supplied from the image signal capturing unit 38 and supplies the display data to the display unit 31. Further, the display control unit 39 outputs a signal for turning on the light emitting diode of the zone block abnormality display unit 32 based on the received position signal. Further, the light emitting diode 33 is turned on each time the image signal for one frame is fetched.

Reference numeral 40 denotes a limit release signal output section, which continuously outputs the limit release signal from the time when the power switch 34 is turned on. This restriction release signal is sent to the connector 35.
Is output to the outside via. Here, the restriction release signal may be a simple "H" / "L" binary signal as described above, but a code having two or more digits is desirable for strictness. Reference numeral 41 is a power supply unit that generates a voltage required for the apparatus from the battery voltage. The restriction release signal output unit 40 corresponds to the restriction release signal output means. Further, the image signal capturing section 38, the display control section 39 and the display section 31 constitute an image display means 110, and the image signal capturing section 38 and the display control section 3 are included.
9 and the zone block abnormality display section 32 constitute block abnormality display means 120.

(C) Operation of the crime prevention sensor adjusting jig 30 In the above-mentioned configuration, when the power switch 34 is turned on, a limit release signal is output from the limit release signal output section 40, and the limit release signal is output via the connector 35. It is supplied to the security sensor 10. The security sensor 10 outputs the image signal of the captured image as it is by inputting the restriction release signal. In this case, if there is a position signal, it is also output at the same time. When the image signal is output from the security sensor 10, it is captured by the image signal capturing section 38 and supplied to the display control section 39. The display control unit 39 creates display data from the supplied image signal and supplies it to the display unit 31. Further, if the signal captured by the image signal capturing section 38 includes a position signal,
Based on the position signal, the zone block abnormality display section 32
The signal for lighting the light emitting diode of is output. Further, the light emitting diode 33 is turned on each time the image signal for one frame is fetched. The worker orients the crime prevention sensor 10 while watching the image displayed on the display unit 31 and the lighting of the light emitting diode of the zone block abnormality display unit 32.

As described above, in this embodiment, the security sensor adjusting jig 30 is connected to the security sensor 10 by the cable 60, and then the power is turned on to turn off the security sensor adjusting jig 3.
0 outputs a restriction release signal, and the restriction release signal releases the restriction such as mosaic in the signal output restriction release circuit 19 of the security sensor 10, and the image signal of the image as it is captured from the amplifier 17 is adjusted by the security sensor. It is supplied to the jig 30. The image signal supplied to the security sensor adjusting jig 30 is captured by the image signal capturing section 38, and then the display control section 39 creates display data and supplies the display data to the display section 31. When the position signal is output from the security sensor 10 together with the image signal, the security sensor adjusting jig 30
At least one of the light-emitting diodes of the zone block abnormality display section 32 corresponding to the position signal at that time is turned on. Therefore, the image as it is captured by the security sensor 10 cannot be viewed unless it is a dedicated jig, so that the privacy can be protected. Further, since the surveillance area can be confirmed by the image displayed on the display unit 31, the security sensor 10 can be accurately measured even in a distant surveillance area.
Can be oriented.

The present invention is not limited to the above-mentioned embodiments, and various embodiments are possible within the scope of the object of the present invention. Specifically, the following may be performed. (A) Since the security sensor 10 does not necessarily need to limit the mosaic or the like in a place where privacy is not required to be protected, a switch that can be manually released may be provided. For such a security sensor 10, it is not necessary to provide the restriction release signal output unit 40 on the security sensor adjusting jig 30, so that the cost can be reduced. (B) Not limited to mosaic or scramble, for example, noise may be added to the image signal. Instead of electrically blurring the image as described above, for example, an optical filter having a blurring effect may be provided in front of the lens 11 or between the lens 11 and the CCD area sensor 12, or A sensor cover having a blur effect may be used.

[0025]

According to the present invention, the following effects can be obtained. (1) Since the security sensor outputs only an image with a mosaic or the like unless a restriction release signal is supplied, a monitor that does not have a function of outputting a restriction release signal does not change the image captured by the image capturing means of the security sensor. Since you can't see, you can be sure to comply wherever privacy is needed. (2) The security sensor adjustment jig outputs the restriction release signal and captures the image signal from the security sensor to display the image, so that the image captured by the security sensor can be viewed as it is. Therefore, it is possible to easily orient the security sensor. Moreover, as long as the image captured by the security sensor can be seen, orientation can be performed even if the surveillance area is far away.

(3) In the security sensor, the position information of the block that has changed in each block of the image of one screen imaged is output to the outside, and the security sensor is adjusted in the security sensor in the security sensor adjusting jig. The position information of the block that has changed in each block of the captured image of one screen is fetched, and the horizontal position of the position information is displayed in correspondence with the horizontal position of the image display means. Therefore, it is possible to inform the outside of a change in the image pickup area, that is, the movement of a person, and since the positional information is used instead of the image information, the privacy protection can be surely observed in the same manner as described above.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of a crime prevention sensor and a crime prevention sensor adjusting jig according to the present invention.

FIG. 2 is a diagram showing a recognition guarantee area of the crime prevention sensor of the embodiment.

FIG. 3 is a front view showing the outer appearance of the crime prevention sensor adjustment jig of the embodiment.

FIG. 4 is a view showing an operation of the crime prevention sensor adjustment jig of the embodiment.

FIG. 5 is a block diagram showing a circuit configuration of a crime prevention sensor adjusting jig of the embodiment.

[Explanation of symbols]

 10 Security Sensor 12 CCD Area Sensor (Imaging Means) 14 Control Unit (Splitting Means) 17 Amplifier 18 A / D Converter (Analog / Digital Converting Means) 19 Signal Output Limit Release Circuit (Signal Output Limit Release Means) 21 Data Memory ( Storage means 22 Judgment output circuit (judgment output means) 30 Crime prevention sensor adjustment jig 31 Display section 32 Zone block abnormality display section 35 Connector 38 Image signal acquisition section 39 Display control section 40 Limit release signal output section (limit release signal) Output means) 100 determination means 110 image display means 120 block abnormality display means

Claims (4)

[Claims] 1. An image pickup means for picking up an image, an analog / digital conversion means for digitally converting an analog signal from the image pickup means, and a dividing means for subdividing an image pickup area of the image pickup means into a plurality of blocks. A storage unit that stores one screen of an image captured by the image capturing unit and digitally converted; and a one-screen image digitized and digitized each time the image capturing unit captures an image of one screen. A determination unit that determines whether or not a person is a human by performing a predetermined algorithmic analysis on a change in a block unit between the image and the previous one-screen image stored in the storage unit, and the determination unit is a human. In the crime prevention sensor including a determination output unit that outputs the result in binary when the determination is made, the image output unit outputs the limit release signal until an external limit release signal is supplied. Prohibits the output of the input analog signal to the outside,
A crime prevention sensor characterized by further comprising signal output restriction releasing means for permitting output to the outside when the restriction releasing signal is supplied. 2. The security sensor according to claim 1, wherein the determination means outputs the position information on the one screen of the changed block to the outside through the signal output restriction releasing means. 3. A crime prevention sensor adjusting jig used for adjusting the crime prevention sensor according to claim 1, further comprising: a limit release signal output means for outputting a limit release signal; A crime prevention sensor adjusting jig, comprising: an image display unit that takes in an analog signal output from the image pickup unit and displays an image based on the analog signal. 4. The block abnormality display means for fetching the position information output from the crime prevention sensor and displaying the horizontal position based on the position information in correspondence with the horizontal position of the image display means. The crime prevention sensor adjustment jig according to claim 3, wherein