JPH08205133A - Monitor camera controller - Google Patents

Abstract

PURPOSE: To sufficiently videotape the video of a monitor camera which has accurately caught a trespasser by setting the recording mode of a VCR once it is judged that variation in illuminance is abnormal, performing switching to the VTR output of a switch part, and changing the mode. CONSTITUTION: The video signal of a monitor camera 50 is inputted to an input part 1 and converted by an A/D conversion part 2 into a digital video signal, which is stored in an image storage part 3. The image data of this storage part 3 are read out under control 7 and inputted to a multiswitcher 4. The switcher 4 performs multiscreen editing, or displays the screen of the monitor camera 50 and inputs the signal to a D/A conversion part 5 to convert it into an analog signal, which is inputted to a switcher 6. The signal from the conversion part 5 and plural videos from an input part 1 are inputted to the switcher 6 and a monitor changeover switch 61 selects a video signal to be outputted to a monitor. Further, a VTR changeover switch 62 selects a proper video signal to be recorded by the VTR and outputs it to an output part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera control device, and more particularly to a control device for detecting an abnormal change in brightness at a predetermined screen position of each camera and changing a recording mode to a VTR or the like.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional surveillance camera control apparatus inputs signals from a plurality of video cameras 50 to an input section 1 and outputs digital video signals converted by an A / D conversion section 2, respectively. Stored in the image storage unit 3 of the D / A conversion unit 5 and the multi-switcher 4 performs image processing such as multi-screen processing.
In the surveillance camera control device for converting into an analog signal by using the switch unit 6 and converting the analog signal obtained from the plurality of video cameras 50 or the image-processed D / A converted analog signal by the output unit 7, An abnormality detection signal from an external detection device such as the sensor 91 and a manual switch 92 is input to the control unit 9, the display mode and the switcher switching mode are changed, and recorded in an external recording device such as a VTR. For this reason, it was not possible to sufficiently record the image of the surveillance camera which is accurately capturing the intruder.

[0003]

SUMMARY OF THE INVENTION The present invention solves the problems described above, does not require an external detection device such as an infrared sensor, and can sufficiently record an image of a surveillance camera that accurately captures an intruder. An object is to provide a surveillance camera control device.

[0004]

In order to solve the above-mentioned problems, the present invention inputs signals from a plurality of video cameras,
The A / D-converted digital video signal is stored in each image storage unit, image processing such as multi-screen processing is performed, D / A conversion is performed, and signals from the plurality of video cameras and the image processing are performed to perform D In a surveillance camera control device in which a / A-converted signal is switched by a switch unit and output from an output unit, a plurality of read positions of brightness signals are set from the image storage unit, and brightness for judging an abnormal change of the plurality of read brightness signals An abnormal change determination unit, a timer, and a recording mode setting unit that sets a recording mode to the VTR according to the abnormal change determination result of the brightness are provided, and the brightness at a predetermined position on the screen captured by each video camera is set at a predetermined time interval. When it is judged that the change in the luminance is abnormal, the recording mode to the VTR is set and the switching mode to the VTR output of the switch section is controlled to be changed. To have.

The recording mode setting unit is provided with a look-up table that stores the recording mode for the number of the surveillance camera that has detected an abnormality in brightness, and the switch unit has a monitor output changeover switch and a VTR output changeover switch. The output section is provided with a monitor output and a VTR output section.

[0006]

With the above configuration, in the surveillance camera control device of the present invention, when the screen positions serving as the luminance sensors of a plurality of surveillance cameras are set, and it is determined that the luminance change of the set screen positions is abnormal, When an alarm signal is input to the control unit and the alarm signal is input, the control unit appropriately changes the screen switching mode, the screen processing mode, the VTR recording mode, etc. according to the surveillance camera number in which the abnormality is detected. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A monitoring camera control device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a surveillance camera control device according to the present invention. In the figure, reference numeral 1 denotes a video input unit, which is a plurality of surveillance cameras 50.
The video signal from is input. Reference numeral 2 is a plurality of A / D converters which respectively convert a plurality of video signals from the video input unit 1 into digital video signals. Reference numeral 3 denotes a plurality of image storage units, each of which stores the digital video signal. Reference numeral 4 denotes a multi-switcher, which switches video signals read from the plurality of image storage units 4 to generate one-screen display data such as a multi-screen. Reference numeral 5 is a D / A converter, which converts the multi-video data from the multi-switcher 4 into an analog video signal. A switcher 6 is composed of a monitor changeover switch 61 and a VTR changeover switch 62. The video signal from the video input unit 1 and the D
The video signals from the A / A converter 5 are switched and input to the video output unit 7, respectively. Reference numeral 7 denotes the video output unit, which includes a monitor output unit 71 and a VTR output unit 72, and outputs the analog video signal in accordance with a predetermined impedance and a predetermined level.

Reference numeral 8 denotes a plurality of brightness abnormal change judging sections, which are composed of a read position setting section 81, an adder 82, a brightness detecting means 83, and an abnormal judging section 84. The read position setting unit 81 sets N dot position data to be read from the image storage unit 3. Reference numeral 9 is a control unit, which is the A /
It controls the D conversion unit 2, the image storage unit 3, and the like. Reference numeral 10 denotes a timer, which outputs a time signal of a time interval set and read by the read position setting section 81. A recording mode setting unit 11 sets the recording mode by referring to a look-up table 11a that stores in advance the switching mode of the VTR switch 62 for the surveillance camera number in which the abnormality is detected. Reference numeral 11a is the lookup table.

The operation of the above arrangement will be described below. Video signals from the plurality of surveillance cameras 50 are input to the input unit 1, converted into digital video signals by the A / D conversion unit 2, and stored in the image storage unit 3. The image data from the image storage unit 3 is controlled and read by the control unit 7 and is input to the multi-switcher 4 to be edited in a multi-screen or to be displayed on a screen of a predetermined surveillance camera 50, and D
It is input to the A / A conversion unit 5, converted into an analog signal by the D / A conversion unit 5, and input to the switcher 6. The switcher 6 includes a signal from the D / A converter 5 and the input unit 1
, A plurality of video signals are input, and the monitor changeover switch 61 selects a video signal for output to the monitor.
Further, the VTR selector switch 62 selects an appropriate video signal for recording on the VTR and inputs it to the output unit 7. The video signal input from the output unit 6 is output from the monitor output terminal in the monitor output unit 71, and the VTR output unit 72
Is output from the VTR output terminal.

FIG. 2 is a diagram showing an example of the read position set by the read position setting unit 81 from the image data stored in the image storage unit 3, and the coordinates (x, x) are the horizontal (x) and vertical (y) directions.
The position of 8 dots from the position of (y) to (x + 7, y) is set, and the luminance signals (S1, S2, ...
.., S8) are read out and added by the adder 82 to obtain luminance data (Sb = S1 + S2 + ... + S8).
Although N = 8 in this example, it is needless to mention that N can be selected as an arbitrary number. The brightness data (Sb) thus obtained is input to the brightness detecting means 83 and once stored, and then the brightness data (Sb1, Sb) for four screens is stored.
2, Sb3, Sb4) are added, and the added luminance data (Db) is compared with the reference data (Ds) to output difference data (Ds-Db) as a detection signal. FIG.
3A is a diagram showing a change in a signal for explaining the operation of the brightness detecting means 83, and FIG. 3A shows a change in the reference data in the preparatory stage, which is constant by operating without giving a brightness change. After the time, the reference data (Ds) converges on the added luminance data (Db) and is stored, and the next reference data (Ds) is stored.
Used as. FIG. 3B shows a signal when the added luminance data (Db) at a predetermined screen position starts to be monitored, and the absolute value of the difference (Db-Ds) from the reference data is output as a detection signal. are doing. The luminance detection signal obtained as described above, that is, the difference data (Ds-D) of the luminance data.
The absolute value of b) is input to the determination unit 84. This brightness detection operation is repeatedly performed at the time interval set in the timer 10 and input to the determination unit 84.

In the abnormality judging section 84, this detection signal is compared with a threshold value stored in advance in the table 84b. If the detection signal is larger than the threshold value, the judging section 84a judges that the change in brightness is abnormal and generates an alarm signal. Then, it is input to the control unit 9. The threshold value stored in advance in the table 84b is set to a value that does not determine abnormality such as a case where the brightness of the environment changes gradually such as morning and evening or noise.

When the control unit 9 receives this alarm signal, it controls the multi-switcher 4 to change the switching mode so that, for example, the video signal from the surveillance camera (1) 50 in which the alarm signal is generated becomes the entire screen. Input to the switcher 6 or by controlling the recording mode setting unit 11 to set the recording mode for the surveillance camera (1) 50 in which the alarm signal is generated by referring to the look-up table 11a. Changeover switch 62
And the switching mode of the monitor changeover switch 61 are changed.

FIG. 2 shows an embodiment of the look-up table 11a. For example, in the case of the surveillance camera number (1) that has detected an alarm, the camera (2) is switched to the recording time 6 of the camera (1). 2, camera (3) and camera (4)
The recording time of the camera (1) that has detected the alarm is set to be long, and the recording time of the camera (2) located in the vicinity thereof is set to be next long. Other cameras are set to record at short intervals in preparation for other intruders.

[0014]

As described above, according to the surveillance camera control apparatus of the present invention, the screen positions to be the brightness sensors of a plurality of surveillance cameras are set vertically or horizontally by N dots, and the set screen positions are set. The luminance signals of N dots are added to obtain luminance data, the luminance data is added for n screens, and it is determined to be abnormal if a change in the added luminance data or a change in average luminance data for n screens is larger than a predetermined threshold value. Then, the alarm signal is input to the control unit, and when the alarm signal is input, the control unit changes the screen switching mode and the screen processing mode, and enters a recording mode in which the monitoring camera to be recorded on the VTR or the like is accurately selected. Since it is changed, an external detection device is unnecessary, and a surveillance camera control device capable of sufficiently recording the video of the surveillance camera that accurately captures the intruder is provided. It is possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a surveillance camera control device according to the present invention.

FIG. 2 is a diagram showing an example of calculation of sensor position and brightness data of the surveillance camera control device according to the present invention.

FIG. 3 is a diagram showing an example of generation of a reference data signal of a surveillance camera control device according to the present invention and comparison of luminance data.

FIG. 4 is a table showing an example of recording modes for surveillance camera numbers for which alarms have been detected.

FIG. 5 is a block diagram of a conventional surveillance camera control device.

[Explanation of symbols]

 1 Video Input Section 2 A / D Conversion Section 3 Image Storage Section 4 Multi Switcher 5 D / A Conversion Section 6 Video Switcher Section 7 Output Section 8 Luminance Abnormal Change Judgment Section 9 Control Section 10 Timer 11 Recording Mode Setting Section 11a Look-up Table 61 monitor changeover switch 62 VTR changeover switch 71 monitor output section 72 VTR output section 81 read position setting section 82 adder 83 brightness detection means 84 abnormality determination section 84a determination section 84b table

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Claims (4)

[Claims] 1. A digital image signal obtained by inputting signals from a plurality of video cameras and performing A / D conversion in each image storage unit, performing image processing such as multi-screen processing, and D / A
In a surveillance camera control device for converting and outputting the signals from the plurality of video cameras and the signals subjected to the image processing and D / A converted by a switch unit and outputting from an output unit, a luminance signal is read from the image storage unit. An abnormal brightness change determination unit that sets a plurality of positions and determines an abnormal change in the read multiple brightness signals, a timer, and a recording mode setting unit that sets the recording mode to the VTR based on the abnormal brightness change determination result are provided. , Monitoring the brightness at a predetermined position on the screen captured by each video camera at a predetermined time interval, and when judging that the change in the brightness is abnormal, sets the recording mode to the VTR, and switches to the VTR output of the switch section. A surveillance camera control device, which is controlled so as to change modes. 2. The monitoring camera control device according to claim 1, wherein the recording mode setting unit is provided with a look-up table that stores a recording mode for a number of a monitoring camera that has detected an abnormality in brightness. 3. The surveillance camera control device according to claim 1, wherein the switch section is provided with a monitor output changeover switch and a VTR output changeover switch. 4. The surveillance camera control device according to claim 1, wherein the output section is provided with a monitor output and a VTR output section.