JPH08205132A - Monitor camera controller - Google Patents

Abstract

PURPOSE: To eliminate the need for an external detecting device and to decrease the number of system constitution points by monitoring the density at a specific position photographed by a video camera at specific intervals of time, and switching the processing mode once it is judged that variation in illuminance is abnormal. CONSTITUTION: A video input part 1 inputs video signals from plural monitor cameras 50 and the video signals are converted by plural A/D conversion parts 2 into digital video signals, which are stored in an image storage part 3. The gate position setting part 91 of an illuminance abnormal variation judgement part 81 sets the gate position of an image signal from the storage part 3 and a gate part 10 extracts the illuminance signal of the gate position set by the setting part 9. This illuminance signal is added by an adder 11 and outputted as illuminance data, and an illuminance detecting means 12 detects variation in illuminance. Its data is inputted to an abnormality judgement part 13 and an abnormality table which contains the threshold value of illuminance variation is referred to, thereby judging abnormality of illuminance variation. If the variation is abnormal, a control part 7 switches the mode so that the video signal from a camera 50 which becomes abnormal is displayed on the entire screen.

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 and controlling an abnormal change in brightness at a predetermined screen position of each camera.

[0002]

2. Description of the Related Art A conventional surveillance camera control device is shown in FIG.
As shown in, the signals from the plurality of video cameras 50 are input to the input unit 1, the digital video signals converted by the A / D conversion unit 2 are stored in the respective image storage units 3, and the multi-switcher 4 multi-screens. Image processing such as processing and screen switching is performed, and the D / A conversion unit 5 converts it into an analog signal and outputs it to the output unit 6.
9-b of the monitoring camera control device 70 that outputs more
As shown in, the signals from the plurality of video cameras 50 are input to the input unit 1, the digital video signals converted by the A / D conversion unit 2 are stored in the respective image storage units 3, and the multi-switcher 4 multi-screens. Image processing such as processing is performed, and the D / A conversion unit 5 converts it into an analog signal, and the signal from the plurality of video cameras 50 and the analog signal subjected to the image processing and D / A converted are switched by the switch unit 15. In the surveillance camera control device that outputs from the output unit 6, an abnormality detection signal from an external detection device such as an infrared sensor 61 and a manual switch 62 is input to the control unit 7 to change the image processing mode and the switcher switching mode, The recording mode to the external recording device such as the above was changed. For this reason, the number of system components is large, and management is difficult.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a surveillance camera control device in which an external detection device such as an infrared sensor is unnecessary and the number of system components is reduced. There is.

[0004]

In order to solve the above-mentioned problems, the present invention inputs signals from a plurality of video cameras into an input section and stores digital video signals converted by an A / D conversion section in respective image storages. In the surveillance camera control device, the multi-switcher unit performs image processing such as multi-screen processing and screen switching, and the D / A conversion unit converts the analog signal and outputs the analog signal from the output unit. A position setting unit that sets a plurality of dot positions to be gated in the brightness signal read from the unit, a plurality of gate units that set and gate the position, and a plurality of brightness signals from the gate unit are added Luminance signal adder for outputting the luminance data, a plurality of luminance detecting means for detecting the luminance change by inputting the luminance data from the luminance signal adder, and a difference for judging an abnormal luminance change. A determination unit and a timer are provided, and the brightness of a predetermined position on the screen captured by each video camera is monitored at predetermined time intervals. When it is determined that the change in brightness is abnormal, the processing mode of the image processing is switched. Have control.

Further, signals from a plurality of video cameras are input to an input section, digital video signals converted by an A / D conversion section are stored in respective image storage sections, and image processing such as multi-screen processing is performed by a multi-switcher. In the surveillance camera control device, the D / A conversion unit converts the analog signal into analog signals, and the signals from the plurality of video cameras and the analog signals D / A converted by the image processing are switched by the switch unit and output. A position setting unit that sets a plurality of positions for reading the brightness signal from the image storage unit; and a brightness signal adder that adds a plurality of brightness signals at the positions set by the position setting unit and outputs the brightness data as brightness data. A plurality of brightness detecting means for inputting the brightness data from the brightness signal adder to detect a change in brightness; an abnormality determining section for determining an abnormal change in brightness;
A timer is provided to monitor the brightness at a predetermined position on the screen shot by each video camera at predetermined time intervals, and when it is determined that the change in brightness is abnormal, control is performed to change the switching mode of the switch section. There is.

Further, the position setting unit sets a position corresponding to N dots in a horizontal direction or a vertical direction from a predetermined position.

The brightness detecting means includes a plurality of brightness data storage units for sequentially storing the brightness data from the brightness signal adder, and a brightness data adder for adding the brightness data from the brightness data storage units. A sampling data storage unit for storing the addition result from the luminance data adder, an averaging unit for averaging the data from the sampling data storage unit and the data from the reference data storage unit, and the averaging unit. The reference data storage unit for storing the data of, and a comparison unit for taking a difference between the data from the sampling data storage unit and the data from the reference data storage unit,
Changes in brightness are detected.

The brightness detecting means stores a plurality of brightness data from the brightness signal adder and sequentially moves between the storage parts, and brightness data from the plurality of brightness data storage parts. A luminance data averaging unit, an average luminance data storage unit that stores the average luminance data from the luminance data averaging unit and sequentially moves between storage units, a reference data storage unit, and the average luminance data storage unit. And a shift control unit that sequentially shifts data between the brightness data storage unit and between the average brightness data storage unit and the reference data storage unit. And the change in brightness is detected.

Further, the abnormality judging section is provided with a table for storing a threshold value for a brightness change in advance.

[0010]

With the above-described structure, in the surveillance camera control device of the present invention, the screen positions serving as the brightness sensors of the plurality of surveillance cameras are set vertically or horizontally by N dots, and the set screen position N is set. The luminance signals of 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. The alarm signal is input to the control unit by the user, and when the alarm signal is input, the control unit changes the screen switching mode and the screen processing mode.

[0011]

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 video output unit 6 outputs the analog video signal according to a predetermined impedance and a predetermined level. A control unit 7 controls the A / D conversion unit 2, the image storage unit 3, and the like.

Reference numeral 81 denotes a plurality of brightness abnormality change judging sections, which are composed of a gate position setting section 91, a gate section 10, an adder 11, a brightness detecting means 12, and an abnormality judging section 13. The gate position setting unit 91 sets the gate position of each image signal from the plurality of image storage units 3. Reference numeral 10 denotes the gate unit, which extracts the luminance signal of the gate position set by the gate position setting unit 9 from each image signal from the plurality of image storage units 3. Reference numeral 11 denotes the adder, which adds the luminance signals from the gate unit 10 and outputs the result as luminance data. Reference numeral 12 is a brightness detecting means for detecting a change in brightness from the brightness data. Reference numeral 13 denotes the abnormality determination unit, which includes a determination unit 13a and an abnormality table 13b as shown in FIG. 5, which inputs the brightness change data from the brightness detection unit 12 and stores a brightness change threshold value in advance. The table 13b is referred to determine whether the brightness change is abnormal. Reference numeral 14 is a timer, which outputs a time signal of the time interval at which the gate unit 10 gates.

FIG. 2 is a block diagram showing another embodiment of the surveillance camera control device according to the present invention. In the figure, the same functional blocks as in FIG. 1 use the same symbols. Reference numeral 82 denotes a plurality of brightness abnormality change determination units, which are composed of a read position setting unit 92, an adder 11, a brightness detection unit 12, and an abnormality determination unit 13. A read position setting unit 92 sets N dot position data to be read from the image storage unit 3. Reference numeral 15 is a switcher, which is a video signal from the video input section 1 and the D / A conversion section 5
The video signal is switched to and input to the output section.

FIG. 3 is a block diagram showing an embodiment of the brightness detecting means 12. In FIG. 3, reference numeral 12a denotes a plurality of brightness data storage units which sequentially store the brightness data from the adder 11 for n screens. are doing. Reference numeral 12b is a brightness data addition unit, which adds n pieces of brightness data from the brightness data storage unit and outputs the result as brightness sample data. 12
A sample storage unit c stores the brightness sample data from the brightness data adding unit. A reference data storage unit 12d stores average data up to one screen before the averaging unit 12e as reference data. Reference numeral 12e is the averaging unit, which adds the reference data stored in the reference data storage unit 12d and the luminance sample data stored in the sample storage unit 12c, divides by 2, and averages. Reference numeral 12f is a comparison unit, which is the luminance sample data stored in the sample storage unit 12c and the reference data storage unit 12d.
The difference data is output by comparing with the reference data stored in.

FIG. 4 is a block diagram showing another embodiment of the brightness detecting means 12. In FIG. 4, reference numeral 12g is a plurality of brightness data storage units, which sequentially input the brightness data from the adder 11. Stores n screens. A luminance data averaging unit 12h adds the luminance data for the n screens, divides them for n times, and outputs an average value. An average data storage unit 12i stores the average brightness data from the brightness data averaging unit 12h. Reference numeral 12j is a reference data storage unit, which stores average brightness data up to one screen before stored in the average data storage unit 12i as reference data.
Reference numeral 12k is a comparison unit which compares the average luminance data from the average data storage unit i with the reference data from the reference data storage unit 12j and outputs the difference data.

The operation of the above arrangement will be described below. First, the example of FIG. 1 will be described. Video signals from a plurality of surveillance cameras 50 are input to the input unit 1,
The / D converter 2 converts the digital video signal into a digital video signal, which is stored in the image storage 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 a screen of a predetermined surveillance camera 50 to be a D / A conversion unit. 5 is input to the D / A converter 5, converted into an analog signal by the D / A converter 5, and output from the output unit 6. On the other hand, the image data read from the image storage unit 3 is gated by the gate unit 10 according to the gate position signal set by the position setting unit 91, and the n brightness signals thus gated are added by the adder 11. To obtain brightness data. FIG. 6 is a diagram showing an example of a screen position to be gated from the image data stored in the image storage unit 3. As a horizontal (x) and a vertical (y), from the position of coordinates (x, y) to (x
The positions of 8 dots up to +7, y) are set, and the luminance signals (S1, S
2, ..., S8) are extracted and the luminance signals for the eight dots are added by the adder 11 to obtain luminance data (Sb = S1 + S).
2 + ... + S8).

In the example shown in FIG. 2, the digital video signal similarly stored in the image storage section 3 is read out by the read position setting section 92.
8 brightness signals (S1, S
2, ..., S8) are read out and added by the adder 11 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 detection means.

The operation of the brightness detecting means 12 shown in FIG. 3 will be described below. The brightness data (Sb) to be input is the brightness data for four screens (Sb1, Sb2,
Sb3, Sb4) for each screen are stored in each storage unit 12a.
It is stored in (1) to 12a (4). The stored four screens of brightness data (Sb1, Sb2, Sb3, Sb4)
Is added by the brightness data addition unit 12b, and the added brightness data (Db) is stored in the sample storage unit 12c. In the averaging unit 12e, the added luminance data (Db) for four screens stored in the sample storage unit 12c and the reference storage unit 12 are stored.
The reference data (Ds) stored in d is averaged and stored in the reference storage unit 12d, and the sample storage unit 12 is also used.
The added luminance data (Db) from c and the reference storage unit 12d
The difference data (Ds-Db) obtained by comparing with the reference data (Ds) stored in the comparator 12f is output as a detection signal. FIG. 7 is a diagram showing a change in a signal for explaining the operation of the brightness detecting means 12, and FIG. 7-a shows a change in data input to the reference data storage unit 12d at the preparation stage. By operating without giving, the reference data (Ds) is converged and stored in the added luminance data (Db) after a fixed time, and is used as the next reference data (Ds). FIG. 7-b shows a signal when the added luminance data (Db) at a predetermined screen position is changed after monitoring is started, and the absolute value of the difference (Db-Ds) from the reference data is output as a detection signal. are doing.

Next, an example of the brightness detecting means 12 shown in FIG. 4 will be described. In the case of this example, the brightness data (Sb1, Sb2, Sb3, Sb4, Sb5) to be input is as shown in FIG.
As shown in (4), the data is input to (5) of the luminance data storage unit 12g, and the data is shifted and stored in the order of (4), (3), (2), and (1). Sixth luminance data (Sb6)
Is input, the luminance data (S) of (1) of the storage unit 12g (S
b1) is controlled so as to be discarded. Now, when the data for the fifth screen is input to (5) of the storage unit 12g, the average luminance data (Db) is obtained by adding the luminance data averaging unit 12h and dividing by 5. The average brightness data (Db) is stored in the average data storage unit 12i. On the other hand, the reference data storage unit 12j stores the average luminance data (Db) one screen before the average data storage unit 12i as reference data (Ds), and the reference data (Ds) and the average data storage The average brightness data (Db) stored in the unit 12i is compared by the comparison unit 12k, and the difference data (Ds-Db) is output as a detection signal.

The absolute value of the brightness detection signal obtained as described above, that is, the difference data (Ds-Db) of the brightness data is
It is input to the determination unit 13. This brightness detection operation is repeatedly performed at the time interval set in the timer 14 and input to the determination unit 13. The determination unit 13 shown in FIG. 5 compares this detection signal with a threshold value stored in advance in the table 13b,
If it is larger than the threshold value, the judgment unit 13a judges that the change in the brightness is abnormal and generates an alarm signal, which is input to the control unit 7. The threshold value stored in advance in the table 13b is set to a value that does not determine that the brightness of the environment changes gradually, such as in the morning or the evening, or noise is abnormal. Upon receiving the alarm signal, the control unit 7 controls the output unit 6 to change the mode so that the video signal from the camera 50 in which the alarm signal is generated becomes the entire screen, for example.

[0021]

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, when the alarm signal is input to the control unit and the alarm signal is input, the control unit changes the screen switching mode and the screen processing mode, so that an external detection device is not required and the number of system components is reduced. It is also possible to provide a surveillance camera control device.

[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 block diagram showing another embodiment of the surveillance camera control device according to the present invention.

FIG. 3 is a block diagram showing an embodiment of a brightness detecting means of the surveillance camera control device according to the present invention.

FIG. 4 is a block diagram showing another embodiment of the brightness detection means of the surveillance camera control device according to the present invention.

FIG. 5 is a block diagram showing an example of a determination unit of the surveillance camera control device according to the present invention.

FIG. 6 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. 7 is a diagram showing an example of generation of a reference data signal of the surveillance camera control device according to the present invention and comparison of luminance data.

8 is a diagram showing a shift operation of luminance data in a luminance data storage section of the luminance detecting means of FIG.

FIG. 9 is a block diagram of a conventional surveillance camera control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 video input section 2 A / D conversion section 3 image storage section 4 multi-switcher 5 D / A conversion section 6 output section 7 control section 81 abnormal brightness change determination section 82 abnormal brightness change determination section 91 gate position setting section 92 read position setting Section 10 gate section 11 adder 12 brightness detection means 12a brightness data storage section 12b brightness data addition section 12c sample storage section 12d reference data storage section 12e averaging section 12f comparing section 12g brightness data storage section 12h brightness data averaging section 12i average Data storage unit 12j Reference data storage unit 12k Comparison unit 13 Abnormality determination unit 13a Determination unit 13b Table 14 Timer 15 Video switcher unit

Claims (6)

[Claims] 1. A D / A system which receives signals from a plurality of video cameras, stores A / D-converted digital video signals in respective image storage sections, and performs image processing such as multi-screen processing and screen switching. In the surveillance camera control device for converting and outputting, a position setting unit that sets a plurality of dot positions to be gated in the brightness signal read from each of the image storage units, and a plurality of position setting units that set and gate the positions. , A luminance signal adder that adds a plurality of luminance signals from the gate portion and outputs the luminance data, and a plurality of luminance signals that the luminance data from the luminance signal adder are input to detect a change in luminance. A luminance detecting unit, an abnormality determining unit that determines an abnormal change in luminance, and a timer are provided, and the luminance at a predetermined position on the screen captured by each video camera is monitored at predetermined time intervals. When the determination is made, the monitoring camera control device is controlled to switch the processing mode of the image processing. 2. A digital image signal obtained by inputting signals from a plurality of video cameras and A / D-converted into each image storage unit, performing image processing such as multi-screen processing, and D / A
In a surveillance camera control device that converts and outputs the signals from the plurality of video cameras and the signals that have been image-processed and D / A converted by a switch unit and outputs the luminance signals from the image storage unit. A position setting unit to be set, a brightness signal adder that adds a plurality of brightness signals at the positions set by the position setting unit and outputs the brightness data, and brightness data that is input from the brightness signal adder Is provided with a plurality of brightness detecting means for detecting a change in brightness, an abnormality determining unit for determining an abnormal change in brightness, and a timer to monitor the brightness at a predetermined position on the screen captured by each video camera at predetermined time intervals. The monitoring camera control device is characterized in that, when it is determined that the change in brightness is abnormal, the switching mode of the switch unit is controlled to be changed. 3. The surveillance camera control device according to claim 1, wherein the position setting unit sets a position corresponding to N dots in a horizontal direction or a vertical direction from a predetermined position. . 4. The brightness detecting means includes a plurality of brightness data storage units for sequentially storing brightness data from the brightness signal adder, and a brightness data adder for adding brightness data from the brightness data storage units. A sampling data storage unit for storing the addition result from the luminance data adder, an averaging unit for averaging the data from the sampling data storage unit and the data from the reference data storage unit, and the averaging unit. Of the reference data storage unit and a comparison unit that takes a difference between the data from the sampling data storage unit and the data from the reference data storage unit, and detects a change in luminance. The surveillance camera control device according to claim 1 or 2. 5. The brightness detecting means stores a plurality of brightness data from the brightness signal adder and sequentially moves between the storage parts, and brightness data from the plurality of brightness data storage parts. A luminance data averaging unit for averaging
An average luminance data storage unit that stores the average luminance data from the luminance data averaging unit and sequentially moves between the storage units, a reference data storage unit, data from the average luminance data storage unit, and a reference data storage unit. A comparison unit that takes the difference of the data,
2. A shift control unit that sequentially shifts data between the brightness data storage units and between the average brightness data storage unit and the reference data storage unit, and detects a change in brightness. The surveillance camera control device according to claim 2. 6. The abnormality determination unit includes a table that stores a threshold value for a luminance change in advance, and a determination unit that refers to the table and determines an abnormality in the luminance change data from the luminance detection unit. The surveillance camera control device according to claim 1 or 2.