JP2000050240A - Supervisory camera unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the supervisory camera unit for which a proper number of supervisory cameras are easily extended up to 8 or 9 cameras in total, while using 4 sets of cameras as a basic number. SOLUTION: This supervisory camera unit has plural standard input jacks 81 for connecting to camera heads and plural standard digital video encoders 28 each forming digital video data from a signal inputted to each standard input jack 81, has plural detachable A/D conversion boards 70 for extension purpose each of which incorporates an extension input jack 77 and a digital video encoder 73 that generates digital video data from a signal inputted to the extension input jack 77 and outputs the data to a data output terminal 78. Furthermore, the supervisory camera unit detects the number of the standard digital video encoders and the extended digital video encoders 75 and composites digital video data inputted from the digital video encoders 28, 75 to generate a video signal to display a multi-screen video image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera system having a plurality of surveillance cameras, and more particularly to a surveillance camera unit that performs image signal processing based on a video signal output from a surveillance camera. It is.

[0002]

2. Description of the Related Art Today, in order to monitor indoors or outdoors, a surveillance camera system in which a plurality of surveillance cameras are installed at predetermined positions and images taken by the installed surveillance cameras are projected on a monitor device in a surveillance room is frequently used. Have been.

As shown in FIG. 9, this surveillance camera system includes a plurality of camera heads 11 to 14 installed as surveillance cameras at a surveillance place, and CCD output signals output from the camera heads 11 to 14 are provided. Alternatively, the video signal is input to the monitoring camera unit 20 provided in the monitoring room, the signal processing such as the video signal is performed, and the video is displayed on the monitor device 67 or the like.

In many cases, each of the camera heads 11 to 14 has a built-in CCD which is a two-dimensional solid-state image pickup device.
An output signal is output from each of the camera heads 11 to 14 to the surveillance camera unit 20 to provide a surveillance camera system in which the camera head is downsized.
There is a surveillance camera system that forms a video signal by adding a vertical synchronizing signal and a horizontal synchronizing signal to a CD output signal, and outputs the video signal to the surveillance camera unit 20.

The surveillance camera unit 20 combines the signals input from the camera heads 11 to 14 to form a video for simultaneously displaying images shot by four camera heads on one screen, for example. If this video signal is output from the main output terminal 61, one monitor device 67 can always monitor four scenes where a monitoring camera is installed.

As shown in FIG. 9, as the monitoring camera unit 20 for constantly monitoring the scene captured by the four monitoring cameras, each of the camera heads 11 to 14 as shown in FIG. A first digital video encoder 21 to a fourth digital video encoder 24 for forming digital video data based on signals input from the units 11 to 14;
24, a first frame memory 31 and a second frame memory 32 for storing the digital video data formed by.

Further, the surveillance camera unit 20 has a write control means 37 for writing digital video data to both frame memories 31 and 32 and a read control means 38 for reading digital video data from both frame memories 31 and 32.
And a first camera head unit having four surveillance cameras.
When four images captured by the eleventh to fourth camera head units 14 are simultaneously displayed as four screens on the monitor device 67, a video signal obtained by combining the outputs of the digital video encoders 21 to 24 can be formed. Like that.

When synthesizing the outputs of the digital video encoders 21 to 24, the writing control means 37
Digital video data output from the digital video encoder 21 and the second digital video encoder 22 are stored in the first frame memory 31 so as to be switched for each horizontal scanning line, and the third digital video encoder 23 and the fourth
The digital video data output from the digital video encoder 24 is stored in the second frame memory 32 so as to be switched for each horizontal scanning line.

The read control means 38 first outputs digital video data from the first frame memory 31. In the control of the output of the digital video data, the read control means 38 outputs the video data of one pixel every time. The pixel data is sequentially deleted so that the pixel data is thinned out so as to output the video data for two horizontal scanning lines in one horizontal scanning time, and the data amount of the digital video data to be output is reduced by half. The digital video data for one frame or one field is output from the first frame memory 31 at a half frame time or a half field time.

When digital video data is read from the first frame memory 31 and then digital video data is output from the second frame memory 32, pixel thinning is performed to perform half frame time or half frame time. The digital video data for one frame or one field of the first frame memory 31 is output in one field time.

As described above, first, of the digital video data output from the first digital video encoder 21, data of odd scanning lines such as the first scanning line, the third scanning line, and the fifth scanning line are converted. While storing in the first frame memory 31, the second
The first frame memory 31 stores the digital video data output from the digital video encoder 22 in combination with data of even-numbered scanning lines such as the second scanning line, the fourth scanning line, and the sixth scanning line, Similarly, of the digital video data output by the third digital video encoder 23, the data of the odd scanning lines is stored in the second frame memory 32 while the even video data of the digital video data output by the fourth digital video encoder 24 is stored. The data is stored in the second frame memory 32 in combination with the data of the scanning line.

In this surveillance camera system, the operations of the camera head units 11 to 14 are synchronized based on a reference synchronization signal generated by the reference synchronization signal generation means 51 of the monitoring camera unit 20, and a frame memory for digital video data is provided. 31, 32
The timing and the like for writing and reading to and from a video signal based on the read digital video data are adjusted.

When reading the digital video data from the first frame memory 31 and the second frame memory 32, the digital video data is read from the first frame memory 31 first, and at the time of reading, the pixels are thinned out, for example, by NTSC. In the method of performing interlaced scanning as in the standard, digital video data for one field, in which pixels are decimated by half from the first frame memory 31, is output in a half field time. The digital video data corresponding to one field, which is obtained by thinning out the pixels to one half in one half field time from the digital video data, is output.

Therefore, the digital video data output from the first frame memory 31 and the second frame memory 32
The digital video data output from the main selector 45 is input to the main digital encoder 53 via the main selector 45, and the main digital encoder 53 adds a synchronizing signal and the like to form a video signal based on the digital video data, and the main output terminal 61 When the video signal is input to the monitor device 67 from the camera, one horizontal scanning line of digital video data of the video captured by the first camera head unit 11 and the video captured by the second camera head unit 12 within one horizontal scanning time And one horizontal scanning line of the digital video data is read out from the first frame memory 31 at a half field time, and similarly, the digital video data of the video captured by the third camera head unit 13 from the second frame memory 32 is read out. And the digital video data of the video captured by the fourth camera head unit 14 are read out at a half field time, as shown in FIG. The monitor screen 68 is divided into four parts, the scene photographed by the first camera head unit 11 is displayed at the upper left of the screen, the scene photographed by the second camera head unit 12 is displayed at the upper right of the screen, and the third camera is displayed at the lower left of the screen. An image displaying the scene shot by the head unit 13 and an image displaying the scene shot by the fourth camera head unit 14 can be displayed at the lower right of the screen.

The surveillance camera unit 20 has an auxiliary selector 47 for selecting digital video data output from the first digital video encoder 21 to the fourth digital video encoder 24. The video signal is shaped by the auxiliary digital encoder 55 based on the data, and can be output to the auxiliary output terminal 63.

Therefore, if the auxiliary output terminal 63 is connected to a monitor television, the image of the surveillance camera selected by the auxiliary selector 47 can be displayed on the entire screen of the monitor television as an auxiliary monitor device. , It is also possible to record a video taken by a specific camera head unit.

When recording a video image taken with a specific camera head by the video device 69, the video can be recorded by operating a switch 93 provided on the monitoring camera unit 20. A sensor 95 is provided at a location monitored by the first camera head unit 11 to the fourth camera head unit 14, and a detection signal of the sensor 95 is input to a central control unit 41 which is a microcomputer incorporated in the monitoring camera unit 20 to perform detection. The video data of the surveillance camera provided at the installation location of the sensor 95 that has output the signal may be selected by the auxiliary selector 47, and the video device 69 may be operated for a predetermined time by a control signal from the central control means 41.

In order to reduce the capacity of the frame memories 31 and 32, the first digital video encoders 21 to 4
When digital video data is formed by the digital video encoder 24, there is a type that forms digital video data of a luminance signal and a color difference signal instead of forming digital video data of RGB signals.

Further, the surveillance camera system shown in FIG. 9 is provided with four camera heads 11 to 14. However, when the number of surveillance places is large, nine surveillance cameras are used. Three frame memories are provided to store digital video data of a scene photographed by three camera heads in one frame memory, and the frame memories are stored every one horizontal scanning time in storing in the frame memories. The digital video encoders to be stored are sequentially switched, and the digital video data of the scene captured by the three camera heads is thinned out to one third of each scanning line.
The data amount is thinned out to one third so as to read out one pixel of digital video data for each pixel, and the digital video data obtained by thinning out the scanning lines and pixels is converted into a video signal by a digital encoder. A video signal may be formed to simultaneously display nine screens, each of which has been compressed to one third of the length and width of the screen without changing the aspect ratio of the image, on one monitor screen 68.

When monitoring four or more monitoring locations, two monitoring camera units 20 connected to the four camera heads shown in FIG. 9 are used, and as shown in FIG. The main output terminal 61 of the surveillance camera unit 20 is connected to the monitor device 67 via one switcher 65,
The selection of the input terminal of the switcher 65 is switched every predetermined time, and four scenes are simultaneously displayed on the four divided monitor screens 68, and the scene of the monitoring place is alternately switched every four places for monitoring. ing.

[0021]

As described above, in a surveillance camera system in which surveillance cameras are deployed at a plurality of locations, one monitor device simultaneously displays a plurality of scenes and performs centralized monitoring. Although a surveillance camera unit that synthesizes video signals from surveillance cameras or a surveillance camera unit that synthesizes video signals from nine surveillance cameras is used, the number of surveillance locations is four, eight, or nine.
Because it is not limited to locations, it is often difficult to install a surveillance camera system according to the number of required surveillance locations depending on the facility.

The present invention eliminates such drawbacks and, based on the number of surveillance cameras such as four, makes it easy to add an appropriate number of surveillance cameras to eight or nine. To provide.

[0023]

SUMMARY OF THE INVENTION The present invention relates to a surveillance camera unit in which a plurality of AD conversion boards can be attached and detached. The surveillance camera unit has a standard input jack for connection with a camera head and a standard input jack. A plurality of standard digital video encoders for forming digital video data from signals, an additional input jack for connecting to a camera head unit, and a data output terminal for outputting digital video data; A digital video encoder for forming digital video data from the signal input to the digital video encoder and outputting the digital video data to the data output terminal as a digital video encoder for expansion.
It has an extension space to attach and detach a plurality of D conversion boards, and also detects the number of standard digital video encoders and digital video encoders for extension and installs digital video data output by each standard digital video encoder. A surveillance camera unit having central control means for forming a video signal for displaying a multi-screen image by synthesizing the obtained digital image data output from the AD conversion board.

As described above, since the A / D conversion board having the additional input jack and the data output terminal and incorporating the digital video encoder is detachable, by mounting the A / D conversion board on the surveillance camera unit, It is easy to increase and change the number of camera heads used as surveillance cameras, and to form a multi-screen display video signal by synthesizing digital video data from a standard digital video encoder and AD conversion board. In addition, the image of the surveillance camera connected to the additional input jack of the AD conversion board can be displayed on the monitor device to monitor the scene at each monitoring place.

In the surveillance camera unit according to the present invention, the number of standard input jacks and the number of standard digital video encoders are each three or four, and nine or less cameras are provided by mounting an AD conversion board in an additional space. A monitoring camera unit that can be connected to the head unit, and
Detects the number of standard digital video encoders and additional digital video encoders, and if the total number of digital video encoders is 4 or less, forms a video signal of 4-screen synthesis, and if the total number of digital video encoders is 5 or more, Central control means for forming a video signal for nine-screen synthesis is provided.

As described above, the number of standard digital video encoders and the number of additional digital video encoders added by installing the AD conversion board are detected, and four-screen synthesis and nine-screen synthesis are performed in accordance with the total number of digital video encoders. When the number of connectable camera heads is increased or decreased by installing an AD conversion board because of the provision of central control means for switching between As a result, a video signal to be simultaneously displayed on a monitor screen can be formed.

Further, the surveillance camera unit according to the present invention has four standard input jacks and four standard digital video encoders, and has an additional space for mounting four AD conversion boards. When a conversion board is mounted, a central control means for forming a video signal for nine-screen synthesis and synthesizing the status in an area of a monitor screen in which a captured scene is not displayed may be provided.

As described above, by setting the number of standard digital video encoders to four, a surveillance camera unit capable of always monitoring a plurality of locations is provided. By adding an AD conversion board, a maximum of eight monitoring locations can be simultaneously monitored. It can be a surveillance camera unit capable of monitoring.
When an AD conversion board is added, at least 9 monitor screens are formed in order to form a video signal of 9 screen composite.
A video signal that does not display the captured scene can be formed in one-half the area. For this reason, a video signal for displaying the status is formed in the area of the monitor screen where the captured scene is not displayed, and even if the video is reduced to one-third vertically and horizontally, the status is easy to read, and In addition, it is possible to display an easy-to-view image that is not hidden by the status.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a surveillance camera unit of a surveillance camera system according to the present invention has a plurality of standard input jacks 81 on the back of a surveillance camera unit 20 and an additional input jack 77. The AD conversion board 70 provided with is provided.

As shown in FIG. 2, in addition to the power switch 91, a switch 93 for various settings is provided on the front of the monitoring camera unit 20.

Then, as shown in FIG. 3, the AD conversion board 70 fixes the digital video encoder as an additional digital video encoder 75 to the insertion board 71, and
Reference numeral 72 denotes an additional input jack 77 for inputting a video signal from a camera head unit serving as a surveillance camera, a simple output jack 83 for directly outputting a signal input to the additional input jack 77, and detection from a sensor 95. It has an additional alarm signal input pin 85 capable of inputting a signal, and a data output terminal 78 and a signal input terminal 79 at the rear end of the insertion board 71.

The AD conversion board 70 has a front cover plate.
Cover the insertion board 71 with a cover case 73 integrated with 72.
It is easy to insert and fix the D conversion board 70 from the board mounting port provided on the back surface of the surveillance camera unit 20 into the additional space, and when the AD conversion board 70 is inserted into the additional space, Surveillance camera unit with data output terminal 78 and signal input terminal 79 provided near the end
It transmits signals such as synchronization signals and digital video data to and from 20 internal circuits.

Further, a temporary cover 74 is attached to a board mounting port where the AD conversion board 70 is not inserted, so that the board mounting port in the additional space can be closed.

The AD conversion board 70 outputs a synchronizing signal to a camera head connected to the additional input jack 77 via a camera cable based on a reference synchronizing signal input from a signal input terminal 79. A video signal or the like input via a camera cable is subjected to digital signal processing by an additional digital video encoder 75, which is a digital video encoder for addition, and is output from a data output terminal 78 as an 8-bit luminance signal and color difference signal. .

The camera head connected to the AD conversion board 70 is connected to the AD conversion board via a camera cable.
The CCD is driven based on the reference synchronizing signal input from 70, and outputs a video signal or the like at a predetermined timing to the AD conversion board 70 of the monitoring camera unit 20 via a camera cable.

Further, as shown in FIG. 4, the body of the surveillance camera unit 20 on which the AD conversion board 70 is mounted
It has a central control means 41, which is a microcomputer, a frame memory 35, and the like, and a standard input jack 81, a standard digital video encoder 28, and the like.

The standard digital video encoder 28 uses the same digital video encoder as the additional digital video encoder 75 attached to the AD conversion board 70. The surveillance camera unit 20 includes four standard digital video encoders 28. A digital video encoder is provided so that each standard digital video encoder 28 can be connected to a monitoring camera serving as a standard camera head unit via a standard input jack 81.

The standard input jack 81 is connected to each standard digital video encoder 28 and connected to a simple output jack 83 via an amplifier 82.
The circuit configuration is the same as that of the AD conversion board 70 so that the signal input to the AD converter board 70 can be output to the simple output jack 83 as it is.

Also, as shown in FIG. 1, the same number of alarm signal input pins 85 as the standard input jacks 81 are provided on the back of the monitoring camera unit 20.

The standard input jack 81 is connected to the A
The same input jack 77 as an additional input jack attached to the D conversion board 70 is used. Furthermore, the camera cable for connecting the standard camera head and the standard input jack 81 and the camera cable for connecting the additional camera head and the AD conversion board 70 use the same standard camera cable. It is.

Therefore, each standard digital video encoder
28 can also output video signals etc. input from the standard input jack 81 as digital video data,
The output terminal of each standard digital video encoder 28 is connected to the selection selector 43 and the auxiliary selector 47,
When the AD conversion board 70 is inserted and fixed in the additional space, the output terminal of the additional digital video encoder 75 attached to the AD conversion board 70 is also connected to the selection selector 43 and the auxiliary selector via the data output terminal 78 of the AD conversion board 70. 47
It can be connected to.

The selection selector 43 is controlled by the central control means 41 and the write control means 37, and stores the digital video data output from each digital video encoder in a frame memory.
The digital video encoders 28 and 75 connected to the frame memory 35 when writing to the 35 are switched.

The central control means 41 detects the number of the standard digital video encoders 28 and the number of additional digital video encoders 75 for outputting digital video data, and if the number of operating digital video encoders is four or less, A pair of two digital video encoders is used as a set, and the writing control means 37 alternately switches the connection of the digital video data output from the two digital video encoders for each data of one horizontal scanning line to the frame memory 35. Control is performed to operate the selection selector 43 and the frame memory 35 so as to store the data.

When the number of operating digital video encoders is five or more, three digital video encoders are set as one set, and the digital video data output from the three digital video encoders is ,
The control for operating the selection selector 43 and the frame memory 35 is performed such that the connection is sequentially switched for each data of one horizontal scanning line and stored in the frame memory 35.

Accordingly, when the number of operating digital video encoders is four or less, the digital video data output from each digital video encoder is thinned by half the scanning line and the video captured by the two camera heads is taken out. 1 frame of video data obtained by combining
When the number of operating digital video encoders is 5 or more, the digital video data output from each digital video encoder is thinned out to one third by a scanning line, and the digital video data is output by three camera head units. One frame of video data obtained by synthesizing the data of the captured video is recorded in the frame memory 35.

The read control means 38 controls the main selector 45 and the frame memory while being controlled by the central control means 41.
If the number of operating digital video encoders is four or less, the digital video data is sequentially stored in the frame memory by performing pixel thinning such that the next one pixel of data is thinned out for each pixel. When the number of operating digital video encoders is 5 or more, pixel decimation is performed by one third so that data of one pixel is output from digital video data of three pixels. The digital video data is sequentially output from the frame memory 35.

The number of operating digital video encoders depends on the number of standard digital video encoders 28 and the number of clock signals whose timings match the reference synchronizing signal output via the data output terminal 78. This is determined by the central control means 41.

The digital video data output from the frame memory 35 is supplied to the main selector 45 and a character synthesizing circuit.
The digital video data input to the main digital encoder 53 and the auxiliary selector 47 via 59, is input to the main digital encoder 53, is synthesized with a synchronizing signal, is converted into a video signal, and is a synthesized output jack which is a main output terminal. It is output to 87 as a video signal.

Therefore, in a surveillance camera system in which four camera heads are provided and four digital video encoders are operated, the composite output jack of the surveillance camera unit 20
When a video signal of a four-screen composite is output to 87 and a monitor device 67 is connected to the composite output jack 87, an image obtained by dividing the screen into four on a monitor screen 68 is displayed as shown in FIG.
It is possible to simultaneously display the scenes shot by the two surveillance cameras.

As in the conventional surveillance camera system shown in FIG. 9, a sensor signal is input to the alarm signal input pin 85 of the surveillance camera unit 20 having the circuit configuration shown in FIG.
Connect 95, and the composite output jack 87 that is the main output terminal
By connecting the monitor device 67 to the monitor device 67 and the video device 69 to the select output jack 88 as an auxiliary output terminal, the detection signal of the sensor 95 can be centrally controlled by the alarm signal input pin 85 of the monitor camera unit 20. When input to the means 41, the scenes captured by the four surveillance cameras are simultaneously displayed, and the central control means 41 outputs necessary status information for displaying characters or graphic marks on the synthetic information forming means 57. The status information is output to the character synthesizing circuit 59 at a predetermined timing.

For this reason, in the character synthesizing circuit 59, the status information is added to a part of the digital video data input from the main selector 45, and the camera head section which shoots the installation location of the sensor 95 which outputs the detection signal. As shown in FIG. 5, characters such as "alarm" or an alarm mark are displayed on the image.

As status information, a video device 69 is connected to a selection output jack 88 as an auxiliary output terminal, and a video image taken by a specific camera head unit is recorded based on an operation of a switch 93 or an output of a sensor 95. When writing, the information for displaying the character or mark of “recording” or the operation of the switch 93 interrupts the writing of the image data from the specific digital video encoder, and the video data written to the frame memory 35 causes the still image to be displayed. Is displayed on the monitor screen 68. Character or mark information or the like is set in the composite information forming means 57.

The number of digital video encoders that operate by using five or six camera heads is five.
In the case where the number of images is six or six, the vertical and horizontal dimensions of the image can be reduced to one-third without changing the screen aspect ratio by changing the scanning line thinning and pixel thinning performed in writing and reading to the frame memory 35. Since a video signal of 9-screen synthesis to be compressed can be formed, as shown in FIG.
It is possible to display six screens arranged horizontally on three screens and vertically on two screens.

As described above, when five or six camera heads as surveillance cameras are provided, the combined information forming means 57
By adjusting the output timing of the status information to be output from the camera and displaying the status characters or marks in the margins of the monitor screen 68 that does not display the image of the scene shot by the camera head, the height and width are reduced to one-third each. While displaying the entire screen on the monitor screen 68, the status characters and marks can be displayed in a size that is easy to see.

By changing the timing at which the digital video data is read from the frame memory 35, the timing shown in FIG.
As shown in (2), scenes captured by five or six camera heads in two rows horizontally and three rows vertically can be simultaneously displayed, and the status can be displayed in the margin of the screen.

Further, the surveillance camera unit 20 forms digital video data of a scene photographed by each camera head unit by each digital video encoder, and
In order to compress the vertical and horizontal dimensions of the image to one-third by performing pixel thinning and scanning line thinning when writing and reading data to and from the memory, an additional space is provided for mounting five or six AD conversion boards 70, The number of the standard input jack 81 and the standard digital video encoder 28 is set to four or three,
A video signal that can be connected to up to nine camera head units and simultaneously displays nine screens can be formed.

It is to be noted that the total number of the standard digital video encoder 28 and the additional digital video encoder 75 is 7 or 8, and the surveillance camera unit 20 which can be connected to 7 or 8 surveillance cameras is shown in FIG. As shown, it is preferable to display a status by forming a margin in the center of the screen.

As described above, if the monitor screen 68 is divided into nine by the video signal of the nine-screen synthesis and the center is set as a margin area for status display, the status is displayed in a size that is easy to see, and the scene and the status are displayed. Since they do not overlap, the entire view of the reduced image can be visually recognized.

When the surveillance camera unit 20 can be connected to a maximum of eight camera heads,
As shown in Fig. 1 and Fig. 4, four standard input jacks 81 and four AD conversion boards 70 can be installed in the additional space, enabling connection with up to eight camera heads. And the number of the standard input jacks 81 and the standard digital video encoder 28 is three,
There may be an additional space in which up to five D conversion boards 70 can be mounted.

In this case, it is possible to provide a surveillance camera unit 20 that can use a surveillance camera system that monitors three locations as a standard and that can be a security camera system having up to eight surveillance cameras sequentially according to the location to be monitored.

An auxiliary selector 4 for enabling the output of each digital video encoder and the output of the main selector 45 to be selected.
7, and the auxiliary digital encoder 55 for converting the output of the auxiliary selector 47 into a video signal and the selection output jack 88 are not limited to one set as shown in FIG. Alternatively, there may be a plurality of sets such as three.

[0062]

According to a first aspect of the present invention, there is provided a standard input jack and a plurality of standard digital video encoders for forming digital video data from signals input to the standard input jack. And a plurality of AD conversion boards having a built-in additional digital video encoder for forming digital video data from a signal input to the additional input jack and outputting the digital video data to the data output terminal. The number of standard digital video encoders and the number of digital video encoders for expansion are detected, and the digital video data output by each of the standard digital video encoders and the AD conversion mounted via the data output terminal are provided. Multi-image by combining with digital video data output from the board A monitoring camera unit having a central control means for forming a video signal for displaying an image.

Therefore, by installing the AD conversion board, the number of camera heads connected to the monitoring camera unit can be increased, and the image of the scene captured by each connected camera head is displayed on the monitor device. can do.

According to a second aspect of the present invention, the number of standard digital video encoders is set to three or four so that the number of standard digital video encoders can be connected to nine or less camera heads. If the total number of digital video encoders is four or less, a video signal of four-screen synthesis is formed, and if the total number of digital video encoders is five or more, a video of nine-screen synthesis is detected. 2. The surveillance camera unit according to claim 1, which is a central control unit for forming a signal.

Accordingly, when connected to up to four surveillance cameras, a video signal of a four-screen synthesis is created by synthesizing the scenes captured by the connected camera heads, so that easy-to-view scenes at a plurality of surveillance locations are simultaneously displayed. Also, when monitoring more than five locations by increasing the number of connectable camera heads by increasing the number of AD conversion boards, a video signal of nine screens composed by combining scenes captured by each camera head is formed. In addition, it is possible to easily provide a surveillance camera system capable of simultaneously monitoring up to nine places by a camera head unit connected to the surveillance camera unit.

Further, according to the present invention, the number of the standard input jacks and the number of the standard digital video encoders are each four, and four AD conversion boards can be mounted.
2. The surveillance camera unit according to claim 1, further comprising: a control unit that forms a video signal of nine-screen synthesis when the D conversion board is mounted and synthesizes a status in an area where a scene is not displayed.

Therefore, it is possible to monitor four places by connecting to four camera heads by the standard input jack and the standard digital video encoder, and to simultaneously monitor up to eight places by adding an AD conversion board. When an image of a scene shot by each camera head is reduced and displayed to one-third in each of the vertical and horizontal directions by adding an AD conversion board, the status is displayed in a monitor screen area where the scene is not displayed. It is easy to set up a surveillance camera system that installs surveillance cameras according to the number of surveillance places, making it easy to see, and preventing the scene of the surveillance place from being hidden by the status, and suitable for surveillance. This is a surveillance camera unit that can be a surveillance camera system that can display images.

[Brief description of the drawings]

FIG. 1 is a rear view of a surveillance camera unit according to the present invention.

FIG. 2 is a front view of the monitoring camera unit according to the present invention.

FIG. 3 shows A attached to the surveillance camera unit according to the present invention.
The figure which shows a D conversion board.

FIG. 4 is a circuit block diagram of a surveillance camera unit according to the present invention.

FIG. 5 is a diagram showing an example of image display in the surveillance camera system according to the present invention.

FIG. 6 is a diagram showing a second example of image display in the surveillance camera system according to the present invention.

FIG. 7 is a diagram showing a third example of image display in the surveillance camera system according to the present invention.

FIG. 8 is a diagram showing a fourth example of image display in the surveillance camera system according to the present invention.

FIG. 9 is a block diagram showing an example of a conventional surveillance camera system.

FIG. 10 is a diagram showing an example of image display in a conventional surveillance camera system.

FIG. 11 is a block diagram showing a configuration example of a conventional surveillance camera system.

[Explanation of symbols]

 11-14 Camera head unit 20 Surveillance camera unit 21-24, 28, 75 Digital video encoder 31, 32, 35 Frame memory 37 Write control unit 38 Read control unit 41 Central control unit 43, 45, 47 Selector 51 Reference synchronization signal formation Means 53, 55 Digital encoder 57 Synthetic information forming means 59 Character synthesizing circuit 61, 63 Output terminal 65 Switcher 67 Monitor device 69 Video device 70 AD conversion board 71 Insert board 77, 81 Input jack 78 Data output terminal 79 Signal input terminal 82 Amplifier 83, 87, 88 Output jack 85 Alarm signal input pin 91, 93 Switch 95 Sensor

Claims (3)

[Claims] 1. A camera device comprising: a standard input jack for connecting to a camera head unit; and a plurality of standard digital video encoders for forming digital video data from signals input to the standard input jack. And an additional digital video encoder for forming digital video data from a signal input to the additional input jack and outputting the digital video data to the data output terminal. It has an extension space to allow a plurality of extension A / D conversion boards to be attached and detached, and further detects the number of the standard digital video encoders and the number of the extension digital video encoders and outputs the digital signals output by the standard digital video encoders. Video data and AD mounted via data output terminal A surveillance camera unit comprising central control means for synthesizing digital video data input from a conversion board to form a video signal for displaying a multi-screen video. 2. A surveillance camera in which the number of standard input jacks and standard digital video encoders is three or four, respectively, and an AD conversion board is mounted in an additional space so that nine or less camera heads can be connected. The unit detects the number of standard digital video encoders and additional digital video encoders, and when the total number of digital video encoders is four or less, forms a video signal of four-screen synthesis, and If the total number is 5 or more, a central control means for forming a video signal of 9-screen combination is provided.
The surveillance camera unit described in 1. 3. The number of standard input jacks and standard digital video encoders is four each, and there is an additional space for mounting four AD conversion boards, and when the AD conversion board is mounted, nine screens are synthesized. 2. The surveillance camera unit according to claim 1, further comprising central control means for forming a video signal and synthesizing a status in an area of a monitor screen on which a captured scene is not displayed.