JPH02280491A - Cctv monitor system - Google Patents

Abstract

PURPOSE:To attain scroll display and to avoid a sense of disorder given to a supervisor by mixing plural video digital data in response to the timing reading the plural video digital data stored in a storage means. CONSTITUTION:The system is provided with plural monitor cameras arranged to a prescribed position of a monitor area, changeover means 11-23 selecting video signals A-D by the monitor cameras and outputting them as one video signal, and a monitor displaying the video image in response to the video signal onto its screen, the changeover means 11-23 convert the video signal into a digital data, the data is stored, the stored data is read and mixed in a prescribed timing, the mixed digital data is converted into an analog signal as a video signal and the video signal is outputted onto a monitor. Thus, the plural video image signals of the monitor area are displayed on the monitor screen in terms of scroll and then revised thereby avoiding a sense of disorder to the supervisor and the entire monitor area is capable of being observed at a glance.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a CCTV system for monitoring a predetermined area or area.
(C1osed C1rcuit Te1evisio
n) CCTV related to a surveillance system, more specifically, a CCTV that scrolls and displays images from multiple surveillance cameras placed in a predetermined area or area on the screen of a monitor device.
This relates to a surveillance camera system.

C Conventional example] Conventionally, this type of CCTV monitoring system
It has the configuration shown in the figure, and includes a plurality of surveillance cameras 11, 1□, ...tln arranged at predetermined positions in the surveillance area,
A video switcher that switches video signals (NTSC signals) from those surveillance cameras 1□, 1□, ..., 1n.
2, and a monitor device 4 that displays images of the monitoring area and the like on a screen 3 using the switched video signals.

In other words, the screen 3 of the monitor device 4 allows a wide range of areas to be monitored.

By the way, in the above CCTV monitoring system, the screen 3 of the monitor device 4 has monitoring cameras 1□, 1. ,...1
Images by n are displayed in sequence, but they cannot be viewed at the same time, which is inconvenient for the monitor.
Furthermore, since the images are switched instantaneously, there is a problem in that it gives a sense of discomfort to the observer.

Therefore, as shown in FIGS. 42 and 43, for example, a method has been proposed in which the screen 3 is divided into sections and images from a plurality of monitoring cameras are displayed simultaneously.

[Problems to be Solved by the Invention] However, in the CCTV monitoring system described above, when the screen of the monitor device 4 is divided and displayed, images from a plurality of surveillance cameras can be viewed simultaneously, but when the number of divisions increases, There was a problem in that the divided and displayed images became smaller, making it difficult to see the images of the monitoring area and the like. In addition, since the number of divisions of the screen 3 is limited, when there are many surveillance cameras, the images must be switched, which ultimately makes it impossible to eliminate the sense of discomfort among the supervisors.

The present invention has been made in view of the above problems, and its purpose is to provide a CCTV monitoring system that allows users to view images from a plurality of monitoring cameras without feeling uncomfortable.

[Means for Solving the Problems] In order to achieve the above object, the present invention switches a plurality of surveillance cameras arranged at predetermined positions in a surveillance area and the video signals obtained by the surveillance cameras, and A CCTV monitoring system comprising a switching means for outputting as a video signal, and a monitor device for displaying a video corresponding to the video signal on a screen, the switching means including A for converting the video signal into digital data. /D conversion means, storage means for storing this digital data, mixing means for mixing these stored digital data, converting this mixed digital data into analog and converting it into a video signal (NT
SC signals), and when mixing the video signals from the plurality of surveillance cameras, the mixing ratio of the video signals is changed by changing the reading timing of the stored digital data. The gist of the present invention is to scroll and display the images captured by these surveillance cameras on the screen, or to update the images on the screen.

[Function] With the above configuration, when reading digital data of a plurality of videos stored in the storage means.

The digital data of the plurality of images are mixed according to the read timing. This mixed digital data is converted into an analog signal, converted into a video signal (NTSC signal), and output to a monitor device. If the mixed digital data consists of video A from a surveillance camera and video B from another surveillance camera, the screen of the monitor device will display the video A.
and video B are displayed separately. Therefore, if we change the readout timing and change the ratio of the digital data of video A and the digital data of video B.

For example, image A is first displayed on the screen, and then the portion of image A gradually decreases.

The portion of image B increases, and finally image B is displayed. That is, if the scrolling display of the video A and the video B is performed on the screen, for example, when the video from a surveillance camera is switched, the sense of discomfort given to the observer can be suppressed.

Incidentally, conventionally, the screen of a monitor device is displayed in a divided manner. Therefore, the above-mentioned scrolling display is performed on these divided screens. Then, images from more surveillance cameras will be displayed on one screen.

The entire monitoring area can be constantly monitored, which is extremely convenient for the monitor.

[Example] Embodiments of the present invention will be described below based on the drawings.

In Figure 1, the CCTV monitoring system includes multiple units,
In this embodiment, video signals (NT
Input buffer circuits 101.10.SC signals) A, B, C, and D are respectively input. , 103.10. and first and second selectors (analog selectors) 11. which switch between these video signals and output one of the video signals.
12 and an amplifier for amplifying the video signal switched by the first selector 11, removing noise, adjusting the level, etc.
Pre-processing circuit 1 consisting of a filter circuit, clamp circuit, etc.
3, a pre-processing circuit 14 having the same configuration as the pre-processing circuit 13, and a pre-processing circuit 14 for amplifying, removing noise and adjusting the level of the video signal switched by the second selector 12; An A/D converter 15 that converts the processed video signal into digital data, an A/D converter 16 that similarly converts the video signal processed by the pre-processing circuit 14 into digital data, and the A/D converter 15 that converts the processed video signal into digital data. a switch circuit 17 that alternately outputs the digital data converted by the A/D converter 15 from two output terminals OUT O and OUT 1 for each horizontal synchronization signal of the video signal, and the digital data converted by the A/D converter 16; 2 for each horizontal sync signal above
A switch circuit 18 that outputs alternately from output terminals 0υTo and 0UTI, IH memories 19 and 20 that store digital data from two outputs of the switch circuit 17 for each horizontal synchronization signal (IH), and two outputs of the switch circuit 18. digital data from each horizontal synchronization signal (I
A data selector 23 selects one of the digital data stored in the IH memories 19, 20, 21, 22, and converts the selected digital data into an analog signal (analog A D/A converter 24 for converting the analog signal into a video signal), and a D/A converter 24 for amplifying this analog signal, removing noise, and adjusting the output level, etc.
A post-processing circuit 25 consisting of an amplifier, a filter circuit, an output buffer circuit, etc. is provided.

Note that the above-mentioned manual buffer circuit 10. , 10□, 10
3. The 5YNC signal of the video signal input at 10° is synchronized.

Next, the operation of the CCTV monitoring system having the above configuration will be explained based on the time charts of FIGS. 2 to 5 and the screen diagrams of FIGS. 6 to 34.

First, video signals A, B, C, and D obtained by four surveillance cameras (not shown) are input to the human buffer circuit 10.
, 10t, 10. , 104 and input to the first and second selectors 11.12. Then, as shown in FIGS. 2(a) and (b), φ. ,φ,
The first and second selectors 11 according to the timing signal.
．． At step 12, two types of video signals are combined, for example, φ
. , φ, when the timing signals are "L", "L", the first selector 11 outputs the video signal A, and the second selector 12 outputs the video signal B.

Also, φ. , φ1 timing signal is #)l II,
In the case of "L", the first selector 11 outputs the video signal B, and the second selector 12 outputs the video signal C. These two types of video signals are passed through pre-processing circuits 13 and 14 to A/D converters 15 and 15, respectively.
16, and is converted into a digital signal (digital data) at the timing of the sample clock. The digital data of these images is transferred to the switch circuit 17.
18, and as shown in FIG. 3(a), φ2
The signals are alternately output from the output terminals OUT O and OUT 1 of the switch circuits 17 and 18 in accordance with the timing signal. That is, these digital data are output from the output terminal OUT O during the "L" period of the φ2 timing signal, and are output from the output terminal OUT l during the "H11 period" of the φ2 timing signal.

The digital data output from the switch circuit 17 is stored in the IH memory 19.2 at the timing of the sample clock.
The digital data output from the switch circuit 18 is alternately stored in the IH memories 21 and 22. At this time, as shown in FIG. 4(Q) and FIGS. 4(e) to (h), the IH memories 19 and 21 are in a write operation (W double write).

The IH memories 20 and 22 perform the reverse read operation (R: read), and the LH memories 19 and 21 perform the read operation (R: read).
In this case, the IH memory 20.22 performs a reverse write operation (W: read), and the width of the φ2 timing signal is one period of the horizontal synchronization signal (IH).

The IH memories 19, 20, 21, and 22 each store video digital data corresponding to one period of the horizontal synchronizing signal, and are read out in the next one period.

Therefore, the first and second selectors 11゜12
When video signals A and B are selected in , the digital data of video A (screen 3
(1 scanning line of screen 3) is stored in the IH memory 19, and digital data of video B (1 scanning line of screen 3) is stored in the IH memory 21. continue.

In the next period (IH), the digital data of the video A (one scanning line of the screen 3) is stored in the IH memory 20, and the digital data in the IH memory 19 is read out. Further, the digital data of the video B (one scanning line of the screen 3) is stored in the IH memory 21, and
Digital data in the IH memory 20 is read out. That is, fH memory 19.21 and IH memory 20.
22, the write operation and read operation are repeated every one period (1H), so the IH memory 19.20
, the digital data of image A is continuously obtained,
In the IH memories 21 and 22, digital data of the image B is continuously obtained.

The digital data of images A and B are input to the data selector 23, and as shown in FIG. 3(b) and FIG. Switching is performed, and the switching operation is performed within one period of the horizontal synchronization signal (
IH).

41 L 7 level period of φ3 timing signal (p, p
At □9P2 time), the digital data of video A is output, and during the "H"" level period, Q, 02 time), the digital data of video B is output. Those images A
The mixed digital data of image B and image B is input to the D/A converter 24, and converted into an analog signal at the timing of the sample clock. Furthermore, as shown in FIG. 4(i), the mixed analog signals of video A and video B are input to the post-processing circuit 25, and one video signal (NT
When this video signal (SC signal) is input to the monitor device 4 (shown in FIG. 41), the screen 3 displays the video A.
and video B are displayed at the same time, and the timing signal is "L".

It is divided according to the “H” level period ratio. Therefore, as shown by the two-dot chain line in FIG. 3(b), the above φ,
By changing the ratio of the "L II , II ) (" level period of the timing signal, the ratio of video A and video B included in the above output video signal can be changed, and the ratio of video A and video B displayed on screen 3 can be changed. The ratio can be changed.

Therefore, as shown in FIG. 5, the "'L" level period (P) of the φ3 timing signal is decreased for each period of the vertical synchronization signal. 'H
``Increasing the level period (Q) (Q2.Q,...
, Q, ), the output video signal initially contains only video A, but as the amount of video A gradually decreases, it includes more video B, and finally only video B is included.

That is, on one screen 3, video A is displayed for each vertical sync signal.
and image B are displayed in a divided manner, and as the area of image A decreases, the area of image B increases, and finally image B is displayed, that is, images A and B are scrolled and displayed.

More specifically, as shown in FIGS. 6, 7, 9, and 10, video A is stored in IH memory 19.20, and video B is stored in IH memory 21.22.
is stored, and furthermore, the above-mentioned φ and the timing signal JI
It is assumed that the "L" level period CP) is decreased and the "lHl" level period Q) is increased. In this case, the above IH
During the read operation (R) of memory 19.20, the above φ
, Corresponding to the decrease in the "L" level period (P) of the timing signal, the start address address a moves to the right on the screen 3, for example, every vertical synchronization signal (every scroll), and the IH memories 21 and 22 During the read operation (R) of
According to the increase in the "H" level period of the timing signal, the address of the end address (the last address read) is changed, for example, to the screen 3 every vertical synchronization signal (every scroll).
to move to the right. Then, as shown in FIGS. 8 and 11, the output video signal (NTS
C signal) is a mixture of video A and video B, and the mixing ratio is such that video A decreases for each vertical synchronization signal.
Since the amount of video B increases, the screen 3 initially displays video A, but the display area for video B gradually increases, and finally video B is displayed. That is, screen 3
At the top, video A and video B are scrolled to the left.

Further, as shown in FIGS. 12 to 17, the end address C of the IH memories 19 and 20 moves to the left on the screen 3 for each vertical synchronization signal, and the IH memories 21 and 2
For example, the end address of No. 2 is moved to the right on screen No. 3 every time a vertical synchronizing signal is received. Then, as shown in FIGS. 14 and 17, on screen 3,
Screen 3 is updated so that the area for image A is smaller and the area for image B is larger, and image A is initially displayed.

Finally, video B is displayed. That is, on one screen 3, video A and video B are updated to the left.

Furthermore, as shown in FIGS. 18 and 23, the above-described leftward scroll display can be reversed, and in this case, the start address d of the IH memories 21 and 22 is changed to the screen 3 for each vertical synchronization signal. The end address C of the IH memo U19, 20 is moved to the left on screen 3 every vertical synchronization signal, for example. Then, as shown in FIGS. 20 and 23, screen 3
Now, contrary to the scroll display described above, video B and video A are each scrolled to the right.

Furthermore, as shown in FIGS. 24 and 29, the above-described leftward screen update display can be reversed, and in this case, the start address d of the IH memories 21 and 22 is
For example, moves to the right on screen 3 for each vertical synchronization signal, and
The start address a of the memories 19 and 20 is moved to the left on the screen 3, for example, every vertical synchronization signal. Then,
As shown in FIGS. 26 and 29, on screen 3, contrary to the screen update display described above, the screen is updated every vertical synchronization signal, and video A is displayed first, but video B is displayed from the left side. The image A and image B are then updated, and finally image B is displayed.

In the above-described embodiment, the above φ, the It L #j level period (P), and the 'H'' level period (Q) of the timing signal are constant in one period of the vertical synchronization signal. In one period of the signal, its φ, the “L” level period (P) of the timing signal, and the “H” level period (Q) of the timing signal.
may be changed. Then, as shown in FIGS. 30 to 32, the boundary line between video A and video B is shaped into an arbitrary shape (
(rectangular, curved line, etc.), and video A and video B will be scroll-displayed and the screen will be updated while keeping this boundary line. Further, the time until image A on screen 3 changes to image B, that is, until one scroll or one update is completed, can be arbitrarily changed by changing the pulse of the horizontal synchronizing signal.

Furthermore, if a function is provided to wait for a predetermined time after one scroll or one screen update, the next scroll or screen update can be started after an arbitrary time.

Furthermore, the above φ. , φ, the level of the timing signal (
(shown in Figure 2), images A, B, C,
D can be combined for scrolling display or updating.

Further, in the above embodiment, the case where there is one screen 3 has been described, but the present invention can also be applied to a case where the screen 3 is divided into a plurality of parts as shown in FIGS. 33 and 34.

In this case, the above-mentioned scrolling display or screen updating can be performed using one, a plurality of screen divisions, or all two screen divisions.

In this way, the image on screen 3 or its divided screens can be scrolled and displayed, or updated, so the monitor does not feel uncomfortable, and even if there are many surveillance cameras, it is possible to All the images can be displayed simultaneously on the screen 3 of 4 (shown in FIG. 34), and there is no need to make the images so small, making it easier for the observer to monitor.

Next, the IH memory 19, 20, 21, 22 of the above embodiment
A modification example in which four field memories (not shown) are used instead of the above will be explained based on FIGS. 35 to 40. Note that the operations of these field memories, that is, write (W) and read operations (R) are carried out by the 1H memory 19.
, 20, 21.22.

Here, it is assumed that images A and B shown in FIG. 35 and FIG. 36 are stored in the field memory, respectively. In this case, the readout time of these field memories is N
M corresponds to P and Q (one period of the horizontal synchronizing signal) in the above embodiment. Note that the read time N1.
M is changed to one period of the vertical synchronization signal. Then, as shown in FIG. 37, the readout time N1. is displayed on the screen 3 of the monitor device 4. Videos A and B are divided and displayed according to M. Furthermore, as shown in FIGS. 35, 36, 38, and 39, the readout time N1. If Ml is changed to N,,M, the image A is obtained.

The display ratio of B can be changed. Therefore, if the readout time is changed at predetermined intervals, for example, by decreasing time N1 and increasing time M, video A will be displayed first on screen 3, but the proportion of video B will gradually increase. , and finally video B is displayed. In other words, video A and video B
will be displayed by scrolling upwards. Although not shown, when changing the readout time, if the readout time is reversed, images A and B will be scrolled downward. Note that the configuration of other parts in this example,
Since the operation is similar to that of the previous embodiment, the explanation thereof will be omitted.

Further, two frame memories may be used instead of the four field memories described above. In this case, the read operation timings of these frame memories are set to the P, Q, and start addresses in the above embodiment.

By combining the end address, N, and M, various images can be scrolled and updated on the screen 3.

In the above embodiment, the image displayed on the screen 3 of the monitor device 4 may be either a still image or a moving image.

[Effects of the Invention] As explained above, according to the present invention, video signals from a plurality of surveillance cameras disposed at predetermined positions in a surveillance area and those from the other surveillance cameras are switched and output as a single video signal. A CCTV monitoring system comprising a switching means for converting the video signal and a monitor device for displaying an image on a screen according to the video signal, the switching means converting the video signal into digital data and storing it, and converting the stored data into digital data. are read out and mixed at a predetermined timing, and this mixed digital data is converted to analog to form a video signal (NTSC signal),
Since this video signal is output to a monitor device,
This is because multiple images of the monitoring area can be scrolled and displayed on the screen of the monitor device and updated.

This eliminates the sense of discomfort for the monitor, and allows the viewer to see the entire monitored area at once.Furthermore, when displaying multiple images on a separate screen, the images can be scrolled on the split screen. This has the effect that images from more surveillance cameras can be displayed on the screen of a single monitor device.

[Brief explanation of drawings]

FIG. 1 is a schematic partial block diagram of a CCTV monitoring system showing one embodiment of the present invention, and FIGS. 2 to 5 are
Schematic time chart diagrams for explaining the operation of the CTV monitoring system, FIGS. 6 to 34 are schematic screen diagrams of the monitor device, and FIGS. 35 to 40, for explaining the operation of the CCTV monitoring system. 41 is a schematic block diagram of a conventional CCTV monitoring system, and FIGS. 42 and 43 illustrate the operation of FIG. 41. It is a schematic screen diagram of the monitor device for explanation. In the figure, 1□, 1. ,..., 1n is a surveillance camera, 3 is a screen (of monitor device 4), 4 is a monitor device, 10z, 10
□. 103.10. is an input buffer circuit, 11 is a first selector, 12 is a second selector, 15.16 is an A/D converter, 17.18 is a switch circuit, 19, 20, 21.2
2 is IH memory, 23 is data selector, 24 is D/A
It is a converter. Patent Applicant Fujitsu General Corporation Agent Patent Attorney Takuya Ohara Figure 12 Figure 15 Figure 13 Figure 14 Figure 16 Figure 17 Figure 24 Figure 27 Figure 18 Figure 19 Figure 21 Figure 22Figure 25Figure 26Figure 28Figure 29Figure 20Figure 23Figure 41Figure 42Figure 43

Claims (3)

[Claims] (1) A plurality of surveillance cameras arranged at predetermined positions in the surveillance area, a switching means for switching the video signals obtained by the surveillance cameras and outputting them as one video signal, and a screen that displays the video according to this video signal. A CCTV monitoring system consisting of a monitor device for displaying a digital image, wherein the switching means includes an A/D conversion means for converting the video signal into digital data, a storage means for storing this digital data, and a storage means for storing the digital data. A mixing means for mixing the mixed digital data, and a D for converting the mixed digital data into analog to form a video signal (NTSC signal).
/A conversion means, when mixing the video signals from the plurality of surveillance cameras, by changing the reading timing of the stored digital data, the mixing ratio of the video signals is changed, and the video signals from the surveillance cameras are mixed. A CCTV monitoring system characterized in that the image being taken is scroll-displayed on the screen or the image on the screen is updated. (2) The CCTV monitoring system according to claim (1), wherein when dividing a plurality of images onto the screen of the monitor device, the images are scroll-displayed on the divided screen. (3) The CCT according to claim (1), wherein the scroll display moves the image to the right, left, top, or bottom of the screen.
V monitoring system.