JPS62265880A - Monitor device - Google Patents

Abstract

PURPOSE:To save power and to prolong the service lives of television cameras in terms of a monitor device using plural television cameras by stopping the supply of a power source to an unnecessary television camera after the prescribed time passes. CONSTITUTION:After the prescribed time has passed since a point when the 2nd switch circuit 11 selects any one of plural television cameras 1, the supplly of a power source to unnecessarly television cameras 1 apart from the selected one and a one that the 1st switch circuit 33 selects is stopped. Thus power can be saved, and moreover the service lives of the television cameras 1 can be prolonged compared with a case where a power source is supplied always. Since a power source is supplied to all the television cameras 1 before the prescribed time passes, picture deterioration due to an unstable rise never occurs when the 2nd switch circuit 11 selects the other television cameras 1.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem (Fig. 1) F. Effect G. Example G1. Description of test G2. Power supply control Description H Effects of the Invention A Industrial Application Field The present invention relates to a monitoring device using a plurality of television cameras.

B. Invention (Existing Invention) The present invention achieves power saving and power saving in a monitoring device using a plurality of television cameras by stopping power supply to unnecessary television cameras after a predetermined period of time has elapsed. This is intended to extend the lifespan of the television camera.

C. Conventional technology Conventional monitoring devices that use infrared rays to detect anomalies have been proposed, but even if an anomaly is detected, it is difficult to tell what kind of situation has occurred until you are there. Moreover, there was the inconvenience that no evidence remained.

Therefore, conventional monitoring devices using a television camera and a monitor have been proposed.

D. Problems to be Solved by the Invention However, in the conventional monitoring device that uses a television camera and a monitor as shown in the figure, it is necessary for a person to monitor the device.
Video tape recorders (video tape recorders) perform frame-by-frame recording, so there is a risk that important scenes may be missed.

The present invention provides a monitoring device that eliminates the above-mentioned drawbacks, and is particularly intended to save power and extend the lifespan of television cameras.

E. Means for solving the problem (Fig. 1) The present invention has the following features:
A plurality of television cameras (1), an image processing unit (30) that receives output signals from the plurality of television cameras (1) via a first switch circuit (33) and detects changes in images; An alarm generating circuit (24) generates an alarm based on the output signal of the processing unit (30), and a second switch circuit (11) generates an alarm based on the output signal of the plurality of television cameras (1).
) and a printer section (40) that prints an image based on the output signal of the second switch circuit (11) based on the output signal of the image processing section (30); The present invention is based on a monitoring device that is supplied with an output signal and has a monitor (6) that displays an image based on the output signal. In the present invention, a power supply control circuit (28) is provided to control the power supply to the plurality of television cameras (1), and one of the plurality of television cameras (1) is connected to the second switch circuit (11). At the time of selection, power is supplied to all of the plurality of television cameras (1), and after a predetermined period has elapsed from this selection time, the selected television camera (1) and the first switch circuit (33)
The power supply to the television cameras (1) other than the television camera (1) that can be selected is stopped.

F Function In the above configuration, after a predetermined period from the time when one of the plurality of television cameras (1) is selected by the second switch circuit (11), unnecessary television cameras, that is, the selected television camera (1) and the second television camera (1) are switched off. Power supply to the television cameras (1) other than the television camera (1) that can be selected by the switch circuit (33) of No. 1 is stopped. This saves power and extends the lifespan of the television camera (1) compared to those that are constantly supplied with power. In addition, in the above configuration, since power is supplied to all television cameras (1) before the predetermined period has elapsed, other television cameras (1) are selected by the second switch circuit (11) within this period. When this happens, image deterioration due to instability in rising and the like does not occur.

G. Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIG.

In the figure, (1) is a television camera, and a video signal Sv from this television camera (1) is transmitted via a line AV to a switch circuit (1) constituting a switcher part (10).
1). In addition, (2) is a TV camera (11
The microphone (3) attached to the is a conventionally well-known sensor that uses infrared rays or the like. The detection signal (DC signal) Ss of the sensor (3) is sent to the microphone (2) by the superimposing circuit (4).
), the output signal of the superimposing circuit (4) is fed via line 2a to the switcher part (10), and the audio signal SA from The signal SA is supplied to a switch circuit (12) and a DC detection signal Sli is separated within this switcher part (10).

is supplied to the alarm input terminal of the CPU (Central Processing Unit) (13).

Figure 1 also shows a TV camera +11 and a microphone (
Although only one channel (one set) of sensor (2) and sensor (3) is shown, for example, a total of eight channels (eight sets) are provided and each is connected in the same manner as described above. Therefore, the switch circuit (11) receives video signals Sv from 8 channels of television cameras (11) arranged at different locations.
are supplied in parallel, and the switch circuit (12) receives audio signals S^ from each of the eight channels of microphones (2).
are supplied in parallel, and detection signals S8 from the respective sensors (3) of eight channels are supplied in parallel to the alarm input terminal of the CPU (13).

Furthermore, the switching of the switch circuits (11) and (12) is controlled by the CPU (13) based on the user's operation on the control panel (5). For example, the second
The figure shows the top of the control panel (5), and by pressing the channel selection switches (71) to (78), the switch circuits (11) and (12) are switched to the selected channel. In addition, by pressing the auto scan switch (51), the switch circuit (
11) and (12) are sequentially switched to other channels. In this case, channels to be sequentially switched (auto scan channels) are selected as follows.

First, the auto scan switch (51) is pressed. At this time, channel selection switches (71) to (7
If you press each of 8) in succession, that switch part will light up.
The auto scan switch (51) is released from the pressed state so that the channel selection switch portions of the channels that need to be sequentially switched are lit, although they are repeatedly turned off.

As a result, the channel corresponding to the lit channel selection switch is selected as the auto scan channel.

Note that channels whose functions are turned off by the function selection switch described later cannot be selected.

Also, the video signal S output from the switch circuit (11)
v is supplied to an adder (14). This adder (14)
The character signal generator (1) is controlled by the CPU (13).
5) A character signal indicating the date, time and channel is supplied and added to the video signal Sv. The video signal SV to which this character signal has been added is supplied to the fixed terminal on the A side of the selector switch (17) via the gate circuit (16), and is supplied to the fixed terminal on the B side of the selector switch (17) via the gate circuit (16). A video signal Sv' is supplied from a video signal input terminal (18V), and the video signal obtained from this changeover switch (17) is supplied to a video signal output terminal (20v) via an amplifier (19).

Also, the audio signal s output from the switch circuit (12)
A is supplied to the fixed terminal on the A side of the changeover switch (21), and the fixed terminal on the B side of this changeover switch (21) receives the audio signal S^' from the external audio signal input terminal (18A).
is supplied, and the audio signal obtained from this changeover switch (21) is passed through an amplifier (22) to an audio signal output terminal (2
0A). In addition, amplifier (19), (
The video signal and audio signal output from 22) are supplied to the monitor (6).

The switching of the changeover switch <17), (21) is controlled by the CPU (13) based on the user's operation on the control panel (5).For example, the external selection switch (53) in FIG. 2 is pressed. As a result, the changeover switches (17) and (21) are sequentially and alternately connected to the A side and the B side. Changeover switch (17).

(21) is connected to the A side, an image based on the video signal Sv is displayed on the monitor (6), and an audio signal Sv is displayed on the monitor (6).
A sound is generated by ^. On the other hand, the changeover switch (17
) and (21) are connected to the B side, an image based on the video signal Sv' is displayed on the monitor (6), and a sound based on the audio signal S8' is generated.

Further, the video signal Sv from each of the 8 channels of television cameras + 1) is passed through an adder (23) to an image processing unit (3).
0) is supplied to the binarization circuit (31) and the synchronization separation circuit (32). The video signal SV2 binarized by the binarization circuit (31) is supplied to the switch circuit (33), and the synchronization signal SS)'tic separated by the synchronization separation circuit (32) is supplied to the switch circuit (34). be done. Switching of these switch circuits (33) and (34) is controlled by the CPU (35). In this case, only the sensing channel among the eight channels is sequentially switched. This sensing channel is a channel in which the "print" or "alarm" function is selected. Selection of such functions is performed by function selection slide switches (91) to (98) provided on the control panel (5) as shown in FIG.

Here, the "print" function refers to the image processing unit (30)
This is a function that generates an alarm and prints out the image of that channel when an image change is detected in the image processing unit (30).
This function generates an alarm when a change in the image is detected. Furthermore, during the "monitor" function, the image processing section (30) does not detect the above-mentioned image change, and therefore neither generates an alarm nor prints out the image of that channel. In addition, the switching of the switch circuits (33) and (34) is, for example, 1
This is done at a cycle of /30 to 1/60 seconds.

Further, the video signal SV2 from the switch circuit (33) is supplied to a serial/parallel conversion circuit (36) consisting of, for example, a shift register. In addition, the switch circuit (34)
The synchronization signal 5sync from the address comparator (3
7), a position address is formed from this synchronization signal 5sync, and is compared with a designated position address supplied from the CPU (35). When a match occurs, a match pulse Pa is supplied from the address comparator (37) to the conversion circuit (36), the shift operation in the conversion circuit (36) is stopped, and the data in the shift register is transferred to the CPU ( RAM (35) via RAM (3
8) is written to the specified address. The specified position address from the CPU (35) is changed sequentially, and
As much data as necessary is written to.

Further, reference data based on the video signal SV2 when there is no change in the image is written in advance in the RAM (38).

The above operations are performed for each sensing channel. Then, the CPU (35) compares the reference data with the current data that will be sequentially written into the RAM (38) for each of the sensing channels, and if there is a change of more than -window, for example, 4 bits/ image (dyeing liquid alarm output signal SAL)
is output. Of the 4 bits, 3 bits are channel data and 1 bit is alarm data. Furthermore, C.P.
U (35) is made to operate by a program in ROM (39).

Further, the alarm output signal SAL from the CPU (35) is supplied to the alarm input terminal of the CPU (13).

When the alarm output signal SAL is supplied, the CPU (13
) outputs a signal Sc, and this signal Sc triggers an alarm generation circuit (24) consisting of a buzzer or a lamp.
is driven, and this signal Sc is supplied to the external alarm output terminal (25).

Further, when the alarm output signal SAL is supplied, the switch circuits (11) and (12) are switched to the corresponding channel, and the changeover switch (17) is also switched.

(21) is forcibly connected to the A side even when connected to B 1llJ. Then, an image based on the video signal Sv of the corresponding channel is displayed on the monitor (6). In addition, the printer trigger signal S is sent from the CPU (13).
TR is supplied to the CPU (41) of the printer section (40) via the trigger control circuit (26). CPU
When the trigger signal STR is supplied to (41), the memory control circuit (42) is controlled, and the video signal Sv of the corresponding channel from the amplifier (19) is converted into a digital signal by the A/D converter (43). video memory (4
4) is written for one field. The video memory (44) is then controlled by the memory control circuit (42).
), the data is sequentially read out from the printer head (4).
5), the printer motor (46) is driven, and the image of the corresponding channel is printed out.

Note that the video memory (44) has, for example, four field memories, and even when four trigger signals STR are continuously supplied to the CPU (41), the video memory of each corresponding channel is stored. Each signal Sv is written for one field into the video memory (44). When the printout is not completed and all four field memories are used, the CPU (41) sends the printer busy signal sp to the trigger control circuit (26).
s is supplied, and the trigger signal STR is not supplied to the CPU (41).

In addition, the above-mentioned alarm output signal SAL is sent to the CPU (13).
Although the description has been made for the case where the detection signal S8 is supplied, the same operation is performed also when an image change is detected by the detection signal S8.

By the way, the threshold level Eo in the binarization circuit (31) of the image processing section (30) is set to It is necessary to set correctly for each channel depending on the level of the signal Sv. When the video signal Sv is at a level as shown by the solid line in FIG. 3A, the threshold level EO is set to be approximately the middle level of the video signal SV, for example, as shown by the broken line in FIG. 3A. At this time, the video signal SV2 from the binarization circuit (31) becomes as shown in FIG. Setting of this threshold level Eo is performed for each channel as follows.

First, a setting mode is selected using the slide switch (54) of the control panel (5) shown in FIG. At this time, the switching switch (
17) and (21) are connected to the A side, and the monitor (
6) is supplied with a video signal Sv via a gate circuit (16), and an image based on this video signal Sv is displayed.

Next, by pressing the channel selection switches (71) to (78), the channel to which the threshold level Eo is to be set is selected. At this time, under the control of the CPU (13), the switch circuit (11) of the switcher part (10)
, (12) and the switch circuits (33) and (34) of the image processing section (30) are switched to the selected channels, respectively.

In this case, the gate circuit (16) is controlled by the CPU (13) and gates the video signal Sv from the adder (14) with the binarized video signal SV2 from the switch circuit (33). . Incidentally, during normal operation, this gate circuit (16) is configured to pass the video signal Sv from the adder (14) as it is.

Therefore, the video signal Sv from the adder (14) is
As shown in the solid line in Figure A, on the other hand, the switch circuit (33
) is as shown in Figure B, the gate circuit (16) outputs a video signal Sv as shown in Figure C, which is supplied to the monitor (6).
An image based on this will be displayed.

Next, the threshold level Eo is set by rotating the controls (81) to (88) for setting the threshold level Eo arranged corresponding to each channel on the control panel (5). When adjusted, the video signal SV2 changes, the video signal Sv from the gate circuit (16) changes, and the image on the monitor (6) changes. Therefore, while observing the image on the monitor (6), the threshold level EO is adjusted, for example, as shown by the broken line in FIG. 3A. At this time, the image on the monitor (6), for example, has approximately half bright parts and dark parts.

Next, when the operating mode is selected using the slide switch (54), the operating state is restored.

Explanation of GL test Also, as mentioned above, when there is a change in the image of the sensing channel, the image processing unit (30) outputs the alarm output signal SAL, and the alarm generation circuit (24) generates an alarm, or Although the image of the channel is printed out, it is necessary to check (test) whether the image processing section (30) operates normally. In this example, it is configured to be performed either manually or automatically.

That is, to perform manual testing, use the Control Panel (
5) Press the test switch (55). At this time, the noise generation circuit (27) is controlled by the CPU (13), and the noise SN from this noise generation circuit (27) is added to the video signal Sv from the 8-channel television camera (1) in the adder (23). The sum is added and supplied to the binarization circuit (31). Then, the switch circuits (11) and (12) of the switcher part (10) and the image processing section (30
) switch circuits (33) and (34) are synchronously switched to each of the sensing channels sequentially at a predetermined period.

If the noise SN is added to the video signal Sv, the image will be in a pseudo-changed state, so if the image processing unit (30) is operating normally, the CPU (35) will issue an alarm as described above. Although the output signal SAL is output, if the image processing section (30) is not operating normally, CP[
Alarm output signal SAL is not output from J(35).

In addition, the test switch (5) on the control panel (5)
5), the changeover switches (17) and (21) are connected to A11 under the control of the CPU (13).

In addition, in response to the sequential switching to each sensing channel, a printer trigger signal STR is sequentially supplied from the CPU (13) to the CPU (41) of the printer section (40) via the trigger control circuit (26). At the same time, in addition to character signals representing the date, time, and channel, the character signal generator (15) outputs an rNG signal when an alarm output signal SAL is output on that channel, and when "OK" is not output.
A character signal representing J is generated and added to the video signal Sv in an adder (14). Therefore, corresponding to each sensing channel, the monitor (6)
An image with "OK" or rNGJ superimposed thereon is displayed, and the printer section (40) prints an image with "OK" or rNGJ superimposed thereon.

Incidentally, when the above-mentioned operation is completed in each of the sensing channels, the commuting operation state is restored.

When rNGJ is displayed, it means that the image processing unit (30) is not operating normally in that channel, so for example, the threshold level Eo of the above-mentioned binarization circuit (31) should be set again. become.

Next, in the automatic test, the same operation as the above-mentioned manual test is automatically performed every fixed period, for example, every 10 days.

FIG. 4 shows a rough flowchart of the operation of the example in FIG. 1, including the above-mentioned manual test and automatic test operations. Incidentally, when the monitoring device shown in FIG. 1 is operated by a timer, it is possible that the power is turned off during an automatic test, so in that case, the power is turned on and the power is turned off after operation.

Explanation of G2 power supply control Also, in Fig. 1, (7) is a power supply circuit, and this power supply circuit (7) provides the necessary power for the switcher part (10), the image processing part (30), and the printer part (40). Power is supplied. Also, 8 channel TV camera (1)
Power is supplied to the switcher part (10) via a power control circuit (28). This power supply control circuit (28) is controlled by the CPU (13),
The supply of power to the 8-channel television camera (1) is controlled as follows.

First, when the power is turned on, the function selection switches (91) to (
98), power is supplied to the television cameras (1) of all channels whose functions are not turned off, and at this time, the youngest channel among them is selected (manual mode). In this state, the channel selection switch (71
) to (78) are not pressed, after a predetermined period of time has elapsed,
The power supply to the TV camera (1) of the youngest channel and the TV camera (11) of the sensing channel will be stopped.In addition, the channel selection switch (71 ) to (78) are pressed, the above-mentioned predetermined period starts anew from the time of selection.In this state, if the channel selection switches (71) to (78) are not pressed within the predetermined period, the predetermined period is After the period has elapsed, power supply to the TV camera (1) of the selected channel and the other TV cameras (1) except the sensing channel TV camera (11) is stopped. Also, after a predetermined period, the channel selection switch ( When buttons 71) to (78) are pressed, power is supplied to all television cameras [11] again, and the same operations as described above are performed. FIG. 5 is a flowchart showing this operation.

Also, when the auto scan switch (51) is pressed (
In the auto scan mode), power supply to the TV cameras (1) other than the TV cameras (1) of the auto scan channel and the sensing channel is stopped. FIG. 6 is a flowchart showing this operation.

The monitor (6) also has a power control circuit (28).
) is supplied with power.

In addition, in the control panel (5) shown in Fig. 2, (56) is a power switch, (57) is a switch for pulling out the print paper of the printer section (40), and (57) is a switch for pulling out the print paper from the printer section (40).
8) is a switch for causing the printer section (40) to print the image of the video signal supplied at that time; (59);
(60) is a switch for printing the image of the video signal written in the video memory (44), and (60) is a switch that is set or set to automatically print the image when the alarm output signal SAL is output as described above. A switch for canceling this, (61) is a switch for setting or canceling the timer operation, (62) is a switch for setting or canceling the alarm generation circuit (24). switch, (
63) is a light emitting diode that constitutes the alarm generation circuit (24), (64) is an operator that configures the alarm generation circuit (24), for example, sets the volume of a buzzer, and (65) sets the detection range of image change. A group of switches for (6
6) is a group of switches for setting the time or timer.

In this example described above, for example, 10
Since it is automatically checked on a daily basis whether the image processing section (30) operates normally, it is possible to perfect the operation of the image processing section (30).

In addition, since the printer section (40) also operates when it is automatically checked in this way, the printer section (40) also operates.
There is also the benefit of checking whether 40) is working properly.

In addition, in this example, the switch circuit (11) of the switcher part (10),
Since the switching period (12) can be freely set by the user using the operator (52) on the control panel (5), usability can be improved. Furthermore, when the image processing section (40) outputs the alarm output signal SAL, the switch circuit (11).

(12) is switched to the corresponding channel, and the image of this channel is displayed on the monitor (6), so there is no equivalence problem.

In addition, in this example, the power supply to the television camera (1) is controlled by the power supply control circuit (28), and the power supply to unnecessary television cameras (11) is stopped, thereby saving power. At the same time, it is possible to extend the lifespan of the television camera, especially the image sensor.In addition, in manual mode, for a predetermined period of time,
For example, power is kept supplied to all TV cameras (1) for 30 seconds, so when selecting another channel within this period, there will be no image deterioration due to unstable start-up, etc., and the user will feel uncomfortable. There is a benefit in that it does not give

H Effects of the invention According to the invention described above, the power supply to the television camera is controlled by the power supply control circuit, and unnecessary power supply to the television camera is stopped, thereby saving power. At the same time, it is possible to extend the life of the television camera.

Also, since power is maintained to all TV cameras during the specified period, other channels (
When selecting a television camera), there is an advantage that there is no image deterioration due to start-up instability, and there is no discomfort to the user.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a control panel, and FIGS. 3 to 6 are diagrams for explaining the operation of the example shown in FIG. +11 is a TV camera, (6) is a monitor, (7) is a power supply circuit, (10) is a part of a switcher, (11) (1
2) (33) and (34) are switch circuits, (13)
) and (35) are a CPU, (24) is an alarm generation circuit, (27) is a noise generation circuit, (28) is a power supply control circuit, (30) is an image processing section, and (40) is a printer section.

Claims (1)

[Claims] A plurality of television cameras, an image processing section for detecting a change in an image to which the output signals of the plurality of television cameras are supplied via a first switch circuit, and an alarm generation circuit that generates an alarm based on the output signal of the plurality of television cameras, and an output signal of the second switch circuit that is supplied with the output signals of the plurality of television cameras based on the output signal of the image processing section; A power source that controls power supply to the plurality of television cameras in a monitoring device that includes a printer unit that prints images, and a monitor that is supplied with an output signal of the second switch circuit and displays images based on the output signal. A control circuit is provided, and when one of the plurality of television cameras is selected by the second switch circuit, power is supplied to all of the plurality of television cameras, and when the second switch circuit selects one of the plurality of television cameras, power is supplied to all of the plurality of television cameras. A monitoring device characterized in that power supply to the television cameras other than the television camera selected by the first switch circuit and the television camera selected by the first switch circuit is stopped.