JPH05215865A - Monitor - Google Patents

Abstract

PURPOSE:To provide a monitor using a television camera. CONSTITUTION:A monitored region Kj is provided in relation to the specified monitored object part of a monitored field of view FLD, and an action condition confirming region CON is provided in addition so as to take in luminosity data indicating the luminosity change of the monitored field of view FLD from the action condition confirming region CON. When the luminosity data exceeds the specified reference value, assessment action on the monitored region is inhibited, and the reference data is corrected into the value optimized for the luminosity change. Even the sudden luminosity change of the monitored field of view can be thereby met to prevent unnecessary abnormality judgment, so that the optimum assessment result can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance device, and is particularly suitable for application when an abnormality is detected within the surveillance field of view of a television camera.

[0002]

2. Description of the Related Art As a monitoring device of this type, as shown in FIG. 10, a monitoring field of view FLD represented by a video signal obtained by imaging with a television camera is shown.
One or a plurality of monitoring areas Kj (j = 1, 2 ... J) is set at a predetermined position in the monitoring field of view FLD, and a video signal corresponding to this monitoring area Kj (j = 1,2 ... J). When the brightness of changes from the predetermined normal brightness,
A device that determines that an abnormality has occurred in the monitoring visual field FLD has been proposed as, for example, an object detection device (Japanese Patent Laid-Open No. 60-39581).
Publication).

[0003]

This type of monitoring device is
In monitoring the abnormality in the monitoring visual field, the monitoring visual field data for one frame is not compared with the reference visual field data as a whole, but a relatively small monitoring area Kj (j = 1, 2, ...
It is possible to easily realize a monitoring device having a simple overall structure and having sufficient judgment accuracy in practical use in that it is possible to judge the presence or absence of an abnormality only by monitoring the video data of J).

However, in this type of monitoring device, for example, the lighting is repeatedly turned on or off at a monitoring place in a room,
The morning sun or the setting sun suddenly enters, the brightness of the sunlight entering through the window changes due to the movement of clouds, or the brightness within the monitoring field of view changes as the crane in the factory moves, for example. In this case, a change in the brightness of the monitoring visual field environment causes a sudden change in the brightness of the monitoring area Kj (j = 1, 2 ... J), and thus this may be erroneously determined to be an abnormality. There is.

As a first method for solving such a problem, a change in the brightness of the monitoring visual field environment occurs by using the past monitoring data obtained from the monitoring area Kj (j = 1, 2 ... J). In this case, there is proposed a method for avoiding erroneous determination by correcting the determination reference value accordingly (Japanese Patent Laid-Open No. 60-39581).

As a second method, there is a method in which a calibration body is provided in advance in the surveillance field of view and the image signal is corrected based on the calibration data obtained from this calibration body (Japanese Patent Application No. 52-155892). ). However, in practice, it is difficult for the first method to correct the sudden change in the brightness of the surveillance visual field.

In the second method, the change in the brightness of the surveillance field of view does not occur uniformly as a whole, but in reality, the change in brightness is partially different. Therefore, the correction effect is still insufficient. is there.

Particularly, when the television camera is equipped with an auto iris, or when the television camera's AG is used.
When the C circuit operates, the monitoring area Kj (j = 1, 2
Since the way of changing the brightness of the video signal corresponding to ..J) becomes more complicated, it is difficult to correct the change in brightness to a practically sufficient degree.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a monitoring device capable of further reducing the risk of erroneous determination even when the brightness of the monitoring visual field environment partially changes. To do.

[0010]

In order to solve such a problem, according to the present invention, the brightness information in the surveillance field of view FLD represented by the video signal VD obtained by imaging with the television camera 11 is displayed. Of the monitoring area data extracting means (36, RG2, SP5) for extracting the first brightness data representing the brightness from the monitoring area Kj that specifies the image of the predetermined monitoring target portion, and the monitoring field of view FLD. Of the brightness information, when the brightness of a part or the whole of the monitoring visual field FLD changes, from the operation condition confirmation area CON that specifies the image part whose brightness changes according to the change of the brightness of the monitoring visual field FLD, Operating condition confirmation area data extracting means (36, R) for extracting the second brightness data representing the brightness.
G3, SP5) and the first brightness data for each monitoring area K
Abnormality occurrence determining means (36, RG6, SP7) for comparing with the abnormality determination reference value data set to correspond to j to determine whether or not an abnormality has occurred in the corresponding monitoring area Kj.
And comparing the second brightness data with the operation condition confirmation reference value data set so as to correspond to each operation condition confirmation region CON, and whether or not a change in brightness has occurred in the corresponding operation condition confirmation region CON. The operation condition change determination means (36, RG8, SP6) and the operation condition change determination means (36, RG6, SP7) for determining whether or not there is a determination result indicating that no change has occurred, and the abnormality occurrence determination means A monitoring determination unit (36, SP6, S6) that determines that an abnormality has occurred in the monitoring visual field FLD when a determination result indicating that an abnormality has occurred in (36, RG6, SP7) is obtained.
And P7).

Further, the operating condition change judging means (36, R
G8, SP6), when a determination result indicating that a change has occurred is obtained, the monitoring determination means (36, SP)
6, SP7), the abnormality determination criterion is prohibited based on the brightness data obtained from each monitoring area Kj and each operation condition confirmation area CON for the monitoring visual field FLD in the state where the brightness change occurs. Reference value data correction means (36, SP3, SP4) for correcting the value data and the operation condition confirmation reference value data are provided.

[0012]

When the second brightness data obtained from the operating condition confirmation area CON has not changed, the monitoring field of view FLD
Means that there is no abrupt change in brightness such that the abnormality occurrence determining means (36, RG6, SP7) makes an erroneous determination operation. At this time, the monitoring determining means (36, SP6, S7).
In P7), the monitoring determination operation is enabled.

On the other hand, the operating condition change judging means (3
6, RG8, SP6), when a determination result indicating that a change has occurred is obtained, the monitoring determination means (36, SP6,
The monitoring determination operation of SP7) is prohibited, and the reference value data is corrected by the reference value data correction means (36, SP3, SP4). Thus, the monitoring device has a monitoring field of view F.
Even when a sudden change in brightness occurs in the LD environment, a decision output adapted to the sudden change in brightness is generated without unnecessarily generating a false judgment output.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

[1] First Embodiment As shown in FIG. 1, in principle, the monitoring device according to the present invention has a monitoring area Kj (j = 1, 2, ... J) within a monitoring field of view FLD obtained from a television camera. In addition to the above, an operating condition confirmation area CON is set, and the monitoring visual field FLD is set based on the brightness of the video signal portion corresponding to the operation condition confirmation area CON.
It is possible to confirm that the brightness is not in a state that causes an erroneous determination.

The monitoring device 1 having such a function has a structure as shown in FIGS. In FIG. 2, the monitoring device 1 uses a television camera 11 to monitor a field of view F.
Video signal V obtained by imaging the scene of LD
D is a video data input unit 12 and a timing control unit 13
Monitor 1 through the display control circuit 14
5, and as a result, as shown in FIG.
An image representing the scene of the LD (this is called a monitor input image VDIN) is displayed on the display screen of the monitor 15.

The timing control unit 13 applies V to the video signal.
By separating the synchronizing signal (which is composed of the horizontal synchronizing signal and the vertical synchronizing signal) included in D in the synchronizing signal separating circuit 21, the clock signal CL synchronized with the horizontal synchronizing signal and the vertical synchronizing signal is supplied to the timing generating circuit 22. give.

The timing generation circuit 22 outputs the clock signal C.
L is counted to form position data representing the current scan position for each line of the video signal VD, and the timing signals TM1, TM2 and T are generated based on the position data.
By applying M3 to the sampling and holding circuit 25, the analog / digital conversion circuit 26, and the image information memory 27 of the video data input unit 12, the video signal VD for one frame has a predetermined number of pixels (for example, 512 × 512 pixels).
Digital data (e.g., 8 bits) and is stored in the image information memory 27.

In addition to this, the timing generating circuit 22 compares one data formed based on the clock signal CL with the mark position data MKP provided from the mark information memory 31, and when they match, the timing signal TM4 is sent to the display control circuit 14. As shown in FIG. 1, the monitor area Kj (j = 1, 2 ... J) consisting of one or a plurality of marks having a predetermined shape is displayed on the display screen of the monitor 16 and the operating condition confirmation area CON. Is superposed on the monitor input image VDIN displayed based on the video signal VD together with a cursor (not shown).

At this time, the timing generation circuit 22 applies the timing signal TM3 to the image information memory 27 in synchronization with the timing position information TM4, so that the monitoring area Kj is obtained.
(J = 1, 2, ... J) and the brightness data DBRT corresponding to the operating condition confirmation area CON are sent to the bus 35.

Such operations of the video data input section 12 and the timing control section 13 are carried out by the central processing unit (CPU) 36 via the bus 35 together with the operation of the other components forming the monitoring apparatus 1. PRO
M) When the operator designates and inputs the program stored in 37 using the key input board 38, control processing is performed using various registers provided in the work memory 39.

That is, the CPU 36 enters the mark setting mode MD1 at step SP1 of the monitoring processing routine RT0 shown in FIG. 3 so that the operator can visually check the monitoring input image VDIN corresponding to the monitoring field of view FLD on the monitor 16 while inputting the key input board. Field of view FL using 38
At the position of the monitoring target portion in D, the monitoring area Kj (j = 1,
2 ... When the mark position information corresponding to J) is input and stored, this is stored in the mark information memory 31.

In addition to this, the operator sets the operating condition confirmation area CON through the key input board 38 at a predetermined position on the monitoring visual field FLD (for example, the image portion of the illumination light source in the room where the monitoring visual field is set). When the corresponding mark position information is input and operated, the CPU 36 stores the mark position information in the mark information memory 31.

In practice, this mark position information is the monitoring area Kj.
And mark position information represented by position data (x _j , y _j ) and (x _c , y _c ) in the upper left corner representing the operating condition confirmation area CON, and shape information representing the shape of the mark display,
An operator operates the cursor setting key of the key input board 38, including other management information, so that the CPU
Reference numeral 36 sets the cursor display KS at an arbitrary position on the display screen 15A by giving the cursor / message display data DSP to the display control circuit 14, and gives the mark position information by giving the setting command together with the mark shape data. The mark information memory 31 is loaded.

Here, the position data of the cursor KS is held in the cursor position register RG1 of the work memory 39 as shown in FIG. On the other hand, the CPU 36 applies the command signal INT1 to the timing generation circuit 22 in the monitoring mode MD2, so that the image data corresponding to the mark position data MKP among the image data for one frame stored in the image information memory 27. Are sequentially read, and the pixel data in the area where the mark display is superimposed (that is, the mark area) is added for each of the monitoring areas Kj (j = 1, 2 ... J) and the operation condition confirmation area CON. And loads it into the corresponding register of the work memory 39 (FIG. 5).

At this time, the CPU 6 first detects the monitor input video VD.
Monitoring area Kj set on IN (j = 1, 2 ... J)
After the simple addition values of the pixel data of 1 are sequentially loaded into the abnormality determination reference data register RG6 of the mark memory 39,
Operating condition confirmation area setting processing subroutine RT11 in FIG.
To execute.

Subsequently, the CPU 36 calculates the difference between the light-on data and the light-off data in step SP05 to judge whether the difference value is larger than a predetermined difference value Δ, and when a negative result is obtained, the brightness is determined. It is determined that the difference in height is insufficient, the process proceeds to step SP06, and a display indicating that the difference is insufficient is displayed on the monitor 15 to request the operator to reset the setting, and the process returns to step SP02. To process.

When it is confirmed in step SP05 that the operator has adjusted the operating condition confirmation environment so that the difference in brightness between when the light is turned on and when the light is turned off is larger than the predetermined reference value Δ, the CPU 36 performs the operation in step SP07. The condition confirmation area setting process subroutine is terminated and the process returns to the main routine. Thus, the CPU 36 enters the monitoring mode MD2 from step SP3 when the operator operates the monitoring start key of the key input board 38 in step SP2 after the mark setting mode in step SP1 is completed.

That is, in the monitoring mode DM2, the CPU
First, in step SP3, brightness data is stored in the monitoring area brightness information register RG2 for each monitoring area Kj (j = 1, 2 ... J) as reference value calculation data, and the brightness is read from the operation condition confirmation area CON. After fetching the measurement data into the operation condition confirmation area brightness information register RG3, the judgment reference value is calculated in step SP4 and stored in the abnormality judgment reference value data register RG6 and the operation condition confirmation reference value data register RG8, respectively.

In the case of this embodiment, a plurality of times (for example, 4
By using the average value of the brightness data of the monitoring area Kj (j = 1, 2, ... J) of the times) as the judgment reference value, a smooth brightness such as a secular change of the illumination light source can be obtained. Even if there is a change, the judgment reference value is corrected according to the change so as not to cause an erroneous judgment.

Subsequently, the CPU 36 outputs the brightness data of the monitoring area Kj (j = 1, 2 ... J) and the operating condition confirmation area CON in the work memory 3 in step SP5.
After the data indicating the current state of the monitoring field of view FLD is taken into the monitoring area brightness information register RG2 and the operation condition confirmation area brightness information register RG3 of No. 9, step S
In P6, operating condition confirmation area brightness information register RG
It is judged whether or not the data of No. 3 is abnormal in the operation condition confirmation value data register RG8.

In the case of this embodiment, when the value of the brightness data of the operation condition confirmation area brightness information register RG3 does not exceed the reference value data of the operation condition confirmation reference value data register RG8, the brightness state of the monitoring visual field FLD. Is determined to be in a state capable of monitoring operation, and at this time CP
U36 obtains a negative result in step SP6, stores the judgment result in the operation condition confirmation result register RG9, and then moves to step SP7 to monitor area Kj (j = 1, 2).
...... Determine the monitoring result for J).

On the other hand, when a positive result is obtained in step SP6, this means that the brightness of the monitoring field of view FLD has changed rapidly, and at this time the CPU
In step 36, the monitoring determination operation of step SP7 is not performed, and the process returns to step SP3 described above to start the data reacquisition process again.

In step SP7, the CPU 36 compares the data in the monitoring area brightness information register RG2 with the data in the abnormality determination reference value data register RG6 to determine whether there is an abnormality, and when a negative result is obtained. CPU3
6 determines that an abnormality has occurred, stores the determination result in the abnormality determination result register RG7, and then executes step SP8.
Then, the process waits until the abnormal process ends, and when the abnormal process ends, the process returns to step SP5.

On the other hand, the CPU 36 proceeds to step SP7
If a positive result is obtained in
This means that no abnormality has occurred at the position of the monitoring area Kj (j = 1, 2 ... J) of D. At this time, the CPU 36 confirms in step SP9 whether or not the judgment reference value calculation time has come. If a negative result is obtained, step SP
At 10, the system waits for the monitoring time, and when the monitoring time comes, the process returns to the above-mentioned step SP5 to repeat the acquisition of new data.

On the other hand, when a negative result is obtained in step SP9, this means that it is time to update the judgment reference value. At this time, the CPU 36 proceeds to step SP4 and moves to the abnormality judgment reference value data register. By executing the average value calculation of RG6, the reference value is corrected with respect to the gradual change of the measurement environment of the monitoring visual field FLD.

The data of the reference value calculation time of step SP9 and the data of the monitoring time of step SP10 are stored when the operator inputs them through the key input board 38, and the current time data is stored in the timer connected to the bus 35. It is designed to be obtained by 40.

Further, one of the abnormal processing in step SP8
As an example, the CPU 36 sends a control output CON2 by giving a command signal INT2 to the external control circuit 41 via the bus 35 to notify the external device 42 of the occurrence of an abnormality, and as a result, the external device 42 sends a response command signal INT3.
When it reaches the external control circuit 41, the control signal CON3 is taken in via the bus 35. In the above configuration, when the CPU 36 enters the monitoring processing routine of FIG. 3, the step SP is executed in response to the operator's input operation.
1, the initial condition is set, whereby the mark type and the mark position of the monitoring area Kj (j = 1, 2 ... J) and the operation condition confirmation area CON are set in the mark information memory 31, and the work memory 39 The monitoring time interval data register RG4 and the reference value calculation time interval data register RG5 store the monitoring time interval data and the reference value calculation time interval data, respectively.

When performing the initial condition setting process, the CP
U36 executes the operating condition confirmation region setting processing subroutine of FIG. 4 for the operating condition confirmation region CON to determine the operating condition confirmation region CON when the illumination light source as the ambient light is turned on and off. By confirming that the difference in brightness is equal to or larger than the predetermined value Δ, when a sudden change occurs in the brightness of the monitoring visual field FLD, this is surely grasped as a change in the operating condition confirmation area CON. Can be set to

After that, the CPU 36 enters the monitoring mode DM2 when the operator operates the monitoring start key in step SP2, and first, in step SP3, the monitoring area Kj (j = 1, 2 ... J) and the operating condition confirmation area CO.
Brightness data of N is monitored area brightness information register RG2
And the operating condition confirmation area, after being loaded into the brightness information register RG3, all the monitoring areas K are read in step SP4.
j (j = 1, 2 ... J) and the operation condition confirmation area CON, a judgment reference value which is a simple average value of the data of the past four monitoring cycles is calculated, and the abnormality judgment reference value data register RG6 and the operation condition confirmation are calculated. Reference value data register RG8
To store.

Since the conditions for starting the abnormality determination operation have been set in this manner, the CPU 36 proceeds to steps SP5-SP6-SP7-.
By repeatedly executing the normal operation processing loop of SP9-SP10-SP5, the monitoring area Kj (j = j = j = j) at the monitoring time interval determined by the monitoring time interval data stored in the monitoring time interval data register RG4 of the work memory 39.
Check that there is no abnormality in brightness in the operation condition confirmation area CON. Incidentally, when there is no abnormality in the monitoring visual field FLD, the illumination light source is repeatedly turned on and off, so that the brightness of the monitoring visual field FLD does not suddenly change. Therefore, the determination operation based on the monitoring area Kj is performed. It can be stable. In this state, the CPU 36 obtains a negative result in step SP6, or the brightness of the monitoring target in which the monitoring area Kj (j = 1, 2, ... J) is set is all in the normal monitoring state with respect to the abnormality determination reference value. Therefore, the CPU 36 obtains a positive result in step SP7.

Therefore, as long as the judgment reference value calculation time stored in the judgment reference value calculation time interval data register RG5 has not elapsed, the CPU 36 obtains a negative result in step SP9, so that the monitoring time interval data register RG4 is stored in step SP10. The process waits for the stored monitoring time to come, and when the monitoring time comes, a positive result is obtained at step SP10, so that a new data fetch operation is performed at step SP5. As described above, in a state in which there is no abnormality in the monitoring visual field FLD, for example, somebody enters the monitoring visual field FLD and one or a plurality of brightnesses in the monitoring region Kj (j = 1, 2, ... J) Is changed, in the monitoring area Kj where the abnormality has occurred, the monitoring area brightness information register R
Since the value of the brightness information currently fetched in G2 exceeds the abnormality determination reference value stored in the abnormality determination reference value data register RG6, the CPU 36 makes a negative result in step SP7 for the monitoring area Kj in which the abnormality has occurred. Then, the abnormal operation processing loop is entered and the abnormal processing operation of step SP8 is executed.

In the case of this embodiment, the CPU 36 sends a control signal CON2 to the external device 42 via the external control circuit 41.
, The external device 42 locks the auto lock, turns on the lighting and the patrol light, sounds the buzzer, and notifies the predetermined remote device through the telephone line. When the release command INT3 from the external device 42 arrives at the external control circuit 41 after the above processing in the monitoring visual field FLD is finished, the CPU 36 returns to step SP5 and returns to step SP5-SP6-SP7-SP9-SP10.
-Return to the normal operation processing loop of SP5.

In this normal operation processing loop, when the illumination light source is turned on (or turned off) on the monitoring visual field FLD, the brightness of the monitoring visual field FLD changes abruptly in whole or in part, and at this time, the monitoring visual field in step SP5. In the FLD, the operating condition confirming value is obtained by the abrupt change of the brightness information captured in the operating condition confirming region CON of the work memory 39 from the operating condition confirming region CON set in the image portion of the illumination light source. Since the state exceeds the operating condition confirmation value of the data register RG8, the CPU 36 obtains a positive result in step SP6, and thereby determines that the abnormality has occurred, and changes the operating conditions of steps SP6-SP3-SP4-SP5-SP6. Execute a processing loop and set the operation condition check result to the operation condition check result register. And stores it in the RG9.

In this state, the CPU 36 cannot perform the determination operation in step SP7. Therefore, the monitoring area Kj (j
= 1, 2 ... J), the abnormality determination reference value data stored in the abnormality determination reference value data register RG6 is the value of the monitoring area brightness information fetched in the monitoring area brightness information register RG2. Even if there is something exceeding the value of, it becomes a state in which the operation of determining whether or not this is abnormal is not performed, and thus it is possible to prevent an inappropriate operation of abnormality determination when the operating conditions are not appropriate. In addition to this, when the operation condition change processing routine is entered, the CPU
In step SP3, 36 indicates all monitoring areas Kj
(J = 1, 2, ... J) and operating condition confirmation area CON, the current brightness information is monitored area brightness information register R.
After writing to G1 and the operating condition confirmation area brightness information register RG3, in step SP8 the calculation of the judgment reference value in the state of the monitoring visual field FLD changed to the new operation condition is executed to execute the abnormality judgment reference value data register R.
The data in G6 and the operation condition confirmation reference value data register RG8 are rewritten.

By repeatedly executing the operation condition change processing loop in this manner, the values of the abnormality determination reference value data register RG6 and the operation condition confirmation value data register RG8 are in a state where the illumination light source is turned on (or turned off) before long. Since the value is corrected to a value that optimizes the operating condition of the monitoring visual field FLD, the operating condition eventually becomes abnormal. At this time, the CPU 36 enters a state in which a negative result is obtained in step SP6, and then step SP6
-Returns to the normal operation processing loop of SP7-SP9-SP10-SP5-SP6.

When the illumination light source is turned off (or turned on) again in such a state, the monitoring field of view FLD is also obtained at this time.
The CPU 36 detects the change in the operating condition in step SP6 due to the abrupt change in the brightness of the data, and enters the operating condition change processing loop in step SP6-SP3-SP4-SP5-SP6 to enter the abnormality determination reference value data register RG6. Then, the data stored in the operating condition confirmation value data register RG8 is rewritten so as to be optimized for the new operating condition, and the CPU 36 ends up in step S.
If a negative result is obtained in P6, step SP6-SP7-
It operates to return to the normal operation processing loop of SP9-SP10-SP5-SP6.

According to the above configuration, when the brightness of the monitoring visual field FLD changes abruptly, the monitoring region Kj (j =
Even if the entire monitoring field of view is changed, the monitoring reference operation based on the brightness data obtained from 1, 2, ... It is possible to obtain an appropriate monitoring determination result by following the change in the state even when the brightness of the part or part of the brightness is changed.

[2] Other Embodiments (1) In FIGS. 6 and 7, when a plurality of television cameras are used and an abnormality occurs in any of a plurality of monitoring visual fields, the operator can easily recognize this. It shows a monitoring device that is made possible. The monitoring device 51 in this case has a plurality of, for example, four television cameras 11A to 11D, and the television cameras 11A to 11D are sequentially arranged at a predetermined position, for example, a predetermined position of one intrusion passage.

Thus, the first, second, third and fourth television cameras 11 are sequentially arranged along the intrusion passage.
Video signal V obtained from A, 11B, 11C and 11D
D1, VD2, VD3 and VD4 are analog / digital conversion circuits 53A, 53B, 53C and 5 of the image synthesizing unit 52.
After being converted into digital data in 3D, they are loaded into the frame memories 54A, 54B, 54C and 54D, respectively. Frame memories 54A, 54B, 54C,
54D is composed of a two-port RAM, respectively, and reads out from the output port while thinning out image data read from the input port as needed, so that the video signal V
Image data DATA obtained by reducing one frame of image data of D1, VD2, VD3, and VD4 at a predetermined reduction ratio.
1, DATA2, DATA3, DATA4 are converted and given to the switching conversion output circuit 55.

The switching output circuit 55 uses the image data DATA1.
In addition to DATA4, the graphic data DFIG generated in the graphic generation circuit 56 is repeatedly supplied to the output circuit 55 as image data DATA5 via the frame memory 57 of the 2-port RAM configuration. In the case of this embodiment, as shown in FIG. 7, the graphic generation circuit 56 simulates the passage to be monitored to the "53rd Tokaido" and the television camera 1
1A, 11B, 11C, 11D placement position "Tokaido 5
Four post stations of "3rd""Edo","Mishima","Kuwana",
The figure data DFIG consisting of the figure "Yajikita Dochu" drawn by simulating "Kyo" is obtained as the image data DATA5, and the television cameras 11A, 11B, 11C, 1
Video signals VD1, VD2, VD3 obtained from 1D,
Image data DATA1 and D formed by reducing the image of VD4
ATA2, DATA3, DATA4 at each post "Edo",
The display image PIC fitted in the positions of “Mishima”, “Kuwana”, and “Kyo” is combined in the switching output circuit 55 and output as combined image data DOUT.

The composite image data DOUT is supplied to the monitor 15A via the display control circuit 14A having the same function as the display control circuit 14 of the monitoring device 1 of FIG. 2, thus displaying the display image PIC on the monitor 15A. .. At the same time, the composite image data DOUT is supplied to the video data input unit 12A having the same function as the video data input unit 12 of FIG. 2, and thus the monitoring device 51 operates in the same manner as the monitoring device 1 of FIG. By synchronizing with the command signal INT11 provided to the switching output circuit 55 by the image data processing element related thereto, the four television cameras 11A to 11A ... It is possible to display the occurrence of abnormality in the monitoring visual field in 11D on one screen.

According to the arrangements shown in FIGS. 6 and 7, a plurality of television cameras are simulated as post names "Edo", "Mishima",
By being able to distinguish between "Kuwana" and "Kyo", it is possible to obtain a monitoring device that is much easier for the operator to grasp as compared with the case where these numbers are simply displayed on the television camera. ..

(2) In the case of the embodiment shown in FIGS. 1 to 5, one operating condition confirmation area CON is set to the monitoring area Kj (j = 1, 2).
..) and the brightness of the monitoring field of view FLD is changed as a whole. However, a plurality of operating condition confirmation areas CON are provided and / or a partial area of the monitoring area Kj. Even if they are set so as to overlap with each other and / or provided in a position where the brightness of the monitoring field of view FLD partially changes, the same effect as the above case can be obtained.

(3) In the case of the embodiment shown in FIGS. 1 to 5, when the brightness data is calculated from the monitoring area Kj (j = 1, 2 ... J) and the operation condition confirmation area CON, the monitoring area is calculated. Kj
Also, the pixel data in the operation condition confirmation area CON is simply added, but instead, as shown in FIG. 8 or FIG. 9, by weighting the pixels, the change in the brightness of the monitoring target is emphasized. However, this may make it easier to determine whether or not an abnormality has occurred. Further, binary data may be obtained as the brightness data obtained from the monitoring area Kj and the operation condition confirmation area CON. In this case, it is desirable that the threshold level for conversion into binary data can be set individually for each monitoring area Kj and operating condition confirmation area CON.

As in the case of FIG. 2, the video signal VD
Instead of converting after converting to digital data,
The integration result obtained by analog integration may be converted into digital data. Further, in the configuration of FIG.
Instead of providing the frame memory 27, each monitoring area K
j and an accumulator (comprising an adder and a memory) corresponding to the operation condition confirmation area CON are provided, and the number of the mark stored in the mark information memory 31 and the pixel data fetched in the video data input unit 12 are stored. Even when the video data is added to the corresponding accumulator when the coordinate values match, the same effect as the above case can be obtained.

(4) In the embodiment shown in FIGS. 1 to 5, the same area as the monitoring area Kj is designated as the operation condition confirmation area CON, but instead of this, the operation condition confirmation area CON The shape and / or the display color may be made different from that of the monitoring area Kj so as to be distinguished. Further, the video signal VD is always displayed on the monitor regardless of whether the monitoring visual field FLD is normal or abnormal, but instead of this, the video signal VD is not displayed on the monitor 15 in the normal state and is monitored only in the abnormal state.
The image of may be displayed. Further, a television receiver may be applied as the monitor 15 so that the television reception image is displayed in a state other than when an abnormality is detected. As a message display on the monitor 15, a help display of operation, a display of a monitoring state, and the like can be displayed.

(5) The external device 42 shown in FIG. 2 is not limited to the above-mentioned one, but the television camera 11 can be used when an abnormality occurs.
The video signal VD obtained from the above may be transmitted to a remote place or recorded in a recording device such as a video tape recorder. In addition, the command signal INT from the external device 42
As 3, there may be applied various things such as giving a control command to the CPU 36 from the outside and supplying the timing of monitoring or correction.

(6) In the configurations of FIGS. 1 to 5, the sync signal separation circuit 21 extracts the vertical sync signal and the horizontal sync signal from the video signal of the television camera 11 and supplies them to the timing generation circuit 22. But CPU3
The method of synchronizing with 6 is not limited to this. For example, a vertical synchronizing signal is used to give an interrupt signal to the CPU 36, or a synchronizing signal generating circuit is provided on the CPU 36 side to supply the synchronizing signal to the television camera 11. Alternatively, a synchronization signal generation source may be provided separately from the monitoring device 1, and the synchronization signal generation source may supply the synchronization signal to the television camera 11 and the CPU 36.

(7) In the case of the embodiments of FIGS. 6 and 7,
Although one image synthesizing unit 52 is provided, two or more image synthesizing units 52 are provided, and the synthetic image data DOUT of the plurality of image synthesizing units are further switched by a switching output circuit as needed. By doing so, image data from a large number of television cameras can be combined into one display image as needed. In the configurations of FIGS. 6 and 7, when the operator specifies the camera number from the key input board, the cursor indicating the position of the mark to be set is moved to the range in which the image from the specified camera is displayed, The buzzer sounds when trying to move to other areas, so that the operator is informed that the operation cannot be performed.

The image data DATA1, DATA2,
When the monitoring area Kj and the operation condition confirmation area CON are set to the coordinate values in the display areas of DATA3 and DATA4,
The camera number can be identified by the set coordinate value. For example, if the coordinate value of the monitoring area Kj or the operation condition confirmation area CON is 0 <y <255, 256 <x <512, the mark is the second camera, that is, the image data DATA.
It is a mark for monitoring the image from the second camera, that is, the camera with the post name "Mishima", and when an abnormality is detected in the mark, it can be immediately determined that an abnormality has occurred in the second camera.

In this case, in the vicinity of the boundary of image switching, for example, y
= 256 or x = 256, it is possible to prevent the cursor, which is a mark setting guide, from moving so that the mark cannot be set. The display image of the post name that corresponds to the surveillance field of view in which the anomaly occurred, such as the post “Edo”, “Mishima”, “Kuwana”, or “Kyo”, displays a message notifying that an anomaly has occurred. The operator is informed by sounding a buzzer or lighting a patrol light near the part monitored by the television camera. Instead of such a method, the contents of the image data of the lodging name where the abnormality has occurred may be displayed on the entire surface of the display image PIC without being reduced. In the case of the embodiment of FIG. 7, a plurality of, for example, four pieces of display data are displayed as a part of one display image PIC, but instead of this, the first to fourth image data are sequentially switched. However, they may be displayed on a common display screen.

(8) In the case of the embodiment shown in FIG. 4, in determining whether or not the data difference is larger than the predetermined difference Δ in step SP05, a fixed value is used as the predetermined difference data Δ. However, instead of this, by calculation from the value of the data captured from the surveillance field of view, for example,
The value may be selected to be 25%.

[0064]

As described above, according to the present invention, when the brightness in the surveillance field of view suddenly changes, even if the influence appears in the surveillance area, it is not judged whether it is abnormal or not. At the same time, by changing the reference value so as to optimize the change, it is possible to easily realize the monitoring device that can obtain the optimum monitoring evaluation result so as to adapt to the rapid change in the brightness. ..

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a surveillance input image of a surveillance device according to the present invention.

FIG. 2 is a system diagram showing an overall configuration of a monitoring device.

FIG. 3 is a flowchart showing a monitoring processing routine of a CPU 36 in FIG.

4 is a flow chart showing the processing contents of an initial condition setting step SP1 of FIG.

5 is a schematic diagram showing a detailed configuration of a work memory 39 in FIG.

FIG. 6 is a block diagram showing another embodiment of the present invention.

7 is a schematic diagram showing a display image on the monitor of FIG.

FIG. 8 is a schematic diagram for explaining another embodiment of the present invention.

FIG. 9 is a schematic diagram for explaining another embodiment of the present invention.

FIG. 10 is a schematic diagram showing a conventional configuration.

[Explanation of symbols]

1, 51 ... Monitoring device, 11, 11A to 11D ... Television camera, 12 ... Video data input section, 13 ...
... Timing control unit, 14 ... Display control circuit, 15 ...
Monitor, 22 ... Timing generation circuit, 27 ... Image information memory, 31 ... Mark information memory, 36 ... CP
U, 38 ... key input board, 39 ... work memory,
41 ... External control circuit, 42 ... External device.

Claims (2)

[Claims] 1. The brightness from a monitoring area designating a predetermined video portion of a monitoring target in brightness information in the monitoring visual field represented by a video signal obtained by imaging with a television camera. Area data extraction means for extracting the first brightness data indicating the brightness, and the brightness of the monitoring field of view when the brightness of a part or the whole of the monitoring field of the brightness information in the monitoring field of view changes. Operating condition confirmation region data extracting means for extracting second brightness data representing the brightness from the operating condition confirmation region designating an image portion whose brightness changes according to the change in brightness, and the first brightness. Abnormality data determining means for determining whether or not an abnormality has occurred in the corresponding monitoring area by comparing the measurement data with abnormality determination reference value data set so as to correspond to each of the monitoring areas; Brightness day Is compared with the operating condition confirmation reference value data set to correspond to each of the operating condition confirmation regions, and it is determined whether or not a change in brightness has occurred in the corresponding operating condition confirmation region. Means and the operating condition change determining means, a determination result indicating that no change has occurred and the abnormality occurrence determining means has obtained a determination result indicating that an abnormality has occurred A monitoring apparatus comprising: a monitoring determination unit that determines that an abnormality has occurred. 2. When the operation condition change determination means obtains a determination result indicating that a change has occurred, the determination operation in the monitoring determination means is prohibited and the change in brightness occurs. Reference value data correction means for correcting the abnormality determination reference value data and the operating condition confirmation reference value data based on the brightness data respectively obtained from the monitoring regions and the operating condition confirmation regions in the monitored field of view The monitoring device according to claim 1, further comprising: