JP2566221B2 - Disaster prevention and crime prevention system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a disaster prevention and crime prevention system that issues an alarm when a change in a monitoring image is detected by an imaging device such as a TV camera.

[Background Art] When a disaster prevention sensor such as a smoke detector or a heat-sensitive element or a heat ray detection type crime prevention sensor operates, a security company is automatically notified via a telephone line. There is a conventional disaster prevention and crime prevention system that reports to a police station or a fire station after urgently confirming it.However, since this conventional system uses the above sensor, there are many false alarms, and there is a method to confirm on the spot. Since it is taken, there was a problem that it took time from the issuance of a report to the confirmation. Therefore, a method of dealing with it by automatically operating a disaster prevention device or a crime prevention device provided on the transmitting side can be considered, but it is not suitable for automatic processing because the malfunction of the sensor is covered.

As a method of eliminating the time required for confirmation, a method of transmitting an image of the monitoring area by a still image transmission device is conceivable, but it is not an automatic countermeasure based on the image.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to detect a fire by an image of a monitoring area,
An object of the present invention is to provide a disaster prevention and crime prevention system capable of automatically taking measures such as automatic fire extinguishing and automatic locking by judging an abnormality such as the presence of an intruder.

DISCLOSURE OF THE INVENTION The present invention changes by comparing a current image input from an imaging device and stored in a first frame buffer with a background image stored in a second frame buffer and a reference image composed of a previous image. A change detecting means for detecting the presence of an object, and a transmitting section having a communication means for transmitting the current image information through a communication line such as a telephone line and receiving a command from the receiving side when the change detecting means detects a change An image monitoring and reporting system comprising a communication unit for receiving the current image information received via the communication line and transmitting a command and a receiving unit having a unit for restoring and displaying the received current image information. On the transmission side where the transmission section is installed, fire-extinguishing devices, fire-proof doors, smoke-exhaust devices, and other disaster-related equipment;
In the crime prevention and disaster prevention system, which is provided with a control means for controlling these devices according to a command from the receiving side, and is provided with a means for creating the command on the receiving side where the receiving part is installed, the size of the change object detected by the change detecting means. It is characterized in that means for judging that the detection requirements such as the position, the movement, the shape, etc. do not satisfy the predetermined conditions, and the equipment is operated by the judgment of the judging means.

First Embodiment FIGS. 1A and 1B are circuit block diagrams of a transmission unit provided on the transmission side and a reception unit provided on the reception side of the device of this embodiment. An image pickup device 1 such as a TV camera is provided on the transmission side, and image processing of a video signal of a screen imaged by the image pickup device 1 is performed by the following circuit. That is, the video signal of the current image output from the image pickup apparatus 1 at the timing and address controlled by the image writing control circuit 3 according to the instruction of the current image update timing control circuit 2 corresponding to the current screen is used as a sample in the current image frame buffer. Taken in 4. This capture trigger is performed at a constant cycle (for example, 0.5 seconds) to detect a change, but is triggered by detection signals from various disaster prevention / crime sensor S connected to the current image update timing control circuit 2. It is taken in and taken in. Previous image frame buffer 5
Captures the image frame of the image before the current image from the current image frame buffer 4 before the new image frame corresponding to the current image is captured in the current image frame buffer 4, and corresponds to the previous image for the current image frame. It is for storing the previous image frame. The capacity of the current image frame buffer 4 is, for example, 256 × 256 pixels, and the gradation is 8
It corresponds to bits, and the previous image frame buffer 5 conforms to the current image frame buffer 4. The change detection circuit 6 is for determining whether or not there is a change in the current image frame with respect to the previous image frame based on the reference parameter set by the change detection control circuit 7, and for simply checking the position and size of the change. FIG. 2 shows a flow chart of the operation relating to the change verification of the change detection circuit 6. As can be seen from this flow chart, sequence control is performed, and for example, a previous screen (an image of the original surface level which is not the predicted image is, for example, 4 pixels). The value of the difference between each pixel) and the corresponding pixel on the current screen is sequentially obtained. Then, it is tested whether or not the magnitude of change for each pixel exceeds a predetermined first reference value R1, and the cumulative addition value of the magnitude of change to the X coordinate and the Y coordinate (projection [projection] ) Is obtained, and the coordinates (X ₁ , Y ₁ ) (X ₂ , Y ₂ ) of the rectangular area whose cumulative addition value is larger than the second reference value R2 are obtained.
It is possible to specify whether the coordinates of the change area are finally for the previous image or for the background image stored in the reference background image frame buffer 4 ', and the change detection sequence is first set as the reference background image. Next, when the previous image is set, the coordinates for the previous image are obtained. Then, it is tested whether or not the obtained change area is larger than a predetermined third reference value R3, and when it is larger than the reference value R3, it is judged that there is a change, and the judgment result and the coordinate data of the change area Is output.

The character information control circuit 8 is for creating alarm packet data. When the change detection signal output when the change detection control circuit 7 detects a change is input, the character information control circuit 8 creates alarm packet data. The communication data processing circuit 9 is for editing the alarm packet data according to a prescribed protocol. When the alarm packet data is generated, the communication control circuit 10 automatically dials through the line control unit (hereinafter abbreviated as NCU) 11, connects the subscriber telephone line through the exchange line 1 and the exchange 12, and calls the receiving side. Then, after confirming whether the receiving side is correct via the modem 13, the communication data processing circuit 9 transmits the edited alarm packet data. The sequential sharpening control circuit 14 sequentially creates fine image information from the rough image information, compresses these image information by the image compression circuit 15, processes them by the communication data processing circuit 9 according to a prescribed protocol, and executes them via the modem 13. It is to be transmitted. The voice circuit 29 is controlled under the control of the microphone pickup / speaker interrogation control circuit 30. When a microphone pickup command is sent from the receiving side, the voice circuit 29 operates for a certain period of time and collects the voice collected by the microphone 31. Is transmitted, and when a speaker interrogation command is sent, it operates for a certain time and the receiving microphone
The voice sent from the speaker 34 can be emitted from the speaker 32 to call the intruder, and the speaker's attention can be given to the intruder.
It can be turned to the 32 side. If the image pickup apparatus 1 is provided near the speaker 32, it is possible to capture images during or immediately after the speaker is called and transmit them sequentially with sharpness, and preferable images can be transmitted. The disaster prevention and crime prevention monitoring control circuit 44 is for inputting a detection signal from the sensor S to monitor an abnormal state related to crime prevention and disaster prevention, and for monitoring image information sent from the change detection circuit 6. The monitoring information is input to the setting condition determining unit 45. The setting condition determination unit 45 determines whether the warning level is based on a preset condition, and controls whether the fire extinguisher device, smoke exhaust device, or other disaster prevention related device 46 and the crime prevention related device automatic door control device 47 are controlled. It is a circuit to judge whether there is not, and the set conditions are the detection position and size change detection condition of the abnormally changed object and the operation setting condition when the receiving side is absent or there is no response. The setting is performed by an operation of automatic fire extinguishing and crime prevention condition setting by a disaster prevention and crime prevention monitoring control circuit 48, which will be described later, provided on the receiving side. The control state monitoring circuit 43 controls the VTR 42 or operates the disaster prevention device 46 and the automatic door control device 47 which is a crime prevention device when the determination signal of the setting condition determination unit 45 is input through the disaster prevention and security monitoring control circuit 44. Circuit.

The receiving side is connected to the subscriber telephone line through the exchange 18 and the switching line l ', and when the transmitting side calls, NC
It is designed to automatically receive calls by U19. The communication control circuit 23 controls the communication on the receiving side. When the transmitting side is confirmed via the modem 20 and the above-mentioned alarm packet data is received, the communication data processing circuit 21 causes the character information notifying circuit 22 to operate. A display character is written in the frame / graphic display frame buffer 24, and under the control of the display control circuit 41, a superimposing circuit 25 superimposes a display device 26 such as a CRT monitor to display an alarm and a speaker 26. Make more alarm sound. The voice circuit 28 creates an alarm sound signal, transmits an interrogation voice through the microphone 34 to the transmitting side under the control of the microphone sound / speaker interrogation control circuit 33, or collects the microphone sound transmitted from the transmitting side. The sound can be emitted from the speaker 27. The sequential sharpening control circuit 36 controls the image expansion circuit 37 based on image information corresponding to a clear image from a rough image transmitted from the transmission side, and an image is transmitted from the modem 20 via the signal data processing circuit 21. Expansion circuit 37
The image information that has been captured, compressed and transmitted is decompressed and written in the image display frame buffer 38, and an image is displayed on the display device 26 through the superimposing circuit 25. The mode control circuit 39 is for giving commands such as transmission speed switching, compression method switching, sharpening command, capture command, microphone sound collection command, speaker interrogation command, etc. to the transmission side, and the transmission switching command is for every second image. The change of the transmission rate is sent to the sequential sharpening control circuit 36 on the receiving side. Mode control circuit 39, character information control circuit
35, the communication data processing circuit 21, the modem 20, the switching off 18, the subscriber telephone line, the exchange 12, the modem 13, the communication data processing circuit 9, the character information control circuit 8, and the clearing control circuit 14 in sequence. The compression method switching command is a command for appropriately switching the compression method, and is sent to the image decompression circuit 37 on the receiving side and also to the image compression circuit 15 on the transmitting side in the same manner as the command for switching the transmission speed. The sharpening command is to sequentially command the sharpening control circuits 14 and 36 to perform sharpening when the compression speed is increased, and is transmitted to the transmitting side in the same manner as the transmission speed switching command described above. . Further, the capture command is a command for interrupting the transmission of the image information on the transmission side and repeating the sequence of sequential sharpening in the postoperative procedure. The disaster prevention / crime monitoring control circuit 48 is a circuit for performing the above-mentioned condition setting operation and issuing a control command such as a fire extinguishing and smoke discharging command and an automatic door locking and the like by an operation of a monitor.

Next, the operation of this embodiment will be described with reference to the circuit examples of FIGS.

First, when the detection signal of the sensor S is input to the disaster prevention / crime prevention monitoring control circuit 44 and the change of the image is detected, the disaster prevention / crime prevention monitoring control circuit 44, if the sensor S is, for example, a disaster prevention sensor, the number information of the operating sensor and the change. The change detection information of the object is sent to the setting condition determination unit 45. The setting condition determination unit 45 compares the setting condition with a preset setting condition, and outputs a determination signal for transmitting an alarm and an image as a warning level 1 when the comparison condition is less than the setting condition and the degree of risk is relatively low. Then
The character information control circuit 8 through the disaster prevention and security monitoring control circuit 44,
Judgment signals are sequentially sent to the sharpness control circuit 14 and the change detection control circuit 7, and an alarm and an image corresponding to the warning level are transmitted to the receiving side. In this transmission, first, automatic dialing is connected to the receiving side, and after confirmation, the above-mentioned alarm packet data is transmitted from the transmitting side to the receiving side. When the receiving side receives the alarm packet data, the communication data processing circuit 21 writes a display character to the character / graphics display frame buffer 24 via the character information notifying circuit 22 and the superimposing circuit under the control of the display control circuit 41. A display device 26 such as a CRT monitor is superimposed by 25 to display an alarm and a speaker 27 emits an alarm sound.

While the alarm packet data is being transmitted, the sequential sharpening control circuit 14 on the transmitting side is set to 4 in the current image frame buffer 4.
An image of 64 × 64 pixels is extracted from a pixel representing a block of 4 × 4 pixels, an image compression circuit 15 compresses a rough image of all images, and reference image data is stored in a reference image frame buffer 16 according to the same algorithm as the receiving side. Create and write. Of course, the old image data written in the reference image frame buffer 16 before this writing is written in the previous reference image frame buffer 17.

In this embodiment, the rough image is composed of 64 × 64 pixels by using the representative points of the block of 4 × 4 pixels, and each representative point is an average value of 4 pixels in the vicinity of the lattice point of the lattice of every 4 pixels. The influence of noise such as sampling position shift is reduced. Then, when transmitting a rough image, pixel information of lattice points for every four pixels is transmitted so that the shortage of pixels is compensated for by interpolation so that a rough situation can be determined. There is. When these 64 × 64 pixels are encoded with 4 bits per pixel, interpolating into 256 × 256 pixels corresponds to a code transmission amount of 4 × 1/16 = 0.25 bits / pixel.

On the receiving side, the image information transmitted from the modem 20 is fetched from the modem 20 to the image expansion circuit 37 via the communication data processing circuit 21, restored, and written in the image display frame buffer 38 to the display device 26 via the superimposing circuit 25. Display an image. The image at this time allows the supervisor to confirm whether a fire has occurred or a false alarm, and if this confirmation indicates a false alarm, the alarm is canceled. When a fire occurs, the monitor creates a fire extinguishing smoke emission command by the disaster prevention / crime prevention monitoring control circuit 18, and transmits this command to the transmission side under the functions of the communication control circuit 23 and the modem 20.
This command is taken into the control state monitoring circuit 43 under the operation of the modem 13 and the communication control circuit 10, and operates the disaster prevention related equipment 46. If there is no supervisor on the receiving side, or if there is no response, the number of actuation sensors S exceeds a predetermined value, or the size of the changing object is greater than or equal to a set value, and the actuation sensors S are installed. If the location or the detected position of the changing object is at a high-risk level, the disaster prevention / crime prevention monitoring control circuit 44 operates the disaster prevention-related equipment 46 through the control state monitoring circuit 43 to automatically extinguish and smoke. Of course, if the operating sensor S is a security sensor, the above-mentioned moving automatic door is locked.

Now, in image transmission, the clearing control circuit is sequentially on the transmission side.
256 × 256 restored from 64 × 64 pixel data by 14
From the image data in the pixel reference image frame buffer 16
128 × 128 pixel representative pixel and current image frame buffer 4
In the frame comparison with the representative pixel of 128 × 128 pixels, the pixel whose difference between frames is larger than the predetermined reference value is set as the change pixel, and the other pixels are set as zero pixels and the difference between the frames is set to zero. The image compression circuit 15 compresses and encodes the information of the changed portion based on the change information consisting of

The image compression method of the image compression circuit 15 includes a method of performing zero pixel, zero line compression and decompression, a method of variable sample density compression and decompression, and the like. In either case, a changed portion is changed according to the ratio of changed pixels to all pixels. The code transmission amount (information amount) to be transmitted is small.

In other words, if all of the time difference values of the quantization characteristics per pixel are set to 1 and encoded with 4 bits, and if 25% of 128 × 128 pixels change, then when the receiver side interpolates and restores to 256 × 256 pixels, The code transmission amount corresponds to 4 × 1/4 × 1/4 = 0.25 bits / pixel, and even if 100% is transmitted, it becomes 1 bit / pixel. This 1-bit / pixel compression can also be performed by encoding by variable sample density compression / expansion of 256 × 256 pixels, and can be replaced by compression of 128 × 128 pixels. Image recognition can be made clear with 128 × 128 pixels, even if interpolation is performed, the image is totally blurred. twenty five
When 6 × 256 pixels are encoded by variable sample density compression / expansion, the main edge and contour position become accurate, but fine noise appears, but the image becomes clear as a whole.

By the way, on the receiving side, the changed part of the image of 128 × 128 pixels is 256
The image of the reference image frame buffer 16 is transferred to the previous reference image frame buffer 17 at the same time as being displayed after being interpolated and restored to 256 pixels in the reference image frame buffer 16 on the transmitting side. The predicted image is written.

Next, the sharpening control circuit 14 sequentially compares the reference image frame buffer 16 and the current image frame buffer 4 which are interpolated and restored to 256 × 256 pixels from the data of 128 × 128 pixels, and compares the difference between the changed pixel and the zero pixel. The image compression circuit 15 compresses and encodes the information of the changed portion based on the change information consisting of

Here, the changed portion is 25% of 256 × 256 pixels, and when compressed to 4 bits per pixel, the code transmission amount is 4 × 1/4 = 0.1 bits / pixel, which is 4 bits / pixel when 100%. With 4 bits / pixel, the difference from the current image frame of 256 × 256 pixels is almost unknown when the reference value R4 shown in FIG. 3 is small. When coded at 3 bits / pixel by variable sample density compression / expansion, an image quality of about 4 bits DPCM can be obtained. Further, details may be slightly blurred, and when the screen is viewed at a distance of about 6 times the screen height from the screen of the display device 26, even with 2 bits / pixel, it is possible to transmit the whole image of a practical image quality.

In this way, the changing portion on the transmitting side is cut out by the inter-frame comparison between the reference image frame and the current image frame which are restored and predicted by the same algorithm as the receiving side.

Therefore, when transmitting an image of 256 × 256 pixels at 4 bits / pixel at a time, 32 Kbytes of data is required, but if it is transmitted by sequentially sharpening, 2 Kbytes at 64 × 64 pixels, 128 × 2K bytes at 25% of 128 pixels, 25 of 256 × 256 pixels
% Requires 8 Kbytes of data, totaling 12 Kbytes. Sequential sharpening requires 3/8 of data compared to transmitting all images at once, and 256 × 256 image information is about 1.5.
This is equivalent to being able to transmit in bits / pixel.

Here, when the change is 50%, it becomes 4 + 4 in the sequential sharpening.
This is equivalent to being able to transmit at about 3 bits / pixel at + 16 = 24 Kbytes, but that 2 Kbytes of information can be transmitted in about 20 seconds like an image of 64 × 64 pixels on a transmission path of 1200 bits / sec. Therefore, there is an effect that the outline of the image can be confirmed quickly.

Now, when the sequential sharpening sequence is completed, the current image update timing control circuit 2 is controlled by the sequential sharpening control circuit 8.
A new image is written into the current image frame buffer 4 via the image writing control circuit 3 via the image writing control circuit 3 and the next sequence of sharpening is repeated.

By the way, the change part is 25%, and in order to transmit by the compression method of 4 bits / pixel, since 12K bytes of data are transmitted in one sequence, a transmission time of about 1.5 minutes is required, but the receiving command from the receiving side However, when it is given to the transmission side via the mode control circuit 39 and the character information control circuit 35, the sequential sharpening control circuit 14 on the transmission side interrupts the transmission of the image information and stores the previous reference image frame in the reference image frame buffer 16. It is possible to transfer the contents of the buffer 17 and fetch new image data into the current image frame buffer 4 by the current image update timing control circuit 2 to restart the sequence of the sharpening in sequence. At this time, also on the receiving side, the sharpening control circuit 36 sequentially transfers the contents of the previous image frame buffer 40 to the image display frame buffer, and the sequence is redone.

By the way, when it is desired to perform sharpening when it is necessary to monitor the change of the image every moment, the above-mentioned transmission rate switching command may be sent from the receiving side to the transmitting side. At this time, the transmitting side sequentially transmits the image information of the changed portion with 64 × 64 pixels under the sharpening control circuit 14, and the receiving side interpolates into 256 × 256 pixels to display on the display device 26. Here, a change of 25% results in a code transmission amount of about 0.5 Kbytes, so a momentary change is transmitted in about 5 seconds. When the transmission speed reaches 4800 bits / sec, it will be about 4 times faster. Now, after displaying this momentary change on the receiving side, if a sharpening command is given to the transmitting side, the sequential sharpening sequence operation described above is performed under the control of the sequential sharpening control circuits 14 and 36 on the transmitting and receiving sides. be able to. At this time, a new image has already been captured in the current image frame buffer 4 on the transmitting side, and this image can be sharpened. However, in the present invention, the image displayed on the receiving side is sharpened. Frame buffer 5
The change between frames between the reference image frame buffer 16 and the reference image frame buffer 16 is sequentially sharpened. When the compression of the image of the current image frame buffer 4 has already been completed, the reference image frame buffer 16 is changed from the previous reference image frame buffer 5
After the image data is transferred to, the image is sequentially sharpened.

Also, when the microphone pickup command is sent from the receiving side to the transmitting side, the transmitting side operates the audio circuit 29 for a certain period of time and
The sound collected at 31 can be transmitted to the receiving side to monitor the status of the transmitting side by sound. Also, when a speaker interrogation command is sent from the receiving side, the voice circuit 29 is operated for a certain period of time, and the voice transmitted from the microphone 34 on the receiving side is emitted from the speaker 32 so that an intruder can be called, and an intruder can enter. The person's attention can be directed to the speaker 26 side. If the image pickup apparatus 1 is provided near the speaker 32, it is possible to capture images during or immediately after the speaker is called and transmit them sequentially with sharpness, and preferable images can be transmitted.

When recording the image picked up by the image pickup apparatus 1 in the VTR 42, it is preferable to give a recording command to the control state monitoring circuit 43 to operate the VTR 42.

The resulting output is captured by the image compression circuit 15, and the compression method is switched according to the size of the changed area or the number of changed pixels. That is, when it is determined that the number of changed pixels is less than 25%, the current image frame is compressed and transmitted by the encoding compression method of zero pixels and zero lines.

Next, when the number of changed pixels exceeds 25%, for example, variable sample density compression encoding of inter-frame residual is performed. In this case, since the correlation between pixels of the inter-frame residual is small, a quantization characteristic with a small time difference value is used.

In the case of transmitting the entire image, the determination of the changed pixel is not performed. In addition, the difference between frames updates the image by adding the difference, but when replacing the value of the changed pixel, the changed portion has intra-frame correlation, and this correlation is higher than the inter-frame correlation. The details of the changed portion can be transmitted, and the compression rate can be increased. Since the inter-frame difference is zero, the inter-frame difference of zero pixels is simple, so that the compression and decompression processing can be simplified and the image quality can be improved by sequentially sharpening.

Further, in the case of the compression characteristic of the inter-frame difference compression, when the time difference values are all set to 1 and the DPCM quantization is performed, the edge shift is reduced and the image quality can be improved.
Furthermore, at the stage of 64 × 64 pixels and 128 × 128 pixels for clearing, the amplitude difference value of the quantization characteristic is doubled to widen the dynamic range, thereby transmitting a clearer image of the changing portion. It is possible. Such a quantization characteristic control can be performed by the sequential sharpening control circuit 14.

The change detection circuit 6 removes the sign from the difference between the corresponding image data (8 bits) of the reference image and the current image by an absolute value conversion means, or squares the difference to make the difference into an absolute value, which is used as the coordinate axis. The absolute value of the pixel difference is cumulatively added for each parallel line, and the sum of the absolute value data of the differences on each line parallel to the Y axis is added to the X axis (or it is divided by the number of pixels in one line. ) Is projected, and the total of the data on each line parallel to the X axis is projected on the Y axis, and the minimum and maximum values of X and Y corresponding to the line whose cumulative addition value exceeds the change detection setting level are projected. By detecting the values X ₁ and X ₂ and Y ₁ and Y ₂ , the change area determined by X ₁ ≤X≤X ₂ and Y ₁ ≤Y≤Y ₂ is determined.

[Advantages of the Invention] The present invention is configured such that the current image input from the imaging device and stored in the first frame buffer and the background image stored in the second frame buffer, and the reference image including the previous image. And a communication means for transmitting the current image information through a communication line such as a telephone line and receiving a command from the receiving side when the change is detected by the change detection means. An image composed of a transmitting unit including a receiving unit, a communication unit that receives the current image information received through the communication line and transmits a command, and a receiving unit that includes a unit that restores and displays the received current image information. Forming a monitoring and reporting system and installing a transmitter on the sender side, disaster prevention equipment such as fire extinguishers, fire doors, smoke exhaust devices, crime prevention related equipment such as automatic door locking devices, and receivers installed Commanded by With the control means for controlling these devices, and the receiving part is provided with the means for creating the command, the monitor on the receiving side in the normal state confirms the change state of the monitor area with the image. However, it is possible to operate the disaster prevention related equipment and the crime prevention related equipment, and it is possible to take appropriate processing quickly and surely, and the size, position, movement and shape of the change object detected by the change detection means. Is provided with a means for judging that the detection requirements do not satisfy a predetermined condition, and the device is operated according to the judgment of the judging means, even if the receiving side supervisor is absent or there is no response. There is an effect that it is possible to automatically take measures such as automatic fire extinguishing and automatic locking by judging an abnormality such as a fire occurrence in the monitoring area and the presence of an intruder, and it is possible to reduce damage even when unattended.

In particular, not the analog signal, but the presence of a changing object by comparing the current image input from the image pickup device and stored in the first frame buffer with the background image stored in the second frame buffer and the reference image including the previous image. Is detected,
It is possible to detect advanced changes with few false alarms, and on the transmitting side, fire prevention equipment, fire doors, smoke exhaust equipment, and other disaster prevention related equipment, door automatic locking devices and other crime prevention related equipment, and the receiving side command. Since a control means for controlling these devices is provided and a means for creating a command is provided on the receiving side where the receiving section is installed,
Since it is possible to control the equipment related to disaster prevention and crime prevention on the transmission side by the command from the reception side that is sent via a communication line such as a telephone line, it is possible to build a highly efficient and highly reliable disaster prevention and crime prevention system. There is an effect.

[Brief description of drawings]

FIG. 1 (a) is a circuit block diagram of a transmitter of an embodiment of the present invention, FIG. 1 (b) is a circuit block diagram of a receiver of the above, and FIG. 2 is a change detection operation of a change detection circuit of the same. It is a flowchart, 1 is an imaging device, 6 is a change detection circuit,
Is a communication control circuit, 11 and 19 are circuit control units (NCU), 1
3 and 20 are modems, 43 control status monitoring circuits, 44 disaster prevention monitoring control circuits, 45 setting condition judgment unit, 46 disaster prevention related equipment, 47 automatic door control device, 48 disaster prevention and crime prevention monitoring control circuit.

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Claims (1)

(57) [Claims] 1. The presence of a changing object is detected by comparing a current image input from an image pickup device and stored in a first frame buffer with a background image stored in a second frame buffer and a reference image consisting of a previous image. A change detecting means, a transmitter having communication means for transmitting the current image information through a communication line such as a telephone line when the change is detected by the change detecting means and receiving a command from a receiving side; and the communication line. An image monitoring notification system is formed by a communication unit that receives the current image information received via the communication device and that transmits a command, and a receiving unit that includes a unit that restores and displays the received current image information. On the transmitting side, fire-extinguishing equipment, fire-proof doors, smoke-exhaust equipment, and other disaster-related equipment, and door-automatic locking devices and other security-related equipment,
In the crime prevention and disaster prevention system, which is provided with a control means for controlling these devices according to a command from the receiving side, and is provided with a means for creating the command on the receiving side where the receiving part is installed, the size of the change object detected by the change detecting means. A disaster prevention and crime prevention system characterized in that a means for judging that detection requirements such as position, movement, shape, etc. do not meet predetermined conditions, and the equipment is operated according to the judgment of the judging means.