JP3435746B2 - Remote monitoring device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention compresses an image inputted from a surveillance camera, transmits the image to another station through a line, and performs decompression operation and image processing at a monitoring station on the receiving side. The present invention relates to a remote monitoring device for restoring and monitoring data. [0002] In a remote monitoring device, when a change occurs in the subject, it is desirable that the change and the status be analyzed at a high speed to notify the status. [0003] In a conventional remote monitoring apparatus, all monitored image data is compressed and transmitted at a monitored station, and received data is restored at a monitoring station. The data is compared with each other, and the state change is determined based on the difference, or the state change is detected by monitoring the restored video on a monitor. [0004] Therefore, in the prior art, the line utilization rate increases because compressed data must always be transmitted, and cost addition and the line sharing rate of the receiving monitoring station are increased. In addition, there is a problem that the time required for determining a state change increases, and there is a limit to the versatility of a remote monitoring device that recognizes an image change. According to the present invention, when a change occurs in a subject,
It is an object of the present invention to provide a remote monitoring device capable of analyzing and notifying the change state at a high speed. In order to achieve the above object, as shown in FIG. 1, a plurality of surveillance cameras 11a to 11c are used to monitor images of a remote place. In the monitored station 10 having a video processing unit 12 for digitally converting video data, and a compression calculation unit 13 for compressing output data of the video processing unit 12 by the ADCT method and compressing a data amount of image information, An operation result storage memory for storing the ADCT compression operation result output from the compression operation unit 13
14, a data comparison that compares the current DC component value output from the compression operation unit 13 with the previous DC component value output from the operation result storage memory 14, and transmits the captured image data only when a difference is detected. The unit 15 is configured to be provided. According to the present invention, as shown in FIG. 1, a plurality of surveillance cameras are provided.
When monitoring video data of a remote place photographed using 11a to 11c or the like, the video processing unit 12 converts the video data into digital data, and the compression operation unit 13 performs the video processing unit.
The output data from 12 is subjected to a compression operation by the ADCT method, and the operation result is calculated. Further, an operation result storage memory 14 and a data comparison unit 15 are provided, and the operation result storage memory 14 stores the ADCT compression operation result output from the compression operation unit 13. The current DC component value output from the compression operation unit 13 and the previous DC component value output from the operation result storage memory 14 are compared, and the captured image data is transmitted only when a difference is detected. Therefore, by transmitting the video data only when a difference is found in the comparison in the data comparing section 15, it is possible to perform video transmission quickly. An embodiment of the present invention will be described below with reference to FIGS. First, the basic operation of the present invention will be described with reference to FIG. FIG. 1 shows a configuration of a circuit according to an embodiment of the present invention, in which the configurations of a monitored station and a monitoring station are described. In FIG. 1, reference numerals 11a, 11b, 11c and 12 to 16 denote circuits constituting a monitored station 10 provided on the transmitting side.
11a, 11b, and 11c are monitoring cameras, 12 is a video processing unit, 13 is a compression operation unit, and 14 is an operation result storage memory. Note that reference numeral 15 denotes a data comparison unit, and reference numeral 16 denotes a data transmission control unit. Further, 21 to 24 are monitoring stations provided on the receiving side.
Reference numeral 21 denotes a circuit constituting a data reception control unit; 22, a decompression operation unit; 23, a monitor display control unit; and 24, a monitor. For example, three monitoring cameras 11a and 11 provided in the monitored station 10
The video signals captured by the b and 11c are converted into digital signals by the video processing unit 12 and the data are arranged based on information such as the shooting positions of the monitoring cameras 11a, 11b and 11c.
Is input to The compression operation section 13 converts the input data into, for example, A
The compression operation is performed using the DCT method, and the direct current (DC) component of the ADCT compression operation result is stored in the operation result storage memory 14. ADCT (adaptive discrete cosine transf
orm) is an adaptive discrete cosine method, and using this method has the effect of reducing the amount of coded information in information compression of still images. At this time, in the monitoring initial state, only the notification of the initial data transfer and the data of the ADCT compression operation are transmitted from the data transmission control unit 16 to the monitoring station 20. After Δt seconds, imaging, digital conversion of data, and ADCT compression of digital data are performed as a series of processing by the surveillance cameras 11a, 11b, and 11c to the compression operation unit 13. The data is compared with the data, the difference between the data is calculated, and the change in the state of the image, that is, the abnormality is detected. When the difference amount is determined based on a certain standard and it is determined that a state change notification is necessary, the data transmission control unit 16 transmits the notification of the state change and the compressed operation data of the updated video to the monitoring station 20. Send. On the other hand, in the monitoring station 20, when the received data is received by the data reception control unit 21, the received data is restored by the decompression operation unit 22 at the time of initial transmission, and the monitor display control unit 23 To convert the image signal into a video signal and display it on the monitor 24 of the monitoring station 20. Similarly, when the received data received by the data reception control unit 21 is a notification of the state change and the compressed operation data of the updated video, the data is restored by the decompression operation unit 22 and the monitor display control unit The image signal is converted into a video signal at 23, and the monitor 24 of the monitoring station 20 performs display as a screen on which a state change has occurred. In the above-described embodiment, the judgment of the state change using the DC component is shown as the comparison in the data comparing section 15. However, the comparison in the data comparing section 15 may be used together with the AC component in accordance with the time. Alternatively, the state change may be determined for each component of an image according to the subject to be monitored. Hereinafter, the present invention will be described in detail with reference to FIGS. FIG. 2 is a diagram showing matrix components after the ADCT operation, and shows data obtained by processing 8 dots × 8 lines in one screen. As shown in FIG. 2, the range of the horizontal frequency of the video signal is divided into eight stages, and the range of the vertical frequency of the video signal is
The ADCT operation is performed using 64 samples for each 8 × 8 pixel block.
It is called T coefficient. The ADCT coefficients are arranged in an 8 × 8 block as shown in FIG. In FIG. 2, the shaded portion indicates the average value of the whole, which is called a DC coefficient. Other parts (parts indicated by dots) are called AC coefficients. The image restoration is performed using the DC coefficient component and the AC coefficient component, and the abnormality detection can be speeded up by using the DC coefficient component before the restoration to determine the abnormality detection. In the AC coefficient, information is concentrated on the smaller coordinate axis, and by comparing the AC components using the concentrated information, the abnormality detection process can be performed faster. FIG. 3 is a diagram showing a first processing example in the circuit of one embodiment of the present invention, and shows the processing contents of the video processing unit 12, the compression operation unit 13, and the data comparison unit 15. 1 In FIG.
In the video processing unit 12, Y / C separation of video data input from the monitoring camera 11 (Y is a luminance component, C is a color difference component)
And the component Y and the component Cr (=
RY) and a component Cb (= BY),
This separation component is sent to the compression operation unit 13. The compression operation unit 13 performs Y operation, Cr operation and Cb operation using the ADCT operation on the component Y and the separated component of the component Cr and the component Cb input from the video processing unit 12, and calculates the calculated DC value. To the data comparison unit 15. The data comparator 15 compares the previous data (video data one cycle before) and the current data (current video data) with respect to the three calculation components Y, Cr, and Cb input from the compression calculator 13. Are compared, and a comparison result for each component is obtained. With respect to the comparison result for each component, an abnormality detection determination method is weighted and selected based on the mode setting corresponding to the importance specified by the user (which component information has priority, etc.). The abnormality detection of the comparison result for each component is determined, and the determination result is sent to the data transmission control unit 16. FIG. 4 shows a second embodiment of the circuit according to the present invention.
FIG. 9 is a diagram illustrating a processing example, and illustrates a processing operation of the data comparison unit 15; The data comparing section 15 performs the DC component and AC component data input from the compression calculating section 13 at predetermined time intervals (n times for the DC component and for the AC component) based on the instruction of the abnormality detection determination method switching section 150. Is performed m times) to perform the abnormality detection determination by switching between the DC component comparison determination and the AC component comparison determination, so that the AC component comparison determination can cope with a change that is discarded by the DC component comparison determination alone. Error detection judgment method switching unit
It is conceivable that the switching method of 150 is not simply fixed to the time but the switching method is changed so as to obtain the optimum abnormality detection in consideration of the pre-determination result (for example, the tendency of the comparison data). FIG. 5 shows a third embodiment of the circuit according to the present invention.
FIG. 9 is a diagram illustrating a processing example, and illustrates a processing operation of the data comparison unit 15; In the data comparison section 15, for example, in the case of a monitor video of pixels of m dots × n lines, the image 1 process performs arithmetic processing in units of 8 × 8 pixels (8 × 8 is hereinafter referred to as a block). At this time, for example, when a change is recognized based on the DC component value of the x-th block, the control of the surveillance camera 11a and the like is performed, and information such as zooming on the subject in the next process is calculated. As is apparent from the above description, according to the present invention, in a multi-pole remote monitoring apparatus for recognizing a video change, when a change occurs in the subject, the change status can be changed at a high speed. This has the effect that a remote monitoring device that analyzes and informs the status can be constructed while reducing the line efficiency and the amount of memory used for comparison.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a configuration of a circuit according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a matrix component after an ADCT operation. FIG. FIG. 4 is a diagram showing a processing example. FIG. 4 is a diagram showing a second processing example in the circuit of one embodiment of the present invention. FIG. 5 is a diagram showing a third processing example in the circuit of one embodiment of the present invention. Monitoring stations 11a to 11c Monitoring camera 12 Video processing unit 13 Compression operation unit 14 Operation result storage memory 15 Data comparison unit 16 Data transmission control unit 20 Monitoring station 21 Data reception control unit 22 Decompression operation unit 23 Monitor display control unit 24 Monitor

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Claims (1)

(57) [Claim 1] An image processing unit for digitally converting the image data in order to monitor an image of a remote place photographed using a plurality of surveillance cameras and the like, and the image processing unit and the compression operation by the output data of the ADCT method in the monitored station with the compression operation unit for performing data compression amount of the image information, and the operation result storage memory for storing the ADCT compression operation result output from the compression operation unit the DC component value output from the compression operation unit n times, low frequency near
Switch the AC component value beside every predetermined time m times, the DC component value or a previous AC component of the previously output the DC component value or the AC component values from the calculation result storage memory
Comparing the value of each remote monitoring device, characterized in that a data comparison unit for transmitting the image data taken only if differencing.