JPH10108165A - Image transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the image transmission system in which image data are transmitted through the use of a low speed transmission line such as a telephone line thereby allowing the operator to sufficiently grasp a state of a monitor object area. SOLUTION: The image transmission system sends image data picked up by a monitor camera 1 to a monitor 6 via a transmission line. The system is provided with an image data split means 8 that splits image data obtained by the monitor camera to generate a plurality of the split image data, a split image comparison means 9 that compares the split image data obtained by the image data split means with preceding split image data based on a preset change discrimination condition, a transmission data generating means 11 that generates transmission data based on the comparison result of the split image comparison means, a communication means 5 that sends data outputted from the transmission data generating means onto the transmission line to be reached to the monitor side, and a monitor 6 that displays the received data as image data or notifies a change in the image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transmission system for processing image data obtained by a remote monitoring operation and transmitting the processed image data to a monitoring side, and in particular, to greatly reduce the amount of data transmitted on a transmission path. To an image transmission system.

[0002]

2. Description of the Related Art Conventionally, such a monitoring system for monitoring the situation of a remote place to perform crime prevention and disaster prevention, etc., is provided at a remote place as shown in FIG. The surveillance camera 102 captures an image of a place (area) to be monitored, and the communication device 103 converts the image data (or image signal) output from the surveillance camera 102 into an analog or digital communication signal. Is transmitted over a transmission line 104 such as a dedicated line or a dedicated line, and is displayed on a monitor device 106 of a monitor device 105 installed in a monitoring room or the like. And the monitor device 10
The operator looking at 6 determines the status of the monitoring target area to determine whether there is an abnormality.

[0003]

The data transmission method in such a remote monitoring system includes long-distance transmission,
Digital systems that are advantageous for multiplex transmission of various types of information are often used. However, if image data is transmitted as it is when transmitting digital image data in a digital format, the amount of data becomes enormous regardless of whether the image is a moving image or a still image.
As 4, a high-speed transmission line such as a dedicated line or a dedicated line must be used, and there is a problem that image data cannot be transmitted using a low-speed transmission line such as a telephone line. The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide an image transmission system that can transmit image data using a low-speed transmission line such as a telephone line, thereby allowing an operator to sufficiently grasp the situation of a monitored area. .

[0004]

According to the present invention, there is provided an image transmission system for transmitting image data picked up by a surveillance camera to a surveillance device via a transmission line. Image data dividing means for generating a plurality of divided image data by dividing the divided image data, and each of the current divided image data and the previous divided image data obtained by the image data dividing means are preset. A divided image comparing means for comparing based on a change determination condition, a transmission data generating means for generating transmission data based on a comparison result of the divided image comparing means, and transmitting data output from the transmission data generating means to a transmission path. Communication means for transmitting the data to the monitoring side and receiving the data on the monitoring side, and displaying the received data as image data or changing the image. Characterized in that a monitoring device for informing. Further, the transmission data generating means generates and outputs only changed image data among the divided image data as transmission data.
Further, the transmission data generating means generates and outputs divided image data having changed among the divided image data as changed information and non-changed divided image data as changed information.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a block diagram showing a monitoring system using the first embodiment of the image transmission system according to the present invention. The surveillance system shown in FIG. 1 is a surveillance camera 1 such as a CCD camera or an infrared camera which is provided at a remote place and captures an image of a surveillance target, and extracts a change in image data obtained by the surveillance camera 1 to generate data. A change extracting unit 2; a communication unit 3 for sending an output from the change extracting unit 2 to a transmission line 4; a communication unit 5 for receiving a signal transmitted from a remote place via the transmission line 4; And a monitor device 7 connected to the monitor device 6. The monitor camera 1 captures an image of an area to be monitored while the change extracting unit 2 captures an image obtained from the monitor camera 1. It is determined whether or not the data has changed, and this determination result is transmitted to the monitoring device 6 provided in the monitoring room and displayed on the monitoring device 7. The change extracting unit 3 includes an image data dividing unit 8 that divides the image data obtained by the surveillance camera 1 to generate a plurality of divided image data, and a current divided image data obtained by the image data dividing unit. A divided image comparing unit 9 for comparing the divided image data with the previous divided image data based on a preset change determination condition (for example, whether the divided image data has changed to a predetermined threshold or more); And a transmission data generation unit 11 for generating transmission data based on the comparison result of the divided image comparison unit 9. The transmission data generation unit 11 Only the changed divided image data among them is generated and output as transmission data.

Next, the operation of this embodiment will be described with reference to the schematic diagram shown in FIG. First, each time new image data is supplied from the monitoring camera 2, the change extracting unit 3 divides the new image data to generate first to fourth divided image data as shown in, for example, (a) and (b). After that, the first to fourth divided image data are compared with the previous first to fourth divided image data stored in the memory means 10, respectively. At this time, one of the current first to fourth divided image data,
For example, if there is a change in the current second divided image data, only this second divided image data is transmitted to the communication means 3 as transmission data as shown in FIG.
Is transmitted to the monitoring device 6 via the. As shown in (d) and (e), the monitoring device 6 performs image processing on the received data to reproduce the second divided image data, and first, third, and fourth image data among the previously captured image data. The entire image data is generated together with the divided image data, and is output to the monitor device 7. That is, the newly captured image data is only the second divided image data, and the other divided image data uses the data that was previously captured. Therefore, the same image (f) as the image at the time of imaging is displayed on the monitor device 7. The image displayed in this manner is monitored by the operator, and it is determined whether or not the monitored area has changed.

Next, a description will be given of a second embodiment of the image transmission system according to the present invention. FIG. 3 and FIG.
FIG. 2 is a block diagram showing a monitoring system using the embodiment. A surveillance system 21 shown in FIG. 1 includes a surveillance camera 22 such as a CCD camera or an infrared camera which is provided in a remote place and photographs a surveillance area, and extracts a change in image data obtained by the surveillance camera 22 to make a telephone call. A change extracting device 23 for transmitting the data on a transmission line 24 such as a line;
And a monitoring device 26 for displaying the change presence / absence information reproduced by the monitoring device 25.
While the monitoring target area is photographed by 2, it is determined by the change extracting device 23 whether the image data obtained by the monitoring camera 22 has changed, and this determination result is sent to the monitoring device 25 provided in the monitoring room. The data is transmitted and displayed on the monitor device 26.

The change extracting device 23 includes an image data dividing circuit 27 for dividing the image data obtained by the monitoring camera 22 into a plurality of image data (first to fourth divided image data);
Each time new first to fourth divided image data is output from the image data dividing circuit 27, an image memory circuit 28 that takes in and stores the new first to fourth divided image data, and a new first to fourth divided image from the image data dividing circuit 27. Each time data is output, the previous first to fourth divided image data stored in the image memory circuit 28 are read out, compared with each other, and set in advance with a change determination condition (for example, a monitoring target object). Of the divided image data that satisfies whether or not the image data has changed to a predetermined value or more, the divided image data is converted into information indicating a change (such as information indicating a bit “1”). A change judging circuit 29 for converting the divided image data into no-change information (information indicating a bit “0”), and a conversion result of the change judging circuit 29 A communication circuit 30 for transmitting the serial monitor chamber side
And

With this configuration, in the change extracting device 23, each time new image data is output from the monitoring camera 22, the new image data is divided to generate first to fourth divided image data. The first to fourth divided image data is compared with the previous first to fourth divided image data, and the divided image data that satisfies a preset change determination condition is converted into change-informed information. The other divided image data is converted into no-change information, and these changed information and no-change information are transmitted on the transmission path 24.
The data is transmitted to the monitoring device 25 in the monitoring room. The monitoring device 25
The communication circuit 31 includes a communication circuit 31 for receiving the change information and the no change information transmitted on the transmission line 24, and a display circuit 12 for converting the change information and the no change information received by the communication circuit 31 into display data. When change information or no change information is supplied via the transmission line 24, the information is received and converted into display data, and this is displayed on the monitor device 26.

Next, the operation of this embodiment will be described with reference to the block diagram shown in FIG. 3 and the schematic diagram shown in FIG.
First, each time new image data is output from the surveillance camera 22, the change extraction device 23 uses the change extraction device 23 in FIG.
The image data is divided into first to fourth divided image data as shown in FIG.
The fourth divided image data and the stored first to fourth previous
Each of the divided image data is compared. At this time, any of the current first to fourth divided image data, for example, the current second divided image data and the previous second divided image data may satisfy a preset change determination condition. For example, as shown in (c) and (d) of FIG. 4, the current second divided image data is converted into the changed information. At this time, as shown in (e) and (f) of FIG. 4, the current first, third, and fourth divided image data and the previous first, third, and fourth divided image data are determined to change. If not,
The current first, third, and fourth divided image data are converted into no-change information.

Thereafter, as shown in FIG. 4 (g), the information with change and the information without change obtained by this conversion operation are transmitted through the transmission line 2.
4 and transmitted to the monitoring device 25 on the monitoring room side. The monitoring device 25 converts these changed information and no change information into display data, and
The operator is informed whether there is a change in the monitored area displayed above and captured by the monitoring camera 22. Thus, in this embodiment, every time new image data is output from the monitoring camera 22,
After dividing this into first to fourth divided image data, the first to fourth divided image data are compared with the previous first to fourth divided image data, and a predetermined change determination condition is set. The divided image data that satisfies the above is converted into change-informed information, and the other divided image data is converted into non-changed information, and these changed-information and non-changed information are transmitted over the transmission line 24. In addition, the presence or absence of a change is displayed on the monitor device 26 by the monitoring device 25 in the monitoring room, so that even when a low-speed transmission line such as a telephone line is used as the transmission line 24, the operator can monitor the area to be monitored. The situation can be fully understood. In the embodiment described above, the monitoring camera 22
The current image data output from the
Is divided into four, but as the number of divisions,
Numerical values other than “4”, for example, 6, 8,... May be used.

[0012]

As described above, according to the present invention, even when a low-speed transmission line such as a telephone line is used, the contents of the object to be monitored are displayed on the monitor device installed in the monitoring room. This allows the operator to fully understand the status of the monitoring target area.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a monitoring system using an embodiment of an image transmission system according to the present invention.

FIG. 2 is a schematic diagram showing an example of image processing performed in the image transmission system shown in FIG.

FIG. 3 is a block diagram illustrating an example of a monitoring system using a second embodiment of the image transmission system according to the present invention.

FIG. 4 is a schematic diagram illustrating an example of image processing performed by the image transmission system illustrated in FIG. 3;

FIG. 5 is a block diagram showing an example of a conventionally known monitoring system.

[Explanation of symbols]

1 ... surveillance camera, 2 ... change extraction unit, 3 ... communication means, 4
... transmission line, 5 communication means, 6 monitoring device, 7 monitoring device, 8 image data dividing means, 9 image division comparing means, 10 memory means, 11 transmission Data generation means, 2
DESCRIPTION OF SYMBOLS 1 ... Monitoring system, 22 ... Surveillance camera, 23 ... Change extraction device, 24 ... Transmission line, 25 ... Monitoring device, 26 ... Monitor device, 27 ... Image data division circuit, 28 ... Image memory circuit, 29 ... Change judgment circuit , 30 communication circuit, 31 communication circuit, 32 display circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04N 5/225 H04N 5/225 F

Claims (3)

[Claims] 1. An image transmission system for transmitting image data captured by a monitoring camera to a monitoring device via a transmission path, wherein the image data obtained by the monitoring camera is divided to generate a plurality of divided image data. Divided image comparing means for comparing each of the current divided image data obtained by the image data dividing means with the previous divided image data based on a preset change determination condition; Transmission data generation means for generating transmission data based on a comparison result of the divided image comparison means; transmitting data output from the transmission data generation means on a transmission path and transmitting the data to a monitoring side; And a monitoring device that displays the received data as image data or notifies a change in image. Image transmission system for. 2. The image transmission system according to claim 1, wherein said transmission data generating means generates and outputs only changed image data among the divided image data as transmission data. 3. The transmission data generating means generates and outputs divided image data that has changed among the divided image data as changed information and non-changed divided image data as unchanged information. The image transmission system according to claim 1, wherein: