KR100188430B1 - Image signal intermediate recording/reproducing method of monitoring system - Google Patents

Abstract

The present invention relates to an intermittent recording and reproducing method of a low-motion video in a monitoring system, comprising: sampling and recording alternating odd and even fields at predetermined sampling times; And reconstructing the sampled odd-numbered and even-numbered fields in one frame.

As described above, according to the present invention, as in the prior art, the signal at the same point may be delayed to prevent deterioration of image quality and resolution caused by double use, and compensation for resolution degradation.

Description

Video signal intermittent recording and playback method of surveillance system

FIG. 1A shows an example of a sampling sequence for recording a video signal by a conventional method.

FIG. 1B is a block diagram illustrating a circuit for sampling an image signal by the method shown in FIG. 1A and then generating one frame signal using one field signal.

2A shows an example of a sampling sequence for recording a video signal according to the present invention.

FIG. 2B is a block diagram showing a circuit for sampling an image signal by the method shown in FIG. 2A and generating and outputting one frame signal during reproduction.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to video signal recording and reproducing methods, and more particularly, to a method of intermittently recording and reproducing a video having low motion in a surveillance system.

In general, a surveillance system records a photographed picture on a video tape or a hard disk of a computer in order to leave a record of a surveillance space. A video tape records an analog signal, and recording is generally performed by a time lapse video tape record (time lapse VTR) in the form of an intermittent recording. Surveillance systems are characterized by the fact that most surveillance cameras are used fixedly. This means that the contents of the screen shot are almost the same as the previous screen except for the sudden situation. Therefore, even when recording video signals, intermittent sampling is performed instead of continuous recording.

1A illustrates an example of a sampling sequence for recording a video signal by a conventional method, and the sampling interval may vary depending on the usage environment of the monitoring system. According to FIG. 1A, the same fields (odd or even fields) are sampled in the order of (1)-(2)-(3)-(4). FIG. 1B is a block diagram illustrating a circuit for sampling an image signal by the method illustrated in FIG. 1A and then generating one frame signal using one field signal.

For example, suppose that only the data of the odd field is sampled and recorded in the order of (1)-(2)-(3)-(4) in FIG. 1A, and then an output signal is generated through the circuit of FIG. . In this case, when one frame signal is generated using the odd field of (1), the switching unit 110 uses the original (1) signal as the odd field and stores the odd field signal in the memory 100 to store the ( 1) Delay one horizontal scan time of the signal and then switch to a switching pulse to use the signal stored in the memory as an even field signal. The switched signal is combined with the sync signal generated by the sync signal generator 130 in the adder 120 to be output as one frame signal.

As described above, in the prior art, since the signals of the same field are delayed using a memory and combined to form a frame signal, since the pixels at the same point appear in the form of one horizontal scanning time delay on adjacent lines, image quality deterioration occurs. There is a problem that falls.

Therefore, the present invention was created to solve the above-described problems, and for monitoring that can prevent deterioration of image quality and resolution caused by interpolation scanning using one field as described above, and obtain better image quality. It is an object of the present invention to provide a method for recording and reproducing a video signal of a system.

In order to achieve the above object, the method for intermittently recording a video signal captured by the monitoring system according to the present invention and reproducing the recorded video signal includes an odd field and an even field every predetermined sampling time. Alternately sampling and recording; And play the sampled odd-numbered field and its neighboring even-numbered field as one frame.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 2A illustrates an example of a sampling sequence for recording an image signal according to the present invention, and the sampling interval may vary depending on the usage environment of the monitoring system. FIG. 2B is a block diagram showing a circuit for sampling an image signal by the method shown in FIG. 2A and generating and outputting one frame signal during reproduction.

For example, in FIG. 2A, an odd field is selected and recorded once in the order of (1)-(2)-(3)-(4)-(5)-(6) among the input signals. Next, select and record. Next, the odd field and the even field are alternately selected and recorded by selecting and recording the odd field. The sampling time selection in the input selector 200 of odd and even fields is externally adjustable. As described above, the odd field and the even field are alternately recorded for each field, and when the frame is reproduced, the sampled odd field and the even field are combined to form one frame.

As described above, according to the present invention, when recording a video signal of the surveillance system, the odd field and the even field are alternately sampled and recorded every predetermined sampling time, and the sampled and recorded odd field and neighboring the adjacent field are recorded during frame reproduction. By configuring the even field as one frame, it is possible to prevent deterioration of image quality and resolution caused by using the same point twice and delay the signal at the same point as in the prior art, and to compensate for the resolution deterioration.

Claims (1)

A method of intermittently recording and reproducing an image having a low motion captured by a surveillance system, the method comprising: sampling and recording the image alternately into an odd field and an even field at predetermined sampling time periods; And reproducing and reproducing the sampled odd-numbered field and the neighboring even-numbered field as one frame.