KR0176171B1 - Recording/reproducing apparatus and method thereof - Google Patents

Abstract

The present invention relates to a method of recording and reproducing a digital video system for surveillance, and more particularly, to a method of configuring a frame in reproduction when recording starts from an even field.

Even field determination step for determining whether the start field is being recorded from the even field for the purpose of the present invention, and even field start signal storage step for storing the even field start signal and recording data if the even field is recorded from the even field in the even field determination step. And an even field determination step of determining whether the read data is recorded starting from the even field, an odd field if the even field is started in the even field determination step, and a frame reconstruction processing step of reconstructing and playing the frame with the even field. It is characterized by.

As described above, according to the present invention, in recording and reproducing a digital video system for monitoring, there is an advantage that a frame can be formed without distinguishing even and odd fields.

Description

Method of recording and playback of surveillance digital video system

1 is a block diagram of a frame during recording and playback of a conventional surveillance digital video system.

2 is a block diagram showing a recording and reproducing processing section of the monitoring system of the present invention.

3 is a flowchart of a recording method of the monitoring digital video system of the present invention.

4 is a flowchart of a reproduction method of the monitoring digital video system of the present invention.

The present invention relates to a method of recording and reproducing a digital video system for surveillance, and more particularly, to a method of configuring a frame in reproduction when recording starts from an even field.

In general, a surveillance system stores a photographed image on a video tape or a hard disk of a computer to record a surveillance space. A video tape records an analog signal, and recording is generally performed by a time lapse video tape (Time Lapse VTR) of an intermittent recording tie. In the case of using a hard disk of a computer, the captured image is digitally converted and recorded after compression is performed using still image coding to reduce the recording capacity.

In the conventional digital video surveillance system, as shown in FIG. 1, the odd field and the even field are always recorded. Similarly, during playback, the frame a is constructed only in the order of the odd field and the even field.

FIG. 1 is a block diagram of a frame during recording and reproduction of a conventional digital video system for monitoring, and constitutes one frame (a) of odd field and even field.

However, as shown in FIG. 1, when the recording interval t1 of the odd field and the even field is set to be long, the odd field and the even field are distinguished, and the current even field is input at the start of recording, and the odd number after the elapse of time t1. Recording does not start until the field is entered, which reduces the monitoring function of the monitoring device for t1 hours.

Accordingly, an object of the present invention is to provide a method for constructing a frame without distinguishing between even and odd fields in a recording and reproducing apparatus of a surveillance digital video system.

A recording method of a digital imaging system for monitoring, which constitutes one frame from an odd field and an even field for achieving the above object, the method comprising: an even field discriminating step of determining whether a start field is recorded from an even field;

And an even field start signal storage step of storing the even field start signal and recording data when the even field is recorded from the even field in the even field discrimination step.

A method of reproducing a surveillance digital video system comprising one frame from an odd field and an even field for achieving the above another object, the method comprising: an even field discriminating step of determining whether read data is recorded starting from an even field;

And a frame reconstruction process of reconstructing and reproducing a frame with an odd field and an even field if the field starts with an even field in the even field determination step.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing the recording and reproducing processing section of the monitoring system of the present invention, which is divided into a recording mode and a reproduction mode. First, in the recording mode, one of the video signals provided to a plurality of surveillance cameras (not shown) in the apparatus shown in FIG. 2 is selected and input together with information about the signal, for example, field information. The analog-digital converter 210 converts the input analog signal into a digital NTSC signal. The encoder unit 220 converts the converted digital NTSC signal into a component digital signal of RGB or YCrCb, and the data compressor 230 compresses and encodes the digital signal output from the encoder unit 220. The recording / reading control unit 240 determines a field with respect to the compression-converted signal input from the data compression unit 230, stores the field start signal in the memory unit 250, and stores the compressed signal as a storage medium (not shown). ).

In this case, the memory unit 250 stores information recorded or read in a storage medium to randomly extract data necessary for reproduction and retrieval.

In the next playback mode, the recording / reading control unit 240 reads the field start signal stored in the memory unit 250 and the compressed signal recorded on the tape. The data reconstruction unit 260 receives signal data read from the recording / reading control unit 240 and performs decompression coding. The component digital signal restored through the data recovery unit 260 is converted into an NTSC digital signal by the decoder unit 270. The NTSC digital signal output from the decoder 270 is converted into an analog image signal by the digital-analog converter 280 and provided to a monitor or a receiver.

3 shows a flow chart of the recording method of the surveillance digital imaging system of the present invention, which comprises an even field discrimination step 310 and an even field start signal storage step 330 and 360.

4 is a flowchart of a method of reproducing a digital video system for monitoring according to the present invention, and includes an even field determination step 410 and a frame reconstruction processing step 430 and 460.

In FIG. 2, the component digital video signal after signal conversion in the analog-to-digital converter 210 and the encoder 220 is subjected to the steps as shown in the flowchart of FIG. That is, during recording, the recording / reading control unit 240 determines whether the first field is recorded from the even field from the data information input together with the input video data (step 310). The data is stored in the memory and data is recorded (steps 330 and 360), and the data is recorded if it is being recorded from the odd field.

As described above, the data signal at the time of reproduction after the completion of the recording is subjected to the reproduction step as shown in the flowchart of FIG. That is, the recording / reading control unit 240 determines whether the signal read out to the tape is recorded starting from the even field from the information stored in the memory (step 410). The frames are reconstructed and reproduced in the order of odd fields and even fields (steps 430 and 460). At this time, if the read signal does not start from the even field, the recording / reading control unit 240 starts with the odd field.

As described above, according to the present invention, in recording and reproducing a digital video system for monitoring, there is an advantage that a frame can be formed without distinguishing even and odd fields.

Claims (2)

CLAIMS 1. A recording method of a digital imaging system for monitoring, which comprises one frame from an odd field and an even field, comprising: an even field discriminating step of determining whether a start field is recorded from an even field; And an even field start signal storage step of storing the even field start signal and recording data when the even field is recorded from the even field in the even field discrimination step. A method of reproducing a surveillance digital video system comprising one frame from an odd field and an even field, the method comprising: an even field determination step of determining whether read data is recorded starting from an even field; And a frame reconstruction processing step of reconstructing and reproducing a frame with an odd field and an even field when starting with an even field in the even determination step.