KR20030028900A - Time lapse video cassette recorder - Google Patents

Abstract

PURPOSE: A time lapse video cassette recorder is provided to automatically change the resolution for recording or reproducing according to the motion change of image signals, thereby precisely monitoring sections having the motion change conveniently. CONSTITUTION: A time lapse video cassette recorder includes a switching part(120) for selectively outputting image signals transmitted by a plurality of cameras(110), a recording/reproducing part(130) for recording the image signals output from the switching part to a recording medium by a predetermined resolution based on A/V data per frame and reproducing the image signals by a predetermined resolution based on the A/V data, a motion detecting part(160) for detecting the motion change of the image signals by the comparing between the image signals input from the switching part or the recording/reproducing part with reference recording or reproducing signals, and a control part(140) for changing the A/V data to change the resolution according to the motion change and transmitting the changed A/V data to the recording/reproducing part.

Description

TIME LAPSE VIDEO CASSETTE RECORDER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time lapse video cassette recorder (VCR), and more particularly, to a time lapse VCR in which the resolution is changed during recording and playback according to whether a motion change of a video signal is detected. .

Time Lapse VCR is installed in major facilities such as banks and museums, and is mainly used for long-term surveillance to prevent theft. One frame is recorded every selected interval.

As shown in FIG. 1, the time-lapse VCR according to the related art has a switching unit 20 for selectively outputting video signals transmitted from an external photographing apparatus such as a plurality of cameras 10, and an output from the switching unit 20. A recording / playback unit 30 for recording a video signal on a tape frame by frame and reproducing the recorded video signal, and the selected camera 10 output from the switching unit 20 according to a user's selection through the input unit 50. And a controller 40 which controls the recording / playback unit 30 to record only one frame video signal of the video signals of the video signal and controls the playback process of the video signal by the recording / playback unit 30.

For example, if a user wants to record 48 hours using a 2 hour tape, the switching unit 20 receives a video signal from the first camera 1, and a time corresponding to 24 frames (24 × 1/30) is When the elapsed time, the camera 2 switches to the camera 2 to receive the video signal, and repeatedly outputs the video signal from each camera 10 at predetermined time intervals.

The controller 40 controls the progress of the tape of the recording / playback unit 30 to record only one specific frame of the video signal of a predetermined amount of time input by the switching unit 20, and the user selects it through the input unit 50. The recording / reproducing section 30 is controlled to reproduce the video signal recorded on the tape.

On the other hand, the input unit 50 is provided with a high resolution mode selection switch (not shown). When the user selects the high resolution mode selection switch, the control unit 40 changes and records the A / V data that determines the image quality during recording and playback. Transfer to regeneration unit 30. At this time, in the recording mode, the A / V data such as the carrier, the EQ, and the current are changed to match the high resolution recording, and in the playback mode, the A / V data such as the EQ and the picture control are changed to match the high resolution playback.

When a crime such as unauthorized intrusion occurs in a security facility equipped with the Time Lapse VCR, the Time Lapse VCR functions as a security system because the intruder's actions are recorded on the recording medium of the Time Lapse VCR.

However, as described above, the conventional time-lapse VCR records and plays back a video signal input from an external photographing apparatus at a constant resolution regardless of whether a moving object is monitored. There was a need to manually operate the mode selector switch.

SUMMARY OF THE INVENTION The present invention has been proposed to solve such a conventional problem, and an object thereof is to provide a time-lapse VCR that automatically changes the resolution at the time of recording and playback depending on whether a motion change of a video signal is detected.

The type labs VCR of the present invention for achieving the above object comprises a switching unit for selectively outputting video signals transmitted from a plurality of external photographing apparatuses, and a video signal output from the switching unit based on A / V data. A recording / reproducing unit for recording frame by frame on a recording medium at a predetermined resolution, and reproducing an image signal stored on the recording medium at a predetermined resolution based on A / V data; and inputting from the switching unit or the recording / reproducing unit. The motion detection unit detects and outputs a change in motion of the video signal by comparing the video signal with a pre-stored recording reference signal or a reproduction reference signal, and the video signal of the selected camera output from the switching unit according to a user's selection through the input unit. The resolution may be changed according to whether the motion change is detected by the motion detector. And a controller for changing the A / V data and transferring the A / V data to the recording and reproducing section.

1 is a block diagram of a time-lapse video cassette recorder according to the prior art;

2 is a block diagram of a time-lapse video cassette recorder according to the present invention;

3 is a block diagram illustrating a motion detection unit shown in FIG. 2;

4 is a flowchart illustrating a recording and playback process of a time-lapse video cassette recorder according to the present invention.

<Description of the symbols for the main parts of the drawings>

110: camera 120: switching unit

130: recording and playback section 140: control section

150: input unit 160: motion detection unit

161: Y / C Separator 162: A / D Converter

163: comparator 164: frame memory

There may be a plurality of embodiments of the present invention. Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings. This embodiment allows for a better understanding of the objects, features and advantages of the present invention.

As shown in the block diagram of FIG. 2, the time-lapse VCR according to the present invention includes a camera 110, a switching unit 120, a recording / reproducing unit 130, a control unit 140, an input unit 150, and a motion detection unit ( 160).

The switching unit 120 selectively outputs an image signal transmitted from an external photographing apparatus such as a plurality of cameras 110.

The motion detector 160 detects and outputs a motion change of the video signal by comparing the video signal input from the switching unit 120 with the pre-stored recording reference signal, and outputs the video signal being reproduced by the recording / reproducing unit 130. The change of the motion of the video signal is detected and output through comparison with the stored reproduction reference signal.

The controller 140 may change the resolution of the image signal of the selected camera 110 output from the switching unit 120 according to the user's selection through the input unit 50 according to whether the motion detection unit 160 detects a motion change. The A / V data is changed and transferred to the recording / playback unit 130.

The recording / reproducing unit 130 records the video signal output from the switching unit 120 on a recording recording medium (for example, tape) at low resolution based on the A / V data by the controller 140, and records the recording signal. During the reproduction of the video signal recorded on the medium, the video signal recorded on the recording recording medium is reproduced at high resolution based on the A / V data by the controller 140.

As shown in the block diagram of FIG. 3, the motion detector 160 includes a Y / C separator 161, an A / D converter 162, a comparator 163, and a frame memory 164.

The Y / C separator 161 separates the video signal input from the switching unit 120 or the recording / reproducing unit 130 into a luminance signal and a chroma signal.

The A / D converter 162 converts and outputs the analog luminance signal separated by the Y / C separator 161 into digital luminance data.

The frame memory 164 selects the digital luminance data output from the A / D converter 162 under the control of the controller 140 and stores the digital luminance data as a recording reference signal and a reproduction reference signal.

The comparator 163 controls the current digital luminance data output from the A / D converter 162 and previous digital luminance data stored in the frame memory 164 under the control of the controller 140, that is, the recording reference signal or the reproduction reference signal. Compare the to selectively output the motion detection signal to the control unit 140.

The recording and reproducing process by the time-lapse VCR according to the present invention configured as described above will be described with reference to FIG.

First, in the recording mode, the switching unit 120 selectively outputs the video signals transmitted from the plurality of cameras 110 based on the control signal of the control unit 140.

Then, the Y / C separator 161 of the motion detector 160 separates the image signal input from the switching unit 120 into a luminance signal, which is a black and white image signal, and a chromaticity signal representing color, and the A / D converter 162. In operation S401, the analog luminance signal separated by the Y / C separator 161 is converted into digital luminance data.

The comparator 163 compares the current digital luminance data output from the A / D converter 162 with previous digital luminance data stored in the frame memory 164, that is, a recording reference signal, which is recorded in the frame memory 164. If there is no reference signal, that is, at the start of recording, the digital luminance data output from the A / D converter 162 is bypassed and stored in the frame memory 164 (S402 to S403).

Here, the comparator 163 compares the currently detected digital luminance data with the recording reference signal and outputs a motion detection signal only when there is a change in data.

The controller 140 controls the recording process of the recording / playback unit 130 according to whether or not the motion detection signal is output by the comparator 163. When the motion detection signal is not output, the recording / reproducing unit 130 displays an image. A / V data corresponding to the signal is recorded at low resolution, and when the motion detection signal is output, the controller 140 stores the currently detected digital luminance data in the frame memory 164 to detect the recording reference signal. In addition, the A / V data is outputted to record the frame image signal in which the motion is detected in high resolution. At this time, the A / V data changed according to the resolution includes a carrier, an EQ, a current, and the like (S404).

Then, when the motion detection signal is not output by the motion detection unit 160, the recording / reproducing unit 130 records the video signal at a low resolution based on the A / V data by the control unit 140 (eg, a tape). Frame by frame (S405 to S407), and when a motion detection signal is output, video signals are recorded on a recording medium in high resolution on a recording medium according to A / V data by the controller 140 (S403). S407).

Next, in the recording mode in which the user requests the reproduction of the recorded video signal through the input unit 150, the recording / reproducing unit 130 controls the video signal recorded on the recording medium in units of frames by the control of the controller 140. Output

Then, the Y / C separator 161 of the motion detector 160 separates the video signal input from the recording and playback unit 130 into a luminance signal, which is a black and white video signal, and a chromaticity signal representing color, and the A / D converter 162. ) Converts the analog luminance signal separated by the Y / C separator 161 into digital luminance data (S401).

The comparator 163 compares the current digital luminance data output from the A / D converter 162 with the previous digital luminance data stored in the frame memory 164, that is, the reproduction reference signal, which is reproduced in the frame memory 164. When there is no reference signal, that is, at the start of reproduction, the digital luminance data output from the A / D converter 162 is bypassed and stored in the frame memory 164 (S402 to S403).

Here, the comparator 163 compares the currently detected digital luminance data with the reproduction reference signal and outputs a motion detection signal only when there is a change in data.

Then, the controller 140 controls the reproduction process of the recording and reproducing unit 130 according to whether or not the motion detection signal is output by the comparator 163. If the motion detection signal is not output, the recording and reproducing unit 130 is performed. Outputs A / V data corresponding to the video signal at low resolution, and when the motion detection signal is output, the controller 140 stores the currently detected digital luminance data in the frame memory 164 to provide a reproduction reference signal. In addition to the detection signal, A / V data is output to match the detected frame image signal in high resolution. At this time, the A / V data changed according to the resolution includes EQ, picture control, etc. (S404).

Then, when the motion detection signal is not output by the motion detection unit 160, the recording and reproducing unit 130 reproduces the video signal in low resolution based on the A / V data by the control unit 140 (S405 to S407). When the motion detection signal is output, the video signal is reproduced in high resolution based on the A / V data by the control unit 140 (S403 to S407).

In the above description, but limited to one embodiment of the present invention, it is obvious that the technology of the present invention can be easily modified by those skilled in the art. Such modified embodiments should be included in the technical spirit described in the claims of the present invention.

As described above, the present invention automatically changes the resolution at the time of recording and playback according to whether the motion signal of the video signal is detected, so that the user can observe the important section having the motion change in detail without any effort, so that the motion state of the monitored object can be accurately determined. There is an effect that can be grasped.

Claims (2)

A switching unit for selectively outputting video signals transmitted from a plurality of external photographing apparatuses; The video signal output from the switching unit is recorded frame by frame on a recording medium at a predetermined resolution based on A / V data, and the video signal stored on the recording medium is reproduced at a predetermined resolution based on A / V data. Recording and playback unit A motion detector which detects and outputs a change in motion of the video signal by comparing the video signal input from the switching unit or the recording and playback unit with a pre-stored recording reference signal or reproduction reference signal; A control unit for changing the A / V data and transmitting the image signal of the selected camera output from the switching unit according to the user's selection through the input unit to the recording / reproducing unit so that the resolution is changed according to whether the motion detection unit detects the change in motion. Including a time lapse video cassette recorder. The method of claim 1, wherein the motion detector A Y / C separator for separating the video signal input from the switching unit or the recording / reproducing unit into a luminance signal and a chroma signal; An A / D converter converting and outputting the analog luminance signal separated by the Y / C separator into digital luminance data; A frame memory for selecting digital luminance data output from the A / D converter under the control of the controller and storing the digital luminance data as the recording reference signal or the reproduction reference signal; And a comparator for selectively outputting a motion detection signal to the controller by comparing the digital luminance data output from the A / D converter with the recording reference signal or the reproduction reference signal stored in the frame memory under the control of the controller. Time-lapse video cassette recorder characterized in that.