KR20030024114A - Digital video recording method in a motion detection mode - Google Patents

Abstract

PURPOSE: A method for recording a digital image in a motion detection mode is provided to obtain information of video data important in an unmanned security system and efficiently manage storage capacity of a storage medium. CONSTITUTION: A central processing unit receives a signal from a key input part and judges whether the signal is a motion detection mode signal(S201). If not, the central processing unit receives video data photographed in a general mode through a decoder and a codec for recording the video data at a storage medium(S202). If so, the central processing unit judges whether an operation signal is input from a sensor attached to a camera(S203). If not input, the central processing unit stops recording the video data(S204). If input, the central processing unit records the video data at the storage medium at high speed and high quality(S205). The central processing unit judges whether the operation signal is continuously input from the sensor(S206). If not, the central processing unit stops recording the video data(S207). If input, the central processing unit records the video data, changing recording speed and quality(S208).

Description

Digital video recording method in motion detection mode {DIGITAL VIDEO RECORDING METHOD IN A MOTION DETECTION MODE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video recording method. In particular, when a motion is captured in a motion detection mode, which is a recording mode, a motion of gradually recording a video data recorded from a camera from the highest speed to a normal mode is recorded. The present invention relates to a digital video recording method in detection.

The unmanned security system is mainly used as a control system that operates by connecting security devices and automation devices installed in large apartment houses or high-rise buildings, and is used to detect intruders who intrude into homes or buildings and detect fires early. It is a system that can be monitored through a monitor displayed at a remote place after connecting a fire detection sensor to a computer in an entrance, a window or an area where a fire is likely to occur, or an area where a fire can be easily detected.

An example of an unmanned security system is the Time Lapse Video Tape Recorder, which is installed in major areas such as banks and museums and is used for long-term surveillance to prevent theft. Instead of recording the transmitted video screen in full frame in real time, one frame is recorded at a predetermined time interval selected from the real-time video screen transmitted while repeating driving and stopping of the recording tape by the capstan motor of the recording unit. Attempt to reproduce the video signal recorded in the recording unit by controlling the capstan motor of the recording unit to advance the tape in the image frame unit to read the video frame recorded on the recording tape, the recording and playback of the video frame is set by the user Depending on the mode at regular intervals As a result, intermittent recording and reproduction of the video signal was performed.

The management operator of the video recording player is very cumbersome because the recording tape needs to be replaced periodically, and there is a problem that a separate external device must be provided in order to perform special functions such as multi-recording and playback screen division.

In order to solve this problem, a digital video recorder (DVR) using a digital recording medium rather than an analog recording tape has been developed, which digitally records an image on a recording medium such as a memory. By reproducing and reproducing, the recorded data can be almost semi-permanently preserved without damaging the recording medium, and it is an expensive device that can perform special functions such as multiple recording and playback screen division without a separate external device.

The recording mode of such a digital video recording device includes a normal mode with a recording speed of 5 frames per second, a picture quality of 5 kilobytes per frame, a high speed mode with a recording speed of 20 frames per second, and a picture quality of 20 kilobytes per frame, and a recording speed. Is a high-speed mode with 30 frames per second and image quality of 20 kilobytes per frame, a medium speed mode with a recording speed of 10 frames per second, and a video quality of 10 kilobytes per frame, and a mode set before motion detection mode whenever motion is detected. There is a motion detection mode for recording.

Here, the motion detection mode, which is a recording mode of the digital video recording device, is a mode for recording video data photographed by a camera according to an intruder's intrusion in an unmanned security system, and is an important function in an unmanned security system that is a purpose of a digital video recording device.

However, in the case of the above and the motion detection mode, by recording entirely according to the previous setting, when the previous setting is ultra-fast mode, the high quality in the image quality can be obtained, but there is a problem that the storage capacity of the storage medium becomes large and occupies a large portion. In this general mode, the amount of data that can be stored in the storage medium may be increased, but there is a problem in that the important screen (for example, information about the intruder) cannot be provided in detail.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art, and when motion is detected during recording in a motion detection mode, image data is recorded at high speed and high quality, and after a predetermined time, the image data gradually becomes a normal mode. To provide a digital video recording method in the motion detection mode for recording the.

In order to achieve the above object, the present invention provides a digital image in a motion detection mode using a camera attached to a sensor and generating a motion signal when a motion is detected, and a storage medium for recording image data photographed by the camera. In the recording method, determining whether the operation signal is generated from the sensor of the camera, and when the operation signal is generated, the image data photographed by the camera at a recording speed and image quality of ultra-fast and high quality for a predetermined time Recording on the storage medium, determining whether an operation signal is generated from a sensor of the camera after the preset time elapses, and stopping recording of image data photographed by the camera based on the determination result; The recording speed and image quality at ultra high speed and high quality at low speed and low quality By varying the pre-set time interval and a step of recording in the storage medium.

1 is a block diagram showing a digital video recording apparatus to be applied to the present invention,

2 is a flowchart illustrating a digital video recording process in the motion detection mode according to the present invention.

<Explanation of symbols for main parts of the drawings>

100: camera 102: decoder

104: codec 106: storage medium

108: central processing unit 110: key input unit

There may be a plurality of embodiments of the present invention, and a preferred embodiment will be described in detail below with reference to the accompanying drawings. Those skilled in the art will be able to better understand the objects, features and advantages of the present invention through this embodiment.

1 is a block diagram illustrating a digital image recording apparatus to be applied to the present invention, and FIG. 2 is a flowchart illustrating a process of recording digital image data in a motion detection mode according to the present invention.

As shown in FIG. 1, the digital video recording apparatus includes a decoder 102 for converting analog image data photographed and input from a signal-connected camera 100 into a digital signal, and a predetermined compression of the digital signal transmitted from the decoder 102. A codec 104 which compresses and encodes the total amount of data by compression and compression, a storage medium 106 that sequentially records the reduced output video data (in units of frames), and a video data recording process of the storage medium 106. The central processing unit 108 for controlling the overall control and the key input unit 110 for providing an input signal to the central processing unit 108 according to the setting of the recording mode (normal mode, motion detection mode, high speed mode, ultra-fast mode, etc.) .

Camera 100 is attached to a sensor that can detect the movement, the sensor generates a motion signal according to the movement is detected when the recording mode is the motion detection mode and transmits to the central processing unit 108.

The central processing unit 108 performs recording by an operation signal transmitted from a sensor attached to the camera 100. At this time, the recording speed and the image quality are changed according to time to decode the image data captured by the camera 100 into the decoder 102. And the codec 104 are recorded and stored in the storage medium 106.

In other words, the central processing unit 108 records the recording speed at a very high speed (30 frames per second) and image quality at a high quality (20 kilobytes per frame) for a preset time by the operation signal transmitted from the sensor, and then checks whether there is an operation signal from the sensor. The video data is recorded on the storage medium 106 by varying the recording speed and the image quality at a predetermined time interval when the operation signal is continuously determined.

The recording speed and image quality that are varied by the central processing unit 108 are high speed (20 frames per second) and high quality (20 KBytes per frame), medium speed (10 frames per second) and medium quality (10 KBytes per frame), low speed (5 frames per second) and The lower quality (5KByte per frame), the lowest speed (1st super short frame), and the lower quality (5KByte per frame) are varied.

An operation process of the digital video recording apparatus having the above configuration will be described below with reference to FIG. 2.

Before describing the operation process of the digital video recording device, it is assumed that the digital video recording device is recording in the normal mode in which the recording speed and image quality are low and low quality before the recording mode is set as the motion detection mode. do.

The central processing unit 108 receives a signal from the key input unit 110 while recording in the normal mode, and determines whether the received signal is a motion detection mode signal (S201).

The central processing unit 108 determines the signal input from the key input unit 110, and when the signal is not the motion detection mode setting signal, the decoder 102 and the image data captured by the camera 100 in the normal mode (low speed and low quality). The data is transmitted through the codec 104 and recorded in the storage medium 106 (S202).

The central processing unit 108 determines whether a motion signal is input from a sensor attached to the camera 100 to detect a motion when the signal detected by the key input unit 110 is a motion detection mode setting signal. When there is no operation signal from the sensor of the camera 100, the image data photographed by the camera 100 is not recorded on the storage medium 108, and the flow returns to step 203 to continuously determine whether the operation signal is generated (S203, S204).

As a result of the determination of step 203, when the operation signal is input from the sensor of the camera 100, the central processing unit 108 receives the image data captured by the camera 100 through the decoder 102 and the codec 104. The received image data is recorded in the storage medium 106 at a high speed and a high quality in the recording speed and the image quality for a predetermined time (for example, 5 minutes) (S205).

Subsequently, the central processing unit 108 determines whether an operation signal is input from a sensor attached to the camera 100 even after a preset time elapses. When the determination result indicates that the operation signal is not input from the sensor, the camera 100 The recording of the image data photographed at the step is stopped (S206 and S207).

When the operation signal is continuously input from the sensor as a result of the determination of step 206, the central processing unit 108 changes the recording speed and the image quality to ultra high speed, high quality, high speed and medium quality, medium speed and low quality, low speed and low quality at a predetermined time interval. The video data reduced and output by the codec 104 is recorded in the storage medium 106 (S208).

That is, when the operation signal is continuously input from the sensor, the central processing unit 110 performs the recording by changing the recording speed and image quality at intervals of 5 minutes, and then gradually changes to the normal mode (low speed, low quality), which is an existing setting mode. Let's do it.

As described above, when the recording mode is the motion detection mode, the image data shot by the camera is recorded in the storage medium for a predetermined time in the recording speed and the image quality by the operation signal transmitted from the sensor attached to the camera. When the operation signal is detected even after the preset time has elapsed, the recording speed and image quality are changed at a predetermined time interval from ultra high speed and high quality to low speed and low quality, and then recorded on the storage medium. In addition, the storage capacity of the storage medium can be efficiently managed.

Claims (1)

A method of recording a digital image in a motion detection mode using a camera attached to a sensor and generating a motion signal when a motion is detected, and a storage medium for recording image data photographed by the camera, Determining whether an operation signal is generated from a sensor of the camera; When the operation signal is generated, recording the image data photographed by the camera to the storage medium for a predetermined time at a recording speed and image quality at a high speed and a high quality; Determining whether an operation signal is generated from a sensor of the camera after the preset time elapses; Stopping recording of the image data photographed by the camera based on a result of the determination, or changing the recording speed and image quality at a predetermined time interval from ultra high speed and high quality to low speed and low quality to record on the storage medium. Digital video recording method in the motion detection mode, characterized in that the.