KR100207659B1 - File creating method of an image data in supervisory camera system and writing and regenerating method according to the same - Google Patents

Abstract

The present invention relates to a method for generating a file of image data and a recording and reproducing method according to the present invention. The method for generating a file of image data includes an image file for continuously forming a plurality of image frames, and the image file. It includes a header file having information such as the time when the video file corresponding to the generated, the input video channel, the presence or absence of an alarm and the location of the frame constituting the video file.

Therefore, as described above, in the surveillance camera system according to the present invention, the file generation method and the recording and reproducing method of the image data generate an image file in units of frames and form information on the generated image file. By recording, the desired video data can be searched in a short time so that the search time can be increased and the recording capacity can be minimized.

Description

File generation method of image data in surveillance camera system and recording and playback method accordingly

1 is a block diagram showing a computer system including an apparatus for recording and reproducing video data according to the present invention.

FIG. 2 is a detailed view of the image recording and reproducing processing section of FIG.

3 is a diagram showing the configuration of a recording file according to the present invention.

4 is a flowchart for explaining a method of recording video data according to the present invention.

5 is a flowchart for explaining a method of reproducing stored video data files according to the present invention.

The present invention relates to a surveillance camera system, and more particularly, to a method for generating a file of image data and a recording and reproducing method according to the surveillance camera system.

Surveillance camera systems typically store the captured picture on videotape to record a record of the surveillance space.

A video tape records an analog signal, and recording is generally performed by an intermittent recording type time lapse video tape recorder (time lapse VTR).

In addition, when using multiple video cameras, a frame switcher or a sequential switcher is used.

The frame switch refers to a device that randomly selects a screen transmitted from one video camera among a plurality of video cameras and displays it on one monitor screen, and a sequential switcher refers to a screen transmitted from a plurality of video cameras one by one. Refers to a device that can be selected sequentially and displayed on one monitor. For example, when using a frame switcher, inputs from a plurality of video cameras are input to the frame switcher and recorded by the signal VCR of the video camera selected by the frame switcher. At the time of reproduction, the ID pulse of the signal reproduced from the VCR can be searched to see the signal of a specific video camera on the frame switcher.

When storing a photographed image using a hard disk of a computer, the photographed image is digitally converted and recorded after compression is performed by using still image encoding in order to reduce the recording capacity. Therefore, there is an advantage that the recording capacity can be used efficiently compared with the case of recording analog signals.

As described above, in order to store the image data photographed on the hard disk of the computer, the image data to be stored must have a file format required by the computer system.

However, if the image data to be stored is stored as one file in units of one frame, it takes time to find the file during playback, and there is a problem in that the storage capacity increases according to storing thousands to tens of thousands of files.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a method for generating a video data file photographed in a surveillance space, a method for recording a generated file, and a method for reproducing a recorded video file. It is done.

The method for configuring an image data file in the surveillance camera system according to the present invention for achieving the above object is a video file for forming a plurality of video frames in a row in succession, and an image file corresponding to the video file is generated And a header file having information such as time, input video channel, presence or absence of an alarm, and position of a frame constituting the image file.

In addition, by converting an input video channel according to the present invention to achieve the above object, the analog signal input from the surveillance camera for taking an image is converted into a digital signal, and the converted digital signal is compressed in a predetermined frame unit. The recording method of the image data includes the steps of recording the generated image file; And forming and recording a header file from which information about a channel into which the recorded image file is input, presence or absence of an alarm, and recorded start and end times is obtained.

In addition, a method of decompressing image data recorded as a digital signal in a predetermined frame unit according to the present invention and reproducing the image data file obtained by converting the decompressed compressed signal into an analog signal according to the present invention achieves the above object. Reading a header file in which information about the file is recorded; And reading and playing a desired video data file from the read header file.

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

1 is a block diagram showing a computer system including an apparatus for recording and reproducing image data according to the present invention. The main body 118 of the computer includes a central processing unit (CPU) 102, a memory 104, and an interface circuit 106. The image recording and reproducing processing unit 116 is added to the existing computer main body which is constituted by the above.

In addition, the monitor 108, the printer 110, the hard disk driver (HDD) 112, and the DAT 114 are connected to the interface circuit 106 as in a normal PC.

The CPU 102 stores the compressed image data applied from the image recording and reproducing processing unit 116 to the HDD 112, reads the stored image data, and applies it to the image recording and reproducing processing unit 116.

The composite image signals CVS1 to CVSn generated from the plurality of video cameras C1 to Cn are applied to the image recording and reproducing processor 116, and the television receiver 120 is connected.

FIG. 2 is a detailed view of the image recording and reproducing processing unit 116 of FIG. 1, which shows an example of digitally converting a photographed screen and storing it in a hard disk of a computer.

In the apparatus shown in FIG. 2, the switching unit 200 selects a composite video signal of one channel among the composite video signals CVS1 to CVSn input from a plurality of surveillance video cameras in units of frames.

The analog digital converter 202 converts the analog composite video signal selected by the switching unit 10 into a digital composite video signal.

The frame capturing unit 204 captures image data digitally converted by the analog digital converting unit 202 by one frame for each preset frame interval.

The data compression unit 206 compresses the image data captured by the frame capture unit 204.

The address generator 208 generates an address of a frame stored and read in the HDD 112.

The memory 210 stores identification information of frames stored and read in the HDD 112. For example, the start and end addresses of each frame, the number of the corresponding camera, time information, and the presence or absence of an alarm are stored so that data necessary for playback and retrieval can be randomly extracted.

The data restoring unit 212 expands and restores image data read from the HDD 112.

The digital analog converter 214 converts the restored video data into an analog signal and applies it to the television receiver 118.

Next, an example of the operation will be described.

Referring to the recording operation of the wired image, the switching unit 200 switches the composite image data input from the plurality of video cameras in units of frames. At this time, the switching unit can be selected by the user.

The frame capture unit 204 captures the digital signal converted by the analog digital converter 202 in units of frames. At this time, the capturing interval is user selectable, and the N inputs are captured at equal multiples by capturing in multiples of N.

The signal captured by the frame capture section 204 is compressed by the data compression section 205, and the compressed signal is recorded on the HDD 112. At this time, the information of the recorded signal, that is, the start address of each frame, the end address of the frame, the channel information of the camera, the time information, the alarm information, and the like are stored in the memory so that only data necessary for playback and search can be extracted at random. .

Next, referring to the playback operation, the data stored in the HDD 112 is read, decompressed by the data recovery unit 212, output to the monitor 108, and converted into an analog signal by the digital analog conversion unit 214. The composite video signal is applied to the television receiver 120 to enable viewing on the television receiver.

In the case of retrieving necessary data, relevant information is read in each frame stored in the memory 120 to extract an address of a desired frame and the part is retrieved from the HDD 11.

3 is a diagram showing a configuration example of a recording file according to the present invention, wherein reference numeral 30 is an image file storing several frames as one file, and reference numeral 32 corresponds to a file in frame units of reference 30. It is a header file that records information about a frame, that is, time, presence or absence of a channel alarm, and frame position.

4 is a flowchart for explaining a method of recording video data according to the present invention.

Record the created video file. (Step 40)

Here, when recording is started, the analog channel input from the monitoring camera is converted into a digital signal while switching the input channel until the recording is stopped, and the converted digital signal is compressed and recorded on the HDD of the computer.

The header file is formed by acquiring information on the channel into which the recorded video file is input, the presence or absence of an alarm, and the recorded start and end time. (Step 42)

Here, the formed header file is stored in the memory.

Confirm that you want continuous recording and complete it. (Step 44)

5 is a flowchart for explaining a method of reproducing a stored video data file according to the present invention.

Read the recorded header file. (50 levels)

Here, information on the image data acquired at the time of recording is read to search for necessary information.

The desired video data file is read from the read header file. (Step 52)

Complete by checking if you want a continuous read. (54 steps)

As described above, in the surveillance camera system according to the present invention, a method for generating a file of image data and a recording and reproducing method according to the present invention generate an image file in units of a plurality of frames, and record the image file to form information on the generated image file. Therefore, it is possible to speed up the search time and minimize the recording capacity by searching for desired image data in a short time.

Claims (3)

A method of constructing an image data file in a surveillance camera system, the method comprising: an image file for forming a plurality of image frames into a single file in succession, a time at which an image file corresponding to the image file is generated, an input video channel, an alarm; And a header file having information such as the presence or absence of a frame and the position of a frame constituting the image file. A method of recording video data obtained by converting an analog signal input from a surveillance camera photographing an image while switching an input video channel into a digital signal, and compressing the converted digital signal in a predetermined frame unit. Collecting and recording the generated image file into one file; And forming and recording a header file which obtains information on a channel into which the recorded image file is input, presence of an alarm, and recorded start and end times. A method of decompressing video data recorded as a digital signal in a predetermined frame unit and playing back a video data file obtained by converting the decompressed compressed signal into an analog signal, the method comprising: reading a header file in which information about the video file is recorded; Doing; And reading out and reproducing a desired video data file from the read header file.