KR100449545B1 - Digital video recorder system and method for thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video recording apparatus and method, and more particularly to input means for setting a VBI data storage area table identical to VBI data superimposed on a first analog composite video signal, a hard disk driver for storing video data, and And a memory means for storing a VBI data storage area table, an image input unit for inputting, encoding, compressing, and outputting a first analog composite video signal, and outputting the digital video data stream, and expanding and decoding the reproduced digital video data stream. A video output section for outputting a composite video signal, a VBI decoder for separating and decoding the VBI data from the first analog composite video signal with reference to the VBI data storage area table stored in the memory means, and a VBI data storage area table stored in the memory means Image identification information of the played video file with reference to A VBI generator for generating VBI data, and a VBI decoder providing a set VBI data storage table at the time of writing to the VBI decoder, and generating a file of a compressed digital video data stream in response to the VBI information decoded from the VBI decoder. A second analog video signal restored by providing a set VBI data storage area table to the VBI generator, and providing the VBI data generated from the VBI generator and the reproduced digital video data stream to the video output unit during playback. And a processor for controlling the superimposed video signals to be output.

Description

Digital video recorder and method {DIGITAL VIDEO RECORDER SYSTEM AND METHOD FOR THEREOF}

The present invention relates to a digital video recording apparatus and method, and more particularly, to digital video recording, which can improve compatibility with VBI (Vertical Blanking Information) data when a video signal storage of an analog video surveillance system is converted to a digital method. It relates to a device (DVR: DIGITAL VIDEO RECORDER) and a method.

The video surveillance system (VSS) was initially recorded by connecting one VCR to one camera. However, in normal VCRs, it is not possible to record still images and to record movies, so recording time per tape is very short, making it difficult to record for long periods of time. Improvements were made to display the screen sequentially through a device, a camera switcher or a multiplexer. However, this method also shows only the screens in order, and thus has a disadvantage of not being able to monitor overall.

Therefore, in order to compensate for this, as shown in FIG. 1, the four-division equipment 12 has been introduced to improve the system for simultaneously monitoring four cameras 10 by dividing the screen of one monitor 16 into four equal parts.

In addition, a TIME LAPSE VCR 14 has been developed for economical management such as reducing the number of tapes. Time Lapse VCR 14 is a method of extending the recording time of the tape by recording the screen as if taking a picture as a still picture instead of a normal video.

The analog video surveillance system has a slow screen switching time, and the image quality is degraded due to the deterioration of the magnetic material of the tape and the tape sagging due to the repeated use of the tape. In addition, the time-lapse VCR causes the system cost and the labor cost of the personnel who operate it because the price of the equipment for the low-speed recording and control configuration for the long-term storage on the video tape is very expensive compared to the general video tape recorder.

Recently, a digital video surveillance system for digitally storing and reproducing surveillance video data on a hard disk has been introduced to improve the problems of the analog system.

As shown in FIG. 2, the digital video surveillance system inputs from a video camera to a specific line of vertical blanking interval (VBI: VERTICAL BLANKING INFORMATION) of analog video signals picked up from the plurality of cameras 20 by the switching means 22. The time stamp and the camera channel data, which are obtained time information, are inserted and channel multiplexed to output a surveillance video signal. In addition, the signal reproduced from the DVR controller 24 may be multiplexed and output as a surveillance video signal. The output surveillance video signal is displayed on the monitor 26 as one screen, four divided screens or sixteen divided screens.

The digital image recording (DVR) controller 24 receives a video signal from a switching means 22, that is, a camera switcher or a multiplexer in real time, converts the digital video data into a digital video data, and compresses and stores the converted digital video data. A data file is generated and the generated file is stored in the hard disk 28. At the time of reproduction, a file is read from the hard disk 28, the read data is stretched to restore digital image data, the restored data is converted into an analog signal, and provided to the monitor 26 through the multiplexer 22 for display on the screen. .

Therefore, the digital video recording controller 24 stores the surveillance video on the hard disk instead of the tape, so there is no fear of deterioration of the quality even if repeated playback, so that a clean screen can be always displayed and random search is possible to quickly find a desired scene at high speed. can see.

However, this method is difficult to restore the original data during playback because part of the data is lost in the process of compressing the data to utilize the storage space. Although video and audio data are compressed to the extent that some data is lost, they cannot be visually or audibly felt at the time of restoration.However, VBI data may not be restored if some data is lost. Restoration will be impossible.

If the VBI data is not restored, the display itself cannot be displayed on the monitor through the multiplexer, or the phase relationship of the video signal is blurred even if displayed on the monitor, so that the screen state is poor or additional functions through the VBI data are not properly operated.

Therefore, the conventional digital video recording apparatus generates VBI data at the time of restoration with the same VBI data as the VBI data used by the switching means, and outputs the restored video signal.

However, the VBI data generated by the switching means is not compatible because each video surveillance equipment manufacturer uses a unique data format.

Therefore, in the case of replacing only the video recording device digitally from the existing analog video surveillance device, it is impossible to replace the device unless it is the same company's equipment due to the issue of the VBI data.

However, if a user wants to replace the switching equipment with a set, consumers have to pay a lot of replacement costs, so the market for digital video recording devices is not formed in the video surveillance market.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital video recording apparatus and method having excellent compatibility since it is possible to designate a VBI data storage area in order to solve the problems of the prior art.

Another object of the present invention is to provide a digital image recording apparatus and method which solves the problems caused by the operating system and improves the compatability by managing files in a file table manner without depending on the operating system.

1 is a view showing the configuration of a conventional analog video surveillance system.

2 is a view showing the configuration of a video surveillance system including a conventional digital video recording apparatus.

3 is a block diagram of a preferred embodiment of a digital video recording apparatus according to the present invention.

4 is a diagram for explaining a composite video signal.

5 is a block diagram of a content table according to the present invention;

6 is a block diagram of file information according to the present invention;

7 is a block diagram of a file according to the present invention.

8 is a flowchart for explaining a digital image recording method according to the present invention;

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

100: digital video recording device 110: video input unit

111: ADC 112: Encoder

113: Compressor 114: VBI Decoder

115: synchronous detector 120: system control unit

122: microprocessor 124: ROM

126: SDRAM 130: video output unit

131: expander 132: decoder

133: DAC 134: VBI Generator

135: synchronization generator 136: multiplexer

140: file management unit 150: HDD interface unit

160: hard disk driver 170: PC interface unit

In order to achieve the above object of the present invention, the digital image recording apparatus of the present invention comprises input means for setting the same VBI data storage area table as the VBI data superimposed on the first analog composite video signal, and for storing the image data. A hard disk driver, a memory means for storing a VBI data storage area table, an encoder for inputting, encoding and compressing a first analog composite video signal and outputting the digital video data stream, and extending and decoding the reproduced digital video data stream. A decoder for outputting a second analog composite video signal, a VBI decoder for separating and decoding VBI data from the first analog composite video signal with reference to a VBI data storage area table stored in the memory means, and a VBI stored in the memory means Images played by referring to the data storage table A VBI generator for generating VBI data with one piece of image identification information, and providing the set VBI data storage area table to the VBI decoder at the time of recording, and in response to the VBI information decoded from the VBI decoder, the encoded digital image. A file of a data stream is generated and stored in the hard disk drive, and during playback, the set VBI data storage area table is provided to the VBI generator, the VBI data generated from the VBI generator, and the reproduced digital video data stream. And a processor for controlling the output of the superimposed video signal by superimposing the restored second analog video signal to the decoder.

In the present invention, a plurality of VBI data storage areas tables are provided in advance in the memory means, and one of the plurality of VBI data storage areas is selected by the input means. The memory means constitutes a read-only semiconductor memory (ROM) in which a plurality of VBI data storage area tables are stored.

In the present invention, the VBI data storage area table is also implanted into the memory means from the outside by the input means. The input means is a personal computer connected by a serial input / output method such as 1394 or RS232C, and the memory means comprises a nonvolatile memory such as a flash memory or an EEPROM.

In the present invention, the processor stores the file and registers the stored file in the content table to manage the file.

The method of the present invention comprises the steps of setting the VBI data in response to an external input upon system initialization, encoding the composite video signal into digital compressed data during recording, and decoding the VBI data signal based on the set VBI data storage area table. And generating the compressed data and the decoded VBI information into a file, registering the generated file in the TOC, recording the compressed file on the hard disk, expanding the compressed data read from the hard disk, and converting the expanded digital image data into an analog image. Converting the signal into a signal, generating a VBI data signal based on the reproduced VBI information, superimposing the generated VBI data signal and an analog image signal, and outputting the reproduced composite video signal; and repeating the above operations. It is characterized by.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the present invention through an embodiment of the present invention.

Referring to FIG. 3, an embodiment of the digital image recording apparatus 100 according to the present invention includes an image input unit 110, a system control unit 120, an image output unit 130, a file management unit 140, and an HDD interface unit. 250, a hard disk driver 160, and a PC interface unit 170.

Image input unit 110 is a conventional analog switching means for generating a composite video signal (CVS) by superimposing the VBI data signal to the video signals picked up from a plurality of cameras and the video signal corresponding to each camera (not shown) ) And input the composite video signal CVS_IN.

Referring to FIG. 4, in the NTSC video signal having 525 lines, the composite video signal CVS_IN is a vertical return period (VBI) consisting of 21 horizontal lines in the odd field and images from the 22nd to 262 lines. It has a display section. Each horizontal line of the display section carries a video signal, and the vertical return period VBI is divided into three equalizing pulse periods (EQI) consisting of nine lines and an additional information period (AII) of eleven lines.

The additional information section AII carries various additional data signals such as voice multiple index information, KBPS (easy weak recording information), and color test pattern information. Therefore, in a video surveillance system such as CCTV, video index information is loaded on an arbitrary line of the additional information section (AII) and used for searching during playback.

The video index information includes camera number information, that is, channel information, date information, alarm information, and motion channel information.

Such video index information is used by a data storage area differently for each video surveillance system manufacturer.

The image input unit 110 includes an ADC 111, an encoder 112, a compressor 113, a VBI decoder 114, and a synchronous detector 115.

The input composite image signal CVS_IN is converted into digital image data in real time by the ADC 11, and the digital image data is processed by the encoder 112 for data such as storage locating, scaling, motion detection, and the like. ) Is compressed by a compression algorithm such as MPEG, DV, Wevelet, etc. and is provided to the system controller 120 in the form of a compressed data stream.

The VBI decoder 114 separates the VBI data from the composite video signal CVS_IN, decodes the separated VBI data, and provides the decoded VBI data to the system controller 120.

The sync detector 115 separates the VBI data from the composite video signal CVS_IN, decodes the separated VBI data, and provides the decoded VBI data to the system controller 120.

The system controller 120 includes a microprocessor 122, an SDRAM 126, a ROM 124, and peripheral logic circuits not shown. The microprocessor 122 controls the entire system, records video signals on the hard disk in response to external commands, retrieves the recorded video signals, and displays them on the monitor. The SDRAM 126 is used as a data storage and buffer memory when processing image data, a control program is implanted in the ROM 124, and control-related data is implanted. In particular, at least one storage area table for decoding and generating VBI data signals is implanted in the present invention. VBI data storage tables from multiple companies are ported. The ROM 124 is composed of a nonvolatile memory such as EEPROM or flash memory, and the VBI data storage area table can be externally ported through serial data communication such as RS232C.

The image output unit 130 includes an expander 131, a decoder 132, a DAC 134, a VBI generator 134, a synchronization generator 135, and an output multiplexer 136.

The reproduction file data provided from the system controller 120 is decompressed in real time in the expander 131 to be decompressed to the original digital image data, and the decompressed digital image data is reformatted, scaled, zoomed, OSD, Data processing, such as a border processing, is restored to an analog video signal in the DAC 133 and provided to the output multiplexer 136.

The VBI generator 134 generates a VBI data signal from the provided VBI information and provides it to the output multiplexer 136.

The synchronization generator 135 generates a composite synchronization signal including vertical and horizontal synchronization and provides the output to the output multiplexer 136.

The output multiplexer 136 superimposes the video signal, the VBI data signal, and the composite synchronous signal by the timing control of the system controller 130 and outputs the composite video signal CVS_OUT to a monitor (not shown).

The file management unit 140 generates the image data provided from the system control unit 120 as a file, stores the image data in the hard disk driver 160 through the HDD interface unit 250, and stores the image data requested for search by TOC (TABLE OF CONTENTS). The searched image data is read from the hard disk driver 160 and the playback file data is provided to the system controller 120.

The file manager 140 may perform data communication with a personal computer (not shown) through the PC interface 170.

PC interface unit 170 is a two-channel 1394 bus system, one channel is connected to the file management unit, the other one channel is connected to the microprocessor of the system control unit.

The file manager 140 may be configured as, for example, an SSP-100 (trade name) processor of nNovia of USA. The SSP-100 processor does not use a PC operating system (OS), and can access MPEG streams and DV signals for digital video broadcasting, or parallel or serial Wevelet signals.

The SSP-100 manages file data by the TOC shown in FIG. 5 and the file information shown in FIG.

Referring to Fig. 5, the TOC includes the total number of bytes / size / number of registrations / file index information (F # 1 to F # n) and the like. Each file index information is composed of file ID / file type / frame rate (NTSC 30, PAL 25) / file size (hours and seconds frame) / modification date (year, month, date, minute and second) / file name bytes / file name.

Each file stored on your hard disk consists of a header and data.

Referring to FIG. 6, the file information of the file header includes the total number of bytes / secret level / permission / program type and ID / output storage area / pointer (hours / seconds frame) / file creation date (year / month / day / minute / second) / mark block size. / Include mark information (mark in / mark out). Therefore, the VBI data stores camera channel information, alarm information, motion information, etc. corresponding to the program type and ID, and stores the video signal pickup date in the file generation date.

Referring to FIG. 7, each file 200 includes a header 210 and a data 220. The data unit 220 is composed of a plurality of data blocks 222, and each data block has a start address (mark in) and an end address (mark out).

One embodiment of the present invention configured as described above provides very excellent compatibility when a recording apparatus of an existing analog video surveillance apparatus is to be replaced from an analog video tape method to a digital recording method.

The present invention is connected between the existing switching means and the monitor, and the manufacturer of the switching means is examined to decrypt the VBI data storage area of the corresponding company.

The system controller 120 checks the VBI data setting at system initialization (S10).

If the VBI data is not set, the setting data is input to perform the VBI data setting operation (S12). If the setting data has been transplanted to the ROM 124 in advance, a selection command for selecting one of them is input. If the setting data is not ported in advance, the setting data is input from the outside and ported to the EEPROM or the flash memory.

Since the VBI data storage table can be selected or ported as described above, even if the manufacturer of the switching means is different, it is possible to improve.

When the setting of the VBI data is completed, the microprocessor 122 provides the set VBI data storage area information to the VBI decoder 114 and the VBI generator to complete the setting (S14).

If the system is set in the step S10, the microprocessor 122 checks whether the recording mode or playback mode (S16).

In the recording mode, when a motion is detected to record an important video signal, the video input unit 110 inputs a composite video signal (S18). Subsequently, the image input unit 110 converts the composite image signal into digital image data, stores and scales the converted image data, and then compresses the image data by using a data compression algorithm (S20). In addition, in response to the set VBI data storage area, the VBI data signal is separated from the composite video signal, decoded, and the decoded VBI data is provided to the system controller 120 (S22).

The system controller 120 provides the compressed data and the VBI decryption information to the file manager 140. The file management unit 140 generates a file based on the provided VBI decryption information, registers the generated file in the TOC (S24), and provides the HDD 160 to record it (S26).

When the playback mode, that is, the file search command or the playback command is received by the system controller 120 in step S16, the system controller 120 transmits the command to the file manager 140. The file manager 140 decodes the playback command and searches for the file with reference to the TOC. That is, a file having the same index is searched by an index such as a file ID, a file type, a file name, or a modification date created in the TOC, the retrieved file is read from the HDD 160, and the SDRAM 126 of the system controller 120 is read. Save it.

The system controller 120 separates the file header stored in the SDRAM (S32) and provides VBI data information among the header information to the VBI generator 134 to generate a VBI data signal (S34). In addition, file data is provided to the image output unit 130 to extend the compressed data into the original digital image data, and to process the expanded image data such as zooming, scaling, OSD and border insertion, and then outputting the analog image signal. do.

The synchronization generator generates a composite synchronization signal including a burst synchronizer and vertical and horizontal sync signals in response to timing control. The composite synchronization signal, the VBI data signal, and the video signal are multiplexed by the timing control of the system controller 120 and output to the monitor as the composite video signal CVS_OUT (S36).

When such a series of processes is performed, it is checked whether the system is terminated (S38). If the process is terminated, the system is terminated, and if the process is not terminated, the system returns to step S10 to repeat the above processes.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

As described above, in the present invention, the VBI data storage area can be set to enable compatibility with products of other companies, thereby enabling digital video recording at a low cost in the existing analog video surveillance apparatus. Therefore, various problems in the video surveillance environment of the analog video tape system can be easily solved by digital video recording.

In addition, it is easy and simple to design the system by hardware file management without using a computer operating system, and it is possible to operate the file search and additional functions effectively.

Claims (14)

Input means for setting a storage area table of the same VBI data as the VBI data superimposed on the first analog composite video signal; A hard disk driver for storing image data; Memory means for storing a VBI data storage area table; An image input unit for inputting, encoding, compressing, and outputting a first analog composite image signal as a digital image data stream; An image output unit which expands and decodes the reproduced digital image data stream and outputs a second analog composite image signal; A VBI decoder for separating and decoding VBI data from the first analog composite video signal by referring to a VBI data storage area table stored in the memory means; A VBI generator for generating VBI data using image identification information of a reproduced video file by referring to a VBI data storage area table stored in the memory means; During recording, the set VBI data storage area table is provided to the VBI decoder, and a file of the compressed digital video data stream is generated and stored in the hard disk drive in response to the VBI information decoded from the VBI decoder. During playback, the set VBI data storage area table is provided to the VBI generator, the VBI data generated from the VBI generator, and the reproduced digital video data stream are provided to the decoder to recover the second analog video signal. And a processor for controlling the superimposed video signals to be superimposed. The digital video recording apparatus according to claim 1, wherein a plurality of VBI data storage area tables are provided in advance in said memory means, and one of the plurality of VBI data storage areas is selected by said input means. 3. The digital video recording apparatus according to claim 2, wherein the memory means is a read-only semiconductor memory (ROM) in which a plurality of VBI data storage area tables are stored. The digital video recording apparatus according to claim 1, wherein the VBI data storage area table is implanted into the memory means from the outside by the input means. 4. The digital video recording apparatus according to claim 3, wherein the input means is a personal computer connected by a serial input / output method such as RS232C, and the memory means is a nonvolatile memory such as a flash memory or an EEPROM. The digital image recording apparatus according to claim 1, wherein the processor manages the file by storing the file and registering the stored file in a content table. Input means for setting a storage area table of the same VBI data as the VBI data; An image input unit which inputs, encodes, compresses, and outputs a first composite image signal to a digital image data stream, and decodes VBI data with reference to the set VBI data storage area and outputs VBI information; Outputting a second composite video signal by overlapping the reconstructed video signal by decompressing and decoding the reproduced digital video data stream and the VBI data signal generated based on the reproduced VBI information with reference to the set VBI data storage area. Image output unit; The first composite video signal provided through the video input unit is generated based on the decoded VBI information, the file is registered in the TOC, the generated file is stored in a hard disk drive, and the TOC is returned in response to a search command. A file management unit for searching for a file and reading and providing the retrieved file data from a hard disk driver; And And a system control unit which sets the VBI data storage area by an external input at the beginning of the system and provides the data management unit with data provided from the video input unit at the time of recording, and provides the image output unit with data provided from the file management unit at the time of playback. Digital video recorder. The method of claim 7, wherein the image input unit An analog-digital converter for converting the first composite video signal into digital video data; An encoder for storing region scaling and scaling of the digital image data; A compression compressor for compressing the encoded data; And a VBI decoder for separating and decoding the VBI data signal from the first composite video signal. The method of claim 7, wherein the image output unit An expander which expands the reproduced compressed data; A decoder configured to zoom, OSD, or border the decompressed image data; A digital analog converter for converting the video data into an analog video signal; A VBI generator for generating a VBI data signal based on the reproduced VBI information; And And a multiplexer for superimposing the video signal and the VBI data signal and outputting the video signal as the second composite video signal. The system of claim 7, wherein the system control unit SDRAM for temporarily storing data and arithmetic processing; A ROM storing a plurality of VBI data storage table; The system is set to a corresponding VBI data storage area in response to a setting signal at the initial stage of the system, and the image data obtained from the first composite image signal and the decoded VBI information are transmitted to the file management unit, and the reproduced image data provided from the file management unit. And a microprocessor for providing reproduction VBI information to the image output unit. Setting a VBI data storage area in response to external input at system initialization; Encode the composite video signal into digital compressed data during recording, decode the VBI data signal based on the set VBI data storage area, generate the compressed data and decoded VBI information into a file, and register the generated file in the TOC. Writing to the hard disk; Decompressing the compressed data read from the hard disk, converting the decompressed digital video data into an analog video signal, generating a VBI data signal based on the reproduced VBI information, and multiplexing the generated VBI data signal and the analog video signal. Outputting a reproduced composite video signal; And And repeating the above operations. 12. The digital video recording method according to claim 11, wherein the TOC includes file ID / file type / file size / modification date / file name as file index information. 12. The digital video recording method according to claim 11, wherein the file comprises a file header part and a file data part. 14. The file header unit of claim 13, wherein the file header unit has a secret class / permission / program type and ID / output storage area / pointer (hour and second frame) / file creation date (year, month, minute, and second) / mark block size / mark information (mark in / Mark out).