KR100356007B1 - Apparatus and method for recording and reproducing video during long time using universal video tape recorder - Google Patents

Abstract

PURPOSE: An apparatus and a method for recording/reproducing video signals using a general video tape recorder are provided to store analog video signals for a long time using a general video tape recorder and to cope with fault of a hard disc drive by preparing a plurality of hard disc drives. CONSTITUTION: An apparatus for recording/reproducing video signals for a long time includes a digital storage unit(48), a digital recording/reproduction controller, and a video tape recorder(46). The digital storage unit is used for recording data in a digital recording medium and reproducing the data from the recording medium. The digital recording/reproduction controller converts an analog video signal into a digital video signal, samples the digital video signal, records the sampled video data in the digital storage unit, reads a predetermined amount of video data when video data more than a predetermined quantity is recorded in the storage unit, and converts the read data into an analog video signal. The video tape recorder records the analog video signal on a magnetic tape and reproduces the video signal recorded on the magnetic tape.

Description

Apparatus and method for long time video recording and playback using general video tape recorder {APPARATUS AND METHOD FOR RECORDING AND REPRODUCING VIDEO DURING LONG TIME USING UNIVERSAL VIDEO TAPE RECORDER}

The present invention relates to a long time video recording and reproducing apparatus and method using a general video tape recorder, and particularly to a long time video signal using a hard disk driver and a general video tape recorder in a video surveillance system, and to record the recorded video in high quality, high speed The present invention relates to a video recording and reproducing apparatus and a method which can be searched.

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. It is improved by showing the screen sequentially through the equipment. 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 to reduce 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, time-lapse VCRs cause a high system cost because of the high cost of the mechanism and control configuration for low-speed recording for long-term storage on videotape compared to conventional videotape recorders.

In recent years, a digital video surveillance system using a personal computer has been introduced to improve the problems of the analog system.

As shown in FIG. 2, the digital video surveillance system converts a video signal provided from the plurality of cameras 20 through the switching means 22 into a digital video signal to perform screen processing and screen switching on the personal computer 24. It has the advantage of providing various modes of surveillance environment and providing clear picture quality with excellent screen capture function. In addition, by storing the surveillance video on the hard disk of the personal computer 24, not tape, there is no fear of deterioration of image quality even after 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. have.

However, hard disk drivers have to build a backup system because the system itself is often unstable or down. In addition, considering the price of the recording medium to the storage capacity, the value of the HDD is still higher than that of the video tape.

An object of the present invention is to digitally sample a surveillance video in a video surveillance system, to store the sampled surveillance video data on a hard disk, and to store the stored surveillance video data using a general video tape recorder. The present invention provides a video recording and reproducing apparatus and method capable of recording for a long time on a video tape and retrieving recorded video at high quality and high speed by recording an analog video signal.

Another object of the present invention is to provide a video surveillance system capable of storing analog video signals for a long time using a general video tape recorder.

Still another object of the present invention is to provide a video surveillance system having a plurality of hard disk drivers to prepare for a failure of the hard disk driver.

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

2 is a diagram showing the configuration of a conventional digital video surveillance system.

Figure 3 is a view showing the configuration of a video surveillance system capable of long time video recording and playback using a general video cassette tape recorder according to the present invention.

FIG. 4 is a block diagram showing the configuration of a preferred embodiment of the digital recording and reproducing control apparatus of FIG.

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

30: surveillance camera 32: switching means

34, 44: analog-to-digital converting means 36: digital recording / reproducing means

38, 42; Digital analog conversion means 40: monitor

46: regular VCR 48, 49: hard disk driver

50: system 52: alarm means

216; Image compression means 222: Video extension means

218, 220: interface means 226: index encoder

In order to achieve the above object of the present invention, an image recording and reproducing apparatus of the present invention comprises digital storage means for recording and reproducing data on a digital recording medium, converts an analog image signal into a digital image signal in real time, and converts the image. Sampling the digital video signal to a predetermined number of screens per second, recording the sampled screen data into the digital storage means, and reading a predetermined amount of screen data when the predetermined amount of screen data is recorded in the digital storage means, and reading the read screen data. Digital recording / reproduction control means for converting the analog video signal into an analog video signal, and a general video tape recorder for recording the converted analog video signal on a magnetic tape and reproducing the video signal recorded on the magnetic tape.

The digital storage means may be configured as a large capacity hard disk driver, an optical disk driver or a semiconductor memory module.

Preferably, the digital recording / reproducing control means is composed of one chip composed of an ASIC. The digital recording / playback control means includes analog conversion means for converting an analog video signal into a digital video signal in real time, a memory means for storing the converted digital video signal on a screen basis, and a digital video signal stored in the memory means per second. Image compression means for sampling a predetermined number of screens, compressing the sampled screen data, and providing the compressed data through the image compression means to the hard disk driver, and reading the stored compressed data if the data stored in the hard disk driver is a predetermined amount or more. Outgoing interface means, video expansion means for decompressing the compressed data read out through the interface means, an index encoder for adding index information to the decompressed data, and digital for converting the digital video data with the index into an analog video signal. With analogue conversion means .

The recording method of the present invention comprises the steps of converting an analog video signal provided from a surveillance camera into a digital video signal in real time, sampling the digital video signal at a predetermined number of screens per second, and converting the sampled screen data into digital storage means. Storing a predetermined amount of screen data when the predetermined amount of screen data is stored in the digital storage means; converting the read screen data into an analog video signal; and converting the converted analog video signal into a general video tape. And recording on a video tape by a recorder.

Here, it is preferable to compress the screen data before storing the screen data in the digital storage means, read out from the digital storage means, and then expand the compressed data. In addition, adding index information to the read screen data before conversion into an analog video signal facilitates retrieval during reproduction.

The reproduction method of the present invention comprises the steps of: reproducing a video signal from a video tape recorded by the above-described recording method, converting the reproduced analog video signal into a digital video signal in real time, and index information added to the digital video signal. Extracting the digital image signal, storing the digital image signal in the digital storage means, reading the digital image signal stored in the digital storage means in response to a read command by the extracted index information, and reading the read digital image. Processing the signal into a screen display video signal, converting the processed screen display video signal into an analog video signal, and displaying the converted analog video signal on a monitor.

The video surveillance system of the present invention comprises a plurality of surveillance cameras, a general video tape recorder, a monitor, a hard disk drive, and first and second analog to digital conversion means for converting an analog video signal into a digital video signal. First and second digital analog conversion means for converting a digital video signal into an analog video signal, and switching for switching the provided analog video signal from a plurality of surveillance cameras to the first analog digital conversion means. Means for combining the n digital video signals provided through the first and second analog-to-digital converting means with the screen data read from the hard disk driver, and performing n-split screening and processing the n-split screen. And converting the first or second analog-digital converting means. Sampling the digital video signal provided through a predetermined number of screens per second, storing the sampled screen data in the hard disk drive, reading the screen data stored in the hard disk driver by a certain amount, and reading the predetermined amount of screen data into the second digital signal. Digital video recording and reproducing means provided to the analog conversion means, and in the recording mode, by switching the video signal provided from the surveillance camera, sampling and storing a predetermined number of screens per second on the hard disk through the digital video recording and reproducing means, The screen data is read and recorded on the video tape of the general video tape recorder for a long time, and in the playback mode, the video signal reproduced from the video tape is stored in the hard disk, and the video signal stored in the hard disk is read out to monitor the video data. It characterized in that it comprises a system control means for controlling so that display.

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

Figure 3 shows the configuration of a video surveillance system capable of long time video recording and playback using a general video cassette tape recorder according to the present invention. The video surveillance system includes a plurality of surveillance cameras 30, a switching means 32, a first analog-digital converting means 34, a digital recording / reproducing means 36, a first digital analog converting means 38, a monitor ( 40, a second analog to digital conversion means 42, a second digital to analog conversion means 44, a general video tape recorder 46, a plurality of hard disk drivers 48 and 49, and a system control means 50. do.

FIG. 4 shows the configuration of a preferred embodiment of the digital recording and reproducing control apparatus of FIG. In Fig. 4, the first analog-to-digital converting means 34 includes four video decoders 34a for digitally converting four-channel video signals for four-division display and a video decoder 34b for digitally converting video signals for recording. ). Each video decoder converts an analog video signal into a digital video signal, and the converted video signal is separated into a luminance signal (Y) and a color difference signal (U, V).

The digital record / playback control means 36 is composed of an ASIC one chip. The digital recording and reproducing control means 36 is largely divided into the display image processing unit 100, the recording and reproducing image processing unit 200, and the system interface unit 300.

The display image processing unit 100 is for generating and outputting a 4-split display screen, and inputting four digital image signals to decode the luminance signal and the color signal in a CCIR656 format that processes 4: 2: 2 in a ratio of 102. A scaler 104 for adjusting the horizontal and vertical sizes of the decoded image data to a quad screen size, an input buffer 106, an SDRAM controller 108 for writing and reading image data to and from the SDRAM 402, and an output buffer. 110, a zoom processor 112, an OSD processor 114, and an encoder 116. The scaler 104 is provided with image data read out from the hard disk driver 48.

The recording and reproducing image processor 200 stores a video signal provided from the surveillance camera in a hard disk drive and reads the stored data to provide it to the VCR, or processes the playback screen to display the image reproduced from the VCR on a monitor. The recording and playback image processing unit 200 is a decoder 202 for decoding the image data provided from the video decoder 34b into the CCIR656 format, an input buffer 204, and a decoder 206 for decoding the playback image data into the CCIR656 format. An index encoder 208 for extracting and decoding index information, an input buffer 210, an SDRAM controller 212 for outputting and reading image data into the SDRAM 404, an output buffer 214, and an image compression means ( 216, an interface unit including a hard disk formatter 218 and a hard disk deformatter 220, an image expansion means 222, a multiplexer 224, an index decoder 226, a CCIR656 encoder 228, and the like. do.

The system interface unit 300 includes a detector 302, a microcomputer interface unit 50, and a synchronization generator 306.

Effects of the embodiment of the present invention configured as described above are as follows.

The surveillance video signal captured from the sixteen surveillance cameras 30 is provided to the first analog-to-digital converter 34 through the switching means 32. The switching means 32 switch the desired surveillance cameras 30 by switching control of the system control means 50.

The digitally converted digital image signals of the plurality of CCIR656 formats are each scaled down to a 4-split size and stored in the SDRAM 402 through the input buffer 106. The 4-segmented surveillance video data stored in the SDRAM is read through the output buffer 110, ZOOM and OSD processed, and then CCIR656 reverse-formatted and transmitted to the first digital-to-analog converter 38. The analog-switched four-segment surveillance video signal is applied to the monitor 40 and displayed as a four-segment screen on the screen.

As such, when a recording event occurs in the monitored four-split screen, the system control means 50 issues a switching control command to the switching means 32 to control the video signal of the surveillance camera to be input to the video decoder 34b. do. The video signal input to the video decoder 34b is digitally converted and converted into CCIR656 format and stored in the SDRAM 404 through the input buffer 204 in real time.

The SDRAM controller 212 reads only five pieces of screen data out of sixty-second pictures by the read timing provided from the system control means 50. Therefore, only 5 pieces of screen data are sampled out of the 60 pieces of screen data per second, which is compressed to 1/12 on the time axis.

The screen data read out through the output buffer 214 is transmitted to the image compression means 216 and compressed to approximately 1/10. In other words, approximately 350k byte of image data is compressed to 35k byte of image data for each field. The compressed video data is formatted in HDD format and stored in the hard disk driver 48.

Image data stored in the hard disk driver 48 may be classified and stored by camera number, time zone, or event, or may be stored in chronological order. This storage classification facilitates retrieval during retrieval.

The image data stored in the hard disk driver 48 is read in a predetermined amount unit, for example, file size, time unit, and the like, deformatted by the HDD deformatter 220, decompressed by the image expansion means 222, and then decompressed. The image data is restored.

The reconstructed image data is provided to the scaler 104 for display on the monitor 38 or to the second digital analog converter 42 via the multiplexer 224, the index encoder 226, and the CCIR656 encoder for recording. The index encoder 226 is inserted in the vertical blanking section as information for indexing the position of the video signal on the video tape.

The analog video signal converted through the second digital-to-analog converter 42 is provided to the general VCR 46 and recorded on a video tape. That is, the recorded video signal is recorded as a still picture in field units. Therefore, the recording of still images, which can be performed only in a time-lapse VCR, is also possible in a general VCR, so that it is possible to record video information of the same or longer time period compared to the time-lapse VCR.

When the recorded video tape is reproduced in the general VCR 46, the reproduced video signal is converted into a digital video signal by the second analog-to-digital converter 44, so that the CCIR656 decoder 206, the index decoder 208, and the input buffer ( The data is written to the SDRAM 404 via 210. The written data is read in a first-in, first-out manner and stored in the hard disk driver 48 via the output buffer 214 via the image compression means 216 and the HDD formatter 218.

The corresponding reproduced image data stored in the hard disk driver 48 is read with reference to the decoded index in response to the search command provided from the system control means 50. The read out reproduced image data is provided to the scaler 104 via the HDD deformatter 220 and the image expansion means 222. The reproduced image data provided to the scaler is synthesized with other image data and displayed on the monitor 40.

Therefore, instead of viewing the image reproduced from the videotape as it is, it is once re-saved as digital image data in the hard disk driver 48, and then the re-stored image data is retrieved and displayed on the monitor. Therefore, high-speed search and random access are possible on the hard disk, and the image quality is clear and clear because the digital image data is analog-converted and displayed on the monitor 40.

The system control means 50 checks whether or not the hard disk driver 48 is broken, and when the hard disk driver 48 is broken, the alarm means 52 informs the administrator of the failure of the hard disk driver 48. When the hard disk driver 48 fails, the system control means 50 blocks the connection path of the hard disk driver 48 and connects the hard disk driver 49 to control the storage of the surveillance image to continue without interruption. do.

In addition, the system control means 50 reads the screen data written to the SDRAM 404 in real time without time compression in case of failure of the hard disk drivers 48 and 49 so as to be recorded on the video tape recorder 46. . Therefore, in the event of a failure of the hard disk driver, it is possible to save the surveillance video as a video on videotape.

As described above, according to the present invention, by time-compressing a surveillance video digitally and storing the time-compressed video data on an analog video tape, it is possible to record for a long time on a video tape using a general home VCR. Therefore, the system cost can be reduced by using a general home VCR, and a clear screen can be displayed by digitally processing the video signal and displaying it on a monitor during playback.

In addition, when storing video data on the hard disk, the video data can be classified and stored according to events, cameras, and time zones, and the stored video signals can be stored on the video tape. Display on the monitor allows you to use the various search functions available digitally.

In addition, by providing a plurality of hard disk drivers, it is possible to provide a countermeasure for the failure of the HDD, and in the event of a failure of the HDD, video recording with a video tape recorder can prevent surveillance recording interruption due to the HDD failure.

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.

Claims (11)

Digital storage means for recording and reproducing data on a digital recording medium; Converts an analog video signal into a digital video signal in real time, samples the converted digital video signal at a predetermined number of screens per second, records the sampled screen data into the digital storage means, and displays a predetermined amount or more of the screen on the digital storage means. Digital recording / reproducing control means for reading a predetermined amount of screen data when data is recorded and converting the read screen data into an analog video signal; And And a general video tape recorder for recording the converted analog video signal on a magnetic tape and reproducing the video signal recorded on the magnetic tape. The long time video recording and reproducing apparatus using a general video tape recorder according to claim 1, wherein the analog video signal inputted to said digital recording and reproducing control means is provided from a surveillance camera. The long-term video recording and reproducing apparatus using a general video tape recorder according to claim 1, wherein the digital storage means is a hard disk driver. delete 4. The digital recording / reproducing control means according to claim 3, An analog converter for converting an analog video signal into a digital video signal in real time; Memory means for storing the converted digital video signal every screen unit; Image compression means for sampling the digital image signal stored in the memory means at a predetermined number of screens per second and compressing the sampled screen data; Interface means for providing the compressed data through the image compression means to the hard disk driver and reading the stored compressed data when the data stored in the hard disk driver is equal to or larger than a predetermined amount; Image expansion means for decompressing the compressed data read out through the interface means; An index encoder for adding index information to the decompressed data; And And digital analog converting means for converting the digital video data to which the index is added, into an analog video signal. Converting an analog video signal provided from a surveillance camera into a digital video signal in real time; Sampling the digital video signal at a predetermined number of screens per second; Storing the sampled screen data in digital storage means; Reading a predetermined amount of screen data when a predetermined amount of screen data is stored in the digital storage means; Converting the read screen data into an analog video signal; And recording the converted analog video signal on a video tape by a general video tape recorder. 7. The general video tape recorder of claim 6, further comprising compressing the screen data before storing the screen data in the digital storage means, reading the data from the digital storage means, and then decompressing the compressed data. Long time video recording method. 7. The method of claim 6, further comprising adding index information to the read screen data before converting the analog video signal. Reproducing a video signal from a video tape on which a still picture is recorded; Converting the reproduced analog video signal into a digital video signal in real time; Extracting index information added to the digital video signal; Storing the digital video signal in digital storage means; Reading a digital video signal stored in the digital storage means in response to a read command by the extracted index information; Processing the read digital video signal into a screen display video signal; Converting the processed screen display video signal into an analog video signal; And And displaying the converted analog video signal on a monitor. The method of reproducing a video signal from a video tape recorded for a long time using a general video tape recorder. 10. The general video tape recorder of claim 9, further comprising compressing the screen data before storing the screen data in the digital storage means, reading the data from the digital storage means, and then decompressing the compressed data. A method of reproducing a video signal from a video tape that has been recorded for a long time. delete