CN1102743A - Automatic recognition multichannel T.V monitoring and recording, playback system - Google Patents

Abstract

Video, signal processing, image storing, encoding and decoding techniques are used for time-share analog switching and splicing of multi-channel video signals. ID, record date, time and channel number are automatically superimposed on image signals in different channels to form multi-channel video record document for recording by video recorder and directly play. The image signals in any channel are automatically identified and selected by the ID. Each frame of image may be displayed repeatedly because of image storage.

Description

Automatic recognition multichannel T.V monitoring and recording, playback system

The present invention relates to video technique, information processing and digital circuit.

Before the present invention, in the multi-path monitoring system as will monitor severally during to tens scenes, main method has: 1. the multi-channel television picture intelligence shows that with monitor personnel manually monitor by supervision respectively, when accident need be write down, insert video tape recorder with manual operation immediately and make video record.2. the multi-channel TV signals of a plurality of scenes method with the time-division is shown and video.3. multiple signals are shown respectively and record.The 1st kind of method be owing to be manually-operated, thereby accident often can not in time process and record complete data, the 2nd kind of method since the multi-channel TV signals time-division show and record, often imperfect for the real record material of sending out event.Show and record that as No. 5 gamma cameras being arranged in the multi-path monitoring system and doing the time-division by 5 seconds intervals then every road picture intelligence is that 5 seconds demonstration and typing were arranged every 25 seconds.Doing between the each demonstration of one road playback time 20 seconds blank time interval is arranged.Though the 3rd kind of method can the All Time demonstration and record material but require equipment many, the cost height.The present invention adopts the method for automatic identification to consist of the multi-channel television surveillance, with multi-channel TV signals splicing and stack identification code, demonstration and playback time detect identification code automatically, and deposit in the memory behind the image digitization with required demonstration, overcome the shortcoming that the time-division shows blank spaces repeatedly to read display mode, realize demonstration and the typing of multi-channel television image with lower cost, and have record material complete, simple to operate, the advantages such as visual continuity is good of resetting.

Fig. 1 identifies multi-channel television to monitor the recording-reproducing system block diagram automatically.

Fig. 2 is that identification code stack sequential expands display timing generator figure.

Fig. 3 is that theory diagram is carried out in typing and demonstration simultaneously.

Frame of broken lines a and frame of broken lines b are respectively typing and the playback subsystem in the automatic identification multi-channel television supervision recording-reproducing system in Fig. 1 system block diagram.

Input system N platform gamma camera is controlled by synchronous generator, with external sync mode work.The strange field sync signal that synchronous generator produces is given channel controller.Number of channel N in the channel controller is that the gamma camera number of units is by artificial setting.Channel controller is with strange field sync signal control analog switch matrix, switches and gives the identification code superimposer sending into the defeated stream of N road TV signal in the analog switch matrix, make N road TV signal in order frame by frame splicing see shown in Figure 2.The identification code generator is synchronous by channel controller control and analog switch matrix, and corresponding different channel produces corresponding identification code, is that the clock serial shift of synchronizing signal is exported to the identification code superimposer with the frequency of subcarrier.The identification code superimposer is superimposed on identification code on the vision signal.Identification code is superimposed upon on a certain suitable row of image, and repeats stack repeatedly in this journey, to guarantee high playback identification certainty.In analog switch matrix, also be provided with the black level signal commutation circuit and when input signal is less than the N road, can insert black level signal automatically to guarantee system's operate as normal.The station symbol superimposer is in time that each road picture intelligence is superimposed with the corresponding number of channel and is recorded into.Station mark generator produces the number of channel, and the time is supplied with station symbol supercircuit and light-emitting diode display, shows in real time date of entry and time.TV signal after the station symbol superimposer is handled is for the video tape recorder record or for showing.

The input of playback system is the output signal of input system or the multi-channel analog picture intelligence on the typing videotape.Multichannel typing signal is at first given A/D and identification code detector when resetting demonstration.In detecting, identification code detects the identification code in each frame, and compare with given channel identification code in the identification code selector, after relatively confirming, give digital switch more than twice, to send in the F1F0 frame storage through the digital television signal after the A/D conversion, when non-selected signal arrives, excise by digital switch; The F1F0 memory is only done and is read.The output of D/A converter repeats N time and sends the same frame image of selecting signal in non-selected frame signal holding time like this.The animated image of the visual per second 25/N frame of on monitor, seeing like this.The clock of supplying with D/A, F1F0, A/D and identification code detector is to be produced by the subcarrier of burst signal through phase-locked recovery.The signal that this system can flexible choice resets is when needs freeze to show a certain frame picture, as long as video tape recorder this system that " fixes " can be realized fixing.Native system only can be realized multiple signals are carried out the time-division video with a video tape recorder, and each road signal is recording occurring continuously preferably.

The present invention also can be connected in actual use the typing demonstration and carry out simultaneously and mode, and connection figure sees Fig. 3.

Claims (2)

1, the present invention adopts video technique, signal processing technology, image memory technology and encoding and decoding technique etc. that multi-channel video signal is done time division analogue switching and splicing, and stack identification code, date of entry, time and channel number composition multichannel video data can also can be used for showing for the video typing automatically on the picture intelligence of different channels.Characteristics of the present invention are to record simultaneously the multichannel picture intelligence at a dish on the videotape, reset and show and can select as required wherein a certain road record, and the visual visual continuity of resetting is good, intuitive display, automatically identification, easy to operate, the ratio of performance to price is high.

2, the mode of the number of channel N among the present invention, identification code, identification code stack, identification code detection and connecting method all can be realized by multiple mode and circuit.

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