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A kind of video signal transmission method

A technology of video signal and transmission method, applied in the field of video transmission, can solve the problems of limited image quality, color leakage, edge false color, etc., and achieve the effect of reducing edge false color, low attenuation, and improving color clarity.

Active Publication Date: 2017-12-01
SHANGHAI FULLHAN MICROELECTRONICS
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  • Description
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Problems solved by technology

This can cause color bleeding and edge false colors, limiting further improvement in image quality

Method used

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  • A kind of video signal transmission method
  • A kind of video signal transmission method
  • A kind of video signal transmission method

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Embodiment Construction

[0023] The overall processing method of the present invention for the high-definition video signal is similar to that of the prior art: the input digital high-definition video signal is decomposed into brightness and color difference signals, and processed separately, the processed chrominance signal and brightness signal are superimposed, and a synchronization signal is added And the audio / control signal is finally converted to analog signal for transmission via coaxial cable. The methods and devices are similar to the existing common technologies and will not be repeated here.

[0024] The present invention is also similar to the existing common technology in terms of luminance signal processing, and both adopt the mode of direct baseband transmission, the luminance signal is directly transmitted in the channel without modulation, and a low-pass filter can be used to limit the bandwidth of the luminance signal to avoid Interference with the chrominance signal.

[0025] refe...

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Abstract

The invention discloses a video signal transmission method, comprising the following steps: inputting a video signal; decomposing the video signal into a brightness signal and a color difference signal; processing the brightness signal and the color difference signal respectively, and superimposing the processed brightness signal and the color difference signal , converted into an analog signal and then transmitted; the step of processing the color difference signal further includes: extracting a first color difference component signal and a second color difference component signal from the color difference signal through a color difference separation module, and separating the two color difference component signals Send it into the buffer for temporary storage; take out two color difference component signals from the buffer through a color difference rearrangement module, and combine them into a multiplexed color difference signal; use a VSB-AM modulator to modulate the multiplexed color difference signal to a set A chrominance signal is obtained on the subcarrier. While maintaining the advantages of existing analog high-definition transmission, the method can better adapt to the characteristics of various channels, improve image quality, and increase transmission distance.

Description

technical field [0001] The invention belongs to the field of video transmission, and relates to a method and device for transmitting video signals on coaxial cables, in particular to a method for transmitting high-definition analog video signals on coaxial cables. Background technique [0002] At present, analog video transmission based on coaxial cable is widely used in various CCTV monitoring system applications. But its transmission standard CVBS (composite video broadcast signal, composite TV broadcast signal) can only meet the requirements of standard definition applications. Therefore, digital transmission technologies are usually used in high-definition applications, such as HD-SDI (high-definition serial digital interface, high-definition serial digital interface) or digital cameras based on compressed video. But these systems have some inherent drawbacks. HD-SDI uncompressed digital video transmission technology has the advantages of low delay and high image quali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/10H04N7/015H04N9/64
Inventor 诸悦田景军
Owner SHANGHAI FULLHAN MICROELECTRONICS
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