Jitter-free post-correction system for digital video interface (DVI)/high definition multimedia interface (HDMI)/display port (DP)/video graphics array (VGA) signals
A signal and field signal technology, applied in the parts of TV systems, image communication, color TV parts, etc., can solve problems such as affecting the viewing effect, and achieve the elimination of black screen or blurry screen, elimination of recognition and image recovery time, Play smoothly
Inactive Publication Date: 2012-09-26
大连科迪视频技术有限公司
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Problems solved by technology
In the actual use environment, when switching DVI / HDMI / DP / VGA signals, it will cause a black screen or blue screen for 2-10 seconds, which seriously affects the viewing effect, especially in large-scale, multi-screen, etc. that require frequent signal switching. Even more intolerable in surveillance systems or video conferencing
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[0018] Such as Figure 1 to Figure 4 As shown, the post-stage shake-free correction system of the DVI / HDMI / DP / VGA signal includes the following steps:
[0019] (1) The correction system collects the input DVI / HDMI / DP signal or VGA signal through the signal acquisition unit, and the signal acquisition unit processes the above-mentioned signals and outputs RGB signals, signal excitation clock CLK, and valid data strobe signals in parallel DE, line signal H and field signal V are given to the core processing unit I;
[0020] (2) The core processing unit I judges the resolution of the input signal according to the collected signal excitation clock CLK, the line signal H and the field signal V (that is: judges the resolution), and then uses the board according to the judged resolution format The crystal-loaded oscillator generates a horizontal signal H1 and a vertical signal V1 of the same frequency (namely: horizontal signal and vertical signal in this resolution format), and out...
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The invention discloses a jitter-free post-correction system for digital video interface (DVI) / high definition multimedia interface (HDMI) / display port (DP) / video graphics array (VGA) signals. A signal acquisition unit acquires the input DVI, HDMI, DP or VGA signals. A core processing unit I judges the acquired signals. An intelligent clock simulation unit generates a standard drive clock CLKPLL,and transmits the standard drive clock CLKPLL back to the core processing unit I. The core processing unit I detects whether the acquired signals are accurate or not. If the acquired signals are accurate, the core processing unit I writes red, green and blue (RGB) signals into an external storage unit, and a core processing unit II reads RGB data finally stored into the core processing unit I. Ifthe acquired signals are inaccurate, the core processing unit I stops writing data into the external storage unit, and the core processing unit II continuously reads the accurate complete data of theprevious frame. The core processing unit II transmits the read RGB data to a signal output unit for processing and output. The system can eliminate minus effects such as screen blacking or screen blurring and the like produced by signal switching to make smoother the broadcasting.
Description
technical field [0001] The invention relates to a post-stage shake-free correction system for DVI / HDMI / DP / VGA signals. Background technique [0002] In recent years, with the continuous development of digital video technology, the proportion of DVI (Digital Video Interface) video signal, HDMI (High Definition Multimedia Interface) video signal and DP (Display Portr) video signal in practical applications is also increasing. . DVI / HDMI / DP signal belongs to digital video signal, but because it does not have line signal and field signal like composite video signal (CVBS) or SAV (start signal) and EAV (end signal) like SDI signal, so it cannot be like Like CVBS and SDI digital signals, the loss or interruption of the signal can be detected instantaneously by means of data analysis, and the image resolution of DVI / HDMI / DP signal transmission is high, and the transmission rate is as high as 1.65Gbps or even 2.25Gbps. Traditional video processing technology cannot It performs acc...
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IPC IPC(8): H04N5/262H04N5/268
Inventor 周春雷张坛
Owner 大连科迪视频技术有限公司