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FPGA-based video synchronous switching system and method

A video synchronization and switching system technology, applied in the field of signal processing, can solve the problems of reduced image quality, large video channel delay, and low integration, and achieve the effect of over-extending image lines, simple circuits, and high integration

Active Publication Date: 2015-08-12
BANGYAN TECH
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AI Technical Summary

Problems solved by technology

[0003] At present, many video switching methods are based on analog devices, the implementation method is very inflexible, and the integration level is not high
The switching method of combinational logic will lead to excessive delay of the video channel, which cannot effectively support high-resolution and high-data-rate video formats, thereby reducing image quality, especially for high-definition video, whose video quality after switching is greatly reduced
And the professional switching chip is not flexible enough, it can only adapt to a specific video switching mode, and cannot support subsequent upgrades

Method used

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  • FPGA-based video synchronous switching system and method

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Embodiment 1

[0055] Such as Figure 7 The schematic diagram of a specific embodiment of the present invention shown, the multi-channel analog video signal is converted into the multi-channel digital video signal through the AD conversion module, and the high-speed detection clock that the resolution detection module produces with the clock processing module is to the multi-channel output of the AD conversion module The channel digital video signal is sampled, and the collected relevant parameters are submitted to the central processing unit through the CPU interface module. The central processing unit sets the AD conversion module according to the corresponding parameters, and receives and transmits the external switching finger parameters.

[0056] The first signal synchronization module performs multi-level synchronization on multi-channel digital video signals by inserting multi-level registers on the signal transmission path, reduces the line delay between registers, improves the operat...

Embodiment 2

[0061] This embodiment is based on the arbitrary synchronous switching output of 5-way VGA video input to 4-way VGA video.

[0062] Such as Figure 8 The schematic block diagram of another specific embodiment is shown, 5 channels of VGA video signals are input, and converted into digital video information in RGB888 color mode by an AD decoding chip. Since the VGA decoding chip cannot determine the effective area of ​​the video output, the effective area of ​​the output needs to be set by the central processing unit. If the central processing unit does not know its resolution, the effective area of ​​the video output will be deviated. As a result, when the monitor outputs, it will cause black borders to appear in the video. The clock processing module multiplies the frequency of the external input clock to generate the high-speed detection clock required by the VGA resolution detection module. The clock logic module can also eliminate duty cycle distortion of the external inp...

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Abstract

The invention provides a FPGA-based video synchronous switching system and method. The FPGA-based video synchronous switching system comprises an AD conversion module, a DA conversion module, a resolution detection module which conducts sampling on a digital video signal and outputs relevant sampling parameter, a central processor which adjusts the output of the AD conversion module, receives and outputs the external switching parameter; a CPU interface module, a first signal synchronization module which conducts multistage synchronization on multipath digital video signals; a synchronization logic switching module which conducts switching output on the synchronized multipath digital video signal based on the switching parameter; a clock processing module which conducts frequency multiplication on the input clock signal and outputs a high speed detection clock signal to a resolution detection module. The FPGA-based video synchronous switching system and method are advantageous in that the multipath video output can be switched at will, and the switching of multiple resolution videos can be supported under the guarantee of image quality; the problems of a conventional switching mode that image quality is reduced, integrated level is not high and use is not flexible can be resolved. The invention can be widely used in the filed of signal processing.

Description

technical field [0001] The present invention relates to the field of signal processing, and more specifically, to an FPGA-based video synchronous switching system and method. Background technique [0002] With the rapid expansion of the video field, there are more and more video formats and higher resolutions. Users have higher and higher requirements for video clarity, and the demand for video switching is also becoming more and more extensive. [0003] At present, many video switching methods are based on analog devices, and the implementation method is very inflexible and the integration level is not high. The switching method of combinational logic will lead to excessive delay of the video channel, which cannot effectively support high-resolution and high-data-rate video formats, thereby reducing image quality, especially for high-definition video, whose video quality after switching is greatly reduced. The professional switching chip is not flexible enough, it can onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/268H04N5/04
CPCH04N5/268H04N5/04
Inventor 杨磊
Owner BANGYAN TECH
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