Signal acquisition of embedded development synchronous---the role of vsync and HSync and the relationship between them

the role of VSync and HSync and the relationship between them

VSYNC and the HSYNC and the relationship between them .

VSYNC and the HSYNC is what

Vsync:vertical synchronization, which is synchronized with the number of frames on the monitor. In a nutshell, the vsync rendering process is enabled, the number of frames does not exceed the number of frames in the display, and a synchronization is performed. The sync is where the display scan line ends the last line of scanning and is ready to start the first line of scanning.

Hsync:horizonal synchronization, compared to VSync, the unit of synchronization falls from the frame to the line, which is to ensure that the operation does not appear in the middle of the scan line, but synchronizes to the next line.

Vblank: After the last line of the display scan line is completed , you need to return to the upper left corner . This process is called: Vblank, also called VBI (vertical blank interval), because the scan line becomes blank to prevent seeing a diagonal display on the screen.

VSYNC with the HSYNC frequency is related to what

HSYNC = Vsyncx total number of scanned rows

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Camera sensor the synchronization signal can be simply understood as: Camera sensor a signal sent to the receiving end of its signal.

L HSYNC is the sensor that tells the receiver that all the signal outputs of the sensor are in the same line during the "HSYNC" period of validity.

For VSync, for example, in the case of high-level active, theVSync is high until it is pulled down, and all the image data that the sensor outputs from this segment is formed into a frame.

The frequency of the synchronization signal is determined by pixel clock, such as a row has 640 pixel, then hsync frequency is:pclk/(640+dummy); VSync.

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Signal acquisition of embedded development synchronous---the role of vsync and HSync and the relationship between them