How it acquisition card CG410 only showed images of CCD camera in the middle section-CodePudding

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How it acquisition card CG410 only showed images of CCD camera in the middle section

Time：10-29

Now use it image acquisition card CG410 real-time display of the CCD camera video, appear constantly flashing, refresh speed slow, pulled the serious, why? Discharge the motherboard DMA channel speed slow,
In addition, how to show only the middle part of the CCD camera?
Pray god give directions!

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