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摄像头拍摄黑色物体有紫红色花斑

Other Parts Discussed in Thread: DM3730

使用的是DM3730+AR0130,摄像头自带一个isp,DM3730使用ccdc模式接受yuy2信号,vga模式pc端显示出来图像,但是拍摄黑色物体显示有花斑闪烁,请问是什么造成的。驱动解码器是用tvp514x改过来的,前段输入信号经FAE测试,没有这个现象。请教一下大致是哪里有问题。下面是我传上来的图片。