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dm6446图像显示问题



我使用的是dm6446的开发板,在跑videoloopback的时候,黑白图像显示的时候下边缘有几条白色的条纹,彩色显示的时候下边缘显示有几条紫色的条纹。但是使用板子带个例子encodedecode显示是正常的,videoloopback的例子是TDK6446开发板的例子,问题出现在哪啊?如果想在DSP端编写算法,如何操作啊?相关的资料能否提供啊?