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dm368 vpfe sensor

硬件:dm368 通过vpfe外接 sensor,此sensor 与dm368连接有10bit 数据线,bayer格式的raw数据输入

sensor--->isif----->ddr,保存raw数据到ddr内,利用A-Law把10数据压缩为8bit保存

但是ddr内保存的图片是有好多噪点,好像368 vpfe做了什么优化似的,图片如下,请麻烦分析一下原因,先谢谢了