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sipeed / MaixPy-v1

MicroPython for K210 RISC-V, let's play with edge AI easier
https://wiki.sipeed.com/maixpy
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VGA compress JPEG error #466

Closed znstj closed 2 years ago

znstj commented 2 years ago

图像由RGB565或YUV422压缩为JPEG格式时，出现错误

右下角最后一个8*8的huffman数据段出现错误 JPEGsnoop错误如下： ERROR: Can't find huffman bitstring @ 0x00008181.3, table 1, value [0xfffec800] ERROR: Bad huffman code @ 0x00008181.2 *** ERROR: Bad scan data in MCU(79,59): Chr(Cr) CSS(0,0) @ Offset 0x00008181.3 MCU located at pixel=(632,472) 偶尔出现，同一张图片，压缩比一致，多次压缩必然重复出现该错误。

未发现错误原因

znstj commented 2 years ago

换了OPENMV旧的jpeg算法以解决，https://github.com/openmv/openmv/blob/bc6d1d22f0/src/omv/imlib/jpeg.c 暂时不知道原因在哪里