cv2.imwrite(filename_pred_png, pred_depth_scaled, [cv2.IMWRITE_PNG_COMPRESSION, 0])
OpenCV报错
cv2.error: OpenCV(4.5.5) /io/opencv/modules/imgcodecs/src/loadsave.cpp:730: error: (-2:Unspecified error) could not find a writer for the specified extension in function ‘imwrite_’
报错原因：debug发现路径没有写文件后缀，应该写入.jpg或者.png
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