c++ - Compress Mat into Jpeg And save the result into memory

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Since You did not specify a programming language. I am going to give you the answer in C++.

    std::vector<uchar> buff;//buffer for coding
    std::vector<int> param(2);
    param[0] = cv::IMWRITE_JPEG_QUALITY;
    param[1] = 80;//default(95) 0-100
    cv::imencode(".jpg", mat, buff, param);
                I have trie this,but if i write buff into a jpeg file,i cant't open the file as a jpeg picture.When i tried to open it ,a error occured.
– charlie
                Nov 5, 2015 at 7:42
                if he writes the received data as byte stream to some file, I think it would work.  The point is " DO NOT EVER deal with JPEG stream as an image. It is NOT an image
– Humam Helfawi
                Nov 5, 2015 at 7:58
                Theoretically they are the same. In practise you gonna find some differences because of the compression algorithm and the compression ratio
– Humam Helfawi
                Nov 5, 2015 at 8:57
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