Convert between OpenCV Mat and Leptonica Pix

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清酒与你
清酒与你 2021-02-06 16:06

I need to convert between OpenCV Mat image and Leptonica Pix image formats in C++. This is being used for binarization of 8bit gray images.

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  •  名媛妹妹
    2021-02-06 16:53

    I found found @ikarliga's answer worked for me because what I needed was to actually convert to the Mat format not necessarily use it with the Tesseract API which is what that OP was asking.

    Here are both the functions I use. The pix8ToMat function is taken from the node-dv project

    Pix *mat8ToPix(cv::Mat *mat8)
    {
        Pix *pixd = pixCreate(mat8->size().width, mat8->size().height, 8);
        for(int y=0; yrows; y++) {
            for(int x=0; xcols; x++) {
                pixSetPixel(pixd, x, y, (l_uint32) mat8->at(y,x));
            }
        }
        return pixd;
    }
    
    cv::Mat pix8ToMat(Pix *pix8)
    {
        cv::Mat mat(cv::Size(pix8->w, pix8->h), CV_8UC1);
        uint32_t *line = pix8->data;
        for (uint32_t y = 0; y < pix8->h; ++y) {
            for (uint32_t x = 0; x < pix8->w; ++x) {
                mat.at(y, x) = GET_DATA_BYTE(line, x);
            }
            line += pix8->wpl;
        }
        return mat;
    }
    

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