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  • 《Gamma correct》

    int ImageAdjust(IplImage* src, IplImage* dst,
    double low, double high, // X方向:low and high are the intensities of src
    double bottom, double top, // Y方向:mapped to bottom and top of dst
    double gamma )
    {
    double low2 = low*255;
    double high2 = high*255;
    double bottom2 = bottom*255;
    double top2 = top*255;
    double err_in = high2 - low2;
    double err_out = top2 - bottom2;
    int x,y;
    double val;
    if(low<0 && low>1 && high <0 && high>1&&
    bottom<0 && bottom>1 && top<0 && top>1 && low>high)
    return -1;
    // intensity transform
    for( y = 0; y < src->height; y++)
    {
    for (x = 0; x < src->width; x++)
    {
    val = ((uchar*)(src->imageData + src->widthStep*y))[x];
    val=pow((val - low2)/err_in, gamma)*err_out+bottom2;
    if(val>255)
    val=255;
    if(val<0)
    val=0; // Make sure src is in the range [low,high]
    ((uchar*)(dst->imageData + dst->widthStep*y))[x] = (uchar) val;
    }
    }
    return 0;
    }

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  • 原文地址:https://www.cnblogs.com/DeanWang/p/7077665.html
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