[OpenCVsharp]利用指针实现高速访问像素RGB值

private void SearchBlockforYIQ(IplImage img){    using (IplImage src = img.Clone())    using (IplImage dst = new IplImage(src.Size, BitDepth.U8, 3))    {        src.CvtColor(dst, ColorConversion.BgrToRgb);//将bgr转为rgb         int h, w;        int index;        double y, i, q;         unsafe        {            byte* ptr = (byte*)dst.ImageData;            byte r, g, b;            for (h = 0; h < dst.Height; ++h)            {//270                for (w = 0; w < dst.Width; ++w)                {//360                    index = (dst.WidthStep * h) + (w * 3);                    r = ptr[index];                    g = ptr[index + 1];                    b = ptr[index + 2];                     y = (0.299 * r) + (0.587 * g) + (0.114 * b);                    i = (0.596 * r) + ((-0.274) * g) + ((-0.322) * b);                    q = (0.211 * r) + ((-0.523) * g) + (0.312 * b);                     if ((i >= 1) && (q < -4.0))//检测黄色                    {//变更为白色(白色的rgb值都是255)                        ptr[index] = 255;                        ptr[index + 1] = 255;                        ptr[index + 2] = 255;                    }                    else                    {//变更为黑色(黑色的RGB值都是0)                        ptr[index] = 0;                        ptr[index + 1] = 0;                        ptr[index + 2] = 0;                    }                }            }        }        pictureBoxIpl2.ImageIpl = dst;    }}