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2012-03-11T17:10:59.303
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2012-03-12T20:54:23.647
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2012-03-12T20:54:23.647
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<p>For completeness, here is modified version of thresholding image in RG Chromaticity color space it's more than 2 times faster than the version in my Question.</p> <p><pre> public static Bitmap ThresholdRGChroma(Bitmap original, Rectangle roi, double angle, double width, double satMin, double satMax) { Bitmap bimg = new Bitmap(original.Width, original.Height, PixelFormat.Format1bppIndexed);</p> <code> BitmapData imgData = original.LockBits(new Rectangle(0, 0, original.Width, original.Height), ImageLockMode.ReadOnly, original.PixelFormat); BitmapData bimgData = bimg.LockBits(new Rectangle(0, 0, bimg.Width, bimg.Height), ImageLockMode.ReadWrite, bimg.PixelFormat); int pixelSize = 3; double r, g, sat, m; double satMin2 = satMin * satMin; double satMax2 = satMax * satMax; double cr = Math.Sin((2 * Math.PI * angle) / 360.0); double cg = Math.Cos((2 * Math.PI * angle) / 360.0); // Instead of (Math.Cos(2 * width / 180.0) + 1) / 2.0 I'm using pre-calculated <1; 0> values. double w2 = -width; unsafe { byte* R, G, B; byte* row; int RGBSum; for (int y = original.Height - 1; y >= 0; y--) { row = (byte*)imgData.Scan0 + (y * imgData.Stride); for (int x = original.Width - 1; x >= 0; x--) { B = &row[x * pixelSize]; G = &row[x * pixelSize + 1]; R = &row[x * pixelSize + 2]; RGBSum = *R + *G + *B; if (RGBSum == 0) { SetIndexedPixel(x, y, bimgData, false); continue; } r = (double)*R / RGBSum - _rgChromaOriginX; g = (double)*G / RGBSum - _rgChromaOriginY; m = cr * r + cg * g; sat = r * r + g * g; if (m > 0 && m * m > w2 * w2 * sat && sat >= satMin2 && sat <= satMax2) SetIndexedPixel(x, y, bimgData, true); else SetIndexedPixel(x, y, bimgData, false); } } } bimg.UnlockBits(bimgData); original.UnlockBits(imgData); return bimg; } </code></pre>
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1. POHow to speed up my color thresholding in C#
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1. USLadislavM
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1. USLadislavM
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