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2012-07-05T13:55:46.227
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<p>There you go. This function return all locations found in the larg image, because small image could also multiple times contained in the large one. If you want, you can rewrite the function unsafe for more performance.</p> <pre><code>public static List<Point> GetSubPositions(Bitmap main, Bitmap sub) { List<Point> possiblepos = new List<Point>(); int mainwidth = main.Width; int mainheight = main.Height; int subwidth = sub.Width; int subheight = sub.Height; int movewidth = mainwidth - subwidth; int moveheight = mainheight - subheight; BitmapData bmMainData = main.LockBits(new Rectangle(0, 0, mainwidth, mainheight), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb); BitmapData bmSubData = sub.LockBits(new Rectangle(0, 0, subwidth, subheight), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb); int bytesMain = Math.Abs(bmMainData.Stride) * mainheight; int strideMain = bmMainData.Stride; System.IntPtr Scan0Main = bmMainData.Scan0; byte[] dataMain = new byte[bytesMain]; System.Runtime.InteropServices.Marshal.Copy(Scan0Main, dataMain, 0, bytesMain); int bytesSub = Math.Abs(bmSubData.Stride) * subheight; int strideSub = bmSubData.Stride; System.IntPtr Scan0Sub = bmSubData.Scan0; byte[] dataSub = new byte[bytesSub]; System.Runtime.InteropServices.Marshal.Copy(Scan0Sub, dataSub, 0, bytesSub); for (int y = 0; y < moveheight; ++y) { for (int x = 0; x < movewidth; ++x) { MyColor curcolor = GetColor(x, y, strideMain, dataMain); foreach (var item in possiblepos.ToArray()) { int xsub = x - item.X; int ysub = y - item.Y; if (xsub >= subwidth || ysub >= subheight || xsub < 0) continue; MyColor subcolor = GetColor(xsub, ysub, strideSub, dataSub); if (!curcolor.Equals(subcolor)) { possiblepos.Remove(item); } } if (curcolor.Equals(GetColor(0, 0, strideSub, dataSub))) possiblepos.Add(new Point(x, y)); } } System.Runtime.InteropServices.Marshal.Copy(dataSub, 0, Scan0Sub, bytesSub); sub.UnlockBits(bmSubData); System.Runtime.InteropServices.Marshal.Copy(dataMain, 0, Scan0Main, bytesMain); main.UnlockBits(bmMainData); return possiblepos; } private static MyColor GetColor(Point point, int stride, byte[] data) { return GetColor(point.X, point.Y, stride, data); } private static MyColor GetColor(int x, int y, int stride, byte[] data) { int pos = y * stride + x * 4; byte a = data[pos + 3]; byte r = data[pos + 2]; byte g = data[pos + 1]; byte b = data[pos + 0]; return MyColor.FromARGB(a, r, g, b); } struct MyColor { byte A; byte R; byte G; byte B; public static MyColor FromARGB(byte a, byte r, byte g, byte b) { MyColor mc = new MyColor(); mc.A = a; mc.R = r; mc.G = g; mc.B = b; return mc; } public override bool Equals(object obj) { if (!(obj is MyColor)) return false; MyColor color = (MyColor)obj; if(color.A == this.A && color.R == this.R && color.G == this.G && color.B == this.B) return true; return false; } } </code></pre>
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1. POFind Subimage in larger image in C#
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1. POFind Subimage in larger image in C#
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1. COWOW! Thank you so much!
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