. NET Picture Pixel comparison

        <summary>///image comparison. Used to find the difference between two images////</summary> public class Imagecomparer {//<summary>///Image Color///</summary> [StructLayout (layou  TKIND.EXPLICIT)] Private struct Iccolor {[FieldOffset (0)] public byte                B                [FieldOffset (1)] public byte G;            [FieldOffset (2)] public byte R;            }///<summary>///by 20*20 size to compare two images. </summary>//<param name= "BMP1" ></param>//<param name= "BMP2" ></p aram>//<returns></returns> public static list<rectangle> Compare (Bitmap bmp1            , Bitmap bmp2) {return Compare (BMP1, BMP2, New Size (20, 20)); }///<summary>///Compare two images///&Lt;/summary>//<param name= "BMP1" ></param>//<param name= "BMP2" &GT;&LT;/PARAM&G            T <param name= "block" ></param>///<returns></returns> public static list& Lt Rectangle> Compare (Bitmap bmp1, Bitmap bmp2, Size block) {list<rectangle> rects = new                List<rectangle> ();                PixelFormat PF = Pixelformat.format24bpprgb; BitmapData BD1 = bmp1. LockBits (New Rectangle (0, 0, Bmp1. Width, Bmp1.                Height), imagelockmode.readonly, PF); BitmapData Bd2 = bmp2. LockBits (New Rectangle (0, 0, bmp2. Width, BMP2.                Height), imagelockmode.readonly, PF);                        try {unsafe {int w = 0, h = 0; while (H < bd1. Height && H < Bd2. Height) {byte* P1 = (byte*) bd1. Scan0 + H * BD1.Stride; byte* P2 = (byte*) bd2. Scan0 + H * bd2.                            Stride;                            w = 0; while (W < BD1. Width && W < Bd2. Width) {//scan by block size for (int i = 0; I < block. Width;                                    i++) {int WI = w + i; if (WI >= bd1. Width | | WI >= bd2.                                    Width) break; for (int j = 0; J < block. Height;                                        J + +) {int HJ = h + j; if (HJ >= bd1. Height | | HJ >= Bd2.                                        Height) break; iccolor* PC1 = (iccolor*) (P1 + wi * 3 + BD1.                                        Stride * j); iccolor* PC2 = (iccolor*) (P2 + wi * 3 + bd2.                                  Stride * j);      if (Math.Abs (pc1->r-pc2->r) >10 | | pc1->g! = PC2-&GT;G | | pc1->b! = pc2->b) if (Math.Abs (pc1->r-pc2->r) > 100 | | Math.Abs (pc1->g-pc2->g) > 100 | |                                            Math.Abs (pc1->b-pc2->b) > 100) {                                            The current block has a pixel point with a different color value. int bw = Math.min (block. Width, Bd1.                                            WIDTH-W); int BH = math.min (block. Height, Bd1.                                            HEIGHT-H); Rects.                                            ADD (New Rectangle (W, h, BW, BH));                                        Goto E;                                }}} E: W + = block.                            Width; } H + = block.                        Height;        }            }} finally {Bmp1.                    Unlockbits (BD1); Bmp2.                Unlockbits (BD2);            } return rects; }        }

　　

. NET Picture Pixel comparison