BMP图像差分/比较 

  1 #include <stdio.h>
  2 #include <stdlib.h>
  3 #include <string.h>
  4 
  5 int main(int argc, char *argv[])
  6 {
  7     int row, col;
  8     int width, height, widthbyte, bitcount, imagesize, bytecount;
  9     const char *magenta = NULL;
 10     const char *magendiff = NULL;
 11     unsigned char header[] =
 12     {
 13         0x42, 0x4D, 0xAA, 0xAA, 0xAA, 0xAA, 0x00, 0x00, //  2 AA->FileSize
 14         0x00, 0x00, 0xBB, 0xBB, 0xBB, 0xBB, 0x28, 0x00, // 10 BB->OffBits
 15         0x00, 0x00, 0xCC, 0xCC, 0xCC, 0xCC, 0xDD, 0xDD, // 18 CC->Width
 16         0xDD, 0xDD, 0x01, 0x00, 0xEE, 0xEE, 0x00, 0x00, // 22 DD->Height
 17         0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, // 28 EE->BitCount
 18         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // 34 FF->ImageSize
 19         0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 20     };
 21     
 22     FILE *fpA = NULL;
 23     FILE *fpB = NULL;
 24     FILE *fpC = NULL;
 25     const char *filenameA = "A.bmp";
 26     const char *filenameB = "B.bmp";
 27     const char *filenameC = "C.bmp";
 28     unsigned char *rowbufA = NULL;
 29     unsigned char *rowbufB = NULL;
 30     
 31     const char * errmsg = NULL;
 32 
 33     switch(argc)
 34     {
 35     case 1:
 36         break;
 37     case 2:
 38         break;
 39     case 3:
 40         filenameA = argv[1];
 41         filenameB = argv[2];
 42         break;
 43     case 4:
 44         filenameA = argv[1];
 45         filenameB = argv[2];
 46         filenameC = argv[3];
 47         break;
 48     }
 49     
 50     do
 51     {
 52         fpA = fopen(filenameA, "rb");
 53         if(fpA == NULL) { errmsg = "A.bmp open failed"; break; };
 54         
 55         fpB = fopen(filenameB, "rb");
 56         if(fpB == NULL) { errmsg = "B.bmp open failed"; break; };
 57     
 58         // read file A.bmp
 59         fread(header, sizeof(header), 1L, fpA);
 60         width = *((int *)(header + 18));
 61         height = *((int *)(header + 22));
 62         bitcount = *((short *)(header + 28));
 63         imagesize = *((int *)(header + 34));
 64         widthbyte = (width * bitcount + 31) / 32 * 4;
 65         bytecount = bitcount / 8;
 66         switch(bitcount)
 67         {
 68         case 16:
 69             magenta = "\x1F\x7C";
 70             magendiff = "\x1F\x7C"; 
 71             break;
 72         case 24:
 73         case 32:
 74             magenta = "\x00\x00\x00\x00";
 75             magendiff = "\x00\x00\xFF\xFF";
 76             break;
 77         default:
 78             errmsg = "A.bitcount != 16 or 24 or 32";
 79             break;
 80         }
 81         if(errmsg) break;
 82         
 83         // check file B.bmp
 84         fread(header, sizeof(header), 1L, fpB);
 85         if(width != *((int *)(header + 18))) { errmsg = "A.width != B.width"; break; }
 86         if(height != *((int *)(header + 22))) { errmsg = "A.height != B.height"; break; }
 87         if(bitcount != *((short *)(header + 28))) { errmsg = "A.bitcount != B.bitcount"; break; }
 88         if(imagesize != *((int *)(header + 34))) { errmsg = "A.imagesize != B.imagesize"; break; }
 89         
 90         rowbufA = (unsigned char *)malloc(widthbyte);
 91         if(rowbufA == NULL) { errmsg = "rowbufA malloc failed"; break; }
 92         
 93         rowbufB = (unsigned char *)malloc(widthbyte);
 94         if(rowbufB == NULL) { errmsg = "rowbufB malloc failed"; break; }
 95                         
 96         fpC = fopen(filenameC, "wb");
 97         if(fpC == NULL) { errmsg = "C.bmp open failed"; break; };
 98 
 99         // wirte file C.bmp
100         fwrite(header, sizeof(header), 1L, fpC);
101         for(row = 0; row < height; row++)
102         {
103             fread(rowbufA, widthbyte, 1, fpA);
104             fread(rowbufB, widthbyte, 1, fpB);
105     
106             for(col = 0; col < width; col++)
107             {
108                 if(memcmp(rowbufA + bytecount * col, rowbufB + bytecount * col, bytecount) == 0)
109                 {
110                     memcpy(rowbufB + bytecount * col, magenta, bytecount);
111                 }
112                 else
113                 {
114                     memcpy(rowbufB + bytecount * col, magendiff, bytecount);
115                 } 
116             }
117     
118             fwrite(rowbufB, widthbyte, 1, fpC);
119         }
120         
121     } while(0);
122 
123     if(fpA) fclose(fpA);
124     if(fpB) fclose(fpB);
125     if(fpC) fclose(fpC);
126     if(rowbufA) free(rowbufA);
127     if(rowbufB) free(rowbufB);
128 
129     if(errmsg)
130     {
131         printf("%s\n", errmsg);
132         system("PAUSE");
133     }
134 
135     return 0;
136 }
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posted @ 2016-12-14 19:28  ply616  阅读(191)  评论(0)    收藏  举报