c/c++开发分享C语言实现BMP图像边缘检测处理实例为大家分享了c语言实现bmp图像边缘检测处理的具体代码,供大家参考,具体内容如下
以sobel算子为例,其余模板算子卷积代码部分同sobel算子。如:高斯算子、拉普拉斯算子等
#include <stdio.h> #include <stdlib.h> #include <windows.h> #include <math.h> int main(int* argc, char** argv) { file* fp = fopen("./01.bmp", "rb"); if (fp == 0) return 0; bitmapfileheader filehead; fread(&filehead, sizeof(bitmapfileheader), 1, fp); bitmapinfoheader infohead; fread(&infohead, sizeof(bitmapinfoheader), 1, fp); int width = infohead.biwidth; int height = infohead.biheight; int bicount = infohead.bibitcount; int linebyte = (bicount*width / 8 + 3) / 4 * 4; rgbquad* pcolortable; pcolortable = new rgbquad[256]; fread(pcolortable, sizeof(rgbquad), 256, fp); unsigned char* pbmpbuf; pbmpbuf = new unsigned char[linebyte*height]; fread(pbmpbuf, linebyte*height, 1, fp); fclose(fp); // 新图 file* fop = fopen("sobel.bmp", "wb"); if (fop == 0) return 0; unsigned char *pbmpbuf2; // 初始化 pbmpbuf2 = new unsigned char[linebyte*height]; for (int i = 0; i < height; ++i){ for (int j = 0; j < width; ++j){ *(pbmpbuf2 + i*linebyte + j) = *(pbmpbuf + i*linebyte + j); } } int ul, uc, ur, dl, dc, dr; int lu, lc, ld, ru, rc, rd; double hir, vec; for (int i = 1; i < height - 1; ++i){ for (int j = 1; j < width - 1; ++j){ // 垂直梯度算子:检测水平边缘 vec = 0; ul = *(pbmpbuf + (i + 1)*linebyte + (j - 1))*(-1); uc = *(pbmpbuf + (i + 1)*linebyte + j)*(-2); ur = *(pbmpbuf + (i + 1)*linebyte + j)*(-1); dl = *(pbmpbuf + (i - 1)*linebyte + (j - 1)) * 1; dc = *(pbmpbuf + (i - 1)*linebyte + j) * 2; dr = *(pbmpbuf + (i - 1)*linebyte + j) * 1; vec = ul + uc + ur + dl + dc + dr; // 水平梯度算子:检测垂直边缘 hir = 0; lu = *(pbmpbuf + (i + 1)*linebyte + (j - 1))*(-1); lc = *(pbmpbuf + (i - 0)*linebyte + (j - 1))*(-2); ld = *(pbmpbuf + (i - 1)*linebyte + (j - 1))*(-1); ru = *(pbmpbuf + (i + 1)*linebyte + (j + 1)) * 1; rc = *(pbmpbuf + (i - 0)*linebyte + (j + 1)) * 2; rd = *(pbmpbuf + (i - 1)*linebyte + (j + 1)) * 1; hir = lu + lc + ld + ru + rc + rd; *(pbmpbuf2+i*linebyte+j) = round(sqrt(hir*hir + vec*vec)); } } fwrite(&filehead, sizeof(bitmapfileheader), 1, fop); fwrite(&infohead, sizeof(bitmapinfoheader), 1, fop); fwrite(pcolortable, sizeof(rgbquad), 256, fop); fwrite(pbmpbuf2, linebyte*height, 1, fop); fclose(fop); system("pause"); return 0; }
实验结果:
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