How to use C language to realize BMP Image Edge Detection
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Take Sobel operator as an example, the convolution code of other template operators is partly the same as Sobel operator. Such as: Gaussian operator, Laplace operator, etc.
# include # include 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); / / New figure FILE* fop = fopen ("sobel.bmp", "wb"); if (fop = 0) return 0; unsigned char* pBmpBuf2; / / initialization 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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