本文實例為大家分享了C語言實現BMP圖像邊緣檢測處理的具體代碼，供大家參考，具體內容如下
以Sobel算子為例，其余模板算子卷積代碼部分同Sobel算子。如：高斯算子、拉普拉斯算子等
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#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); // 新圖 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：檢測水平邊緣 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：檢測垂直邊緣 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;} |
實驗結果：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/fengxianghui01/article/details/85253135
