本文实例为大家分享了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：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
