图像处理 OTSU 算法 在c++ 中的实现

OTSU /* * 功能: 大津二值法 * 参数: img为图像矩阵 * 返回: 二值化的阈值 */ #include <string.h> #define HEIGHT 1080 #define WIDTH 1920 unsigned char otsuBin(unsigned char img[][WIDTH]) { long greyHisto[256]; unsigned char greyMin = 0, greyMax = 255; memset(greyHisto, 0, 256 * sizeof(long)); // 获取灰度直方图 for (int row = 0; row < WIDTH; row++) for (int col = 0; col < HEIGHT; col++) { int greyVal = img[row][col]; greyHisto[greyVal]++; } // 获取灰度范围 for (int i = 0; i < 256; i++) { if (greyHisto[i] > 0) { greyMin = i; break; } } for (int i = 255; i >= 0; i--) { if (greyHisto[i] > 0) { greyMax = i; break; } }