c语言代码Ostu大津法

好的，以下是 C 语言代码 Ostu 大津法：

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main()
{
    int hist[256] = {0};
    int i, j, k;
    int threshold = 0;
    int sum = 0;
    int sumB = 0;
    int wB = 0;
    int wF = 0;
    double mB, mF;
    double max = 0.0;
    double between = 0.0;

    // 读取图像并计算直方图
    // ...

    // 计算总像素数
    for (i = 0; i < 256; i++) {
        sum += hist[i];
    }

    // 计算最佳阈值
    for (i = 0; i < 256; i++) {
        wB += hist[i];        if (wB == 0) {
            continue;
        }
        wF = sum - wB;
        if (wF == 0) {
            break;
        }
        sumB += i * hist[i];
        mB = (double)sumB / wB;
        mF = (double)(sum - sumB) / wF;
        between = (double)wB * (double)wF * pow(mB - mF, 2);
        if (between >= max) {
            threshold = i;
            max = between;
        }
    }

    printf("Threshold: %d\n", threshold);

    return 0;
}