ccs实现直方图均衡化C语言代码

直方图均衡化是一种图像处理方法，可以增强图像的对比度和亮度。以下是一个简单的 C 语言代码实现：

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

#define MAX_PIXEL_VALUE 255
#define HISTOGRAM_SIZE 256

int main() {
    int width, height, max_gray;
    int i, j, k, pixel;
    unsigned char *image_in, *image_out;
    int histogram[HISTOGRAM_SIZE] = {0};
    int cumulative_hist[HISTOGRAM_SIZE] = {0};
    float cumulative_hist_norm[HISTOGRAM_SIZE] = {0.0};

    // 读取图像数据
    FILE *file_in = fopen("input_image.pgm", "rb");
    if (!file_in) {
        printf("Error: Could not open input file.\n");
        return 1;
    }

    fscanf(file_in, "P5\n%d %d\n%d\n", &width, &height, &max_gray);
    image_in = (unsigned char*)malloc(sizeof(unsigned char) * width * height);
    fread(image_in, sizeof(unsigned char), width * height, file_in);
    fclose(file_in);

    // 计算直方图
    for (i = 0; i < width * height; i++) {
        histogram[image_in[i]]++;
    }

    // 计算累积直方图和归一化的累积直方图
    cumulative_hist[0] = histogram[0];
    cumulative_hist_norm[0] = (float)cumulative_hist[0] / (float)(width * height);
    for (i = 1; i < HISTOGRAM_SIZE; i++) {
        cumulative_hist[i] = cumulative_hist[i-1] + histogram[i];
        cumulative_hist_norm[i] = (float)cumulative_hist[i] / (float)(width * height);
    }

    // 应用直方图均衡化
    image_out = (unsigned char*)malloc(sizeof(unsigned char) * width * height);
    for (i = 0; i < width * height; i++) {
        pixel = image_in[i];
        image_out[i] = (unsigned char)(MAX_PIXEL_VALUE * cumulative_hist_norm[pixel] + 0.5);
    }

    // 保存输出图像
    FILE *file_out = fopen("output_image.pgm", "wb");
    fprintf(file_out, "P5\n%d %d\n%d\n", width, height, MAX_PIXEL_VALUE);
    fwrite(image_out, sizeof(unsigned char), width * height, file_out);
    fclose(file_out);

    // 释放内存
    free(image_in);
    free(image_out);

    return 0;
}

注意：该代码仅适用于 PGM 格式的灰度图像。如果你使用其他格式或彩色图像，需要做出相应的修改。