请给出C语言实现直方图均衡化来增强图像对比度的算法代码
时间: 2023-08-21 18:02:57 浏览: 142
当然,以下是一个简单的C语言实现直方图均衡化的算法代码:
```c
#include <stdio.h>
#include <stdlib.h>
#define MAX_PIXEL_VALUE 255
// 计算图像的直方图
void calculateHistogram(int *histogram, unsigned char *image, int width, int height) {
for (int i = 0; i < width * height; i++) {
histogram[image[i]]++;
}
}
// 计算直方图均衡化后的映射表
void calculateEqualizationMap(int *histogram, int *equalizationMap, int numPixels) {
int cumulativeSum = 0;
float scaleFactor = (float) MAX_PIXEL_VALUE / numPixels;
for (int i = 0; i <= MAX_PIXEL_VALUE; i++) {
cumulativeSum += histogram[i];
equalizationMap[i] = (int) (cumulativeSum * scaleFactor);
}
}
// 应用直方图均衡化到图像
void applyHistogramEqualization(unsigned char *image, int *equalizationMap, int width, int height) {
for (int i = 0; i < width * height; i++) {
image[i] = equalizationMap[image[i]];
}
}
int main() {
int width = 512;
int height = 512;
int numPixels = width * height;
unsigned char *image = (unsigned char *) malloc(numPixels * sizeof(unsigned char));
int *histogram = (int *) calloc(MAX_PIXEL_VALUE + 1, sizeof(int));
int *equalizationMap = (int *) malloc((MAX_PIXEL_VALUE + 1) * sizeof(int));
// 加载图像数据,这里假设图像已经加载到image数组中
// 计算直方图
calculateHistogram(histogram, image, width, height);
// 计算直方图均衡化映射表
calculateEqualizationMap(histogram, equalizationMap, numPixels);
// 应用直方图均衡化
applyHistogramEqualization(image, equalizationMap, width, height);
// 保存均衡化后的图像数据,可以进行后续处理或显示
free(image);
free(histogram);
free(equalizationMap);
return 0;
}
```
请注意,这只是一个简单的直方图均衡化算法实现示例。实际应用中,可能需要对输入图像进行预处理和后处理,以及对算法进行优化等。
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