写一个局部直方图均衡化的C语言代码
时间: 2023-05-25 11:03:01 浏览: 51
由于缺乏背景和数据集,我们无法准确编写该代码。但下面是一个可能的实现。
```c
#include <stdio.h>
#include <stdlib.h>
#define WIDTH 256 // 灰度级数
#define BLOCK_SIZE 32 // 块大小
int clip(int x, int min_val, int max_val) {
if (x < min_val)
return min_val;
else if (x > max_val)
return max_val;
else
return x;
}
void local_histogram_equalization(unsigned char *image, int width, int height) {
int blocks_x = width / BLOCK_SIZE;
int blocks_y = height / BLOCK_SIZE;
int block_histogram[WIDTH];
int block_sum;
int pixel_sum;
// 处理每个块
for (int by = 0; by < blocks_y; by++) {
for (int bx = 0; bx < blocks_x; bx++) {
// 计算当前块的直方图
for (int i = 0; i < WIDTH; i++) {
block_histogram[i] = 0;
}
for (int y = by * BLOCK_SIZE; y < (by + 1) * BLOCK_SIZE; y++) {
for (int x = bx * BLOCK_SIZE; x < (bx + 1) * BLOCK_SIZE; x++) {
int pixel = image[y * width + x];
block_histogram[pixel]++;
}
}
// 计算当前块的累积直方图,并且均衡化像素值
block_sum = 0;
for (int i = 0; i < WIDTH; i++) {
block_sum += block_histogram[i];
block_histogram[i] = block_sum * WIDTH / BLOCK_SIZE / BLOCK_SIZE;
}
// 均衡化像素值
pixel_sum = 0;
for (int y = by * BLOCK_SIZE; y < (by + 1) * BLOCK_SIZE; y++) {
for (int x = bx * BLOCK_SIZE; x < (bx + 1) * BLOCK_SIZE; x++) {
int pixel = image[y * width + x];
int new_pixel = clip(block_histogram[pixel], 0, WIDTH - 1);
image[y * width + x] = new_pixel;
pixel_sum += pixel;
}
}
// 统计在两次处理中像素值有变化的像素数
int num_changed_pixels = 0;
for (int y = by * BLOCK_SIZE; y < (by + 1) * BLOCK_SIZE; y++) {
for (int x = bx * BLOCK_SIZE; x < (bx + 1) * BLOCK_SIZE; x++) {
if (image[y * width + x] != pixel_sum / BLOCK_SIZE / BLOCK_SIZE) {
num_changed_pixels++;
}
}
}
// 如果变化的像素数超过阈值(10%),则重新处理当前块
if (num_changed_pixels > (int)(BLOCK_SIZE * BLOCK_SIZE * 0.1)) {
bx--;
if (bx < 0) {
bx = 0;
by--;
}
}
}
}
}
int main() {
// 加载图像到内存中,忽略细节
unsigned char *image = load_image("image.png");
int width = get_image_width();
int height = get_image_height();
// 局部直方图均衡化处理
local_histogram_equalization(image, width, height);
// 保存图像,忽略细节
save_image("result.png", image, width, height);
free(image);
return 0;
}
```
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