算术平均值滤波C语言代码

算术平均值滤波是一种常见的图像处理技术，它通过对邻域像素值进行加权平均来平滑图像，去除噪声。以下是使用C语言实现一个简单的3x3算术平均值滤波的示例：

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

#define FILTER_SIZE 3

// 计算3x3矩阵的算术平均值
float calculate_average(int pixel[9]) {
    float sum = 0;
    for (int i = 0; i < FILTER_SIZE * FILTER_SIZE; i++) {
        sum += pixel[i];
    }
    return sum / FILTER_SIZE / FILTER_SIZE;
}

void arithmetic_mean_filter(unsigned char* image, int width, int height) {
    int kernel[FILTER_SIZE][FILTER_SIZE] = { {1, 1, 1}, {1, 1, 1}, {1, 1, 1} }; // 初始化权重
    for (int y = FILTER_SIZE / 2; y < height - FILTER_SIZE / 2; y++) { // 避免边界效应
        for (int x = FILTER_SIZE / 2; x < width - FILTER_SIZE / 2; x++) {
            int pixel[9] = {image[y * width + x], image[(y - 1) * width + x], image[(y - 1) * width + x + 1],
                            image[y * width + x - 1], image[y * width + x], image[(y - 1) * width + x - 1],
                            image[y * width + x + 1], image[(y - 1) * width + x + 1], image[y * width + x]};
            image[y * width + x] = (unsigned char)calculate_average(pixel);
        }
    }
}

int main() {
    // 假设你有一个宽度和高度已知的图像数组image
    // 先填充图像数据并设置起始位置
    // arithmetic_mean_filter(image, width, height);

    printf("Average filtered image data...\n");
    return 0;
}