32位RGB图像中值滤波

来源：互联网发布：中国不高兴知乎编辑：程序博客网时间：2024/06/09 14:24

中值滤波对椒盐噪声有很好的滤出效果，下面以3x3滤波器为例，实现中值滤波。

排序，采用选择排序。

void Sort(int data[9]){int i;int j;int minv;int index;index = 0;for (i = 0; i < 9; i++){   minv = data[i];index = i;for (j = i+1; j < 9; j++){if (minv > data[j]) { minv = data[j]; index = j; }}data[index] = data[i];data[i] = minv;}}

中值滤波：

void RGB32MedianFilting(uint8_t* src, uint8_t* dst, int width, int height){int i,j;int m,n;int d;uint32_t row_bytes;uint32_t color;int r_data[9];int g_data[9];int b_data[9];uint32_t* img;uint32_t* ptr;uint32_t* dimg;uint32_t  off;row_bytes = width * 4;off = row_bytes + 4;for (i = 1; i < height - 1; i++){   img = (uint32_t*)(src + off);dimg = (uint32_t*)(dst + off);for (j = 1; j < width - 1; j++){  ptr = img;d = 0;for (m = -1; m <= 1; m++){   ptr = img + m * width;for (n = -1; n <= 1; n++){  ptr += n;color = *ptr;r_data[d] = color & 0x000000FF;g_data[d] = (color >> 8) & 0x000000FF;b_data[d] = (color >> 16) & 0x000000FF;d++;}}Sort(r_data);Sort(g_data);Sort(b_data);color &= 0xFF000000;color |= r_data[4] + (g_data[4] << 8) + (b_data[4] << 16);*dimg = color;dimg++;img++;}off += row_bytes;}}

要拓展到5x5,7x7等，也很容易。另外，对边界采取忽略的处理方式。

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