均值滤波代码 C代码

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// 本函数是实现 3 * 3 均值滤波
//函数的的当前点的像素 = 3 * 3 范围的平均值
// @para src 输入图像数据
// @para srcW 输入图形宽
// @para srcH 输入图像的高
// @para channels 通道数 
// @para dest 输出图像 ， 输出图像的大小和输入一样
int MeanFilter(unsigned char * src, int srcW, int srcH, int channels, unsigned char * dest)
{
int i = 0;
int j = 0;
int k = 0;
int ModelWH = 3;
int halfM = ModelWH / 2;
int m = 0;
int n = 0;
if (channels > 4 || channels < 1)
{
return -1;
}
for (i = 0; i < srcH; i++)
{
for (j = 0; j < srcW; j++)
{
int sum = 0;
int temp[4] = { 0, 0, 0, 0 };
int count[4] = { 0, 0, 0, 0 };
for (n = i - halfM; n <= i + halfM; n++)
{
for (m = j - halfM; m <= j + halfM; m++)
{
for (k = 0; k < channels; k++)
{
unsigned char temp1 = 0;
if (n > 0 && n < srcH && m > 0 && m < srcW)
{
temp1 = src[(n * srcW + m) * channels + k];
count[k]++;
temp[k] += temp1;
}
}
}
}
for (k = 0; k < channels; k++)
{
dest[(i * srcW + j) * channels + k] = (unsigned char)((temp[k] * 1.0f / (count[k])+0.5f));
}
}
}
return 0;
}