```
// image - input image
// result - output image
// N - width of the image
// M - height of the image
void _medianfilter(const element* image, element* result, int N, int M)
{
// Move window through all elements of the image
for (int m = 1; m < M - 1; ++m)
for (int n = 1; n < N - 1; ++n)
{
// Pick up window elements
int k = 0;
element window[9];
for (int j = m - 1; j < m + 2; ++j)
for (int i = n - 1; i < n + 2; ++i)
window[k++] = image[j * N + i];
// Order elements (only half of them)
for (int j = 0; j < 5; ++j)
{
// Find position of minimum element
int min = j;
for (int l = j + 1; l < 9; ++l)
if (window[l] < window[min])
min = l;
// Put found minimum element in its place
const element temp = window[j];
window[j] = window[min];
window[min] = temp;
}
// Get result - the middle element
result[(m - 1) * (N - 2) + n - 1] = window[4];
}
}
void medianfilter(element* image, element* result, int N, int M)
{
// Check arguments
if (!image || N < 1 || M < 1)
return;
// Allocate memory for signal extension
element* extension = new element[(N + 2) * (M + 2)];
// Check memory allocation
if (!extension)
return;
// Create image extension
for (int i = 0; i < M; ++i)
{
memcpy(extension + (N + 2) * (i + 1) + 1, image + N * i, N * sizeof(element));
extension[(N + 2) * (i + 1)] = image[N * i];
extension[(N + 2) * (i + 2) - 1] = image[N * (i + 1) - 1];
}
// Fill first line of image extension
memcpy(extension, extension + N + 2, (N + 2) * sizeof(element));
// Fill last line of image extension
memcpy(extension + (N + 2) * (M + 1), extension + (N + 2) * M, (N + 2) * sizeof(element));
// Call median filter implementation
_medianfilter(extension, result ? result : image, N + 2, M + 2);
// Free memory
delete[] extension;
}
```

if anyone familiar with this bcb please lend me your hand...thank you so much!