2dArray FilterImage(2dArray image, 2dArray filter_mask,
int image_width, int image_height, int filter_width, int filter_height) {
int a= (filter_width-1)/2;
image Output;
spiegele filter_mask;
//first 2 for picture
for(int j=a;j<image_heighth;j++){

for(int i=a;i<image_width;i++){
//last 2 for filter_mask

for(l=0;l<filter_heigth;l++){
for(k=0;k<filter_width;k++){

Output[j][i]=output[j][i]+(filter[l][k]*image[j-a+l][i-a+k]);
}}}}}