blur filter png photo code example

Example: blur filter

#define filterWidth 3
#define filterHeight 3

double filter[filterHeight][filterWidth] =
{
   0.0, 0.2,  0.0,
   0.2, 0.2,  0.2,
   0.0, 0.2,  0.0
};

double factor = 1.0;
double bias = 0.0;