Answers for "filter blur background image"

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;

css blur background image only

// best workaround is two images layered... (one on left is on top)
background-image: url(opaque_blurred.png), url(regular_bakground_img.jpg);
// BAM! that right there is worth at least a buck donation ;-)