{
  "box_3x3": [1,1,1,1,1,1,1,1,1],
  "gauss_3x3": [1,2,1,2,4,2,1,2,1],
  "sharpen_3x3": [0,-1,0,-1,5,-1,0,-1,0],
  "edge_3x3": [0,1,0,1,-4,1,0,1,0]
}