Fig. 4
The sobel mask for four kinds of direction a is horizontal mask (mx); b is vertical mask (my); c is 45∘ mask (mxy); d is 135∘ mask (myx)
Fig. 4 | EURASIP Journal on Image and Video Processing
The sobel mask for four kinds of direction a is horizontal mask (mx); b is vertical mask (my); c is 45∘ mask (mxy); d is 135∘ mask (myx)