Digital Image Processing
Basic effects

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Frequencial modification

Low pass filter
Simple 3*3 mask that blur the picture.
Blurring apear beacause of erasing high frequency of the image.

K=9
M=
1 1 1
1 1 1
1 1 1
Pixel=k*Σ(M(0,0)..M(3,3))

Languages : C & MatLab

Hight pass filter
Simple 3*3 mask that sharp the picture.
Sharping apear beacause of erasing low frequency of the image.

K=9
M=
-1 -1 -1
-1 4 -1
-1 -1 -1
Pixel=k*Σ(M(0,0)..M(3,3))

Languages : C & MatLab

Edge detection

Prewitt
Edge detection

K=9
M=
-2 -1 0
-1 0 1
0 1 2
Pixel=k*Σ(M(0,0)..M(3,3))

Languages : C & MatLab

Sobel
Edge detection

K=9
M=
-2 -2 0
-2 0 2
0 2 2
Pixel=k*Σ(M(0,0)..M(3,3))

Languages : C & MatLab

Laplacian
Edge detection

K=9
M=
0 1 0
1 -4 1
0 1 0
Pixel=k*Σ(M(0,0)..M(3,3))

Languages : C & MatLab