Convolution Filter

In image processing, convolution matrix, or mask is a small matrix. It is used for blurring, sharpening, embossing, edge detection, and more.

Original image

Identity filter

Kernel:

0	0	0
0	1	0
0	0	0

Edge detection filter

Kernel:

0	1	0
1	-4	1
0	1	0

Sharpen filter

Kernel:

0	0	0	0	0
0	0	5	0	0
0	-1	5	-1	0
0	0	1	0	0
0	0	0	0	0

Box blur filter

Normalization rate = 16

Kernel:

1	2	1
2	4	2
1	2	1

Gaussian blur filter

Normalization rate = 256

Kernel:

1	4	6	4	1
4	16	24	16	4
6	24	36	24	6
4	16	24	16	4
1	4	6	4	1

Motion blur filter

Normalization rate = 9

Kernel:

1	0	0	0	0	0	0	0	0
0	1	0	0	0	0	0	0	0
0	0	1	0	0	0	0	0	0
0	0	0	1	0	0	0	0	0
0	0	0	0	1	0	0	0	0
0	0	0	0	0	1	0	0	0
0	0	0	0	0	0	1	0	0
0	0	0	0	0	0	0	1	0
0	0	0	0	0	0	0	0	1

Emboss(Relief) filter

Kernel:

-2	-1	0
-1	1	1
0	1	2

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