Lab_09

Extraction of Local Binary Patterns from an Image

Date: 08.04.2021

Files:

• lbp.m: MatLab function to extract bin-specific LBP features for a given image
• q1.m: MatLab Driver code to implement LBP function

Output:

Developer Notes:

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Converter Algorithm Explanation

Distance = 1 implies Converter Dimension: 3x3

	1	2	3
1	1	2	3
2	8	0	4
3	7	6	5

Distance = 2 implies Converter Dimension: 5x5

	1	2	3	4	5
1	1	2	3	4	5
2	16	0	0	0	6
3	15	0	0	0	7
4	14	0	0	0	8
5	13	12	11	10	9

Let's say, distance = 2 implies, convertor_dimension = 5 x 5 implies, convertor_dimension = (2*distance + 1) x (2*distance + 1) implies, convertor_size = 2*distance + 1

For i = 1:5 viz. i = 1:cnv_size For top, cell(1, i) = i For bottom, i = 1 gives

$$13 = 2*4 + 5 - i + 1 = 2*(5-1) + 5 - i + 1$$

cell(5, i) = (2*(cnv_size-1) + cnv_size - i + 1)

For i = 2:4 viz. i = 2:cnv_size-1 For right, i = 2 gives

$$6 = 5 + 2 - 1 = 5 + i - 1$$

cell(i, 5) = cnv_size + i - 1 For left, i = 3 gives

$$15 = 16 - 1 = 16 - 3 + 2 = 8*distance - i + 2$$

cell(i, 5) = 8*distance - i + 2

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