Can anyone state what is the reason for ambiguity (considering the clockwise direction starting from top left corner in 8 neighbor surrounding pixel for uniform LBP).

Input Matrix ==>

    90   101    67
   118    83    44
   196   105    48

After using the inbuilt LBP feature extractor in MATLAB i.e. extractLBPFeatures(matrix_name) (Inbuilt is uniform local binary pattern.) The value returned is:

Columns 1 through 16

         0         0         0         0         0         0         0         0         0         0         0         0         0         0         0         0

Columns 17 through 32

         0         0         0         0         0         0         0         0         0         0         0         0         0         0         0         0

Columns 33 through 48

         0         0         0         0         0         0         0         0         0         0         0         0         0         0         0         0

Columns 49 through 59

         0         0         0         0         0         0         0         0         0    1.0000         0

But, my algorithm of uniform local binary pattern gives this histogram:

Columns 1 through 16 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Columns 17 through 32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Columns 33 through 48 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 Columns 49 through 59 0 0 0 0 0 0 0 0 0 0 0

Explanation of algorithm:

 1)

    90   101    67
   118    83    44
   196   105    48

+++++++++++++++++ 2)

     1     1     0
     1     X     0
     1     1     0

+++++++++++++++++ 3)

from top left corner : clockwise direction we get 8 bit binary pattern as 11000111 (base 2) = 191 (base 10). Thus, 1 is added to 199 pixel i.e. 40th uniform pattern. So, 40th column is 1 whereas, inbuilt function produced 58th column to be 1 which is indicating 255 pixel.

     0     0     0
     0   199     0
     0     0     0

+++++++++++++++++

[Image Analyst]

I don't have that function. What toolbox is it in (List it in the products section to the left)? Why do you get 59 columns instead of a single 8 bit binary number which gets converted into a single decimal number?

Answer 1

[Image Analyst]

See attached demo. You can see that the pattern changes but not dramatically as the LSB is rotated.