CODEWITHSUNDEEP
matlabimage-processing
cnn lakshmen
cnn lakshmen

Reputation: 115

Local Binary Pattern in MATLAB

I am trying to execute local binary pattern in MATLAB using the image processing toolbox. When i execute I can't get a LBP image and LBP histogram. 

   clear all;
    close all;
    clc;
    I=imread('test.png');
    figure,imshow(I)
    %% Crop
    I2 = imcrop(I);
    figure, imshow(I2)
    w=size(I2,1);
    h=size(I2,2);
    %% LBP
    scale = 2.^[7 6 5; 0 -inf 4; 1 2 3]; 
    for i=2:w-1
        for j=2:h-1
            J0=I2(i,j);
            I3(i-1,j-1)=I2(i-1,j-1)>J0;
            I3(i-1,j)=I2(i-1,j)>J0;
            I3(i-1,j+1)=I2(i-1,j+1)>J0; 
            I3(i,j+1)=I2(i,j+1)>J0;
            I3(i+1,j+1)=I2(i+1,j+1)>J0; 
            I3(i+1,j)=I2(i+1,j)>J0; 
            I3(i+1,j-1)=I2(i+1,j-1)>J0; 
            I3(i,j-1)=I2(i,j-1)>J0;
            LBP(i,j)=I3(i-1,j-1)*2^7+I3(i-1,j)*2^6+I3(i-1,j+1)*2^5+I3(i,j+1)*2^4+I3(i+1,j+1)*2^3+I3(i+1,j)*2^2+I3(i+1,j-1)*2^1+I3(i,j-1)*2^0;

        end
    end
    figure,imshow(LBP)
    figure,imhist(LBP)

what is the issue.i am supposed to get numbers from 0 to 255.enter image description here

Upvotes: 3

Views: 5846

Answers (2)

Diljeet
Diljeet

Reputation: 1

use : figure,imshow(uint8(LBP));

Its becuase LBP image is in DOUBLE, you need to cast it.

Upvotes: 0

Jonas
Jonas

Reputation: 74940

I3(i-1,j-1)=I2(i-1,j-1)>J0; creates a logical as output. If you don't go and cast this to something else, you're image will only be zeros and ones.

The easiest way is to initialize I3 outside the loop, i.e. have I3=I2; before you start looping. This way, all your assignments inside the loop get converted to whatever class I2 was.

Upvotes: 2

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