Local Binary Pattern(LBP)

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C N N
C N N 2011-9-13
评论： Image Analyst 2023-7-16
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 but i am not getting it. how to correct it?
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回答（10 个）

madhulika jain
madhulika jain 2011-9-22
I think you shpuld be getting LBP in the range 0 to 255. I ran this code and i got the values in this range only
  1 个评论
C N N
C N N 2011-9-22
The problem with this code that after you get LBP, you need to convert it to uint8 before displaying it.

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Izzo
Izzo 2011-12-3
hey i think i got your problem, because i already did LBP. First, make sure that u have converted the image into grayscale form. Second, you have to replace the test image with the new LBP image, therefore: instead of this code
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;
try to change into:
I2(i-1,j-1)=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;
because i have problem like that too, then my supervisor solve into this for me :P
Image Analyst
Image Analyst 2011-9-22
Change the last few lines of your code to this:
subplot(2,2,3);
imshow(LBP, []);
subplot(2,2,4);
[pixelCounts, GLs] = imhist(uint8(LBP));
bar(GLs, pixelCounts);
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Fatemeh Shomal Zadeh
Fatemeh Shomal Zadeh 2021-2-13
Hi,
I have a cell array data of grayscale images 20x5. (20 images at 5 frames)
I want to use LBP to analyze the background scatter points of my images and see if I can find any differences between their values, as my data covers the healthy and unhealthy patients.
Is there anyone who can help me for that. I have been using this code;
features = extractLBPFeatures(images{20,1})
subplot(2,2,3);
imshow(features, []);
subplot(2,2,4);
[pixelCounts, GLs] = imhist(uint8(features));
bar(GLs, pixelCounts);
But I think it does not show me what I want. As the output is a single array. I am not very familiar with LBP, can you please hep me regarding how the output should be?
Walter Roberson
Walter Roberson 2021-2-14
But I think it does not show me what I want
We do not have your image to test with, and we do not know what kinds of output you expect to see.

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remo
remo 2011-12-1
hi CNN,
Sorry for being a Noob. I just cant understand why you use 'scale = 2.^[7 6 5; 0 -inf 4; 1 2 3]; ' in this program. can you explain?
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Muhammad Amirul Hafiz Sahful Bahri
Muhammad Amirul Hafiz Sahful Bahri 2019-3-29
hi, I would like to know how did you get those number [ 7 6 5; 0 -inf 4; 1 2 3] ?
Did you calculate it?
Image Analyst
Image Analyst 2019-3-29
Unhide the comments above and you'll see a desciption of how those are computed.

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anusha
anusha 2014-9-24
编辑：DGM 2023-2-11
u can try this code
clear all;
close all;
I=imread('cameraman.tif');
I=rgb2gray(I);
I1=imcrop(I);
[w h]=size(I1);
for i=2:w-1
for j=2:h-1
val=I1(i,j);
scale=2.^[0 1 2;7 -inf 3;6 5 4];
mat=[I1(i-1,j-1) I1(i-1,j) I1(i-1,j+1);
I1(i,j-1) I1(i,j) I1(i,j+1);
I1(i+1,j-1) I1(i+1,j) I1(i+1,j+1)];
mat=mat>=val;
fin=mat.*scale;
I1(i,j)=sum(sum(fin));
end
end
imshow(I1,[]);
Nikolay S.
Nikolay S. 2015-3-16
You can try one of the following LBP implementations: http://www.mathworks.com/matlabcentral/fileexchange/49787-shift-based-lbp http://www.mathworks.com/matlabcentral/fileexchange/36484-local-binary-patterns I'm using both for a while, updating them fomr time to time.
Ktk
Ktk 2017-10-29
the code is not giving me any values. can anyone help? thanks!
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Image Analyst
Image Analyst 2022-6-1
@SATISH SONWANE, isn't that the usual way? You can change it if you want. Why would you want to?

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Vrushali Patil
Vrushali Patil 2020-4-2
Can anyone please help me to apply lbp on image frames directly without croping the image?
  1 个评论
Image Analyst
Image Analyst 2020-4-2
Who said you had to crop the image? Just go ahead and do it on your image without cropping it if you don't want to crop it. What's the problem?

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Image Analyst
Image Analyst 2020-4-2
See my attached LBP demo.
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PAVITHRA
PAVITHRA 2023-2-22
If i run this demo code for brain tumor image,the lbp image becomes red color why?
Image Analyst
Image Analyst 2023-2-22
@PAVITHRA I have no idea what your code does. When anyone runs my code, this is what they'll see:
If you want me to look at your code, start a new question and attach your code and image.

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Dehia
Dehia 2023-7-15
Is it normal to have a large number of zeros and a few non-zero values in the LBP feature array?
  1 个评论
Image Analyst
Image Analyst 2023-7-16
For 3x3 submatrices where all the values are the same, you'd get zero. This can happen fairly often.

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