MATLAB中的局部二值模式 [英] Local Binary Pattern in MATLAB

问题描述

我正在尝试使用图像处理工具箱在MATLAB中执行本地二进制模式。当我执行时，我无法获得LBP图像和LBP直方图。

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)

问题是什么。我应该从0到255获取数字。

what is the issue.i am supposed to get numbers from 0 to 255.

推荐答案

I3（i-1，j-1） = I2（i-1，j-1）> J0; 创建逻辑输出。如果你不把它转换成别的东西，你的图像只会是0和1。

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.

最简单的方法是初始化 I3 在循环之外，即在开始循环之前有 I3 = I2; 。这样，循环中的所有赋值都会转换为 I2 的类。

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.

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