使用LBP實現動物分類：matlab版本

1.訓練集測試集劃分（同上一篇）

2.代碼部分

1）訓練部分代碼：training.m

%% 該函數是使用LBP來提取test_images下圖片的特徵的，代碼編寫參考matlab官方文檔 

%% 1.獲取圖片以及相關的分類

currentPath = pwd;  % 得到當前的工做目錄

imdsTrain = imageDatastore(fullfile(pwd,'train_images'),...  
    'IncludeSubfolders',true,...  
    'LabelSource','foldernames');   % 載入圖片集合

%%   2 對訓練集中的每張圖像進行hog特徵提取，測試圖像同樣  
% 預處理圖像,主要是獲得features特徵大小，此大小與圖像大小和Hog特徵參數相關  
imageSize = [256,256];% 對全部圖像進行此尺寸的縮放  
I = readimage(imdsTrain,1);
I = imresize(I,imageSize);  
I = rgb2gray(I);
lbpFeatures = extractLBPFeatures(I,'CellSize',[16 16],'Normalization','None');
numNeighbors = 8;
% Upright = false;
numBins = numNeighbors*(numNeighbors-1)+3; % numNeighbors+2;
lbpCellHists = reshape(lbpFeatures,numBins,[]);
lbpCellHists = bsxfun(@rdivide,lbpCellHists,sum(lbpCellHists));
lbpFeatures = reshape(lbpCellHists,1,[]);

% 提示信息
disp('開始訓練數據...');
% 對全部訓練圖像進行特徵提取  
numImages = length(imdsTrain.Files);  
featuresTrain = zeros(numImages,size(lbpFeatures,2),'single'); % featuresTrain爲單精度  
for i = 1:numImages  
    imageTrain = readimage(imdsTrain,i);  
    imageTrain = imresize(imageTrain,imageSize);  
    
    I = rgb2gray(imageTrain);
    lbpFeatures = extractLBPFeatures(I,'CellSize',[16 16],'Normalization','None');
%     numNeighbors = 8;
%     numBins = numNeighbors*(numNeighbors-1)+3;
    lbpCellHists = reshape(lbpFeatures,numBins,[]);
    lbpCellHists = bsxfun(@rdivide,lbpCellHists,sum(lbpCellHists));
    lbpFeatures = reshape(lbpCellHists,1,[]);
    
    featuresTrain(i,:) = lbpFeatures;  
end  
  
% 全部訓練圖像標籤  
trainLabels = imdsTrain.Labels;  
  
% 開始svm多分類訓練，注意：fitcsvm用於二分類，fitcecoc用於多分類,1 VS 1方法  
classifer = fitcecoc(featuresTrain,trainLabels);  

save classifer
% 提示信息
disp('訓練階段結束！！！');

　　

2）測試部分代碼：classify.m

%% 該函數用來對圖片進項分類 LBP + SVM

%% 1.讀入待分類的圖片集合
currentPath = pwd;
imdsTest = imageDatastore(fullfile(pwd,'test_image')); 

%% 2.分類，預測並顯示預測效果圖  
% 載入分類器
load classifer

correctCount = 0;
%% 預測並顯示預測效果圖  
numTest = length(imdsTest.Files);  
for i = 1:numTest  
    testImage = readimage(imdsTest,i);  %  imdsTest.readimage(1)
    scaleTestImage = imresize(testImage,imageSize);  
    
    I = rgb2gray(scaleTestImage);
    lbpFeatures = extractLBPFeatures(I,'CellSize',[16 16],'Normalization','None');
    numNeighbors = 8;
    numBins = numNeighbors*(numNeighbors-1)+3;
    lbpCellHists = reshape(lbpFeatures,numBins,[]);
    lbpCellHists = bsxfun(@rdivide,lbpCellHists,sum(lbpCellHists));
    featureTest = reshape(lbpCellHists,1,[]);
     
    [predictIndex,score] = predict(classifer,featureTest);  
    figure;imshow(imresize(testImage,[256,256]));
    
    imgName = imdsTest.Files(i);
    tt = regexp(imgName,'\','split');
    cellLength =  cellfun('length',tt);
    tt2 = char(tt{1}(1,cellLength));
     % 統計正確率
    if strfind(tt2,char(predictIndex))==1
        correctCount = correctCount+1;
    end
    title(['分類結果: ',tt2,'--',char(predictIndex)]);  
    fprintf('%s == %s \n',tt2,char(predictIndex));
end  

% 顯示正確率
fprintf('分類結束，正確了爲：%.1f%%\n',correctCount * 100.0 / numTest);