Svm+hog Classification of images (MATLAB implementation)

Source: Internet
Author: User
Tags svm

Online see about using OPENCV to classify the image, this time with Matlab to do some attempts, the image data set is: Link: Password: utn7, other MATLAB version/HTTP, click the Open link, 53763484 additional OPENCV versions for: Click to open the link,

Nonsense not to say, directly on the code (for MATLAB 2016b version and above), the code has a corresponding comment.

The image I trained on disk has the following 5 categories, eliminating the previous process of making txt storage image paths:

The test image is distributed as:

Percent percent with hog feature for multi-classification of images, SVM training, 1 VS 1   percent 1 datasets, including training and testing (note your own picture storage path, appendix I to show example download Image link)   Imdstrain = Imagedatastore (' f:\ Svm_images\train_images ',...       ' includesubfolders ', true,...       ' labelsource ', ' Foldernames ');   Imdstest = Imagedatastore (' F:\svm_images\test_image ');
  percent display the training of the picture type labels and the number of count Train_disp = Counteachlabel (Imdstrain);
   percent   2 hog feature extraction for each image in the training set, the same as the test image  % preprocessing image, mainly to get features feature size, which is related to image size and hog characteristic parameters   ImageSize = [256,256];% scales all images to this size   Image1 = Readimage (imdstrain,1);   Scaleimage = imresize (image1,imagesize);   [Features, visualization] = Extracthogfeatures (scaleimage);   Imshow (scaleimage); Plot (visualization)     % feature extraction for all training images   Numimages = length (imdstrain.files);   Featurestrain = zeros (Numimages,size (features,2), ' single '); % Featurestrain for single precision   for i = 1:numimages       Imagetrain = ReadimAge (Imdstrain,i);       Imagetrain = Imresize (imagetrain,imagesize); 
      Featurestrain (i,:) = Extracthogfeatures (imagetrain);   End     % All training image tags   Trainlabels = Imdstrain.labels;     % start SVM Multi-classification training, note: FITCSVM for two classification, FITCECOC for Multi-classification, 1 VS 1 method   Classifer = Fitcecoc (Featurestrain, Trainlabels);      percent forecast and display forecast renderings   numtest = length (imdstest.files);   For i = 1:numtest       testimage = Readimage (imdstest,i);       Scaletestimage = Imresize (testimage,imagesize);       featuretest = Extracthogfeatures (scaletestimage);       [predictindex,score] = predict (classifer,featuretest);       Figure;imshow (testimage);       title ([' Predictimage: ', char (Predictindex)]);

Command line pair Training set Imdstrain
The results of the statistical output are as follows:

The first image shows the extracted hog features, this can be a primary understanding of the characteristics of the selection of the appropriate, not suitable to adjust the parameters inside the extracthogfeatures, such as Cellsize,blocksize,bins, Specifically, you can refer to this click to open the link Extracthogfeatures&s_tid=doc_srchtitle. The default parameters of the program selection, from Figure 1 can be previewed to the characteristics of each appropriate.

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