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View Code? Open in Web Editor NEWImage Classification using Bag of Words and Spatial Pyramid BoW
Image Classification using Bag of Words and Spatial Pyramid BoW
======================================================================== Image Classification using Bag of Words and Spatial Pyramid BoW Created by Piji Li Email: [email protected] Blog: http://www.zhizhihu.com Weibo: http://www.weibo.com/pagecn 10/24/2011 Some code are from: S. Lazebnik, C. Schmid, and J. Ponce, "Beyond Bags of Features: Spatial Pyramid Matching for Recognizing Natural Scene Categories," CVPR 2006. ======================================================================== Use: 1, follow labes/readme to prepare data 2, go to libsvm/: make 3, modify ini.m: rootpath=your demo path, and then run main.m. The BOW and Dictionary is in the dir:/data/global, size of BOW_sift.mat is (DictionarySize * #images). Size of dictionary.mat is (DictionarySize * dim of features).spatial_pyramid.mat is the Spatial Pyramid BoW. In /data/local is the sift features for each images. ======================================================================== Classification using BOW rbf_svm Accuracy = 76.6667% (92/120) (classification) Classification using histogram intersection kernel svm Accuracy = 81.6667% (98/120) (classification) Classification using Pyramid BOW rbf_svm Accuracy = 82.5% (99/120) (classification) Classification using Pyramid BOW histogram intersection kernel svm Accuracy = 90% (108/120) (classification) ======================================================================== Idea from: S. Lazebnik, C. Schmid, and J. Ponce, "Beyond Bags of Features: Spatial Pyramid Matching for Recognizing Natural Scene Categories," CVPR 2006. Images from: Li, Piji, and Jun Ma. "What is happening in a still picture?." In The First Asian Conference on Pattern Recognition, pp. 32-36. IEEE, 2011. Piji Li, Jun Ma, Shuai Gao. Actions in Still Web Images: Visualization, Detection and Retrieval. The 12th International Conference on Web-Age InformationManagement (WAIM 2011). Springer, 2011. SVM from: Chih-Chung Chang and Chih-Jen Lin, LIBSVM : a library for support vector machines. ACM Transactions on Intelligent Systems and Technology, 2:27:1--27:27, 2011. Software available at http://www.csie.ntu.edu.tw/~cjlin/libsvm
is it possible to identify the images that are wrongly classified in your code?
please reply.
CalculateDictionary.m stops at line 31 and gives error:
unable to load file PG_BOW_DEMO\data\local\00000001\sift_features'. No such file or directory.
would you help, at which step sift_features are supposed to be created?
any solution to correct?
When I run the main function, the error below is found.
Error using svmtrain (line 233)
Y must be a vector or a character array.
Error in do_classification_rbf_svm (line 38)
model=svmtrain(train_labels, train_data, options);
Error in main (line 51)
do_classification_rbf_svm
Any solutions to correct this?
Please rebuild(mex) libsvm.
Number of columns on line 2 of ASCII file D:\project-major\PG_BOW_DEMO-master\data\local\00000001\sift_features must be the
same as previous lines.
Error in CalculateDictionary (line 31)
load(inFName, 'features')
Error in main (line 31)
CalculateDictionary(pg_opts, dictionary_opts);
how to correct this error?
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