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Next, the Euclidean distance between all images is computed and each image is now represented by its dissimilarity to the other images. A pseudo-Fisher linear discriminant was built on this dissimilarity space. The performance of discrete Fourier transform (DFT) descriptors and a combination of both feature types was also evaluated. The algorithms were tested on a 40- and 1196-subjects face database (ORL and FERET, respectively). With five images per subject in the training and test datasets, error rate on the ORL database was 3.8, 1.25, and 0.2% for the FBT, DFT, and the combined classifier, respectively, as compared to 2.6% achieved by the best previous algorithm. The most informative polar frequency features were concentrated at low-to-medium angular frequencies coupled to low radial frequencies. On the FERET database, where an affine normalization preprocessing was applied, the FBT algorithm outperformed only the PCA in a rank recognition test. However, it achieved performance comparable to state-of-the-art methods when evaluated by verification tests. These results indicate the high informative value of the polar frequency content of face images in relation to recognition and verification tasks and that the Cartesian frequency content can complement information about the subjects' identity, but possibly only when the images are not prenormalized. Possible implications for human face recognition are discussed.<\/jats:p>","DOI":"10.1145\/1119766.1119771","type":"journal-article","created":{"date-parts":[[2006,5,8]],"date-time":"2006-05-08T16:09:20Z","timestamp":1147104560000},"page":"62-82","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":16,"title":["Face recognition based on polar frequency features"],"prefix":"10.1145","volume":"3","author":[{"given":"Yossi","family":"Zana","sequence":"first","affiliation":[{"name":"University of S\u00e3o Paulo, S\u00e3o Paulo, Brazil"}]},{"suffix":"Jr","given":"Roberto M.","family":"Cesar","sequence":"additional","affiliation":[{"name":"University of S\u00e3o Paulo, S\u00e3o Paulo, Brazil"}]}],"member":"320","published-online":{"date-parts":[[2006,1]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1162\/15324430152733133"},{"key":"e_1_2_1_2_1","doi-asserted-by":"crossref","first-page":"182","DOI":"10.1007\/3-540-44887-X_22","article-title":"A face recognition system based on local feature analysis","volume":"2688","author":"Arca A.","year":"2003","journal-title":"Lecture Notes in Computer Science"},{"key":"e_1_2_1_3_1","unstructured":"Abdi H. 1988. 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