Классификация методов распознавания лиц.

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Information about Классификация методов распознавания лиц.
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Published on December 21, 2008

Author: mieunix

Source: authorstream.com

????????????? ??????? ????????????? ??? : ????????????? ??????? ????????????? ??? ????? ????????? ????????????? ??? : ????? ????????? ????????????? ??? ????????? ???? ?? ?????? ??????????? ????????????? ????????? ???????? ????????????? ?????????? ??????????????, ??????? ?? ????????? ??????????????? ?????? ????? ????????????? : ????????????? ?????????????? ?????? ? 256 ???????? ?????? ??????????????? ???????????? ??????????? ??????? ????????????? ??????? ???? ???????, ????? ???? ???? ??????????? ??????????????? ? ??. ????????? ???????? ????????????? : ????????? ???????? ????????????? ????????? ?????????????? ???? ??????? ?????????? ??????????? ?????????? ??????? ??????? ????????????? : ????????????? ?????????? ??????? ?????????? (?????????, ???????????? ? ??.) ????????? ???? (???????????? ??????????, ?????????-???????? ???? ? ??.) Holistic methods : Holistic methods Holistic methods : Holistic methods Eigenfaces Fisherfaces/subspace LDA ????? ??????????? ????????? (ICA) ????? ??????? ???????? (SVM) Eigenfaces (Turk, Pentland, 91) -1 : Eigenfaces (Turk, Pentland, 91) -1 Use Principle Component Analysis (PCA) to reduce the dimsionality Eigenfaces : Eigenfaces Modeling Given a collection of n labeled training images, Compute mean image and covariance matrix. Compute k Eigenvectors (note that these are images) of covariance matrix corresponding to k largest Eigenvalues. Project the training images to the k-dimensional Eigenspace. Recognition Given a test image, project to Eigenspace. Perform classification to the projected training images. Difficulties with PCA : Difficulties with PCA Projection may suppress important detail smallest variance directions may not be unimportant Method does not take discriminative task into account typically, we wish to compute features that allow good discrimination not the same as largest variance Fisherfaces: Class specific linear projection : Fisherfaces: Class specific linear projection An n-pixel image x?Rn can be projected to a low-dimensional feature space y?Rm by y = Wx where W is an n by m matrix. Recognition is performed using nearest neighbor in Rm. How do we choose a good W? PCA & Fisher’s Linear Discriminant : PCA & Fisher’s Linear Discriminant Between-class scatter Within-class scatter Total scatter Where c is the number of classes ?i is the mean of class ?i | ?i | is number of samples of ?i.. PCA & Fisher’s Linear Discriminant : PCA & Fisher’s Linear Discriminant PCA (Eigenfaces) Maximizes projected total scatter Fisher’s Linear Discriminant Maximizes ratio of projected between-class to projected within-class scatter ?1 ?2 Eigenfaces and Fisherfaces : Eigenfaces and Fisherfaces Feature-based methods : Feature-based methods Feature-based methods : Feature-based methods ?????? ?????????????? ????????????? ???? ?????????-???????? ???? ?????????? ????????? ???? ?????? ?????????????? ????????????? ???? : ?????? ?????????????? ????????????? ???? ???? ??? ??????????? ? ????????? ?????? ???????? ????? (??? ????????) ???? ? ??????????? ????????? ?????? ?????????. ?????? ??????? ???????? ???? ??????????? ????? ????????? ???????, ???? ?????????? ????? ??????????. ?????????-???????? ????????? ???? : ?????????-???????? ????????? ???? 1-?? ???? ????? ?????????-???????? ????????????? ???????: s – ?????????????????? ??????????, ??????????????? ?????? ??????? (?????? ????????), S – ?????????? ????? ??????? ? ??????? ????????: 2-?? ???? ????? ???????? ????????????? ???????, ? ????????? ?????? ???? ????????????? – ???????????? ???????? ?? ???????. ?????????-???????? ????????? ???? : ?????????-???????? ????????? ???? ?????????-???????? ????????? ???? : ?????????-???????? ????????? ???? ??????? ????????: ?????? ???? ???????? ????????? ????????????? ?????? ?????????. ??? ???? ?????????????? ?????? ????????? (?????????????? ??? ???????). ?????? ???? ?????? ???????????? ??????? ??????, ??????????? ????? ?????? ????, ?? ???????. ?????????? ?? ????????? ????????? ??????? ???????? (???????? ? ????????). ??? ??????????? ??? ?????????? ????????, ??? ?????????? ????????? ??????????????? ?????? Hybrid methods : Hybrid methods ?????? ????????? ?????? Modular eigenfaces ?????? ????????? ?????? : ?????? ????????? ?????? Modular eigenfaces : Modular eigenfaces ? ?????? ?????? PCA ??????????? ?? ?????? ??? ????? ???????????, ?? ? ??? ???????? ???? Modular eigenfaces : Modular eigenfaces ???????? ????? Eigenfaces Modular eigenfaces Challenges: Image Variability : Challenges: Image Variability Expression Illumination Pose Short Term ?????????? : ?????????? W.Zhao, R.Chellappa, P.J.Phillips, A.Rosenfeld “Face Recognition: A Literature Survey” Bow S.-T. “Pattern Recognition and Image Preprocessing” ?????? ?.?. “????????? ????????????? ???????? ?? ???????????? ?? ?????? ?????????????? ??????????????”

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