Lecture 15 - Stanford Vision Lab

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p Learning Model Distribution object, train p train , object p •use Prior information • Bayesian learning • marginalize over theta Variational EM (Attias, Hinton, Minka, etc.) Fei-Fei Li Lecture 15 - 114 14‐Nov‐11
Variational EM Random initialization new ’s E-Step M-Step new estimate of p(|train) Fei-Fei Li prior knowledge of p() Lecture 15 - 115 14‐Nov‐11
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Lecture 15: Object recognition: Bag
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What we will learn today? • Bag o
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Related works • Early “bag of w
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Analogy to documents Of all the sen
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definition of “BoW” - Independe
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1.Feature detection and representat
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2. Codewords dictionary formation
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2. Codewords dictionary formation F
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Visual vocabularies: Issues • How
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3. Bag of word representation frequ
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Learning and Recognition codewords
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Discriminative classifiers category
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Nearest Neighbors classifier Query
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K- Nearest Neighbors classifier fro
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Learning and Recognition 1. Discrim
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Support vector machines • Find hy
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Nonlinear SVMs •Datasets that are
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Nonlinear SVMs • Nonlinear decisi
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Pyramid match kernel • Fast appro
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What about multi‐class SVMs? •
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Object recognition results • ETH
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Learning and Recognition 1. Discrim
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Some notations • w: a collection
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the Naïve Bayes model c w N Graphi
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Csurka et al. 2004 Fei-Fei Li Lectu
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Generative vs discriminative • Di
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What we will learn today? • Bag o
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Parts and Structure Literature •
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Deformations A B C D Fei-Fei Li Lec
Page 63 and 64: Background clutter Fei-Fei Li Lectu
Page 65 and 66: Learning Models `Manually’ • Ob
Page 67 and 68: So far….. • Representation - Jo
Page 69 and 70: (Semi) Unsupervised learning •Kno
Page 71 and 72: Unsupervised detector training - 2
Page 73 and 74: Learning • Take training images.
Page 75 and 76: Detector Selection •Try out diffe
Page 77 and 78: Learned face model Pre-selected Par
Page 79 and 80: Background images Fei-Fei Li Lectur
Page 81 and 82: Detections of Cars Fei-Fei Li Lectu
Page 83 and 84: 3D Object recognition - Multiple mi
Page 85 and 86: So far (2)….. • Representation
Page 87 and 88: Object categorization Fergus et. al
Page 89 and 90: •Kadir & Brady saliency region de
Page 91 and 92: Motorbikes Samples from appearance
Page 93 and 94: Background images evaluated with mo
Page 95 and 96: Airplanes Fei-Fei Li Lecture 15 - 9
Page 97 and 98: Summary of results Dataset Fixed sc
Page 99 and 100: Why this design? • Generic featur
Page 101 and 102: Supplementary materials • One‐S
Page 103 and 104: Fei-Fei Li Lecture 15 - 103 14‐No
Page 105 and 106: Algorithm Burl, et al. Weber, et al
Page 107 and 108: How do we do better than what stati
Page 109 and 110: Bayesian framework P(object | test,
Page 111 and 112: Bayesian framework P(object | test,
Page 113: model () space Model Structure Each
Page 117 and 118: Faces Motorbikes Airplanes Spotted
Page 119 and 120: Experiments: obtaining priors airpl
Page 121 and 122: Number of training examples Fei-Fei
Page 123 and 124: Number of training examples Fei-Fei
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Lecture 15 - Stanford Vision Lab

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