Lecture 15 - Stanford Vision Lab

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• Speed of learning Issues – Slow (many combinations of detectors) • Appearance learnt first, then shape – Difficult to learn part that has stable location but variable appearance – Each detector is used as a cross-correlation filter, giving a hard definition of the part’s appearance • Would like a fully probabilistic representation of the object Fei-Fei Li Lecture 15 - 86 14‐Nov‐11
Object categorization Fergus et. al. CVPR ’03, IJCV ‘06 Fei-Fei Li Lecture 15 - 87 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
Page 35 and 36: Support vector machines • Find hy
Page 37 and 38: Nonlinear SVMs •Datasets that are
Page 39 and 40: Nonlinear SVMs • Nonlinear decisi
Page 41 and 42: Pyramid match kernel • Fast appro
Page 43 and 44: What about multi‐class SVMs? •
Page 45 and 46: Object recognition results • ETH
Page 47 and 48: Learning and Recognition 1. Discrim
Page 49 and 50: Some notations • w: a collection
Page 51 and 52: the Naïve Bayes model c w N Graphi
Page 53 and 54: Csurka et al. 2004 Fei-Fei Li Lectu
Page 55 and 56: Generative vs discriminative • Di
Page 57 and 58: What we will learn today? • Bag o
Page 59 and 60: Parts and Structure Literature •
Page 61 and 62: 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: So far (2)….. • Representation
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 and 114: model () space Model Structure Each
Page 115 and 116: Variational EM Random initializatio
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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