Lecture 15 - Stanford Vision Lab

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1.Feature detection and representation • Regular grid – Vogel & Schiele, 2003 – Fei‐Fei & Perona, 2005 • Interest point detector – Csurka, Bray, Dance & Fan, 2004 – Fei‐Fei & Perona, 2005 – Sivic, Russell, Efros, Freeman & Zisserman, 2005 • Other methods – Random sampling (Vidal‐Naquet & Ullman, 2002) – Segmentation based patches (Barnard, Duygulu, Forsyth, de Freitas, Blei, Jordan, 2003) Fei-Fei Li Lecture 15 - 14 14‐Nov‐11
1.Feature detection and representation Compute SIFT descriptor [Lowe’99] Normalize patch Detect patches [Mikojaczyk and Schmid ’02] [Mata, Chum, Urban & Pajdla, ’02] [Sivic & Zisserman, ’03] Slide credit: Josef Sivic Fei-Fei Li Lecture 15 - 15 14‐Nov‐11
Page 1 and 2: Lecture 15: Object recognition: Bag
Page 3 and 4: What we will learn today? • Bag o
Page 5 and 6: Related works • Early “bag of w
Page 7 and 8: Analogy to documents Of all the sen
Page 9 and 10: definition of “BoW” - Independe
Page 11 and 12: 1.Feature detection and representat
Page 13: 1.Feature detection and representat
Page 17 and 18: 2. Codewords dictionary formation
Page 19 and 20: 2. Codewords dictionary formation F
Page 21 and 22: Visual vocabularies: Issues • How
Page 23 and 24: 3. Bag of word representation frequ
Page 25 and 26: Learning and Recognition codewords
Page 27 and 28: Discriminative classifiers category
Page 29 and 30: Nearest Neighbors classifier Query
Page 31 and 32: K- Nearest Neighbors classifier fro
Page 33 and 34: 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
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So far….. • Representation - Jo
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(Semi) Unsupervised learning •Kno
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Unsupervised detector training - 2
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Learning • Take training images.
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Detector Selection •Try out diffe
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Learned face model Pre-selected Par
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Background images Fei-Fei Li Lectur
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Detections of Cars Fei-Fei Li Lectu
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3D Object recognition - Multiple mi
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So far (2)….. • Representation
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Object categorization Fergus et. al
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•Kadir & Brady saliency region de
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Motorbikes Samples from appearance
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Background images evaluated with mo
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Airplanes Fei-Fei Li Lecture 15 - 9
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Summary of results Dataset Fixed sc
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Why this design? • Generic featur
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Supplementary materials • One‐S
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Fei-Fei Li Lecture 15 - 103 14‐No
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Algorithm Burl, et al. Weber, et al
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How do we do better than what stati
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Bayesian framework P(object | test,
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Bayesian framework P(object | test,
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model () space Model Structure Each
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Variational EM Random initializatio
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Faces Motorbikes Airplanes Spotted
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Experiments: obtaining priors airpl
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Number of training examples Fei-Fei
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Number of training examples Fei-Fei
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Lecture 15 - Stanford Vision Lab

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