lec16_bag_of_words - CS6670: Computer Vision Noah Snavely...

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Lecture 16: Bag-of-words models CS6670: Computer Vision Noah Snavely Object Bag of ‘words’
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Announcements Project 3: Eigenfaces due Wednesday, November 11 at 11:59pm solo project Final project presentations: During the final exams period
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Skin detection results
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Eigenfaces PCA extracts the eigenvectors of A Gives a set of vectors v 1 , v 2 , v 3 , . .. Each one of these vectors is a direction in face space – what do these look like?
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Perceptual and Sensory Augmented Computing Visual Object Recognition Tutorial K. Grauman, B. Leibe Viola-Jones Face Detector: Results 5
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Moving forward Faces are pretty well-behaved Mostly the same basic shape Lie close to a low-dimensional subspace Not all objects are as nice
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Different appearance, similar parts
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Bag of Words Models Adapted from slides by Rob Fergus and Svetlana Lazebnik
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Object Bag of ‘words’
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Origin 1: Texture Recognition Example textures (from Wikipedia)
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Origin 1: Texture recognition Texture is characterized by the repetition of basic elements or textons For stochastic textures, it is the identity of the textons, not their spatial arrangement, that matters Julesz, 1981; Cula & Dana, 2001; Leung & Malik 2001; Mori, Belongie & Malik, 2001; Schmid 2001; Varma & Zisserman, 2002, 2003; Lazebnik, Schmid & Ponce, 2003
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Origin 1: Texture recognition Universal texton dictionary histogram Julesz, 1981; Cula & Dana, 2001; Leung & Malik 2001; Mori, Belongie & Malik, 2001; Schmid 2001; Varma & Zisserman, 2002, 2003; Universal texton dictionary
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Origin 2: Bag-of-words models Orderless document representation: frequencies of words from a dictionary Salton & McGill (1983)
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Origin 2: Bag-of-words models US Presidential Speeches Tag Cloud http://chir.ag/phernalia/preztags/ Orderless document representation: frequencies of words from a dictionary Salton & McGill (1983)
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Origin 2: Bag-of-words models US Presidential Speeches Tag Cloud http://chir.ag/phernalia/preztags/ Orderless document representation: frequencies of words from a dictionary Salton & McGill (1983)
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Origin 2: Bag-of-words models US Presidential Speeches Tag Cloud http://chir.ag/phernalia/preztags/ Orderless document representation: frequencies of words from a dictionary Salton & McGill (1983)
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lec16_bag_of_words - CS6670: Computer Vision Noah Snavely...

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