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Histogram of oriented gradients
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Histogram of oriented gradients
1.
Histograms of oriented
gradients 2014/08/22 ked
2.
Authors Navneet Dalal
and Bill Triggs
3.
Authors Navneet Dalal
A founder of Flutter (A gesture recognition startup company created in 2010)
4.
Authors Navneet Dalal
A founder of Flutter (A gesture recognition startup created in 2010)
5.
Overview – HOG
6.
Gradient
7.
Cell & block
Cell 8 x 8 pixels Block 2 x 2 cells 50% overlap for neibhbors
8.
Example For a
64 x 128 image
9.
Quantization
10.
Parameters – bins
11.
Parameters – cell
& blcok
12.
Histogram normalization
13.
Feature description
14.
Compare to SIFT --
by authors
15.
SVM weight
16.
Thx.
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