Histogram of oriented gradients
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Histograms of oriented gradients 2014/08/22 ked
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A summary of HOG
Transcript of Histogram of oriented gradients
![Page 1: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/1.jpg)
Histograms of oriented gradients
2014/08/22ked
![Page 2: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/2.jpg)
Authors
Navneet Dalal and Bill Triggs
![Page 3: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/3.jpg)
Authors
Navneet Dalal
A founder of Flutter (A gesture recognition startup company created in
2010)
![Page 4: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/4.jpg)
Authors
Navneet Dalal
A founder of Flutter (A gesture recognition startup created in 2010)
![Page 5: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/5.jpg)
Overview – HOG
![Page 6: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/6.jpg)
Gradient
![Page 7: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/7.jpg)
Cell & block
Cell 8 x 8 pixels
Block 2 x 2 cells 50% overlap for neibhbors
![Page 8: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/8.jpg)
Example
For a 64 x 128 image
![Page 9: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/9.jpg)
Quantization
![Page 10: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/10.jpg)
Parameters – bins
![Page 11: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/11.jpg)
Parameters – cell & blcok
![Page 12: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/12.jpg)
Histogram normalization
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Feature description
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Compare to SIFT-- by authors
![Page 15: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/15.jpg)
SVM weight
![Page 16: Histogram of oriented gradients](https://reader034.fdocuments.us/reader034/viewer/2022052205/559628ef1a28ab9b5a8b47c7/html5/thumbnails/16.jpg)
Thx.