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Histograms of Oriented Gradients 1.0

  Date Added: April 03, 2013  |  Visits: 225

Histograms of Oriented Gradients

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A mex function for calculating histograms of (oriented) gradients as described in the paper "Histograms of Oriented Gradients for Human Detection"[1]: can be called with either one or two arguments :hogs = HoG(Image,Params);orhogs = HoG(Image);Params should be a size 5 vector with:Params(0) = number of orientation bins.Params(1) = cell size.Params(2) = block size.Params(3) = 1 for oriented gradients and 0 otherwise.Params(4) = value for clipping of the L2-norm.See [1] for more details on these values.If the function is called with only one parameter then the default values are used:Params = [9 8 2 0 0.2];Function can be called for both a RGB and grayscale image.Though the function can be called for uint8 image data, there is a considerable speedup if it is called as HoG(double(Image)).Finally [1] mentions the possibility of downweighting "pixels near the edgesof the block by applying a Gaussian spatial window..." and that this leads to and increase in performance of 1% at 10^-4 FPPW. This downweighting scheme is not used by this function.The HoG function code is part of the MASH public descriptors ("heuristics"):

Requirements: No special requirements
Platforms: Matlab
Keyword: Considerable Finally Hogdoubleimage Image Mentions Speedup Uint
Users rating: 0/10

License: Shareware Size: 10 KB
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