Forums - Details on the FastCV HOG implementation

1 post / 0 new
or Register
Details on the FastCV HOG implementation
ariel.benitah
Join Date: 14 Apr 15
Posts: 5
Posted: Tue, 2015-08-04 23:53
Top

Hi,

  1. I've seen that in the new FastCV release 1-7-0, there is a new procedure for Histogram of Oriented Gradient (HOG) features extraction called fcvExtractHOGu16(). First of all, thanks a lot for adding this procedure.
  2. A few questions though: 
  3.  
  4. 1. there are a lot of ways to implement HOG. The most common are the original one by Dallal & Triggs and another one which seems to be really     fast by Piotr Dollar. Which implementation is used in the FastCV library? or Is the FastCV implementation comparable to the one provided by Matlab or OpenCV?
  5. 2. the input are the "strenght" and "orientation". Do you mean strenght == magnitude = sqrt(Gx^2 + Gy^2) and orientation== phase=            atan2(Gx,Gy)?
  6. 3. Is the lenght of the hogVector calculated the same way as Matlab do it? - http://www.mathworks.com/help/vision/ref/extracthogfeatures.html
  7. 4. What is the difference between FASTCV_HOG_NORM_REGULAR , FASTCV_HOG_NORM_RENORMALIZATION and FASTCV_HOG_NORM_FHOG?
  8. 5. Is the bolckStep parametter the overlap between blocks? binSize, the number of orientations in the Histogram?...
  9. 6. Can you point me to a paper, a link,  descrbing in more details the FastCV implementation of HOG.

 

Thanks a lot for your help.

Ariel

  • Up0
  • Down0

Opinions expressed in the content posted here are the personal opinions of the original authors, and do not necessarily reflect those of Qualcomm Incorporated or its subsidiaries (“Qualcomm”). The content is provided for informational purposes only and is not meant to be an endorsement or representation by Qualcomm or any other party. This site may also provide links or references to non-Qualcomm sites and resources. Qualcomm makes no representations, warranties, or other commitments whatsoever about any non-Qualcomm sites or third-party resources that may be referenced, accessible from, or linked to this site.