Skip to content
GitLab
Projects Groups Snippets
  • /
  • Help
    • Help
    • Support
    • Community forum
    • Submit feedback
    • Contribute to GitLab
  • Sign in
  • bob bob
  • Project information
    • Project information
    • Activity
    • Labels
    • Members
  • Repository
    • Repository
    • Files
    • Commits
    • Branches
    • Tags
    • Contributors
    • Graph
    • Compare
  • Issues 3
    • Issues 3
    • List
    • Boards
    • Service Desk
    • Milestones
  • Merge requests 0
    • Merge requests 0
  • CI/CD
    • CI/CD
    • Pipelines
    • Jobs
    • Schedules
  • Deployments
    • Deployments
    • Environments
    • Releases
  • Monitor
    • Monitor
    • Incidents
  • Analytics
    • Analytics
    • Value stream
    • CI/CD
    • Repository
  • Wiki
    • Wiki
  • Activity
  • Graph
  • Create a new issue
  • Jobs
  • Commits
  • Issue Boards
Collapse sidebar
  • bobbob
  • bobbob
  • Issues
  • #84
Closed
Open
Issue created Sep 18, 2012 by André Anjos@andre.anjos💬Owner

GradientMaps orientation is wrong (This affects HOG descriptors)

Created by: laurentes

There is a bug when computing the orientation maps using the bob::ip::GradientMaps class. This currently affects the computation of HOG descriptors.

This was originally caused by a mistake in the blitz++ documentation available at late www.oonumerics.org. A copy of this documentation can be found here, with the mistake: http://www-cecpv.u-strasbg.fr/Documentations/blitz/blitz_3.html#SEC89. The signature of the blitz::atan2 reduction is indeed wrong. The correct version is blitz::atan2(y,x) instead of the blitz::atan2(x,y). The fixed version is consistent with the signature of the standard function atan2(y,x) (http://www.cplusplus.com/reference/std/valarray/atan2/).

Assignee
Assign to
Time tracking