Module imageproc::corners

Functions for detecting corners, also known as interest points.

Structs

• Corner
  A location and score for a detected corner. The scores need not be comparable between different corner detectors.
• OrientedFastCorner
  A FAST corner with associated orientation as described in Rublee, et. al. (2012).

Enums

• Fast
  Variants of the FAST corner detector. These classify a point based on its intensity relative to the 16 pixels in the Bresenham circle of radius 3 around it. A point P with intensity I is detected as a corner if all pixels in a sufficiently long contiguous section of this circle either all have intensity greater than I + t or all have intensity less than I - t, for some user-provided threshold t. The score of a corner is the greatest threshold for which the given pixel still qualifies as a corner.

Functions

• corners_fast9
  Finds corners using FAST-9 features. See comment on Fast enum.
• corners_fast12
  Finds corners using FAST-12 features. See comment on Fast.
• fast_corner_score
  The score of a corner detected using the FAST detector is the largest threshold for which this pixel is still a corner. We input the threshold at which the corner was detected as a lower bound on the search. Note that the corner check uses a strict inequality, so if the smallest intensity difference between the center pixel and a corner pixel is n then the corner will have a score of n - 1.
• oriented_fast
  Finds oriented FAST-9 corners as presented in Rublee et. al. (2012).