SPS, Wed 16/03/2011, TVNUM, 10h30:
Speaker: Rémy Labbé
Title: "Scale & Affine Invariant Interest Point Detectors"
Local features have been shown to be well suited to matching and recognition as well as to many other applications as they are robust to occlusion, background clutter and other content changes. The difficulty is to obtain invariance to viewing conditions. This SPS presents a scale and affine invariant detection algorithm test bench for particle disease localization and extraction in the context of infected hip prosthesis. Infections are observed on 2D X-ray images. The detector is based on the following results : (1) Interest points extracted with the Harris detector can be adapted to affine transformations and give repeatable results (geometrically stable). (2) The characteristic scale of a local structure is indicated by a local extremum over scale of normalized derivatives (the Laplacian). (3) The affine shape of a point neighborhood is estimated based on the second moment matrix.
Last updated September 25, 2013, at 09:15 AM