Some compilation-time problems corrected
New line extraction method and OpenCV standards accomplished
Reinsertion of OctaveKeyLines
Added methods for derivation from FeatureDetector
Errors on derivation corrected
computeImpl method designed, Gaussian pyramids in a separate function
Derivation from Feature2D completed. Warnings corrected.
Inheritage completed. Functions with KeyLine objects added.
Lines extraction and descriptors testing completed
Matcher ported, first page od documentation written.
First part of documentation completed
Matcher functionalities' tests completed
File names changed