opencv notes

feature2d

cv::Feature2D is the abstract base class for 2D image feature detectors and descriptor extractors.

cv::xfeatures2d::SIFT and cv::xfeatures2d::SURF are inherit from it.

uchar

defined in core/types_c.h:

#ifndef HAVE_IPL
   typedef unsigned char uchar;
   typedef unsigned short ushort;
#endif

Reference

• cv::Feature2D Class Reference