Simple SURF Detector that checks number of descriptors in an image.
USAGE: ./surf_detector [OPTIONS] input_file
Options:
-h [ --help ] print help messages
-d [ --display ] display keypoints
-W [ --width ] arg minimum width
-H [ --height ] arg minimum height
-D [ --descriptors ] arg minimum number of descriptors
-o [ --output-file ] arg save input image keypoints
--input-file arg input file