Install note about SIFT and SURF feature extraction with OpenCV 3.0.
Install note about SIFT and SURF feature extraction with OpenCV 3.0.

oscarlorentzon/OpenSfM,oscarlorentzon/OpenSfM,sunbingfengPI/OpenSFM_Test,mapillary/OpenSfM,edgarriba/OpenSfM,mapillary/OpenSfM,BrookRoberts/OpenSfM,mapillary/OpenSfM,BrookRoberts/OpenSfM,sunbingfengPI/OpenSFM_Test,edgarriba/OpenSfM,BrookRoberts/OpenSfM,mapillary/OpenSfM,BrookRoberts/OpenSfM,oscarlorentzon/OpenSfM,edgarriba/OpenSfM,edgarriba/OpenSfM,oscarlorentzon/OpenSfM,edgarriba/OpenSfM,oscarlorentzon/OpenSfM,BrookRoberts/OpenSfM,sunbingfengPI/OpenSFM_Test,sunbingfengPI/OpenSFM_Test,sunbingfengPI/OpenSFM_Test,mapillary/OpenSfM