gosift

const (
	/** default number of sampled intervals per octave. */
	SIFT_INTVLS = 3
	/** assumed gaussian blur for input image */
	SIFT_INIT_SIGMA = 0.5
	/** default sigma for initial guassian smoothing */
	SIFT_SIGMA = 1.6
	/** double image size before pyramid construction */
	SIFT_IMG_DBL = true
	/** default threshold on keypoint contrast |D(x)| */
	SIFT_CONTR_THR = 0.04
	/** default threshold on keypoint ratio of principle curvatures */
	SIFT_CURV_THR = 10
	/* width of border in which to ignore keypoints */
	SIFT_IMG_BORDER = 5
	/* maximum steps of keypoint interpolation before failure */
	SIFT_MAX_INTERP_STEPS = 5
)