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cv_orb

Provides ORB: An efficient alternative to SIFT/SURF

Calling Sequence

kp,des=cv_orb(image,nfeatures,scaleFactor,color,displayimage)

Arguments

image

Input image

nfeatures

The maximum number of features to retain

scaleFactor

Pyramid decimation ratio, greater than 1. scaleFactor==2 means the classical pyramid, where each Next level has 4x less pixels than the previous, but such a big scale factor will degrade feature matching scores dramatically. On the other hand, too close to 1 scale factor will mean that to cover certain scale Range you will need more pyramid levels And so the speed will suffer.

color

color of keypoints drawn on Input image

displayimage

If 1 it will show the keypoints drawn on Input Image Else it doesn Not

kp

Keypoints of Descriptor

des

Descriptors of Input image

Description

ORB: An efficient alternative to SIFT / SURF

ORB Is basically a fusion of FAST keypoint detector And BRIEF descriptor With many modifications to enhance the performance. First it use FAST to find keypoints, then apply Harris corner measure to find top N points among them. Now For descriptors, ORB use BRIEF descriptors.

Examples

[kp,des] = cv_orb(input_image,100,2,(0,255,0),1);

See Also


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