SIFT Feature Descriptor Doesn't Work With ORB Keypoinys

SIFT
ORB

As stated in the title, SIFT Feature Descriptor doesn't work with ORB keypoints, I changed the useProvidedKeypoints to true but it still doesn't work and I get the "Vector subscript out of range" error in the extractor.compute line. Part of the code is below.

ORB detector(500);
detector.detect( img1, keypointsB );

SiftDescriptorExtractor extractor;
extractor.compute( img1, keypointsB, descriptorsB);

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I just get the same problem... Have you find a solution since ?

arie55 (Jan 24 '13)edit

No, I couldn't.

aliciadominica (Feb 26 '13)edit

But they are not supposed to work together.

Rui Marques (Mar 5 '13)edit

@arie55 - I think I found a solution, check out my answer.

Shai (May 13 '13)edit

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answered May 13 '13

Shai
16 ●1 ●1

See this link.
It seems like the error stems from the fact that SIFT tune its octave automatically, while ORB use a fixed umber of octaves.

A workaround might be either to tune the nlevels params of the ORB class according to the maximal detected octave prior to descriptor extraction.
Alternatively, you may reject key points with octave larger than ORB's nlevels.

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answered Dec 30 '12

Emmanuel
71 ●2 ●6

Not sure of what's happening in your case because I can't find the documentation for the SiftDescriptorExtractor class. Did you however try with the original SIFT class ? The code to compute the descriptors in your case becomes:

cv::SIFT siftOperator;
cv::Mat descriptorsB;
siftOperator(img1, cv::Mat(), keypointsB, descriptorsB, true);

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I tried it both ways to no avail. It didn't work :/

aliciadominica (Jan 4 '13)edit

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SIFT Feature Descriptor Doesn't Work With ORB Keypoinys

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SIFT Feature Descriptor Doesn't Work With ORB Keypoinys