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SIFT Feature Descriptor Doesn't Work With ORB Keypoinys

asked 2012-12-28 05:40:15 -0500

aliciadominica gravatar image

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 gravatar imagearie55 ( 2013-01-23 18:52:05 -0500 )edit

No, I couldn't.

aliciadominica gravatar imagealiciadominica ( 2013-02-26 03:07:17 -0500 )edit

But they are not supposed to work together.

Rui Marques gravatar imageRui Marques ( 2013-03-04 18:03:21 -0500 )edit

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

Shai gravatar imageShai ( 2013-05-13 03:01:33 -0500 )edit

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answered 2013-05-13 03:00:18 -0500

Shai gravatar image

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 2012-12-30 14:16:31 -0500

Emmanuel gravatar image

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 gravatar imagealiciadominica ( 2013-01-04 07:26:47 -0500 )edit
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Asked: 2012-12-28 05:40:15 -0500

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Last updated: May 13 '13