How are the binary descriptors generated in OpenCV? - OpenCV Q&A Forum

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How are the binary descriptors generated in OpenCV?

asked Jun 23 '0

paul_shuvo
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I have been working with the binary descriptors that are implemented in OpenCV. But the descriptors are formed with integer values (shown in red rectangle).

Why are they formed with integer values?

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answered Jun 23 '0

Kafan
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Say you have Orb binary descriptor which is 256 bit long. Then the bits are broken down into 8 bits and are converted to their base10 numerical representation. So 256 bit will be represented by array of 32 integers, and all those integer's value will be between 0 to 255.

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So, during matching using cv2.NORM_HAMMING, are they converted into binary strings/values?

paul_shuvo (Jun 23 '0)edit

1

converted to their base10 numerical representation.

no, that's wrong, there is no conversion. it's just plain consecutive memory, 256 bits will fit into 32 uchar bytes, that's what you see above

berak (Jun 23 '0)edit

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Asked: Jun 23 '0

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Last updated: Jun 22 '20

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