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About the tutorial of finding image using Features2D + Homograph in openCV

asked 2013-06-30 00:58:37 -0500

Ted WONG gravatar image

updated 2013-06-30 01:10:46 -0500

I download this tutorial source code, and try to play around the the openCV. I use a smile face to test the programme.

image description

And the first testing is a screen shot from my computer: image description

It success and find the smile face. But the other test is using a real life example like this:

image description But this time, the smile face can't be detected.

The match result like this: image description

If I wanna to modify the programme to let it detect the smile face in real life pic. What should I do? Any suggestions? Thanks.

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answered 2013-06-30 18:40:31 -0500

yes123 gravatar image

updated 2013-06-30 18:41:05 -0500

The smile on the right is too much scaled down. Neither SIFT nor other methods will be able to match in such conditions.

Try to reduce the scale of the left image.

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Thanks, this helped a lot!

alexcdot gravatar imagealexcdot ( 2019-02-24 00:32:43 -0500 )edit

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Asked: 2013-06-30 00:58:37 -0500

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Last updated: Jun 30 '13