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Discover depth of the bite of an apple.

asked 2012-10-24 21:38:51 -0600

beowulf gravatar image

updated 2012-10-25 17:42:20 -0600

Rui Marques gravatar image

Is there any technique that can be used to discover the depth of the bite of an apple?

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Thank you!

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answered 2012-10-25 02:59:51 -0600

Kirill Kornyakov gravatar image

updated 2012-10-25 03:00:15 -0600

OK, let's try 8-) I don't think that you can estimate the depth without a stereo camera. You can also try the SfM to reconstruct the 3d model of the apple. But most likely results will be not satisfactory, because of weak features. However, you can improve them if the apple is under structured light.

So, my guess is that linear regression may help you. You're biting many-many apples, and try to find dependency between radius of the bite, and its depth. If the results are not satisfactory, you can take more apples to obtain larger training set. Please note that you also need a testing set of bitten apples, which is not intersected with the training set.

If the prediction is still bad, you can try to build other types of regression, for instance your X may be the following ratio: radius_of_bite/radius_of_apple, and your Y may be equal to volume_of_bite / volume_of_apple. You can later try polynomial and non-linear regressions.

And please keep us informed of your progress!

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Thumbs up for mentioning the necessary test set of bitten apples!

Ben gravatar imageBen ( 2012-10-25 05:21:05 -0600 )edit

Thank you, I will be trying and posting results here. I bought some books to help me in this journey, lol.

beowulf gravatar imagebeowulf ( 2012-10-25 08:54:26 -0600 )edit

@beowulf: Is this actually a real project you're working on? I thought this was more for fun...

Ben gravatar imageBen ( 2012-10-25 09:39:16 -0600 )edit

Maybe using some kind of RGBD camera would be helpful? I am not sure of their precision, it would have to be in the order of millimeters. I read that Kinect has depth resolution: ~ 1.5 mm at 50 cm [distance].

Rui Marques gravatar imageRui Marques ( 2012-10-25 17:16:09 -0600 )edit

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Asked: 2012-10-24 21:38:51 -0600

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Last updated: Oct 25 '12