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Is there anyway of segmenting objects based on how far they are from the viewer?

Can color values assess this sort of a thing for us? How will intensity levels help in determining how far the object is from the viewer?

enter image description here

Another image:

enter image description here

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migrated from stackoverflow.com Apr 14 '12 at 20:13

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    $\begingroup$ This is not segmentation, it's 3D reconstruction. Do you have other images that capture the scene from a different view or under different lighting conditions? $\endgroup$ – Emre Apr 14 '12 at 23:08
  • $\begingroup$ i have provided another image with a different angle $\endgroup$ – vini Apr 16 '12 at 11:10
  • $\begingroup$ Now you can follow en.wikipedia.org/wiki/3D_reconstruction_from_multiple_images $\endgroup$ – Emre Apr 16 '12 at 18:05
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This is an extremely difficult task, one which is a very active line of research. I've managed to find a semi-recent paper on the subject. I won't go into the details, but here's a few things that this paper found that can be used.

  1. Textures: If you see a given texture, they can help you figure out how far something is away. The wood texture here would be quite ideal for this.
  2. Fixed object sizes: Identify common objects, see how large they are, and use them to help with depth analysis. The phone book, soda bottle, etc should work well with this.
  3. Focus: If you know how the picture was take, focus can help you identify ranges.
  4. Shadows- If you know where the light was coming from, shadows can help you identify how tall objects are, and thus how far they are away.
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  • $\begingroup$ Thanks for that reference yup will look into that however what more methods could be considered while approaching this problem $\endgroup$ – vini Apr 11 '12 at 14:04
  • $\begingroup$ Most 3D techniques are found in research papers could i found codes related to these topics? $\endgroup$ – vini Apr 13 '12 at 8:09
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    $\begingroup$ @vini Cornell has a research page with depth estimation from a single image and shares code. $\endgroup$ – Maurits Apr 14 '12 at 20:53
  • $\begingroup$ Yes i do have that code however which file to run is a problem in it $\endgroup$ – vini Apr 15 '12 at 12:22
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See this code from matlab website: "Depth from gradient":

http://www.mathworks.com/matlabcentral/fileexchange/45269-dfgbox

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