machine vision:can computer tell depth?

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Is it possible for someone to write a program that tells if an object is behind another?
e.g can this photo http://oi33.tinypic.com/14jqjom.jpg[^]
be read by a program and the program inputs "black object is in front of the red object"?

Posted 18-May-14 7:37am

EbolaHost

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EbolaHost 18-May-14 13:39pm

Im not asking for someone to write me a program.I just want to know if there's a solutions
Also.. It's "outputs" not "inputs".. I cant seem to find the edit button on my phone

OriginalGriff 18-May-14 13:48pm

The edit button is "Improve question" and it's at the bottom right of your question text.

EbolaHost 18-May-14 14:01pm

Yeah i know but it seems to be hiding today(no joking)

SoMad 18-May-14 14:07pm

Those controls are hidden and show up on mouse hover. Try touching somewhere in the middle of the post to see if that reveals the controls.

Soren Madsen

OriginalGriff 18-May-14 14:13pm

I can't see it either, if I'm in "mobile" mode - scroll to the bottom left of the page and switch to "Full site" - you'll see it then.
I'll report it in sugs'n'bugs...

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Oliver Bleckmann · Answer 1 · 2014-05-18T08:32:00

yes, you can!
but... this capability is limited by some factors:
1. you cannot tell if an object is behind another object if it is a photo and the objects are unknown to your brain (in the sense of recognition) e.g. they are just random polygons, so neither you nor a machine (capable of 3d vision) can tell. But, as soon as these objects are moving take a look at #3
2. so either your machine has a database to look up objects like "hey this is half of a car, so the rest must be hidden behind another object" -> car is in background! This works even in 2D.
or
3. your machine must be capable of moving the "head" (just a bit) to see if some more of any of these objects gets visible. that's another trick humans use to tell and is only possible on a 3d system.

maybe there are some other ticks but head/camera movement and object tracking maybe combined with an object database would perfectly solve this problem - in theory!

there may be other methods. about 10 year ago I played around with intels opencv and a tv card, and when it comes to tracking humans, sports on tv are perfect "training material" because you can use the geometry of the human body, tricot colors or even public faces (free and public available) as training material. and, these events are all filmed nearly at same distance, angle, etc. so perfect conditions!

have fun