How to separate the foreground from the background in an image?

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Rachel
Rachel 2014-1-4
编辑： Image Analyst 2014-1-4
Hi,
I am working on a project related to image matting. I am trying to separate the foreground of an image from the background. Can anybody please help?
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Image Analyst
Image Analyst 2014-1-4
Most likely, if you supply more information such as an image and a description of what is the foreground and what is the background and what you want to measure (area, count, perimeter, color, etc.)

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Image Analyst
Image Analyst 2014-1-4

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Walter Roberson
Walter Roberson 2014-1-4
There are a number of "optical illusions" around that prove that there is no objective meaning to "foreground" and "background". What is "foreground" in one interpretation might be "background" in a different interpretation of the same image.
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Walter Roberson
Walter Roberson 2014-1-4
I am thinking of a couple of the usual suspects, Necker Cubes, "The Young Lady and the Old Crone", the Chalice.
Looking around briefly, the hollow Chaplin mask is good
I had not seen the Necker Lattice before.
A few others at http://en.wikipedia.org/wiki/Ambiguous_image
Image Analyst
Image Analyst 2014-1-4
编辑：Image Analyst 2014-1-4
Thanks for those. By the way, there is some research into "Main Subject Detection" - I think by those involved in stockphotography databases (CBIR) and camera manufacturers:
http://www.bing.com/search?q=main+subject+detection&qs=n&form=QBLH&pq=main+subject+detection&sc=0-0&sp=-1&sk=&cvid=2c077cda730d4ae3a447c74ab97b7343
https://www.google.com/#q=main+subject+detection
Also, attached is an example that I've collected of one-eyed 3D. Blow it up full screen, it looks fairly planar with both eyes open, then close one eye and it looks more 3D-like than if both eyes are open.

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