What’s the Disadvantage
•WYSIAYG (What You See Is All You Get): There is no additional information
–no depth (3D) information
–can’t examine scene from a different point of view
–at most can play with the individual pixels or groups of pixels to change colors, enhance contrast, find edges, etc.
•But recently, strong interest in image-based rendering to fake 3D scenes and arbitrary camera positions.  New images constructed by interpolation, composition, warping and other operations.
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Capture of Hair Geometry from Multiple Images, Siggraph 2004