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Illustration of errors due to interreflections
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Due to interreflections, the marked scene point is brighter
when not directly lit (inverse pattern) as compared to when
directly lit. This results in a binarization error as shown
on the right. Such errors can happen for low-frequency projected patterns.
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Decoding for high-frequency patterns
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High frequency patterns are binarized correctly in
the presence of interreflections. See paper for explanation.
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Logical coding and decoding:
Designinng patterns with high spatial frequencies
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By using simple logical operations, codes with only high spatial
frequencies can be constructed from conventional codes.
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Depth map comparison
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Since conventional codes make errors for low frequency patterns
(high significance bits), the resulting error in depth maps is large.
Our logical codes produce a nearly error
free depth map while requiring the same number of images as conventional codes.
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