Inverse tone mapping for bit-depth scalable image coding

Details Inverse tone mapping for bit-depth scalable image coding Inverse tone mapping for bit-depth scalable image coding

2007-06-26

2011-12-27

Simitoski, Michael (Department: 2439)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240200, C382S162000, C382S169000, C382S232000, C382S233000, C382S248000, C382S250000, C382S254000, C382S274000, C358S001900, C358S002100, C358S504000, C358S518000

Reexamination Certificate

active

08085852

ABSTRACT:
A method performs inverse tone mapping of an image in a decoder. For each block of each color channel of the image the following steps are performed. A scaling factor is determined for a current block of the image by adding a predicted scaling factor for the current block to a difference between the predicted scaling factor and the scaling factor of an adjacent block. An offset value for the current block is determined by adding a predicted offset for the current block to a difference between the predicted offset value and the offset value of the adjacent block. The scaling factor and the offset value are applied to pixel intensity values of the current block to produce a mapped block in which a bit-depth of the mapped block is greater than the bit-depth of the current block.

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