Multi-mode image processing

Details Multi-mode image processing Multi-mode image processing

2004-12-17

2010-06-08

Lu, Tom Y (Department: 2624)

Image analysis

Image compression or coding

Adaptive coding

C382S166000, C382S167000, C382S232000, C382S233000, C341S051000, C341S055000

Reexamination Certificate

active

07734105

ABSTRACT:
An image encoding and decoding scheme operable according two different modes depending on properties of the processed image is disclosed. In the encoding, an image is decomposed into image blocks (600) comprising image elements (610). The blocks (600) are compressed into block representations (700A,700B) according to one of two compression modes. A block representation (700A;700B) comprises two codewords (720A,730A;720B,730B) representing properties of the image elements (610) in the block (600) and a sequence (740A;740B) of image element associated indices indicative of one of the codewords (720B,730B) or a property representation generated based on a codeword (730A). The block representation (700A;700B) also includes a mode index representing the mode, according to which the block representation (700A;700B) was compressed. This mode index can be provided before, during or after generation of the codewords (720A,730A;720B,730B) and index sequence (740A;740B). In the decoding, the codewords (720A,730A;720B,730B) and index sequence (740A;740B) are used to decompress the block representation (700A;700B) according a decompression mode determined by the mode index (710A;710B).

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