DCT/IDCT with minimum multiplication

Details DCT/IDCT with minimum multiplication DCT/IDCT with minimum multiplication

2006-04-25

2006-04-25

An, Shawn S. (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C375S240200, C375S240250, C375S240180, C375S240260, C375S240010, C375S240240, C708S402000, C708S401000, C382S250000, C382S233000, C382S248000, C382S235000

Reexamination Certificate

active

07035332

ABSTRACT:
A method, apparatus, computer medium, and other embodiments for discrete cosine transform and inverse discrete cosine transform (DCT/IDCT) of image signals are described. A DCT/IDCT module includes a plurality of different cores. One embodiment of a core includes two sets of lookup tables to provide multiplication and add operations for the DCT and IDCT functions. Another embodiment of a core include one set of lookup tables, while another embodiment of a core includes no lookup table. The DCT/IDCT module provides forward DCT and IDCT functionality without the use of additional multipliers.

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