Circuit and method for performing a two-dimensional...

Image analysis – Image compression or coding – Including details of decompression

Reexamination Certificate

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C382S232000

Reexamination Certificate

active

07076105

ABSTRACT:
An image decoder performs a 2-D transform as a series of 1-D transforms, and does so in a more efficient manner than prior decoders. The decoder includes a memory and a processor coupled to the memory. The processor is operable to store a column of values in the memory as a row of values, combine the values within the stored row to generate a column of resulting values, and store the resulting values in the memory as a row of resulting values. Such an image decoder can store values in a memory register such that when the processor combines these values to generate intermediate IDCT values, it stores these intermediate IDCT values in a transposed fashion. Thus, such an image decoder reduces the image-processing time by combining the generating and transposing of the intermediate IDCT values into a single step. The image decoder can store the values in a memory register such that when the processor combines these values to generate the intermediate IDCT values, it stores these intermediate IDCT values in a transposed and even-odd-separated fashion. Thus, such an image decoder reduces the image-processing time by combining the generating, transposing, and even-odd separating of the intermediate IDCT values into a single step.

REFERENCES:
patent: 5995080 (1999-11-01), Biro et al.
W.H. Chen, et al., “A Fast Computational Algorithm for the Discrete Cosine Transform”, IEEE Transactions on Communications, vol. COM-25, No. 9, Sep., 1977, pp. 1004-1009.
T. Masaki, et al., “VLSI Implementation of Inverse Discrete Cosine Transformer and Motion Compensator for MPEG2 HDTV Video Decoding”, IEEE Transactions on Circuits And Systems for Video Technology, vol. 5, No. 5, Oct., 1995, pp. 387-395.
W. Lee, “Architectures and Algorithms for MPEG Video Coding”, Ph.D. Dissertation, University of Washington, Seattle, WA, 1997.

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