Method and apparatus for performing spatial-to-frequency...

Image analysis – Image compression or coding – Transform coding

Reexamination Certificate

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C382S250000

Reexamination Certificate

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07046855

ABSTRACT:
In some embodiments of the present invention, quantized frequency coefficients of a matrix of spatial data are obtained. Blocks of frequency coefficients that will be zero-valued after quantization are identified. Only frequency coefficients belonging to other blocks are calculated explicitly using the spatial-to-frequency transform.

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Murata et al., “Fast 2D IDCT Implementation with multimedia Instructions for a software MPEG2 Decoder”, Acoustics, Speech and Signal Processing, 1998, Proceedings of the 1998 IEEE International Conference on Seattle, WA, USA, May 12-15, 1998, New York NY, USA, pp. 3105-3108, XP010279503.
Lengwehasatit et al., “Distortion/decoding time tradeoffs in software DCT-based image coding”, Acoustics, Speech and Signal Processing, 1997, ICASSP-97, 1997 IEEE International Conference in Munich, Germany Apr. 21-24, 1997, Los Alamitos, CA, USA, IEEE Comput. Soc, pp. 2725-2728, XP010225719.

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