Rapid and low cost of inverse discrete cosine transform...

Details Rapid and low cost of inverse discrete cosine transform... Rapid and low cost of inverse discrete cosine transform...

2004-07-22

2008-11-11

Malzahn, David H (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

07451170

ABSTRACT:
A data processing system transforms an input matrix with transform coefficients through an inverse discrete cosine transform procedure, and it consequentially obtains an output matrix. The input matrix comprises 2N×2Nof discrete cosine transform coefficients, and the output matrix comprises 2N×2Nof output data; both are sequentially indexed by the row and column index. The output matrix is obtained by summing up a plurality of partial output matrixes; each partial output matrix comprises a first partial sub-output matrix and at least one other partial sub-output matrix. The first partial sub-output matrix comprises a plurality of partial output data that has a predetermined symmetry characteristic. The partial output matrixes possess a number of symmetry relations. The first and other partial sub-output matrixes of each partial output matrix have one symmetry relation. The data processing system comprises a system controller, a calculating unit, a symmetry duplicator, a summation device and four summed partial sub-output matrix register.

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An Efficient Two-Dimensional inverse Discrete Cosine Transform Algorithm for HDTV Receivers Jar-Ferr Yang, Member, IEEE, Bor-Long Bai, and Shih-Chang Hsia IEEE Transactions on Circuits and Systems for Video Technology, vol. 5, No. 1, Feb. 1995.

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