DCT/inverse DCT arithmetic unit using both of a first and second

Details DCT/inverse DCT arithmetic unit using both of a first and second DCT/inverse DCT arithmetic unit using both of a first and second

1995-10-06

1996-06-18

Mai, Tan V.

Boots, shoes, and leggings

G06F 738

Patent

active

055285333

ABSTRACT:
In a DCT (discrete cosine transformation)/inverse DCT arithmetic unit, data of an inputted image are inputted to a first one-dimensional N-th order DCT/inverse DCT arithmetic device using a first algorithm B. The first one-dimensional N-th order DCT/inverse DCT arithmetic device calculates a one-dimensional N-th order inverse DCT. Calculated results of the first one-dimensional N-th order DCT/inverse DCT arithmetic device are stored to a memory for intermediate results as intermediate results of the N-th order inverse DCT in M-dimensions. Similarly, a second one-dimensional N-th order DCT/inverse DCT arithmetic device calculates a one-dimensional N-th order inverse DCT using a second algorithm A, with stored data of the memory for intermediate results as an input. Calculated results of the second one-dimensional N-th order DCT/inverse DCT arithmetic device are outputted to the memory for intermediate results. Similarly, an M-th one-dimensional N-th order DCT/inverse DCT arithmetic device calculates a one-dimensional N-th order DCT/inverse DCT. Calculated results finally obtained by the M-th one-dimensional N-th order DCT/inverse DCT arithmetic device are set as output data, This DCT/inverse DCT arithmetic unit has a high arithmetic operation speed and a high arithmetic accuracy.

REFERENCES:
patent: 5268853 (1993-12-01), Tamaka et al.
patent: 5276784 (1994-01-01), Ohki
"A New Algorithm to Compute the Discrete Cosine Transform", Lee et al., IEEE Transactions on Acoustics, Speech and Signal Processing, ASSP-32, No. 6, pp. 1243-1245, Dec. 1984.

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