Matrix multiplier and picture transforming coder using the same

Details Matrix multiplier and picture transforming coder using the same Matrix multiplier and picture transforming coder using the same

1991-12-19

1994-06-28

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358433, 358471, 358426, 382 56, H04N 140

Patent

active

053252152

ABSTRACT:
A matrix multiplier used in a picture transforming coder is provided for multiplying an input signal matrix by a coefficient matrix configured to comprise as many constant multipliers as absolute values of coefficients in the transform coefficient matrix for handling the signal matrix as common multiplicands, a plurality of selectors for selecting values necessary for computing elements of the matrix product from multiplication results output by the constant multipliers and a respective accumulator assigned to each of the selectors for accumulating the selected values to finally provide an element of the matrix product. As a result, since the processing can be done by merely performing as many fixed multiplications as absolute values of the coefficients in the transform coefficient matrix, the multipliers can be implemented as a relatively simple combination of adders, allowing the entire size of a picture information transforming coder or the like to be reduced.

REFERENCES:
patent: 4774587 (1988-09-01), Schmitt
patent: 4922273 (1990-05-01), Yonekawa et al.
patent: 5170264 (1992-12-01), Saito et al.
patent: 5187755 (1993-02-01), Aragaki

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