Hadamard transform coefficient predictor

Details Hadamard transform coefficient predictor Hadamard transform coefficient predictor

1997-12-11

1999-12-28

Boudreau, Leo H.

Image analysis

Image transformation or preprocessing

Walsh, hough, or hadamard transform

382246, 382248, 3582621, G06F 15332

Patent

active

060092114

ABSTRACT:
In an Hadamard transform coefficient predictor for 8-point and/or 8.times.8-point Hadamard transform, when the transform coefficients of one-dimensional 8-point Hadamard transform are represented by y(0), y(1), . . . , y(7) from the lowest order, y(1) is multiplied by 1/2 and output as a prediction value of y(3), y(2) is multiplied by 1/4 and output as a prediction value of y(4), y(2) is multiplied by 1/2 and output as a prediction value of y(6), and y(1) is multiplied by 1/4 and output as a prediction value of y(7). Alternatively, when a and b represent real numbers which are above zero and below 1, the multiplication value of y(2) and b/2 and the multiplication value of y(4) and (2-2b) are added to each other, and the addition result is output as a prediction value of y(6). Further, the multiplication value of y(1) and a/4 and the multiplication value of y(3) and (1-a)/2 are added and the addition result is output as a prediction value of y(7). The same construction is also applicable for the two-dimensional 8.times.8 Hadamard transform.

REFERENCES:
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patent: 4772946 (1988-09-01), Hammer
patent: 5001559 (1991-03-01), Gonzales et al.
patent: 5751856 (1998-05-01), Hirabayashi
patent: 5805293 (1998-09-01), Mochizuki
Mochizuki, "AC coefficient prediction for the Hadamard transform and its application to image coding", Information Tech. Res. Labs, NEC, vol. 96, No. 544, 15-22 (1997).
Mochizuki, "In-block prediction between Hadamard transform coefficients", Information Tech. Res. Labs, NEC Corp., 50, (1997)--D-11-50.

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