Method and apparatus for adaptive transform coding of picture si

Details Method and apparatus for adaptive transform coding of picture si Method and apparatus for adaptive transform coding of picture si

1978-02-13

1980-09-30

Boudreau, Leo H.

Communications: electrical

Digital comparator systems

G06K 912

Patent

active

042258855

ABSTRACT:
A method and apparatus to reduce the redundancy for the transmission or storage of picture signals using transforms. The basis coefficients are arranged in a sequence and thereafter quantized in the customary manner. The basis coefficients obtained from the transformation are sequentially examined to see if they exceed a predetermined value, for example the average value across the entire picture. The number of times the value is exceeded is counted. If, in a sequence class, the number of coefficients exceeding the predetermined value is more than half the total number in the sequence class then the associated sequences are quantized with a larger number of bits. For this purpose, activity classes are formed which indicate which sequences in the picture are active and the characteristic of the quantizer is controlled by this class information.

REFERENCES:
patent: 3662341 (1972-05-01), Baumgartner et al.
patent: 3715724 (1973-02-01), DeMonte et al.
patent: 3805239 (1974-04-01), Watanabe
patent: 3921135 (1975-11-01), Komaru et al.
patent: 3935562 (1976-01-01), Stephens
patent: 3973239 (1976-08-01), Kakumoto et al.
patent: 4075604 (1978-02-01), DeGasperi
Dorr et al., "Adaptive Thresholding for a Mark Reading System", IBM Tech. Disclosure Bulletin, vol. 15, No. 8, Jan. 1973, pp. 2597-2598.

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