Method of image signal encoding by orthogonal transformation

Details Method of image signal encoding by orthogonal transformation Method of image signal encoding by orthogonal transformation

1987-01-27

1989-02-21

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

364725, H04N 1419

Patent

active

048070424

ABSTRACT:
A method of image signal encoding by orthogonal transformation comprises the steps of obtaining transformed signals by conducting orthogonal transformation on two-dimensional image signals based on a predetermined orthogonal function, and encoding each of the transformed signals with an intrinsic allocated code length. The transformed signal is encoded with a code length obtained by adding an extension code length to the allocated code length when the transformed signal attains a value not smaller than the maximum value within the range encodeable with the allocated code length or a value not larger than the minimum value within the encodeable range.

REFERENCES:
patent: 4698689 (1987-10-01), Tzou
patent: 4731860 (1988-03-01), Wahl

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