Method and system for writing and reading coded data

Details Method and system for writing and reading coded data Method and system for writing and reading coded data

1991-10-22

1993-09-28

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

3582611, 358427, H04N 121, H04N 1419

Patent

active

052490661

ABSTRACT:
A method of writing and reading coded data writes and reads the coded data which are coded by an orthogonal transform coding so that an original image can be restored progressively or sequentially, where the original image is divided into blocks of an arbitrary number of pixels and the coded data are obtained by coding quantization coefficients which are obtained when gradation levels of the pixels within each block are subjected to a two-dimensional discrete cosine transform. The method includes the steps of extracting the quantization coefficients for each restoration stage, subjecting the extracted quantization coefficients to a variable length coding, writing the variable length coded quantization coefficients into storage means as the coded data, reading the coded data from the storage means, restoring a code length of the coded data based on the read coded data, extracting coded data corresponding to the restored code length from the read coded data, and outputting the extracted coded data as coded data required in each restoration stage.

REFERENCES:
patent: 4121259 (1978-10-01), Preuss
patent: 4414580 (1983-11-01), Johnsen
patent: 4581638 (1986-04-01), Chiarigline
patent: 4608607 (1986-08-01), Adachi
patent: 4698689 (1987-10-01), Tzou
patent: 4766499 (1988-08-01), Inuzuka
patent: 4805030 (1989-02-01), Tanaka
patent: 4807042 (1989-02-01), Tanaka
patent: 4809081 (1989-02-01), Linehan
patent: 4920426 (1990-04-01), Hatori
Video, Audio and Data Recording, vol. 79, (Mar. 22, 1988) pp. 199-201.
Optical Engineering, vol. 26, No. 7 (Jul. 1987) pp. 581-589.
"A Study on CODEC for Still Images with Sequential/Progressive Build Up", Miura et al, National Conference of Electronics and Information Communication Society, Fall 1988.
Digital Compression and Coding of Continuous-Tone Still Images Part 1: Requirements and Guidelines; ISO/IEC Publication; Date of Circulation: Mar. 15, 1991; Ref: ISO/IEC JTC 1/sc2 N2215.
A Study of CODEC for Still Images with Sequential/Progressive Build Up; By: Tsunehiro Miura et al, C & C Information Technology Res. Labs. NEC Corporation.

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