Data compression method and apparatus and data expansion method

Details Data compression method and apparatus and data expansion method Data compression method and apparatus and data expansion method

1995-11-15

2000-10-24

Hilten, John S.

Typewriting machines

Including control of format and selection of type-face by...

400 76, B41J 530

Patent

active

061356530

ABSTRACT:
A predictive function expressed by a dot matrix is applied to binary image data and an object dot is converted into, e.g., white data so as to increase the number of white data. A run length coding is performed on the image data where the number of the white data is increased, thus compression is performed on the image data at high compression rate. When expanded, the compressed image data is expanded by run length decoding. A reverse prediction is performed by using the predictive function, thus, original image data is obtained.

REFERENCES:
patent: 4646356 (1987-02-01), Anderson et al.
patent: 4831657 (1989-05-01), Casey et al.
patent: 4903312 (1990-02-01), Sato
patent: 5020121 (1991-05-01), Rosenberg
patent: 5058187 (1991-10-01), Kim
patent: 5274719 (1993-12-01), Taniguchi et al.
patent: 5319463 (1994-06-01), Hongu
patent: 5327254 (1994-07-01), Daher
patent: 5355232 (1994-10-01), Katoaka
patent: 5537616 (1996-07-01), Higuchi
patent: 5751860 (1998-05-01), Su et al.
IBM Technical Disclosure Bulletin vol. 25 No. 10 Mar. 1983 (2 pages).
IBM Technical Disclosure Bulletin, vol. 23, No. 12, May 1981, New York US pp. 5468-5470, P.R. Spivey `Hybrid data compression technique for change block skipping in an APA printer`.

Affiliated with

Also associated with

Rating

Data compression method and apparatus and data expansion method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data compression method and apparatus and data expansion method , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data compression method and apparatus and data expansion method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1957572