Daniel A Greene

Author:

Daniel H. Greene

ISBN #:

0817635157

Author:

Daniel H. Greene

ISBN #:

3764335157

Author:

Daniel Greene

ISBN #:

0823039013

Author:

Daniel Greene

ISBN #:

0823038998

US Patent:

59307900, Jul 27, 1999

Filed:

Sep 25, 1997

Appl. No.:

8/937554

Inventors:

Simon M. Law - Torrance CA
Daniel H. Greene - Sunnyvale CA
Li-Fung Cheung - Alhambra CA

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G06F 1730

US Classification:

707 6

Abstract:

A circuit for implementing a substitutional compressor. Comparators compare a current input pixel against a large number of previous pixels, the "history", stored in a series of shift registers. Each register and associated comparator constitutes a cell. If one or more matches are found the history data is shifted one pixel, the non-matching cells are disabled, and the next input pixel is compared against the contents of the same cells that had the previous matches. The matching is terminated when the longest series of matching pixels is found. The output code is then the length of the matching series of pixels, and the displacement of the first input pixel from the first matching pixel. An encoder generates an initialize signal that resets all of the disabled cells on the same clock cycle on which the output code word is generated. To make the circuit more compact, the cells can be arranged into a square format with one output line for each row and column from the cells to the encoder.

US Patent:

D2701693, Aug 16, 1983

Filed:

Jun 12, 1980

Appl. No.:

6/146696

Inventors:

Daniel H. Greene - Encino CA
Lawrence J. Greene - Foster City CA

International Classification:

D1907

US Classification:

D19 59

US Patent:

40559084, Nov 1, 1977

Filed:

Apr 15, 1976

Appl. No.:

5/677322

Inventors:

Daniel H. Greene - Encino CA
Lawrence J. Greene - Foster City CA

International Classification:

G09B 1702

US Classification:

35 35R

Abstract:

A shutter is slidingly mounted in a frame which exposes a single line of words on a page of printed material. The shutter may be moved from left to right across the exposed line exposing words, syllables or the like sequentially.