Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2006-06-06
2006-06-06
Nguyen, Lamson D (Department: 2861)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S426010, C358S296000, C382S245000
Reexamination Certificate
active
07057770
ABSTRACT:
An improved method of encoding and compressing digital halftones that utilizes a “none-of-the-above” method for designating variable-length runs. A monochrome input bitmap is rearranged slightly to reduce the patterns possible in contained digital halftone cells. This revised monochrome bitmap is parsed into subfiles to optimize run-lengths. The parsed subfiles are combined into a single file whose alternating runs of 1's and 0's are converted into successive variable-length binary numbers. One of the permutations of an antecedent binary is designated “none-of-the-above” and its use triggers a subsequent variable-length binary. All other permutations within each variable-length binary may designate a specific contained run-length and such use triggers a return to the initial binary in the series. The above method is reversed to decode and uncompress the encoded file to reproduce the original revised monochrome bitmap for display by a computer monitor or printer.
REFERENCES:
patent: 5991340 (1999-11-01), Isomura
patent: 6608928 (2003-08-01), Queiroz
patent: 6741368 (2004-05-01), Hoel
Villarreal, “Quality and Compressibility Analysis of Checker Board-Based Digital Halftoning Algorithms” Thesis, Master of Science in Computer Science, Southwest Texas State University, 2002, pp. 57-60.
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