Method and apparatus for converting image representation formats

Facsimile and static presentation processing – Facsimile – Recording apparatus

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358447, 3582611, H04N 140

Patent

active

057267600

ABSTRACT:
A method and apparatus that convert a series of drawing instructions, suitable for assigning pixel values corresponding to the drawing instructions to an image arranged in rows and columns of pixels, to a series of runlengths and corresponding pixel values. A runlength represents the number of successive pixels with mutual identical pixel values while the series of runlengths and pixel values is arranged according to a first order as determined by successive pixel positions. The runlengths of the pixel values (as generated by the drawing instructions) are determined in a second order which is different from the first order. Consequently, the insert positions of these runlengths are determined on the basis of pixel positions which correspond with said determined runlengths. On the basis of these insert positions, the determined runlengths are inserted in the series of runlengths so that runlengths in the series (which have positions in common with the runlengths to be inserted) are modified in dependance on the runlengths and pixel values to be inserted.

REFERENCES:
patent: 4542413 (1985-09-01), Rallapalli et al.
patent: 5040073 (1991-08-01), Renelt et al.
patent: 5552832 (1996-09-01), Astle

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