Method to convert bitmaps to monochrome data

Details Method to convert bitmaps to monochrome data Method to convert bitmaps to monochrome data

1992-10-13

1995-10-10

Powell, Mark R.

H04N 140

Patent

active

054577721

ABSTRACT:
A peripheral unit converts source color image data to a rasterized monochrome bit map and includes a random access memory, a storage memory containing a gray scale conversion table, dithering matrices, procedures for determining destination image dithering tiling locations, scaling conversion procedures and sub routines for establishing a gray scale value array index to a bit mask array. The peripheral unit performs a method of converting color source image data to a rasterized compressed monochrome bit map which involves a conversion cycle for converting source pixels to gray scale value and output position bits within the two arrays. Testing is performed to determine all of the source pixels converted to the same gray scale value, and if so, a read ahead cycle commences, reading ahead in the source pixel row for as long as the unconverted source image color data bytes are the same as for those converted in the conversion cycle. The converted output position bits of the converted source pixels are dithered, and an attempt is made to generate a compressed data repeated run entry with a default to a literal run entry based upon dithering of only the converted source pixel output position bits and a count of repeating source pixels.

REFERENCES:
patent: 4977398 (1990-12-01), Pleva et al.
patent: 5153651 (1992-10-01), Kurotaka
patent: 5245327 (1993-09-01), Pleva et al.
patent: 5307135 (1994-04-01), Amakawa et al.
patent: 5323247 (1994-06-01), Parker et al.

Affiliated with

Also associated with

Rating

Method to convert bitmaps to monochrome data does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method to convert bitmaps to monochrome data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method to convert bitmaps to monochrome data will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2316097