Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1996-09-05
1999-04-27
Coles, Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358455, 358456, 358465, 358466, 382270, H04M 140, G06K 936, G06F 1500
Patent
active
058988203
ABSTRACT:
A method of halftoning a sample value from an intensity range including the steps of providing threshold arrays having threshold values from distinct ranges, one of which is the same as the intensity range, selecting the one with the same range as the intensity range and using the selected threshold array to halftone the sample value. Embodiments may include the following features. The threshold arrays are a first one having a first threshold value range and a second one having a second threshold value range that has more levels than does the first threshold value range. The first threshold array is built by scaling each value in the second threshold array down to the range of the first threshold array. The scaling is done by dividing by 257 and rounding up to the next whole number. The first threshold array has a threshold value range of zero to 255 and the second threshold array has a threshold value range of zero to 65535 or zero to 4095. Tone correction is performed using a transfer function mapping an 8-bit input sample value to a tone-corrected output sample value having more than 8 bits.
REFERENCES:
patent: 5053887 (1991-10-01), Thompson
patent: 5216753 (1993-06-01), Ng
patent: 5444551 (1995-08-01), Miller et al.
patent: 5489991 (1996-02-01), McMurray
patent: 5555102 (1996-09-01), Dalton
Borg Lars
Sherwood Geoffrey C.
Adobe Systems Incorporated
Coles Edward L.
Wallerson Mark
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