Grayscale printing with sliding window memory
First Claim
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1. A method of exposing pixels of a photoconductive drum for printing a grayscale image, comprising the steps of:
- storing an array of exposure data in a sliding window memory, said sliding window memory having a predetermined number of addressable rows, each of said rows for storing a row of said array of exposure data;
generating a microimage on said drum, by addressing elements of a pixel array imaging device in accordance with said array of exposure data;
decrementing said exposure data to account for said microimage;
readdressing each row of said array of exposure data to a next row of said sliding window memory;
addressing a new row of exposure data as a last row of said sliding window memory;
repeating said generating, decrementing, readdressing, and addressing steps until all of said image is exposed.
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Abstract
A method for printing grayscale images. A sliding window memory stores an array of exposure data. The memory is initialized (80) with zero values. The memory is then addressed (82) so that the last row of the array is filled with exposure data. A microimage is then generated based on the exposure data (84). The data in the array is then decremented (86). If the page to be printed is not completed, the array'"'"'s addresses are rotated (82) so that the data for the first row drops out, the data for other rows is readdressed as the next row, and new data fills the last row.
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11 Claims
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1. A method of exposing pixels of a photoconductive drum for printing a grayscale image, comprising the steps of:
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storing an array of exposure data in a sliding window memory, said sliding window memory having a predetermined number of addressable rows, each of said rows for storing a row of said array of exposure data; generating a microimage on said drum, by addressing elements of a pixel array imaging device in accordance with said array of exposure data; decrementing said exposure data to account for said microimage; readdressing each row of said array of exposure data to a next row of said sliding window memory; addressing a new row of exposure data as a last row of said sliding window memory; repeating said generating, decrementing, readdressing, and addressing steps until all of said image is exposed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification