A novel halftoning approach that has embedded in it a model for the electrophotographic process is presented. Models for the laser beam, exposure of the organic photo-conductor, and the resulting absorptance on the paper are embedded into the Direct Binary Search halftoning algorithm. The algorithm is applicable to any arbitrary pixel modulation scheme and is also highly portable between different electrophotographic print engines. Computational issues are addressed to make the approach viable. Results show good exploitation of pixel modulation and improvement over DBS with no printer model.
With the advent of high resolution (1200+ dpi) desktop printers, the use of conventional 128 by 128 screens can produce a distinctive periodicity in the printed images. A new method for design of multiple 32 by 32 screens using direct binary search and training is proposed. The screens are seamless with each other; and a small number of these screens are randomly tiled over the entire support of the continuous- tone image. These are then used to threshold the image to create the halftone image. Due to the random tiling of the screens, the resulting halftones do not have any periodicity in them. The resulting screens also have lower memory requirements than 128 by 128 screens. Experimental results also show that the exact order of the screens is not crucial to the quality of the final halftone. Therefore, no additional information about the ordering of the multiple screens needs to be stored.
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Digital Publishing
16 January 2006 | San Jose, California, United States
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