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11 March 2005 A real-time multiresolution algorithm for correcting distortions produced by thermal printers
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Proceedings Volume 5674, Computational Imaging III; (2005)
Event: Electronic Imaging 2005, 2005, San Jose, California, United States
As printing proceeds in a thermal printer, heat from previously printed lines of image data accumulates in the print head and alters the thermal state of the heating elements. This fluctuating state of the heating elements manifests itself as a distortion in the printed image. We have modeled the heat diffusion within the thermal printer and the density response of the receiver medium to derive a computationally efficient inverse thermal printer model. In this model, the heat diffusion problem for the moving receiver is simplified by showing that it is equivalent to a stationary medium with lower conductivity. The thermal print head is modeled as having a finite number of discrete layers with differing time constants. The layer temperature updates can be decoupled and are time recursive if expressed in relative rather than absolute temperatures, and this decoupling allows the layers to be updated at multiple spatial and temporal resolutions. The inverse printer model then reduces to an elegant algorithm that comprises three interleaved recursions; namely, absolute temperature propagation from coarse-to-fine scale, energy propagation from fine-to-coarse scale and relative temperature update in time. Experimental results demonstrate that the proposed algorithm successfully corrects the distortion produced by thermal printers.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Suhail S. Saquib and William T. Vetterling "A real-time multiresolution algorithm for correcting distortions produced by thermal printers", Proc. SPIE 5674, Computational Imaging III, (11 March 2005);


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