Tone dependent error diffusion
A tone dependent error diffusion halftoning system uses tone dependent thresholds and error weightings that are optimized by minimizing a model based cost function. An upper and lower threshold are used to compare with the modified pixel value. If the modified pixel value is greater than the upper t...
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Main Authors | , |
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Format | Patent |
Language | English French German |
Published |
08.11.2000
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Abstract | A tone dependent error diffusion halftoning system uses tone dependent thresholds and error weightings that are optimized by minimizing a model based cost function. An upper and lower threshold are used to compare with the modified pixel value. If the modified pixel value is greater than the upper threshold, a dot is printed, if less than the lower threshold, no dot is printed, and if between, a binary bitmap is used to determine whether a dot should be printed. For each midtone threshold level, a halftone image is generated by a direct binary search method and an error diffusion method. The magnitudes of the fast Fourier transforms, of the halftone images are compared using a visual cost function and the thresholds and error weightings are altered to minimize the cost function. For highlight and shadow tone levels, a filtered halftone image from an error diffusion system is compared to the continuous tone image after filtering the image via a human visual system model. Again by minimizing the cost function, the thresholds and error weightings are optimized. |
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AbstractList | A tone dependent error diffusion halftoning system uses tone dependent thresholds and error weightings that are optimized by minimizing a model based cost function. An upper and lower threshold are used to compare with the modified pixel value. If the modified pixel value is greater than the upper threshold, a dot is printed, if less than the lower threshold, no dot is printed, and if between, a binary bitmap is used to determine whether a dot should be printed. For each midtone threshold level, a halftone image is generated by a direct binary search method and an error diffusion method. The magnitudes of the fast Fourier transforms, of the halftone images are compared using a visual cost function and the thresholds and error weightings are altered to minimize the cost function. For highlight and shadow tone levels, a filtered halftone image from an error diffusion system is compared to the continuous tone image after filtering the image via a human visual system model. Again by minimizing the cost function, the thresholds and error weightings are optimized. |
Author | ALLEBACH, JAN P LI, PINGSHAN |
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Discipline | Medicine Chemistry Sciences Physics |
DocumentTitleAlternate | Tonabhängige Fehlerdiffusion Diffusion d'erreurs dépendant de la tonalité |
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Snippet | A tone dependent error diffusion halftoning system uses tone dependent thresholds and error weightings that are optimized by minimizing a model based cost... |
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SubjectTerms | CALCULATING COMPUTING COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY IMAGE DATA PROCESSING OR GENERATION, IN GENERAL PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION |
Title | Tone dependent error diffusion |
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