Printer models and colo halftoning

Pappas, Thrasyvoulos N.

doi:10.1109/icassp.1993.319815

Cited by 8 publications

(10 citation statements)

References 6 publications

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“…I1 k\+ (2) Where W(k,l) is the rate of diagonal against horizontal and vertical 1: X-I and the sum of coefficients is normalized as 1.…”

Section: A Information Ofedge Enhancementmentioning

confidence: 99%

“…When it applies to color images, it reproduces average color shade which is close to color of the area. To apply error diffusion of the gray images to color images, Pappas, etc, [2] and Akarun, etc, [3] have suggested the method that generates color halftone images by regarding each color component as an gray image. This method is called scalar error diffusion, which reproduces another color finally after errors have been accumulated.…”

Section: Introductionmentioning

confidence: 99%

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Edge Enhancement Color Halftoning by Using IEE

Kwak

Kwon

Kim

et al. 2006

2006 International Forum on Strategic Technology

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Among the digital halftoning, the error diffusion halftoning gives better subjective quality than other halftoning techniques. But it also makes edges of objects blurred. To overcome the defect, this thesis proposes the modified error diffusion halftoning algorithm to enhance the edges using the spatial perceptual properties of the human visual system. Using the properties that the human eyes perceive not the pixel's luminance itself but the local average luminance and that information that human eyes perceive spatial variation, the proposed method computes information of edge enhancement(IEE). The IEE is added to the quantizer's input pixel and feeds into the halftoning quantizer. The quantizer produces the halftone image having the enhanced edge. Also this thesis proposes the technique that the coefficients of the error diffusion filter are adapted according to the correlation among color components. The computer simulation results show that the proposed method produces finer halftoning images than conventional methods due to the enhanced edges. And the proposed method also preserves similar in edges to original image and reduces some defects such as color impulse and false contours.

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“…I1 k\+ (2) Where W(k,l) is the rate of diagonal against horizontal and vertical 1: X-I and the sum of coefficients is normalized as 1.…”

Section: A Information Ofedge Enhancementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Edge Enhancement Color Halftoning by Using IEE

Kwak

Kwon

Kim

et al. 2006

2006 International Forum on Strategic Technology

View full text Add to dashboard Cite

show abstract

“…1,2 One of the main drawbacks of halftoning techniques is the poor spatial resolution, which is caused from dither matrices. [4][5][6][7][8][9][10] Currently, color printers are widely used and there are efforts to improve the significant problem in color printers of the spreading of inks, which generates ''color distortions'' by dot overlap. [4][5][6][7][8][9][10] Currently, color printers are widely used and there are efforts to improve the significant problem in color printers of the spreading of inks, which generates ''color distortions'' by dot overlap.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9][10] Currently, color printers are widely used and there are efforts to improve the significant problem in color printers of the spreading of inks, which generates ''color distortions'' by dot overlap. 6 Recently, the model-based approaches using Pappas's printer model 5,6 have been exploited by several authors. 5 He also treated the imperfect ink case and showed examples that dot size is & times the ideal pixel size.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the CIE 1976 L*a*b*, which is referred to as LAB in the following sections, will be used as the standard color space for color facsimile in the future, 14 and it must characterize color devices in terms of a standard color space in the color management system. In these algorithms, we use the color model from Pappas's printer model, which includes a color model and a printer model, 5,6 to analyze color correction effects in terms of the standard color space LAB. 1 We have shown the algorithm structure and an initial result that shows image quality could be improved by adopting the perceptually uniform color space LAB in the model-based approach.…”

Section: Introductionmentioning

confidence: 99%

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Color and printer models for color halftoning

Kim

Kweon²,

Seo

1997

J. Electron. Imaging

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Two error diffusion algorithms, based on Pappas's printer model accounting for dot-overlapping and ink distortion, are presented to achieve good color reproduction. The basic idea is to combine printer and color models on the perceptually uniform Commission Internationale de I'Eclairge (CIE) L*a*b* (CIE 1976) color space. The models, derived from the Neugebauer equations and color matching theories, are designed to achieve the minimization of the human visual color distortions between the colors of original pixels and those of a halftoned image. The effectiveness of our approaches is shown by comparison and examination of two error diffusion algorithms with previous methods: the error diffusion based models and the window based minimization algorithm. Experimental results of the error clipping technique, focused on the real application of the nonseparable algorithm, and the desired range of error clipping, where an image produced by the nonseparable algorithm can be stable without additional color distortion, are reported. © 1997 SPIE and IS&T. [S1017-9909(97) 00102-5]Paper 95-010

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Algorithms of halftoning color images with edge enhancement

Lai¹,

Chen²

2003

Journal of Visual Communication and Image Representation

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Printer models and colo halftoning

Cited by 8 publications

References 6 publications

Edge Enhancement Color Halftoning by Using IEE

Edge Enhancement Color Halftoning by Using IEE

Color and printer models for color halftoning

Algorithms of halftoning color images with edge enhancement

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