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Structure-Aware Color Halftoning with Adaptive Sharpness Control
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Medie- och Informationsteknik. Linköpings universitet, Tekniska fakulteten.
2022 (engelsk)Inngår i: Journal of Imaging Science and Technology, ISSN 1062-3701, E-ISSN 1943-3522, Vol. 66, nr 6, artikkel-id 060404Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Structure-aware halftoning algorithms aim at improving their non-structure-aware version by preserving high-frequency details, structures, and tones and by employing additional information from the input image content. The recently proposed achromatic structure-aware Iterative Method Controlling the Dot Placement (IMCDP) halftoning algorithm uses the angle of the dominant line in each pixels neighborhood as supplementary information to align halftone structures with the dominant orientation in each region and results in sharper halftones, gives a more three-dimensional impression, and improves the structural similarity and tone preservation. However, this method is developed only for monochrome halftoning, the degree of sharpness enhancement is constant for the entire image, and the algorithm is prohibitively expensive for large images. In this paper, we present a faster and more flexible approach for representing the image structure using a Gabor-based orientation extraction technique which improves the computational performance of the structure-aware IMCDP by an order of magnitude while improving the visual qualities. In addition, we extended the method to color halftoning and studied the impact of orientation information in different color channels on improving sharpness enhancement, preserving structural similarity, and decreasing color reproduction error. Furthermore, we propose a dynamic sharpness enhancement approach, which adaptively varies the local sharpness of the halftone image based on different textures across the image. Our contributions in the present work enable the algorithm to adaptively work on large images with multiple regions and different textures. (C) 2022 Society for Imaging Science and Technology.

sted, utgiver, år, opplag, sider
I S & T-SOC IMAGING SCIENCE TECHNOLOGY , 2022. Vol. 66, nr 6, artikkel-id 060404
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-192705DOI: 10.2352/J.ImagingSci.Technol.2022.66.6.060404ISI: 000939908300011OAI: oai:DiVA.org:liu-192705DiVA, id: diva2:1747778
Merknad

Funding Agencies|ApPEARS (Appearance Printing European Advanced Research School); European Unions Horizon 2020 programme under the Marie Sklodowska-Curie grant [814158]

Tilgjengelig fra: 2023-03-31 Laget: 2023-03-31 Sist oppdatert: 2023-09-26
Inngår i avhandling
1. 2D and 3D Halftoning for Appearance Reproduction
Åpne denne publikasjonen i ny fane eller vindu >>2D and 3D Halftoning for Appearance Reproduction
2023 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The appearance of an object is determined by its chromatic and geometric qualities in its surrounding environment using four optical parameters: color, gloss, translucency, and surface texture. Reconstructing the appearance of objects is of great importance in many applications, including creative industries, packaging, fine-art reproduction, medical simulation, and prosthesis-making. Printers are reproduction devices capable of replicating objects’ appearance in 2D and 3D forms. With the introduction of new printing technologies, new inks and materials, and demands for innovative applications, creating accurate reproduction of the desired visual appearance has become challenging. Thus, the appearance reproduction workflow requires improvements and adaptations. 

Accurate color reproduction is a critical quality measure in reproducing the desired appearance in any printing process. However, printers are devices with a limited number of inks that can either print a dot or leave it blank at a specific position on a substrate; hence, to reproduce different colors, optimal placement of the available inks is needed. Halftoning is a technique that deals with this challenge by generating a spatial distribution of the available inks that creates an illusion of the target color when viewed from a sufficiently large distance. Halftoning is a fundamental part of the color reproduction task in any full-color printing pipeline, and it is an effective technique to increase the potential of printing realistic and complex appearances. Although halftoning has been used in 2D printing for many decades, it still requires improvements in reproducing fine details and structures of images. Moreover, the emergence of new technologies in 3D printing introduces a higher degree of freedom and more parameters to the field of appearance reproduction. Therefore, there is a critical need for extensive studies to revisit existing halftoning algorithms and develop novel approaches to produce high quality prints that match the target appearance faithfully. This thesis aims at developing halftoning algorithms to improve appearance reproduction in 2D and 3D printing. 

Contributions of this thesis in the 2D domain is a dynamic sharpness-enhancing halftoning approach, which adaptively varies the local sharpness of the halftone image based on different textures in the original image for realistic appearance printing. The results show improvements in halftone quality in terms of sharpness, preserving structural similarity, and decreasing color reproduction error. The main contribution of this thesis in 3D printing is extending a high quality 2D halftoning algorithm to the 3D domain. The proposed method is then integrated with a multi-layer printing approach, where ink is deposited at variable depths to improve the reproduction of tones and fine details. Results demonstrate that the proposed method accurately reproduces tones and details of the target appearance. Another contribution of this thesis is studying the effect of halftoning on the perceived appearance of 3D printed surfaces. According to the results, changing the dot placement based on the elevation variation of the underlying geometry can potentially control the perception of the 3D printed appearance. It implies that the choice of halftone may prove helpful in eliminating unwanted artifacts, enhancing the object’s geometric features, and producing a more accurate 3D appearance. The proposed methods in this thesis have been evaluated using different printing techniques.    

sted, utgiver, år, opplag, sider
Linköping: Linköping University Electronic Press, 2023. s. 57
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 2331
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-198137 (URN)10.3384/9789180752701 (DOI)9789180752695 (ISBN)9789180752701 (ISBN)
Disputas
2023-10-26, K3, Kåkenhus, Campus Norrköping, Norrköping, 10:15 (engelsk)
Opponent
Veileder
Merknad

2023-10-09: The cover was updated to reflect the printed version. 

Before this date the PDF has been downloaded 45 times.

Tilgjengelig fra: 2023-09-26 Laget: 2023-09-26 Sist oppdatert: 2023-10-09bibliografisk kontrollert

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