Redefining A in RGBA

Author:

Urban Philipp1,Tanksale Tejas Madan2,Brunton Alan2,Vu Bui Minh3,Nakauchi Shigeki3

Affiliation:

1. Fraunhofer Institute for Computer Graphic Research IGD and Norwegian University of Science and Technology NTNU

2. Fraunhofer Institute for Computer Graphic Research IGD, Fraunhoferstr, Darmstadt, Germany

3. Department of Computer Science and Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi, Japan

Abstract

Advances in multimaterial 3D printing have the potential to reproduce various visual appearance attributes of an object in addition to its shape. Since many existing 3D file formats encode color and translucency by RGBA textures mapped to 3D shapes, RGBA information is particularly important for practical applications. In contrast to color (encoded by RGB), which is specified by the object’s reflectance, selected viewing conditions, and a standard observer, translucency (encoded by A ) is neither linked to any measurable physical nor perceptual quantity. Thus, reproducing translucency encoded by A  is open for interpretation. In this article, we propose a rigorous definition for A  suitable for use in graphical 3D printing, which is independent of the 3D printing hardware and software, and which links both optical material properties and perceptual uniformity for human observers. By deriving our definition from the absorption and scattering coefficients of virtual homogenous reference materials with an isotropic phase function, we achieve two important properties. First, a simple adjustment of A  is possible, which preserves the translucency appearance if an object is rescaled for printing. Second, determining the value of A  for a real (potentially non-homogenous) material, can be achieved by minimizing a distance function between light transport measurements of this material and simulated measurements of the reference materials. Such measurements can be conducted by commercial spectrophotometers used in graphic arts. Finally, we conduct visual experiments employing the method of constant stimuli, and we derive from them an embedding of A  into a nearly perceptually uniform scale of translucency for the reference materials.

Funder

AIF IGF

EU Horizon 2020 Framework Programme

Fraunhofer Internal Programs

JSPS KAKENHI

Leading Graduate School Program

Publisher

Association for Computing Machinery (ACM)

Subject

Computer Graphics and Computer-Aided Design

Reference43 articles.

1. 3MF Consortium. 2015a. 3MF file format specification. Retrieved from http://3mf.io/specification/. 3MF Consortium. 2015a. 3MF file format specification. Retrieved from http://3mf.io/specification/.

2. 3MF Consortium. 2015b. 3MF Materials and Properties Extension. Retrieved from http://3mf.io/specification/. 3MF Consortium. 2015b. 3MF Materials and Properties Extension. Retrieved from http://3mf.io/specification/.

3. The distribution of reflectances within the visual environment

Cited by 26 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Automated and Context-Aware Repair of Color-Related Accessibility Issues for Android Apps;Proceedings of the 31st ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering;2023-11-30

2. Appearance Beyond Colour;Fundamentals and Applications of Colour Engineering;2023-10-11

3. The Inner Complexities of Multimodal Medical Data: Bitmap-Based 3D Printing for Surgical Planning Using Dynamic Physiology;3D Printing and Additive Manufacturing;2023-10-01

4. Cuttlefish: Pushing the Limits of Graphical 3-D Printing;IEEE Computer Graphics and Applications;2023-09-01

5. Skin-Screen: A Computational Fabrication Framework for Color Tattoos;ACM Transactions on Graphics;2023-07-26

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3