Normal manipulation for bas-relief modeling

Ji, Zhongping, Sun, Xianfang ORCID: https://orcid.org/0000-0002-6114-0766, Zhang, Yu-Wei, Ma, Weiyin and Wei, Mingqiang 2021. Normal manipulation for bas-relief modeling. Graphical Models 114 , 101099. 10.1016/j.gmod.2021.101099

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Abstract

We introduce a normal-based modeling framework for bas-relief generation and stylization which is motivated by the recent advancement in this topic. Creating bas-relief from normal images has successfully facilitated bas-relief modeling in image space. However, the use of normal images in previous work is restricted to the cut-and-paste or blending operations of layers. These operations simply treat a normal vector as a pixel of a general color image. This paper is intended to extend normal-based methods by processing the normal image from a geometric perspective. Our method can not only generate a new normal image by combining various frequencies of existing normal images and details transferring, but also build bas-reliefs from a single RGB image and its edge-based sketch lines. In addition, we introduce an auxiliary function to represent a smooth base surface or generate a layered global shape. To integrate above considerations into our framework, we formulate the bas-relief generation as a variational problem which can be solved by a screened Poisson equation. One important advantage of our method is that it can generate more styles than previous methods and thus it expands the bas-relief shape space. We experimented our method on a range of normal images and it compares favorably to other popular classic and state-of-the-art methods.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Computer Science & Informatics
Publisher:	Elsevier
ISSN:	1524-0703
Funders:	EPSRC
Date of Acceptance:	26 January 2021
Last Modified:	10 Nov 2022 10:28
URI:	https://orca.cardiff.ac.uk/id/eprint/146924

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