Bas-relief generation using adaptive histogram equalization

Sun, Xianfang ORCID: https://orcid.org/0000-0002-6114-0766, Rosin, Paul L. ORCID: https://orcid.org/0000-0002-4965-3884, Martin, Ralph Robert and Langbein, Frank Curd ORCID: https://orcid.org/0000-0002-3379-0323 2009. Bas-relief generation using adaptive histogram equalization. IEEE Transactions on Visualization and Computer Graphics 15 (4) , pp. 642-653. 10.1109/TVCG.2009.21

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Abstract

An algorithm is presented to automatically generate bas-reliefs based on adaptive histogram equalization (AHE), starting from an input height field. A mesh model may alternatively be provided, in which case a height field is first created via orthogonal or perspective projection. The height field is regularly gridded and treated as an image, enabling a modified AHE method to be used to generate a bas-relief with a user-chosen height range. We modify the original image-contrast-enhancement AHE method to use gradient weights also to enhance the shape features of the bas-relief. To effectively compress the height field, we limit the height-dependent scaling factors used to compute relative height variations in the output from height variations in the input; this prevents any height differences from having too great effect. Results of AHE over different neighborhood sizes are averaged to preserve information at different scales in the resulting bas-relief. Compared to previous approaches, the proposed algorithm is simple and yet largely preserves original shape features. Experiments show that our results are, in general, comparable to and in some cases better than the best previously published methods.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Computer Science & Informatics
Subjects:	Q Science > QA Mathematics > QA76 Computer software
Uncontrolled Keywords:	Bas-relief, adaptive histogram equalization, feature enhancement.
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	1077-2626
Last Modified:	17 Oct 2022 09:42
URI:	https://orca.cardiff.ac.uk/id/eprint/5276

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