Share Email Print

Proceedings Paper

Sharp image interpolation by mapping level curves
Author(s): Hiêp Quang Luong; Wilfried Philips
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

In this paper we describe a novel approach to image interpolation while preserving sharp edge information. Many interpolation methods already have been proposed in the literature, but suffer from one or more artifacts such as aliasing, blurring, ringing etc. Non-linear methods or edge-directed methods result in sharp interpolated images but often look segmented or have great visual degradation in fine structured textures. We concentrate in this paper on tackling blurred edges by mapping the image's level curves. Image's level curves or isophotes are spatial curves with a constant intensity level. The mapping of these intensity levels can be seen as a local contrast enhancement problem, therefore we can rely on some contrast enhancement techniques. A great advantage of this approach is that the shape of the level curves (and of the objects) are preserved and no explicit edge detection is needed here. Additional constraints in function of the image interpolation are defined in this flexible framework. Different strategies of extending greyscale interpolation to colour images are also discussed in this paper. The results show a large improvement in visual quality: the edges are sharper and ringing effects are removed.

Paper Details

Date Published: 24 June 2005
PDF: 11 pages
Proc. SPIE 5960, Visual Communications and Image Processing 2005, 59605W (24 June 2005); doi: 10.1117/12.633380
Show Author Affiliations
Hiêp Quang Luong, Univ. of Ghent (Belgium)
Wilfried Philips, Univ. of Ghent (Belgium)

Published in SPIE Proceedings Vol. 5960:
Visual Communications and Image Processing 2005
Shipeng Li; Fernando Pereira; Heung-Yeung Shum; Andrew G. Tescher, Editor(s)

© SPIE. Terms of Use
Back to Top