Sharp image interpolation by mapping level curves

Hiêp Quang Luong; Wilfried Philips

doi:10.1117/12.633380

24 June 2005 Sharp image interpolation by mapping level curves

Hiêp Quang Luong, Wilfried Philips

Proceedings Volume 5960, Visual Communications and Image Processing 2005; 59605W (2005) https://doi.org/10.1117/12.633380
Event: Visual Communications and Image Processing 2005, 2005, Beijing, China

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.

Citation Download Citation

Hiêp Quang Luong and Wilfried Philips "Sharp image interpolation by mapping level curves", Proc. SPIE 5960, Visual Communications and Image Processing 2005, 59605W (24 June 2005); https://doi.org/10.1117/12.633380

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available