Name
Abstract | ||
|---|---|---|
The standard interpolation approach to image resizing is to fit the original picture with a continuous model and resample the function at the desired rate. However, one can obtain more accurate results if one applies a filter prior to sampling, a fact well known from sampling theory. The optimal solution corresponds to an orthogonal projection onto the underlying continuous signal space. Unfortunately, the optimal projection prefilter is difficult to implement when sine or high order spline functions are used. We propose to resize the image using an oblique rather than an orthogonal projection operator in order to make use of faster, simpler, and more general algorithms. We show that we can achieve almost the same result as with the orthogonal projection provided that we use the same approximation space. The main advantage is that it becomes perfectly feasible to use higher order models (e.g. splines of degree n=or>3). We develop the theoretical background and present a simple and practical implementation procedure using B-splines. Our experiments show that the proposed algorithm consistently outperforms the standard interpolation methods and that it provides essentially the same performance as the optimal procedure (least squares solution) with considerably fewer computations. The method works for arbitrary scaling factors and is applicable to both image enlargement and reduction. |
Year | DOI | Venue |
|---|---|---|
1998 | 10.1109/83.668025 | IEEE Transactions on Image Processing |
Keywords | Field | DocType |
oblique projection operator,approximation space,orthogonal projection,image scaling magnification and reduction,image resizing,optimal procedure,resam- pling.,high-quality image,high order spline function,optimal projection prefilter,orthogonal projection operator,image enlargement,index terms— b-spline models,oblique projection,higher order model,optimal solution corresponds,generic algorithm,indexing terms,least squares approximation,higher order,resampling,spline,computational complexity,approximation algorithms,interpolation,continuous model,b splines,digital images,spline function | Oblique projection,Spline (mathematics),B-spline,Least squares,Continuous signal,Orthographic projection,Interpolation,Image processing,Artificial intelligence,Computer vision,Mathematical optimization,Algorithm,Mathematics | Journal |
Volume | Issue | ISSN |
7 | 5 | 1057-7149 |
Citations | PageRank | References |
28 | 5.41 | 14 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Chulhee Lee | 1 | 454 | 86.37 |
| M Eden | 2 | 28 | 5.41 |
| Unser, M. | 3 | 3438 | 442.40 |