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A Study of Image Upsampling and Downsampling Filters

Department of Computer Science & Engineering, Faculty of Automatic Control & Computers, Politehnica University of Bucharest, RO-060042 Bucharest, Romania
Author to whom correspondence should be addressed.
Computers 2019, 8(2), 30;
Received: 21 March 2019 / Revised: 14 April 2019 / Accepted: 19 April 2019 / Published: 23 April 2019
PDF [2353 KB, uploaded 29 June 2019]


In this paper, a set of techniques used for downsampling and upsampling of 2D images is analyzed on various image datasets. The comparison takes into account a significant number of interpolation kernels, their parameters, and their algebraical form, focusing mostly on linear interpolation methods with symmetric kernels. The most suitable metrics for measuring the performance of upsampling and downsampling filters’ combinations are presented, discussing their strengths and weaknesses. A test benchmark is proposed, and the obtained results are analyzed with respect to the presented metrics, offering explanations about specific filter behaviors in general, or just in certain circumstances. In the end, a set of filters and parameters recommendations is offered based on extensive testing on carefully selected image datasets. The entire research is based on the study of a large set of research papers and on a solid discussion of the underlying signal processing theory. View Full-Text
Keywords: image processing; upsampling; downsampling; filters; interpolation; signal processing image processing; upsampling; downsampling; filters; interpolation; signal processing

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Dumitrescu, D.; Boiangiu, C.-A. A Study of Image Upsampling and Downsampling Filters. Computers 2019, 8, 30.

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