Selective Sampling and Optimal Filtering for Subpixel-Based Image Down-Sampling
- Authors
- Chae, Sung-Ho; Kim, Sung-Tae; Kim, Joon-Yeon; Yoo, Cheol-Hwan; Ko, Sung-Jea
- Issue Date
- 2019
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Aliasing; color-fringing; frequency domain analysis; image down-sampling; optimal filtering; selective sampling; subpixel rendering
- Citation
- IEEE ACCESS, v.7, pp.124096 - 124105
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE ACCESS
- Volume
- 7
- Start Page
- 124096
- End Page
- 124105
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/68885
- DOI
- 10.1109/ACCESS.2019.2938255
- ISSN
- 2169-3536
- Abstract
- Subpixel-based image down-sampling has been widely used to improve the apparent resolution of down-sampled images on display. However, previous subpixel rendering methods often introduce distortions, such as aliasing and color-fringing. This study proposes a novel subpixel rendering method that uses selective sampling and optimal filtering. We first generalize the previous frequency domain analysis results indicating the relationships between various down-sampling patterns and the aliasing artifact. Based on this generalized analysis, a subpixel-based down-sampling pattern for each image is selectively determined by utilizing the edge distribution of the image. Moreover, we investigate the origin of the color-fringing artifact in the frequency domain. Optimal spatial filters that can effectively remove distortions caused by the selected down-sampling pattern are designed via frequency domain analyses of aliasing and color-fringing. The experimental results show that the proposed method is not only robust to the aliasing and color-fringing artifacts but also outperforms the existing ones in terms of information preservation.
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- Appears in
Collections - College of Engineering > School of Electrical Engineering > 1. Journal Articles
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