An Region Adaptive Image Interpolation Algorithm Based on the NSCT

被引：0

作者：

Fan Q. ^{[1
,2
,3
]}

Zhang Y. ^{[1
,2
,3
]}

Bao F. ^{[4
]}

Shen X. ^{[1
,2
,3
]}

Yao X. ^{[1
,2
,3
]}

机构：

[1] School of Computer Science & Technology, Shandong University of Finance and Economics, Jinan

[2] Shandong Provincial Key Laboratory of Digital Media Technology, Jinan

[3] Economic Operation and Dynamic Simulation Key Laboratory of Shandong Colleges and Universities, Jinan

[4] School of Mathematics, Shandong University, Jinan

来源：

Jisuanji Yanjiu yu Fazhan/Computer Research and Development | 2018年 / 55卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Adaptive; Edge-directed interpolation (EDI); Image interpolation; Nonsubsampled contourlet transform (NSCT); Rational function interpolation;

D O I：

10.7544/issn1000-1239.2018.20160942

中图分类号：

学科分类号：

摘要：

Image interpolation plays a vital role in digital image processing. In order to preserve image texture detail and edge sharpness, a new method of region adaptive image interpolation based on NSCT (nonsubsampled contourlet transform) is proposed. Image is divided into different regions and interpolated by different methods respectively. Firstly, a new type of C2 continuous rational function interpolation model is constructed, and the error estimates are given. Secondly, image edge contour information is captured by the NSCT, and the image is divided into edge region and non-edge region adaptively according to a preset threshold. Finally, as for edge region, edge-directed interpolation technique is used to get high resolution image. Similarly, rational function interpolation algorithm is used in non-edge region. The objective image with higher resolution ratio than the input image is obtained by adaptive interpolation. Compared with the classical image interpolation algorithm, the proposed method is highly competitive not only in PSNR (peak signal to noise ratio) and SSIM (structural similarity index) but also in visual effect. Experimental results show that the proposed algorithm not only has lower time complexity, but also can preserve image details, eliminate phenomenon of edge aliasing, and have a high quality of interpolation image. © 2018, Science Press. All right reserved.

引用

页码：629 / 642

页数：13

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