计算机应用 ›› 2019, Vol. 39 ›› Issue (1): 275-280.DOI: 10.11772/j.issn.1001-9081.2018061230

• 虚拟现实与多媒体计算 • 上一篇    下一篇

基于结构自相似性和形变块特征的单幅图像超分辨率算法

向文, 张灵, 陈云华, 姬秋敏   

  1. 广东工业大学 计算机学院, 广州 511400
  • 收稿日期:2018-06-13 修回日期:2018-08-24 出版日期:2019-01-10 发布日期:2019-01-21
  • 通讯作者: 向文
  • 作者简介:向文(1993-),男,湖南怀化人,硕士研究生,CCF会员,主要研究方向:图像处理、模式识别;张灵(1968-),女,广西南宁人,教授,博士,主要研究方向:数据挖掘、计算机视觉、无线传感网;陈云华(1977-),女,湖北仙桃人,讲师,博士,主要研究方向:计算机视觉、模式识别、深度学习;姬秋敏(1992-),女,山东济宁人,硕士研究生,主要研究方向:图像处理、模式识别。
  • 基金资助:
    广东省自然科学基金面上项目(2016A030313703);广东省自然科学基金资助项目(2016A030313713);广东省科技计划项目(2016B030305002);广东省交通运输厅科技项目(科技-2016-02-030)。

Single image super resolution algorithm based on structural self-similarity and deformation block feature

XIANG Wen, ZHANG Ling, CHEN Yunhua, JI Qiumin   

  1. College of Computer Science, Guangdong University of Technology, Guangzhou Guangdong 511400, China
  • Received:2018-06-13 Revised:2018-08-24 Online:2019-01-10 Published:2019-01-21
  • Supported by:
    This work is partially supported by the Surface Program of National Natural Science Foundation of Guangdong Province (2016A030313703), the Natural Science Foundation of Guangdong Province (2016A030313713), the Science and Technology Program of Guangdong Province (2016B030305002), the Science and Technology Project of Guangdong Provincial Transportation Department (Science and Technology-2016-02-030).

摘要: 针对单幅图像超分辨率(SR)复原样本资源不足和抗噪性差的问题,提出一种基于结构自相似和形变块特征的单幅图像超分辨率算法。首先,该方法通过构建尺度模型,尽可能地扩展搜索空间,克服单幅图像超分辨率训练样本不足的缺陷;接着,通过样例块的几何形变提升了局限性的内部字典大小;最后,为了提升重建图片的抗噪性,利用组稀疏学习字典来重建图像。实验结果表明:与Bicubic、稀疏字典学习(ScSR)算法和基于卷积神经网络的超分辨率(SRCNN)等优秀字典学习算法相比,所提算法可以得到主观视觉效果更为清晰和客观评价更高的超分辨率图像,峰值信噪比(PSNR)平均约提升了0.35 dB。另外所提算法通过几何形变的方式扩展了字典规模和搜索的准确性,在算法时间消耗上平均约减少了80 s。

关键词: 形变块, 块匹配, 字典学习, 自相似性, 组稀疏

Abstract: To solve the problem of insufficient sample resources and poor noise immunity for single image Super Resolution (SR) restoration, a single image super-resolution algorithm based on structural self-similarity and deformation block feature was proposed. Firstly, a scale model was constructed to expand search space as much as possible and overcome the shortcomings of lack of a single image super-resolution training sample. Secondly, the limited internal dictionary size was increased by geometric deformation of sample block. Finally, in order to improve anti-noise performance of reconstructed picture, the group sparse learning dictionary was used to reconstruct image. The experimental results show that compared with the excellent algorithms such as Bicubic, Sparse coding Super Resolution (ScSR) algorithm and Super-Resolution Convolutional Neural Network (SRCNN) algorithm, the super-resolution images with more subjective visual effects and higher objective evaluation can be obtained, the Peak Signal-To-Noise Ratio (PSNR) of the proposed algorithm is increased by about 0.35 dB on average. In addition, the scale of dictionary is expanded and the accuracy of search is increased by means of geometric deformation, and the time consumption of algorithm is averagely reduced by about 80 s.

Key words: deformation block, block matching, dictionary learning, self-similarity, group sparseness

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