Journal of Computer Applications ›› 2017, Vol. 37 ›› Issue (8): 2313-2318.DOI: 10.11772/j.issn.1001-9081.2017.08.2313

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Adaptive bi-lp-l2-norm based blind super-resolution reconstruction for single blurred image

LI Tao, HE Xiaohai, TENG Qizhi, WU Xiaoqiang   

  1. College of Electronics and Information Engineering, Sichuan University, Chengdu Sichuan 610065, China
  • Received:2016-12-23 Revised:2017-02-15 Online:2017-08-10 Published:2017-08-12
  • Supported by:
    This work is partially supported by the National Natural Science Foundation of China (61471248).

基于自适应双lp-l2范数的单幅模糊图像超分辨率盲重建

李滔, 何小海, 滕奇志, 吴小强   

  1. 四川大学 电子信息学院, 成都 610065
  • 通讯作者: 何小海
  • 作者简介:李滔(1983-),女,四川资阳人,博士研究生,主要研究方向:图像超分辨率重建、图像复原;何小海(1964-),男,四川绵阳人,教授,博士,主要研究方向:图像处理、模式识别、图像通信;滕奇志(1962-),女,四川成都人,教授,博士,主要研究方向:图像处理、模式识别、三维重建;吴小强(1971-),男,四川成都人,高级工程师,硕士,主要研究方向:图像处理、数据库系统、嵌入式系统。
  • 基金资助:
    国家自然科学基金资助项目(61471248)。

Abstract: An adaptive bi-lp-l2-norm based blind super-resolution reconstruction method was proposed to improve the quality of a low-resolution blurred image, which includes independent blur-kernel estimation sub-process and non-blind super-resolution reconstruction sub-process. In the blur-kernel estimation sub-process, the bi-lp-l2-norm regularization was imposed on both the sharp image and the blur-kernel. Moreover, by introducing threshold segmentation of image gradients, the lp-norm and the l2-norm constraints on the sharp image were adaptively combined. With the estimated blur-kernel, the non-blind super-resolution reconstruction method based on non-locally centralized sparse representation was used to reconstruct the final high-resolution image. In the simulation experiments, compared with the bi-l0-l2-norm based method, the average Peak Signal-to-Noise Ratio (PSNR) gain of the proposed method was 0.16 dB higher, the average Structural Similarity Index Measure (SSIM) gain was 0.0045 higher, and the average reduction of Sum of Squared Difference (SSD) ratio was 0.13 lower. The experimental results demonstrate a superior performance of the proposed method in terms of kernel estimation accuracy and reconstructed image quality.

Key words: super-resolution, blind reconstruction, blur-kernel estimation, penalty function, augmented Lagrangian method

摘要: 为了提高低分辨率模糊图像的质量,提出了一种基于自适应双lp-l2范数的超分辨率盲重建方法。该方法分为模糊核估计子过程和超分辨率非盲重建子过程。在模糊核估计子过程中,使用双lp-l2范数先验同时约束锐化图像和模糊核的估计,并使用图像梯度的阈值分割,实现锐化图像lp-l2范数约束的自适应组合;在超分辨率非盲重建子过程中,结合估计到的模糊核,使用基于非局部中心化稀疏表示的超分辨率方法重建出最终的高分辨率图像。仿真实验中,与基于双l0-l2范数的方法相比,该算法重建结果的平均峰值信噪比(PSNR)提高了0.16 dB,平均结构相似度(SSIM)提高了0.0045,平均差方和比降低了0.13。实验结果表明,所提方法能估计出较准确的模糊核,最终的重建图像中,振铃得到有效抑制,图像质量较好。

关键词: 超分辨率, 盲重建, 模糊核估计, 罚函数, 增广拉格朗日法

CLC Number: