华南理工大学学报(自然科学版) ›› 2015, Vol. 43 ›› Issue (1): 28-33.doi: 10.3969/j.issn.1000-565X.2015.01.005

• 电子、通信与自动控制 • 上一篇    下一篇

基于 DCT 频带能量的压缩感知重构算法

刘杰平 方杰 韦岗   

  1. 华南理工大学 电子与信息学院, 广东 广州 510640 
  • 收稿日期:2014-06-05 修回日期:2014-09-10 出版日期:2015-01-25 发布日期:2014-12-01
  • 通信作者: 刘杰平(1961-),女,博士,副教授,主要从事图像处理和多媒体通信研究 . E-mail:eeliujp@scut.edu.cn
  • 作者简介:刘杰平(1961-),女,博士,副教授,主要从事图像处理和多媒体通信研究 .
  • 基金资助:

    国家自然科学基金资助项目( 60972135 );广州市科信局对外合作专项( 2012J5100010 )

Compressed Sensing Reconstruction Algorithm Based on DCT Band Energy

Liu Jie-ping Fang Jie Wei Gang   

  1. School of Electronic and Information Engineering , South China University of Technology , Guangzhou 510640 , Guangdong , China
  • Received:2014-06-05 Revised:2014-09-10 Online:2015-01-25 Published:2014-12-01
  • Contact: 刘杰平(1961-),女,博士,副教授,主要从事图像处理和多媒体通信研究 . E-mail:eeliujp@scut.edu.cn
  • About author:刘杰平(1961-),女,博士,副教授,主要从事图像处理和多媒体通信研究 .
  • Supported by:
    Supported by the National Natural Science Foundation of China ( 60972135 )

摘要: 为提高压缩感知图像的重构质量,提出了一种基于离散余弦变换( DCT )分频带压缩感知的平滑投影 Landweber 重构算法 . 该算法充分考虑了不同的 DCT 系数频带对重构图像质量有不同的影响,对图像进行分块 DCT 后,按照频带能量大小重新组织 DCT 系数,对能量大的频带分配大的采样率,通过分频带变采样率的随机矩阵实现随机观测,采用平滑滤波器消除块效应,由投影 Landweber 算法实现图像的重构 . 实验结果表明,与 BCS-SPL和 MS-BCS-SPL 重构算法相比,文中提出的算法显著提高了重构图像的峰值信噪比 .

关键词: 压缩感知, 平滑投影 Landweber, 重构算法, 变采样率

Abstract:

In order to improve the reconstruction quality of compressed sensing images , a band-CS (Compressed Sensing) algorithm with smooth projection Landweber is proposed on the basis of discrete cosine transform (DCT). Since different DCT coefficient bands have different effects on the final image reconstruction quality ,first , this algorithm divides an image into several blocks and carries out DCT for each block. Secondly , DCT coefficients are regrouped according to the band energy , and the band with higher energy is sampled by random matrix with greater sampling rate. Then , the blocking effect is eliminated by using a smoothing filter. Finally ,the compressed sensing reconstruction of images is implemented by means of smooth projection Landweber.Experimental results show that , in comparison with BCS-SPL and MS-BCS-SPL algorithms , the proposed algorithm improves the peak signal-to-noise ratio of reconstructed images significantly.

Key words: compressed sensing, smooth projection Landweber, reconstruction algorithm, variable sampling rate

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