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采用超分辨率重建提升压缩图像质量的方法
引用本文:胡耀华,何小海,吴晓红,张晓琳,黄建秋.采用超分辨率重建提升压缩图像质量的方法[J].电视技术,2015,39(9):14-18.
作者姓名:胡耀华  何小海  吴晓红  张晓琳  黄建秋
作者单位:四川大学电子信息学院,四川成都,610065
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目), 国家自然科学基金委员会和中国工程物理研究院联合基金
摘    要:针对JPEG的中低码率压缩图像即高压缩率图像存在较严重的块效应以及量化噪声,提出了一种对JPEG标准压缩图像进行优化的重建-采样方法.该方法对JPEG压缩图像采用三维块匹配算法(BM3D)进行去噪,去除图像中存在的块效应和量化噪声,进而提高超分辨率重建的映射准确性,再使用外部库对去噪后图像进行基于稀疏表示的超分辨率重建,补充一定的高频信息,最后对重建后的高分辨率图进行双三次下采样,得到与原始图像大小一致的图像作为最终优化图像.实验结果表明,该方法在中低码率情况下能够有效地提高JPEG压缩图像的质量,对高码率压缩图像也有一定效果.

关 键 词:图像压缩  超分辨率重建  去噪  下采样
收稿时间:2014/6/27 0:00:00
修稿时间:2014/8/12 0:00:00

A Method of Applying Super-resolution Reconstruction to Improve The Quality of Compressed Images
Huyaohu,hexiaohai,wuxiaohong,zhangxiaolin and huangjianqiu.A Method of Applying Super-resolution Reconstruction to Improve The Quality of Compressed Images[J].Tv Engineering,2015,39(9):14-18.
Authors:Huyaohu  hexiaohai  wuxiaohong  zhangxiaolin and huangjianqiu
Affiliation:College of Electronics and Information Engineering, SiChuan University,College of Electronics and Information Engineering, SiChuan University,College of Electronics and Information Engineering, SiChuan University and College of Electronics and Information Engineering, SiChuan University
Abstract:Considering the low bit-rates compression images of JPEG present serious block artifacts and quantization noise, a method of Reconstruction down-sampling which can optimize JPEG and improve the JPEG compress image quality is proposed. Firstly, BM3D is used to denoise the JPEG compressed image to remove block artifacts and quantization noise , in order to improve the accuracy of super-resolution reconstruction mapping; Secondly, the sparse representation based super-resolution image reconstruction is applied to reconstruct the denoised image to add some high-frequency information, the dictionary used in reconstruction is trained in advance; Finally ,down-sampling the reconstructed image , obtain the final decoding image of the same size as original image. Experimental results show that when the bit rate is low, the proposed method achieves significantly PSNR increase compared with JPEG at the same bit rate, and also gains some PSNR increase for high bit-rate compress image.
Keywords:Image compression  Super-resolution Reconstruction  Denoise  Down-sampling
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