基于加权Boosting的核偏最小二乘图像超分辨率重建

doi:10.3724/SP.J.1146.2011.01191

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摘要核偏最小二乘(KPLS)算法对每个图像块选用全部主元成分进行图像重建，导致图像超分辨率算法的计算量大。兼顾图像重建质量和时间效率，该文提出一种加权Boosting的图像超分辨率重建算法。为自适应地选取每个图像块主元成分的最佳数目，利用加权Boosting原理对KPLS回归预测量进行补偿，推导给出补偿权重系数的数学表达式。讨论不同Boosting阈值δ情况下的重建性能，在合适δ的下，选取出主元成分的最佳数目m更好地满足KPLS回归模型的精度要求。实验结果表明，该文算法的超分辨率重建质量优于传统算法。

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	李小燕
	和红杰
	尹忠科
	陈帆

关键词 ：图像超分辨率重建, 加权Boosting, 核偏最小二乘(KPLS), Boosting阈值, 主元成分

Abstract：The Kernel Partial Least Squares (KPLS) method has a large calculation since it uses all the principal components for each image block. To consider reconstruction quality and time efficiency, a weighted Boosting based algorithm is proposed in this paper. To choose adaptively the best number of principal components for each image block, the estimator in KPLS prediction model is performed for compensation. The weight coefficient expression of compensation is deduced. The reconstruction effects in different Boosting threshold are discussed. With an appropriate threshold, the chosen best number of principal components can better satisfy KPLS regression model accuracy. Experimental results demonstrate that the proposed method outperforms the conventional methods in super-resolution reconstructed quality.

Key words： Image super-resolution reconstruction Weighted Boosting Kernel Partial Least Squares (KPLS) Boosting threshold Principal component

收稿日期: 2011-11-16

PACS:

TP391

基金资助:

国家自然科学基金(60970122)，教育部博士点基金(20090184120021)，中央高校基本科研业务专项基金(SWJTU09CX039, SWJTU10CX09)和四川省科技创新苗子工程项目(2011-013)资助课题

通讯作者: 和红杰 E-mail: lixiaoyan7015@yahoo.cn; hehojie@126.com

引用本文:

李小燕, 和红杰, 尹忠科, 陈帆. 基于加权Boosting的核偏最小二乘图像超分辨率重建[J]. 电子与信息学报, 2012, 34(7): 1525-1530. Li Xiao-Yan, He Hong-Jie, Yin Zhong-Ke, Chen Fan. Image Super-resolution Reconstruction Based on Kernel Partial Least Squares and Weighted Boosting. , 2012, 34(7): 1525-1530.

链接本文:

http://jeit.ie.ac.cn/CN/10.3724/SP.J.1146.2011.01191 或 http://jeit.ie.ac.cn/CN/Y2012/V34/I7/1525