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Journal of Sensors
Volume 2016, Article ID 6370845, 12 pages
http://dx.doi.org/10.1155/2016/6370845
Research Article

An Efficient Image Enlargement Method for Image Sensors of Mobile in Embedded Systems

1College of Electronics and Information Engineering, Sichuan University, Chengdu, Sichuan 610064, China
2College of Electrical and Engineering Information, Sichuan University, Chengdu, Sichuan 610064, China
3School of Software Engineering, Beijing Jiaotong University, Beijing 100044, China

Received 20 November 2015; Revised 5 March 2016; Accepted 21 March 2016

Academic Editor: Marco Anisetti

Copyright © 2016 Hua Hua et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Main challenges for image enlargement methods in embedded systems come from the requirements of good performance, low computational cost, and low memory usage. This paper proposes an efficient image enlargement method which can meet these requirements in embedded system. Firstly, to improve the performance of enlargement methods, this method extracts different kind of features for different morphologies with different approaches. Then, various dictionaries based on different kind of features are learned, which represent the image in a more efficient manner. Secondly, to accelerate the enlargement speed and reduce the memory usage, this method divides the atoms of each dictionary into several clusters. For each cluster, separate projection matrix is calculated. This method reformulates the problem as a least squares regression. The high-resolution (HR) images can be reconstructed based on a few projection matrixes. Numerous experiment results show that this method has advantages such as being efficient and real-time and having less memory cost. These advantages make this method easy to implement in mobile embedded system.