Imaging Components, Systems, and Processing

Multifocus image fusion scheme based on the multiscale curvature in nonsubsampled contourlet transform domain

[+] Author Affiliations
Xiaosong Li, Huafeng Li, Zhengtao Yu, Yingchun Kong

Kunming University of Science and Technology, Faculty of Information Engineering and Automation, Chenggong Campus, Yunnan Province, Kunming 650500, China

Opt. Eng. 54(7), 073115 (Jul 30, 2015). doi:10.1117/1.OE.54.7.073115
History: Received December 12, 2014; Accepted June 30, 2015
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Abstract.  An efficient multifocus image fusion scheme in nonsubsampled contourlet transform (NSCT) domain is proposed. Based on the property of optical imaging and the theory of defocused image, we present a selection principle for lowpass frequency coefficients and also investigate the connection between a low-frequency image and the defocused image. Generally, the NSCT algorithm decomposes detail image information indwells in different scales and different directions in the bandpass subband coefficient. In order to correctly pick out the prefused bandpass directional coefficients, we introduce multiscale curvature, which not only inherits the advantages of windows with different sizes, but also correctly recognizes the focused pixels from source images, and then develop a new fusion scheme of the bandpass subband coefficients. The fused image can be obtained by inverse NSCT with the different fused coefficients. Several multifocus image fusion methods are compared with the proposed scheme. The experimental results clearly indicate the validity and superiority of the proposed scheme in terms of both the visual qualities and the quantitative evaluation.

© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Xiaosong Li ; Huafeng Li ; Zhengtao Yu and Yingchun Kong
"Multifocus image fusion scheme based on the multiscale curvature in nonsubsampled contourlet transform domain", Opt. Eng. 54(7), 073115 (Jul 30, 2015). ; http://dx.doi.org/10.1117/1.OE.54.7.073115


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