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Jianing Zheng

at Chongqing University

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Proceedings Article | 27 September 2016 Paper

An adaptive block-based fusion method with LUE-SSIM for multi-focus images

Jianing Zheng, Yongcai Guo, Yukun Huang

Proceedings Volume 9684, 96843I (2016) https://doi.org/10.1117/12.2241373

KEYWORDS: Image fusion, Image quality, Particle swarm optimization, Visualization, Image processing, Signal processing, Wavelets, Databases, Distortion, Error analysis

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Because of the lenses’ limited depth of field, digital cameras are incapable of acquiring an all-in-focus image of objects at varying distances in a scene. Multi-focus image fusion technique can effectively solve this problem. Aiming at the block-based multi-focus image fusion methods, the problem that blocking-artifacts often occurs. An Adaptive block-based fusion method based on lifting undistorted-edge structural similarity (LUE-SSIM) is put forward. In this method, image quality metrics LUE-SSIM is firstly proposed, which utilizes the characteristics of human visual system (HVS) and structural similarity (SSIM) to make the metrics consistent with the human visual perception. Particle swarm optimization(PSO) algorithm which selects LUE-SSIM as the object function is used for optimizing the block size to construct the fused image. Experimental results on LIVE image database shows that LUE-SSIM outperform SSIM on Gaussian defocus blur images quality assessment. Besides, multi-focus image fusion experiment is carried out to verify our proposed image fusion method in terms of visual and quantitative evaluation. The results show that the proposed method performs better than some other block-based methods, especially in reducing the blocking-artifact of the fused image. And our method can effectively preserve the undistorted-edge details in focus region of the source images.

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