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Improving performance of medical image fusion using histogram, dictionary learning and sparse representation

Research paper by Yi Li, Zhihan Lv, Junli Zhao, Zhenkuan Pan

Indexed on: 15 Aug '19Published on: 15 Aug '19Published in: Multimedia Tools and Applications



Abstract

Medical image fusion has attracted much attention in recent years, which aims to fuse different medical images into a more informative and clearer one. The fused image is able to help doctors to diagnose diseases rapidly and effectively. Among numerous fusion methods, sparse-representation-based image fusion is a new concept that has emerged over the past several years. However, the high-frequency components of low-resolution and the high-frequency components of source images are obtained equally, and sparse coefficients are solved by a minimization problem. As a result, it ignores the correlation between high-frequency components of low-resolution and the high-frequency components of source images, and solutions to the L0-norm minimization problem. To address these issues, we propose a new image fusion method based on histogram similarity and multi-view weighted sparse representation. By introducing a histogram similarity, different weights are assigned to the high-frequency components of low-resolution and the high-frequency components of source images to efficiently harness the complementary information. In addition, sparse coefficients solved by the L1-norm minimization problem are more accurate. This technique is further incorporated into medical image fusion. Experimental results demonstrate that the proposed method achieves state-of-the-art performance in terms of both visual quality and quantitative evaluation metrics.