Medical Image Fusion Based on Sparse Representation and PCNN in NSCT Domain

Abstract EN

The clinical assistant diagnosis has a high requirement for the visual effect of medical images.

However, the low frequency subband coefficients obtained by the NSCT decomposition are not sparse, which is not conducive to maintaining the details of the source image.

To solve these problems, a medical image fusion algorithm combined with sparse representation and pulse coupling neural network is proposed.

First, the source image is decomposed into low and high frequency subband coefficients by NSCT transform.

Secondly, the K singular value decomposition (K-SVD) method is used to train the low frequency subband coefficients to get the overcomplete dictionary D, and the orthogonal matching pursuit (OMP) algorithm is used to sparse the low frequency subband coefficients to complete the fusion of the low frequency subband sparse coefficients.

Then, the pulse coupling neural network (PCNN) is excited by the spatial frequency of the high frequency subband coefficients, and the fusion coefficients of the high frequency subband coefficients are selected according to the number of ignition times.

Finally, the fusion medical image is reconstructed by NSCT inverter.

The experimental results and analysis show that the algorithm of gray and color image fusion is about 34% and 10% higher than the contrast algorithm in the edge information transfer factor QAB/F index, and the performance of the fusion result is better than the existing algorithm.