[image fusion] multi focus and multi spectral image fusion based on pixel saliency and wavelet transform with matlab code

1 brief introduction

The energy compaction and multiresolution properties of wavelets have made the image fusion successful in combining important features such as edges and textures from source images without introducing any artifacts for context enhancement and situational awareness. The wavelet transform is visualized as a convolution of wavelet filter coefficients with the image under consideration and is computationally intensive. The advent of lifting-based wavelets has reduced the computations but at the cost of visual quality and performance of the fused image. To retain the visual quality and performance of the fused image with reduced computations, a discrete cosine harmonic wavelet (DCHWT)-based image fusion is proposed. The performance of DCHWT is compared with both convolution and lifting-based image fusion approaches. It is found that the performance of DCHWT is similar to convolution-based wavelets and superior/similar to lifting-based wavelets. Also, the computational complexity (in terms of additions and multiplications) of the proposed method scores over convolution-based wavelets and is competitive to lifting-based wavelets.​

2 Part of the code

function [jhist_out]=joint_hist_fn(x1,x2)​%%% joint_hist_fn: Computes the joint histogram of Images x1 and x2.%%% %%% jhist_out=joint_hist_fn(x) %%% Example:%%%   Y = joint_hist_fn(X);  %% takes a pair of images x1 & x2 of equal size and returns the 2d joint histogram.%%%%%% Author : B. K. SHREYAMSHA KUMAR %%% Created on 21-10-2011.%%% Updated on 21-10-2011.​[p,q]=size(x1);jhist_out=zeros(256,256);for ii=1:p   for jj=1:q      jhist_out(x1(ii,jj)+1,x2(ii,jj)+1)=jhist_out(x1(ii,jj)+1,x2(ii,jj)+1)+1;   endend

3 Simulation results

4 reference

[1] Bai Chunlan , Liu Hao . Image fusion based on wavelet transform and its application MATLAB Realization [J]. Technology Plaza , 2014(8):3.

[2] Kumar B K S . Multifocus and multispectral image fusion based on pixel significance using discrete cosine harmonic wavelet transform[J]. Signal, Image and Video Processing, 2013, 7(6):1125-1143.

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