平稳小波变换 (MATLAB)

Question

请任何人解释以下代码的作用。该代码使用平稳小波变换执行图像融合。

 %image decomposition using discrete stationary wavelet transform  
 [A1L1,H1L1,V1L1,D1L1] = swt2(im1,1,'sym2');
 [A2L1,H2L1,V2L1,D2L1] = swt2(im2,1,'sym2');
 [A1L2,H1L2,V1L2,D1L2] = swt2(A1L1,1,'sym2');
 [A2L2,H2L2,V2L2,D2L2] = swt2(A2L1,1,'sym2');

 % fusion at level2
 AfL2 = 0.5*(A1L2+A2L2);     **what are these equations ?**
 D = (abs(H1L2)-abs(H2L2))>=0;
 HfL2 = D.*H1L2 + (~D).*H2L2;
 D = (abs(V1L2)-abs(V2L2))>=0;
 VfL2 = D.*V1L2 + (~D).*V2L2;
 D = (abs(D1L2)-abs(D2L2))>=0;
 DfL2 = D.*D1L2 + (~D).*D2L2;

 % fusion at level1
 D = (abs(H1L1)-abs(H2L1))>=0;
 HfL1 = D.*H1L1 + (~D).*H2L1;
 D = (abs(V1L1)-abs(V2L1))>=0;
 VfL1 = D.*V1L1 + (~D).*V2L1;
 D = (abs(D1L1)-abs(D2L1))>=0;
 DfL1 = D.*D1L1 + (~D).*D2L1;

 % fused image
 AfL1 = iswt2(AfL2,HfL2,VfL2,DfL2,'sym2');
 imf = iswt2(AfL1,HfL1,VfL1,DfL1,'sym2');

Answer 1

此处Fusion Level 2的AfL2、HfL2、VfL2、DfL2为

近似系数水平细节系数垂直细节系数对角细节系数

下一级也相同，根据概念它们各自的数学实现。

读一遍概念文档非常重要，这样你就可以很容易地理解实现，你可以从下面的信息中找到信息link，你可以直接移动到解释概念的框图然后是物理实现：

http://ijeetc.com/ijeetcadmin/upload/IJEETC_50e52508758cf.pdf

平稳小波变换 (MATLAB)

stationary wavelet transform (MATLAB)

matlab

image

image-processing

matrix

wavelet