我想从仅从最大系数的 5% 的多级 DWT 变换中重建图像,同时将其余系数设置为零。我不确定我需要从哪些系数中选择最大的 5%?A、H、V 还是 D?
这是我到目前为止所做的:
% Read image
x = imread('app.bmp');
% Define wavelet name
wavelet = 'haar';
% Define wavelet decomposition level
level = 4;
% Define colormap
map = gray;
% Compute multilevel 2D wavelet decomposition
[C, S] = wavedec2(x,level,wavelet);
for i = 1:levle
% Approximation coefficients
A = appcoef2(C,S,'haar',i);
% Detailed coefficients
[H,V,D] = detcoef2('all',C,S,i);
end
任何帮助,将不胜感激!