nsst图像增强这方面有人做过吗

主程序调试成功但是图没有变化为什么呢？工具箱来自pudn，nsst图像增强
im=imread('C:\Users\Administrator\Desktop\tu\jiama117.bmp');
nlevels = 4 ; % Decomposition level
%pfilter = 'pkva' ; % Pyramidal filter
dfilter = 'dmaxflat7'; %'cd' ; % Directional filter
coeffs = nsdfbdec( double(im), dfilter, nlevels );
disp( nlevels); disp(dfilter);
% Reconstruct image
imrec = nsdfbrec( coeffs, dfilter ) ;
figure;
subplot(1,2,1), imagesc( im, [0, 255] );
title('Original image' ) ;
colormap(gray);
axis image off;
subplot(1,2,2), imagesc( imrec, [0, 255] );
title('Reconstructed image' ) ;
colormap(gray);
axis image off;