Dear ALL!! Suppose, I have image (256x256): img = im2double(imread('lena.bmp')); Then I perform discrete wavelet transform and get 4 components of source image: [a, h, v, d] = dwt2(img, 'db1'); Then I reconstruct signal using only detail components: det = idwt2([], h, v, d, 'db1'); Next I downsample det with 3/4, i.e. get det2 with size 192x192: det2 = downsample(det, 3/4); - not matlab code And I want to know can i get det from det2: det = reconstruct(det2); What filters i must use to perform such operation??? IS it possible operation???
Wavelets
Started by ●October 14, 2007
Reply by ●October 14, 20072007-10-14
jungle.war....@gmail.com wrote:> IS it possible operation???Well no, if I've got it right, you want to recover what you did away with during downsampling, without using the components resulting from the result of your DWT on your original signal, right?
Reply by ●October 18, 20072007-10-18