[WM]: One questions about dtw2 and idtw2, emergency!!

[zh_do@encs.concordia.ca]

Dear all,

When I using dwt2 to decompose a grayscale image, say 512 x 512 using bior4.4.
(I want to use the Daubechies 9/7, but there is no such functions in Matlab)

[CA, CH, CV, CD] = idw2(image_data, 'bior)

For the first level, the four band image is all 260 x 260!
and many intensities of CA is larger than 255!

I hope all the four band is 256 x 256, and CA is between 0 to 255. CV, CH, CD is no less than 0!  What is more, there should be no
information lost during the translation. Finally, I hope I can restore the image using idw2 command by these "normalized
CA,CH,CV,CD'



Thank you very much!!

Jeffery Dong


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