Wavelet and image processing

2 次查看（过去 30 天）
Ayesha
Ayesha 2014-1-17
评论： Walter Roberson 2017-1-24
Hi there!
Alright, so I've been working on this little piece of code to approximate image using wavelets and there's this error I'm getting:
Subscripted assignment dimension mismatch.
So the code goes this way:
I = imread('lena.png');
J = perform_wavelet_transf(I,j0,+1);
n = size(I,1);
J1 = zeros(n);
J1(1:n/4,1:n/4) = J(1:m,1:m);
result = perform_wavelet_transf(J1,j0,-1);
imshow(result,[]);
I've been wondering since hours on what could possibly go wrong with this piece and I guess somethings not right with
J1(1:n/4,1:n/4) = J(1:m,1:m);
What do you think?
And yes, Thanks alot!!! for your help in advance :)

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2014-1-17
You have not shown us how you construct "m" so all we can do is hypothesize that you construct it without regard for the actual size of lena.png
  2 个评论
Ayesha
Ayesha 2014-1-17
That's the part I'm experimenting since wavelets deals with coarse details and hence j0 is an integer.
j0=128;
M = 2^(-j0);
m=sqrt(M);
Walter Roberson
Walter Roberson 2017-1-24
sqrt(2^-128) is 2^-64, which is a number less than 1. 1:m would then be the empty range, so J(1:m,1:m) would be empty. You are trying to store that empty range into a non-empty location.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 AI for Signals and Images 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by