"How can I put image signal in many cells to use the wavelet transform after that?"

Dear Sir,

I am looking to put image signal in many cells to use it to the wavelet transform because I can not use the wavelet transform directly to obtain on this massage "Out of Memory". You will find here the steps that I do it:

1- x1=imread('image1.jpg'); 2- size(x1)

ans =

        2736        3648           3 
3- k=length(x1)

k =

        3648
4- f=x1(:,1:k,:);
5- I will have the massage above when I make this step:

[C,S] = wavedec2(y,6,'db5');

I think if I put columns and rows and many cells then I do not obtain this massage...

Thank you very much