image watermarking using dwt

I am using the following code to embed an image as a watermark in HL component of the host image "after performing dwt on host image" and I get this error message

""Array dimensions must match for binary array op"" could you help me to fix this problem please?

B = 'Host.png';
rgbhostImage = imread(B);
[f7,f8]= wfilters('haar','d');
[A,V,H,D]= dwt2(rgbhostImage,'haar','d');
[A2,V2,H2,D2]= dwt2(A,'haar','d');
w= imread('watermarkimage.png');
water= imresize(w, [512, 365]);
imwrite(water,'watermarkimage2.png');
watermark= imread('watermarkimage2.png');
%watermarking
wtrmrk= double(watermark);
Q= double(H2);
wtrmrkedimage= Q+0.001*wtrmrk;

Answer 1

[KALYAN ACHARJYA]

As you didnot provided the sufficient data, but I have figure out, in which line the error occured

I have test the code with different images, the error is same

wtrmrkedimage= Q+0.001*wtrmrk;
% Plese ensure that Q and wtrmrk must have same size

How can you add the two different dimension matrices, debug the code in such that Q and wtrmrk must have same dimention (also type), checked the following way.

>> whos Q
  Name        Size              Bytes  Class     Attributes
  Q         128x128            131072  double              
>> whos wtrmrk
  Name          Size               Bytes  Class     Attributes
  wtrmrk      512x365            1495040  double              
>> 

Check the all variable, so that dimention must agree.

[jojototo]

Thank you so much