Sir, Iam doing a matlab project on reconstruction of image using circulant matrices. The code is below. Whilw performing multiplication (r1=img*r)

img=imread('car.jpg');
imshow(img);

rchan = img(:,:,1); % Red channel)
gchan = img(:,:,2); % Green channel
bchan = img(:,:,3); % Blue channel
[row1,column1] = size(rchan);
[row2,column2] = size(gchan);
[row3,column3] = size(bchan);

rvect=reshape(rchan,[],1);
gvect=reshape(gchan,[],1);
bvect=reshape(bchan,[],1);

A=[rvect(:),gvect(:),bvect(:)];
c=cov(double(A));
imshow(rchan);

j=(c(1,1)+c(2,2)+c(3,3))/3;
k=(c(1,2)+c(2,3)+c(1,3))/3;
l=(c(1,3)+c(1,2)+c(2,3))/3;
m=[j k l;l j k;k l j];
[V,D,M]=eig(m);

r=V;
s=V(:,2:3);
t=V(:,1);

r1=img*r;
s1=img*s;
t1=img*t;

x=reshape(r1,row1,column1,[]);
y=reshape(r2,row2,column2,[]);
z=reshape(r3,row3,column3,[]);

imshow(x);
imshow(y);
imshow(z);

error
Error using  * 
MTIMES is not fully supported for integer classes. At least one input must be scalar.
To compute elementwise TIMES, use TIMES (.*) instead.

Error in dsp2 (line 30)
r1=img*r;

Answer 1

[madhan ravi]

Try as the message says:

r1=img.*r;
s1=img.*s;
t1=img.*t;

[Aditya C]

i tried that to but it dint work

[madhan ravi]

whats the error message when you tried this? upload car.jpg file to test

[Aditya C]

Error using .* Integers can only be combined with integers of the same class, or scalar doubles.

Error in dsp2 (line 30) r1=A.*r;

[madhan ravi]

upload your image file

[Aditya C]

sorry where to upload???

[madhan ravi]

click the paper clip button and then upload

[Aditya C]

here

[madhan ravi]

>> size(img)

ans =

     164   308     3

>> size(r)

ans =

       3     3

>>

[madhan ravi]

img is 3 dimensional array and r is 2 dimensional how can you multiply them??

[Aditya C]

no even when i replace A(2d matrix) with img iam getting the error Error using .* Integers can only be combined with integers of the same class, or scalar doubles.

Error in dsp2 (line 30) r1=A.*r;

[madhan ravi]

I'm helpless then

[Rik]

Then make sure they are the same class. You can convert them all to a double, or put them all in uint8 (which I'm guessing is the class of img and therefore A)

Answer 2

[Aditya C]

here is the image used