Can anyone please help me to fix this error in the coding of fractal image compression ? Your help is greatly appreciated. Thank you.

%Create psnr object
_

hpsnr = vision.PSNR;

psnr = step(hpsnr, I,outim);%calculate psnr
fprintf('PSNR= %f\n',psnr);%display psnr

Undefined variable "vision" 
Error in main (line 74)
hpsnr = vision.PSNR;

*Below is the completed source code.

Answer 1

[chandrapal Singh]

I tried this same code in MATLAB 2013b. It is working fine. You can try with PSNR function attached.

[chandrapal Singh]

hpsnr = vision.PSNR;

psnr = step(hpsnr, I,outim);%calculate psnr

replace this as

PSNR(I,outim);

[magnum ex]

I'm using the MATLAB R2017a.

Do you mean replace this code ""psnr = step(hpsnr, I,outim);""

as ""PSNR(I,outim);""

[magnum ex]

Finally, it's work. Thank you so much for your help.Greatly appreciate it. The complete code is attached.

[Anu Sri]

i am using this code for RGb image,but i am not getting the result.error is shown in : m=m+((X(i,j)-Y(i,j))^2); can you suggest me the right way to do this for RGB image

[Noor Abbas]

Dear Magum,

I have used your code with big size image but have an error with m=m+((I(i,j)-outim(i,j))^2);

Could you please suggest any soluation

Best Regards,

Noor

[Walter Roberson]

The code assumes that I is a 2D array which is quite unlikely for any jpg.

In particular it uses size(I) with 2 outputs. When I has more than two dimensions then the second output will be the product of all of the remaining dimensions . size() with only one input argument is designed so that the product of the outputs is equal to the number of elements in the array . So for rgb with only two outputs the second output will be 3 times the number of columns .