I am making a project on image forgery detection using demosaicing algorithm based on this paper http://cit​eseerx.ist​.psu.edu/v​iewdoc/dow​nload?doi=​10.1.1.303​.1357&rep=​rep1&type=​pdf .

I have query about how I will estimate positional variance, I know the equation is given the paper but I can't figure it out. Also what does x+y=d denote written near by the summation, it doesn't seem to be limit to be me if it is, is a upper limit or lower limit.Also can't figure the values of x and y. I really can't understand please help me out here, I am new to MATLAB. Please mail me the MATLAB code at [e-mail] .

[jonas]

https://se.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

You could send a mail to the corresponding author asking for clarification. They may even be willing to share code.

[KALYAN ACHARJYA]

Yes, I agree with @jonas, you can write a mail to the author. Here post a question related to Matlab implementation.

[Ravindra Singh Pawar]

To the author of the research paper??

[Walter Roberson]

Yes to the author of research paper.

[Ravindra Singh Pawar]

how can I get the email of the author?

[jonas]

The corresponding author usually has his/her contact information on the first page of the paper. I cannot find the actual paper to verify that this is the case here.

[Ravindra Singh Pawar]

I have got the actual paper http://chenlab.ece.cornell.edu/people/Andy/publications/Andy_files/CVPR08WVUGallagher.pdf but the email in this paper is not valid anymore.

[jonas]

The author seems to be working for google AI nowadays. You will have to do some digging yourself. Hopefully you can find his contact information via his work. If not, you may be able to find a more recent publication by the same author with updated contact details.

There was a post on this forum a few days ago on the same topic ( link ). Perhaps its somehow related?

[Ravindra Singh Pawar]

okay,thank you. Are you sure he will be sharing his code

[jonas]

No, I cant be sure of anything. It is quite likely that he is legally able to, since he did the work at a university.

[Ravindra Singh Pawar]

Sorry I can't understand

[Walter Roberson]

To summarize: MATLAB Answers is for questions about MATLAB, Simulink, Polyspace and other Mathworks products. Questions about algorithms should be asked somewhere else, such as to the authors of the paper or in an image processing forum.

[Ravindra Singh Pawar]

But I didn't know about the forum. I am just a student.

[Walter Roberson]

https://groups.google.com/forum/#!forum/ipcv

https://stackoverflow.com/questions/tagged/image-processing

As a student, you are probably eligible to use researchgate.net .