How to use Expectation maximization to estimate poisson noise matlab [closed]

I delved into the state of the art of algorithms for Poisson noise estimation in order to estimate the variance, I found that the Expectation Maximization algorithm is very used and it is very effective and easy to use,

But I have not found the matlab code, I found only one that is was used for classification,

can you give me the code or the algorithm for estimating and not for classification please.

I would be grateful if you answer me

closed as off-topic by jonsca, Niki Estner, penelope, Peter K.♦Oct 9 '13 at 12:25

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• "Questions requesting working code written to a specification are off-topic as they are unlikely to benefit anyone else. Instead, describe the problem you're solving and where you're stuck." – jonsca, Niki Estner, penelope, Peter K.
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• What do you mean by poisson noise estimation? Poisson parameter $\lambda$ is estimated using the sample mean. – Hasan Oct 9 '13 at 8:44
• @Hasan Poisson noise estimation mean estimating the level of the noise (variance sigma) in the image – manuala Oct 9 '13 at 15:17
• duplicate of stackoverflow.com/q/18813068/427252 – Memming Jan 22 '14 at 15:56