Is there anybody who knows how to do this? This is an assignment for my Bioimagi

Question

Is there anybody who knows how to do this? This is an assignment for my Bioimaging course and I really need help! Here's how it works:

Write a MATLAB project that will do the following:

? load the sample image file 'Chest Xray 1.jpg';

? call a function that you write to determine the overall SNR of the entire image (this number is misleading and not of much value ? why? Write a brief statement of why)

? call the same function to determine the SNR in two areas of the image

? Now, call a function that you write to determine the CNR of the image, as measured using the two areas above.

? The main program can be a script m-file- it should call these two functions as described above and write out the four answers (three SNRs and a CNR).

You should:

- add a few comments

- keep code clean and neat

- use variable names that make sense ("SampImage" is good, but "q" is not)

Explanation / Answer

may be you can try like this

SNR = Psignal / Pnoise = (Asignal / Anoise)^2

Where P is power, and A is amplitude.

I would calculate the RMS amplitudes and use those in the above formula.

[edit]

RMS means Root-Mean-Square. That is, you square your signal, calculate the mean of that, and take the square root. Just define a wee anonymous function for clarity:

Now you can compute your ratio like so:

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