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Grigory A. Filimonov

Just measure the on-axis intensity for each frame, and calculate

Sigma_I_2 = Average(I^2) / Average(I) / Average(I) -1

Sanjay Kumar Mishra

Dear Grigory

For scintillated spot how to define onaxis intensity.

Sanjay, I suggest, you can measure Intensity of the central pixel of the image, or average spot Intensity, for spot containing several central pixels