Find out the peak position from graph

Hello All,,
Actually i want to run this algorithm real time,, to find out the peak position from graph ,, i need to generate the position automatically,,, firstly i try to use image processing by apply threshold followed by edge detection and the find out the center of each detected part. the drawpack of this procedure is that the obtained images are different and that lead to different threshold values,, so how can i directly find the position from the graph,,, here i attach the image and the graph of the image,,
thank you,,
Attachments:
11.png ‏15 KB
13.PNG ‏85 KB

Hello Klemen:
here i will explain in more details: the main objective of my work is to calculate velocity of small particle,, i perform my experiments by exposing the particle to 2 light pulses,, and i know the time between the two pulses,, so i need to know the distance to calculate the velocity,,, for that i apply correlation,,, the spot that appear in the correlation image is an indication of symmetry,,,so i should know the location of maximum intensity of each peak. The central peak (highest intensity) will be the reference (zero point) and the other peaks locations should be subtracted from the reference peak to determine the shift,,,
Here is the sequence of the process:
Acquiring raw image, correlation, position of central peak, shift calculation, velocity determination,,,,,
applying image processing is good idea in case of post processing condition,,, but in my case i need it real time, that mean if i need to apply image processing for calculation, i have to find out a universal criteria for threshold value that can be applied for all raw images,, from my experiments i didn't find specific criteria & i have to manually change the threshold value,,
If I choose the intensity (grey level) to be the criteria, then the small peaks (symmetry) will not take place,, because their intensity is very low compare to the central peak,,,
So the most reliable procedure is to directly find out the position of the two small peaks beside the central peak and save this values into an array and use it for calculation,,, I hope I am clearly explain my problem..
Thanks
Attachments:
7-2.png ‏36 KB
7-1.png ‏3 KB
7-700.PNG ‏123 KB

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