how to find peaks in jpeg image
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Image Analyst on 24 Jan 2015
But you'll have to decide how many elements you want the signal divided up into, say 500 or 1000 elements. And once you do that you can't get any wavenumbers because all we know is that the first element is around 2180. We have no idea what the last element in the array would have for a wavenumber because it's not shown on the plot.