How to interpolate a graph to find a point halfway from the max peak
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Hi, I am wondering how to find a point halfway from the maximum point (thats pointing down the way) on the graph I created:
http://www.2shared.com/photo/pIak1Za9/graph1.html
It was made using the code
I = imread('f_000021.tif','TIFF'); imshow('f_000021.tif') x=[128 180]; y=[50 50]; improfile(I,x,y) plot(max)
There isn't many pixels plotted so I was wondering if I could pick a point in between a couple of pixels on that graph (half of the maximum value)?
Thanks, Graham
5 Comments
Jan
on 24 Feb 2011
No problem. Finding a solution is often a iterative process, which clears the question at first. If the question is absolutely and mathematically clear, the solution is usually found already.
Accepted Answer
Jan
on 24 Feb 2011
Do you search for something like this?
V = sin(0:0.01:pi/2);
maxV = max(V);
minV = min(V);
Range = maxV - minV;
HalfIndex = find(V > maxV - Range / 2, 1, 'first');
You have to adjust the signs and > or < according to your exact problem.
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