Edge Tracking a beam between two images

Question

Graham Boag 2011-2-22

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Hi, I am looking into tracking the edge of a beam which slightly moves between two images. I currently have been given a code which uses 'phase singularity tracking' which works but was wondering if there was a code which can simply track the edges of the beam in these images? I am pretty new to Matlab and have currently tried to use intensity of white to black across a line of pixels to try and pick up the beam edge and I require another technique (I have seen edge detection examples but can they be applied for tracking?).

Many Thanks, Graham

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Answer 1

Sean de Wolski 2011-2-22

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An edge filter should work just fine on this.

doc edge

or you do a simple threshold:

 Imask = I<50;
 the_edges = bwperim(Imask);

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Graham Boag 2011-2-22

Thank you - however If I show the image of your code it seems most of the beam is missing and I can't detect the whole thing (even if I change the I<x)

I can get a pretty good edge detection from the code

BW2 = edge(I,'canny');

but was wondering if there was a way of measuring the edge when it moves from one image to another? ( I have tried superimposing the images together after edge detection then editing it in paint to see how many pixels apart the edges are...but it doesnt seem like an accurate method!)

Thanks, Graham

Sean de Wolski 2011-2-22

Well you could use bwboundaries to get the pixels on each edge and compare them directly.

Or you could stack all of your slices together in a 3D image volume, edge it, and figure out the change in the edge using a gradient or other technique.

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