intersecting image with plane

2017 5 17
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I have used the "surf" function to turn a grayscale image into a surface where xy are the original xy coordinate of the image and z is the light intensity at that image. I want to find the curve where this surface intersects with a plane z=(some number). Ideally a function for this curve would be best, but the coordinates of all the pixels would work too. Anybody have an idea of how I can do this?

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John D'Errico
John D'Errico 2017-5-17
编辑：John D'Errico 2017-5-17

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So you want to compute a level curve? Why would you not just use a contour plot to do that? If you want the curve itself as a polygonal path in the (x,y) plane, then:
help contourc

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