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Re: Line index [message #5959 is a reply to message #5957]

Fri, 22 March 1996 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Hermann Mannstein <H.Mannstein@dlr.de> wrote:
>
> Hello,
> is there a robust function which returns the indices within an image
> (like the where function)
> belonging to a line defined by two or more points.

I don't have a function, but I can suggest a possible solution.
Given your two points, if you use the familiar Y = mX + B formula
to calculate the (X,Y) coordinate pairs for either each X or for
each Y along the "span" of the line (use the one that gives you
more points), and then convert these pairs to one-dimensional
indices using the formula

Indices = ( Y_coors * Xdim ) + X_coors

where the "image" is Xdim x Ydim. Obviously you'll have to do
some checking to make sure the points are within the image.

Hope this is useful.

Dave Foster
foster@bial1.ucsd.edu

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[Message index]

		Re: Line index By: David Foster on Fri, 22 March 1996 00:00
		Re: Line index By: David Foster on Fri, 22 March 1996 00:00
		Re: Line index By: pit on Fri, 15 March 1996 00:00

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