Code to generate stencils for the rle level set processing libraries.
To install the library, just do:
npm install rle-stencils
Then in your code you can import the stencil generators using:
var stencils = require('rle-stencils');
Here is how to create a stencil for a Moore neighborhood with radius 2:
var moore_neighborhood = stencils.moore(2);
And here is the same idea applied to a von Neumann neighborhood
var von_eumann_neighborhood = stencils.vonNeumann(1);
var ball_neighborhood = stencils.ball(5);
More generally, you can create a stencil for any Lp ball, with p being some fixed power. For example, here is how to make an L^3 ball with radius 6:
var cubic_neighborhood = stencils.lp(3, 6);
In general, calls to lp(p, r)
return the collection of all integer lattice points x
satisfying the inequality:
Math.pow(Math.abs(x[0]), p) + Math.pow(Math.abs(x[1]), p) + Math.pow(Math.abs(x[2]), p) <= Math.pow(r, p)
(c) 2013 Mikola Lysenko. MIT License