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distance-transform

distance-transform

Distance transforms for Lp metrics on binary ndarrays. This code is based on Meijster's algorithm. For more information see:

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Example

//Generate some shape as a binary voxel image 
var x = require("zeros")([256, 256])
x.set(128, 128, 1)
 
//Distance transform x in the Euclidean metric 
require("distance-transform")(x)
 
//Save result 
require("save-pixels")(x, "png").pipe(process.stdout)

Output

Install

Install using npm:

npm install distance-transform

API

require("distance-transform")(array[, p])

Performs a distance transform of array in place using Meijster's algorithm.

  • array is the array to transform
  • p is the exponent for the metric. (Default 2)

For different values of p you get different transforms

  • p = 1 gives the Manhattan/taxicab distance metric
  • p = 2 gives the Euclidean distance metric
  • p = Infinity gives the Chebyshev/chessboard distance metric
  • Other values of p give various interpolants

array is updated in place and gets the distance values.

License

(c) 2013 Mikola Lysenko. MIT License.