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This module implements 1D noise reduction filters. There are currently two available:
-
median filter
-
rolling average with threshold
median(data, windowSize)-
data: An array of numbers. -
windowSize: The size of the window over which the median is applied. Should be an odd number greater than one, defaults to3.
var median = require('filters').median;
var raw = [ 2, 3, 4, 9, 6, 2 ];
console.log(median(raw));
// => [ 2, 3, 4, 6, 6, 2 ]average(data, windowSize, threshold)-
data: An array of numbers. -
windowSize: The size of the rolling average window. Should be two or greater, defaults to3. -
threshold: Maximum difference between two numbers for the average still to be applied. Use this to smooth out small variations but large varitions through immediately. The difference between /a/ and /b/ is calculated as /(max(a, b) - min(a, b)) / max(a, b)/. No default. -
skipNulls: Whether to include null values in avergae calculations. Defaults to false.
var median = require('filters').average;
var raw = [ 2, 3, 4, 9, 6, 2 ];
console.log(average(raw, 3, 0.5));
// => [ 2, 2.5, 3, 9, 7.5, 2 ]MIT