filters

filters 
=======

This module implements 1D noise reduction filters. There are currently two
available:

- median filter

- rolling average with threshold

median
------

``javascript
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 to 3.

$3

`javascript
var median = require('filters').median;
var raw = [ 2, 3, 4, 9, 6, 2 ];
console.log(median(raw));
// => [ 2, 3, 4, 6, 6, 2 ]
`

average
-------

`javascript
average(data, windowSize, threshold)
`

- data: An array of numbers.

- windowSize: The size of the rolling average window. Should be two or
greater, defaults to 3.

- 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.

$3

`javascript
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 ]
``

License
-------

MIT