Module: SqedUtils

Defined in:
lib/sqed_utils.rb

Overview

Functions that don’t belong in Sqed proper

Class Method Summary collapse

Class Method Details

.corrected_frequency(frequency_stats, width_factor: 3.0, max_width: nil) ⇒ Array

See tests. This code does a rough job of smoothing out boundaries that seem to be biased on one side or the other. Definitely could be refined to use a more weighted approach.

Parameters:

  • frequency_stats (Array) —

    like [1,2,3]

  • width_factor (Float) (defaults to: 3.0)
  • max_width (Integer) (defaults to: nil) —

    required, the width of the image in question

Returns:

  • (Array) —

    like ‘[0,1,2]`



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# File 'lib/sqed_utils.rb', line 24

def self.corrected_frequency(frequency_stats, width_factor: 3.0, max_width: nil)

  return frequency_stats if max_width.nil?

  v0 = frequency_stats[0]
  m = frequency_stats[1]
  v2 = frequency_stats[2]

  width_pct = (v2.to_f - v0.to_f) / max_width.to_f

  return frequency_stats if (width_pct * 100) <= 2.0

  a = (m - v0).abs
  b = (v2 - m).abs

  largest = (a > b ? a : b)

  l = (m - b / 2) 
  l = 0 if l < 0

  r = (m + a / 2)
  r = max_width if r > max_width

  c = a * width_factor
  d = b * width_factor

  [
    c > largest ? l : v0,
    m,
    d > largest ? r : v2
  ]

end