Vertical Horizontal Filter (VHF)

Interpretation / Algorithm
Technical Analysis Studies [prophet.net]
Vertical Horizontal Filter with Metastock screenshot [paritech.com]
Description with math formula [FMLabs.com]
Technical Analysis A to Z by Steven B. Achelis [equis.com]

Product Implementation	Function / Formula / Script / Source Code
Genius Trader [geniustrader.org]	PERL Script - GT::Indicators::VHF [geniustrader.org]
Wealth-Lab [wealth-lab.com]	ChartScripts using VHF [wealth-lab.com]