It is an extended ADX and Direction Movement Index indicator with the following changes:
It shows a histogram instead of the DMI lines. If the histogram is green, the DMI+ is above DMI-, otherwise it is red.
You can specify a multiplier for the histogram values to check if values are above threshold. This way you can use the same threshold line as ADX to detect directional strength.
You can remove outliers from ATR calculations
You can use different MAs and sources for DMI and ATR calculations to make ADX more adjustable to different markets
It uses my ADExt library, so you can easily transfer your study to a strategy script.