Trading Channel Index aka WaveTrend Oscillator

Did some research on the WaveTrend Oscillator [WT] from LazyBear, Tradingview indicator. The original indicator is called the Trading Channel Index.

My version is slightly different from LazyBear, my signal line is a Finite Impulse Response Filter compared to the original being a standard simple moving average.

I then subtract the Trading Channel Index line from the signal line to produce a color histogram. This could be improved by introducing a smoothing line to the produced histogram data.