The RSI improved indicator calculate value of RSI indicator with RSIPeriodOriginal period, and second RSI with RSIPeriodRotated. After that swap rotated one to 180 degree related to 50 poiints (100 RSI). Calculate difference between original indicator and rotated one. And after that calculates derivative of the difference.
RSIPeriodOriginal – original RSI period
RSIPeriodRotated – rotated RSI period