In order to complete the granular flowing regime-pattern segregation pattern model, the shape change index Φ was proposed to quantify the transformation process of segregation patterns. The results indicate that Φ can quantify different continuous changes in segregation patterns, and Φ exhibits a stepwise variation with the rotating speed. The stepwise variation feature of Φ indicates that transition patterns occur during the mutual transformation process between core patterns, petal patterns and streak patterns, thereby characterizing the existence of the transition region and its hysteresis phenomena during the segregation pattern transformation process. Finally, it is speculated that the stepwise transition of pattern transformation is related to the relaxation characteristic of the particle stacking structure, while the hysteresis phenomena within the transition region is affected by the memory effect of the particle stacking structure.