Spotted tongue recognition via cascade filtering

This paper introduces a method for spotted tongue recognition via cascade filtering. The original image is preprocessed and filtered through four characteristics of spot, respectively in position, color, gray and shape. Then, every spotted region is marked with circle using above filter and is used to judge whether a tongue is spotted according to the number of detected spot regions. Experimental results in datasets collected by tongue acquisition system demonstrated that this method has a good performance in identifying both spotted tongue and non-spotted tongue.