Application of improved dual-threshold segmentation for tongue image based on HSI

Tongue inspection is the main content of four diagnostic methods "observation, auscultation and olfaction, interrogation, palpation" for traditional Chinese medical science. Traditional tongue inspection mainly depends on doctor's eyesight and subjective observation to diagnose a disease. It lacks objectivity and hinders further development. It is the only tendency to use computer technology to objective and standard tongue inspection. The tongue split out from the face is the premise for tongue objective. This paper introduces a new dual-threshold segmentation algorithm for tongue image base on HIS.