A comprehension of contemporary effort for tracking of lip

Abstract

Lip tracking exercise is the most important pre-requisite for lip reading system. Most of the lip reading procedures are accessible based on lip contour analysis. Similarly, lip contour extraction is a fundamental footstep. As a result of lip contour extraction, initially the process of lip contour detection in the first frame of an audio-visual image sequence. Subsequently capturing contour in successive frames based on methods of automatic, semiautomatic and hybrid is normally named as lip tracking. Here the effort presents an overview of contemporary works on extracting the face from digital video and classified the face into lip area and non-lip area by categorising the approaches into low and high-level processing techniques. Furthermore, the comparative study of approaches and their effectiveness based on various factors like asymmetric lips, the mouth with visible teeth, tongue and mouth with mustache are offered.