In this study, the effect of other expressions other than the lip on the face on understanding and synthesizing what is said was investigated. For example, the words ‘park’, ‘bark’ and ‘mark’ in English can be easily confused. Indeed, only 25% to 30% of the English language can be distinguished by lip reading alone. A professional lip reader takes into account not only lip movements but also spoken subject, facial expression, head movements and grammar. And the most important features that distinguish this research from other lip-to-sound models are that they examine the unique face and speech style of each person and the contextual integrity of the sentence. And it is really being trained with much more data versus other models.
For more please check my blog.