In order to describe the lip contours in a lip reading system automatically and fleetly,orthogonal compression transformation was applied to the feature extraction of lip contours.

• 为了能够自动而且快速地获取唇读系统中所必需的唇形轮廓特征,提出了将正交压缩变换的方法用于唇形轮廓的特征提取,并对得到的唇形轮廓曲线进行了分析研究。