Construction of personal authentication system and the recognition of facial expressions

本研究项目的目的是开发以下三个主题。即：(1)构建基于等密度图的人脸认证系统；(2)构建人脸表情识别系统；(3)利用水印技术开发高精度的个人认证系统。对于第一个方案，尽管还存在一些有待研究的问题，但仍然开发了由个人计算机和常用数字摄像机组成的系统。该方案还提出了一种描述复杂二值图像轮廓的链式编码算法，针对第二种方案，提出了一种从不同角度获取人脸的特征提取算法，识别精度较前一种方法略有提高。对于第三个方案，虽然已经开发出了一些可以应用于链码描述的线条图的算法，但目前还没有实现实际的实现。

The aim of this research project is to develop the following three subjects. That is,(1) Construction of a facial authentication system based on isodensity maps,(2) Construction of the recognition system of facial expressions, and(3)Developing of high accurate personal authentication system using the water marking techniques. For the first project, even though there remain some problems to be investigated, the system consisted of the personal computer and a common used digital video camera was developed. A new chain encoding algorithm for describing contours of complex binary images was also developed in this project.Regarding with the second project, a feature extraction algorithm from the faces taken from various angles was developed and the recognition accuracy was slightly improved compared with the previous method. For the third project, though some algorithms that can be applied to line pictures described by the chain code were developed, however, the practical implementation is not achieved for now.