Almost all the partial scale of aerial photos was measured by using single photo till today.
以往测定航空象片局部比例尺均使用单张象片，本文介绍利用立体象对进行测定的原理和操作方法。
Finally the facial animation with detailed expressions is realized by combing the PERI (Partial Expression Ratio Image).
最后通过结合局部表情比例图(Partial Expression Ratio Image,PERI),实现了具有细微表情特征的真实感人脸动画。