Abstract: Adjusting human facial model is a key step in model-based face synthetic technologies.Adjusting the characteristic region of facial wire frame model in detail is important to the fidelity of obtained virtual human face.So，a method to adjust the characteristic region in detail automatically is proposed in this paper.First，the convex hull points of the characteristic region such as eyes，mouth etc. are confirmed，and，the integral contour points are obtained by fitting the curve.Then，the coordinate of the contour and the corresponding points of the adapted facial model are transformed to a new coordinate.At last，the model is adjusted in the new coordinate to get a good adaptation between the human facial model and human face image by revising the corresponding detail data in the model.The experimental results show its validity in improving the model adaptation in detail.

摘要： 人脸网格模型的调整是基于模型人脸合成技术的关键步骤，获得的虚拟人脸能否逼真地模拟真实人脸，其特征区域的细节调整是非常重要的。为此，提出了一种自动调整模型特定区域细节的方法。首先，对检测出的眼睛、嘴巴等特征区域，确定出其外凸包点集，通过曲线拟合得出其完整外轮廓，然后对此轮廓点以及已经粗调的对应模型点进行坐标转换，在转换后的坐标系中，对模型中相应的细节数据进行修改，实现模型和人脸图像的配准。实验结果表明，该算法在提高模型细节匹配上有明显的改善效果。