首先利用方向模板对图像进行卷积，求得梯度图像。
First, gradient image is constructed by using direction templates convolve with image.
给出一种结合梯度矢量流(GVF)及椭圆变形模板的椭圆提取新算法。
A new ellipse extraction algorithm based on the ellipse-special deformable templates and gradient vector flow (GVF) was proposed.
即首先从原始图像中提取人脸器官梯度图，并建立多姿态知识模型和多姿态模板；
At first, a face organ grads image is extracted from the original image, and multi-pose knowledge models and the multi-pose face templates are set up.
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