orientation image meaning in English

定向影像

In our research the following topics are involved : computing the orientation image of a fingerprint image
本研究主要包含以下几个主要方面：求解指纹图像的方向图。
Each pixel in the orientation image stands for the local ridge orientation of a fingerprint . it is the intrinsic characteristics of the fingerprint image
方向图中的每一点反映了指纹图像中局部纹线的方向，他是指纹图像中最本质的特征之一。
After an intensive analysis of several methods of computing the orientation image , we select the " least square estimate " method in our research
我们对多种求解指纹图像方向图的方法进行了深入的分析与比较，并最终选定了“最小平方估计法”作为我们求解指纹图像方向图的方法。
2 ) in the aspect of classification , a new feature vector for classification is developed . this kind of vector can be gotten directly from the orientation images . compared with other classification features , it ' s advantages are computational simplicity and low dimension , so it is more suitable for classification
2 )在分类部分，本论文提出了一种新的用于分类的特征矢量，这种特征可从方向图上直接得到，有着很好的抗噪性，而且计算简单，向量维数小，有利于分类器的正确分类。