构建了一种新的局部梯度方向直方图，同时定义了特征点的主方向，从而提出了一种具有旋转不变性的图像配准算法。
A novel gradient orientation histogram was built using a Gaussian-weighted circular window and a major orientation to each feature point was assigned based on local image properties.
提出了颜色—梯度方向角直方图，它能同时表示图像的颜色特征与结构特征，对它的鉴别能力作了较为深入的分析。
The color and structure features of the image can be present at the same time. The identifying ability is analyzed deeply.
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