提出了基于BAG结构的轮廓提取算法，并在此基础上又提出了提取字符形状特征(改进方向码)的方法。

The algorithm to extract the outline based on the BAG structure was proposed. On the basis of these, the shape feature (the improved direction code) were obtained.

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在特征表示方面，用形状签名代替链码来描述轮廓，从而提高了计算速度，降低了由噪声干扰和镜头形变造成的影响。

The chain code was replaced by the shape signature and used to express the contour, improve the speed and decrease the effect of noise and transformation due to camera calibration.

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