数字工程图会突破二维图纸的模式，直接使用三维数字工程模型。
Digital engineering drawing can use 3d model directly instead of 2d drawing.
提出了一种基于傅立叶描述子的二维工程图的数字水印方法。
Fourier descriptor based digital watermarking method is proposed for 2-dimensional Engineering drawings.
提出了一种基于傅立叶描述子的二维工程图的数字水印方法。
The specific coordinates of vertices in the 2D engineering drawings are extracted to construct correspondence complex signal which is in turn transformed by Fourier transformation.
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