基于小波域图像不变矩的图纸一致性检测

审图系统中，需要对报送的工程图纸和已有的电子图纸进行一致性检测。为此，提出了基于小波变换和图像不变矩的图纸一致性检测算法。该算法首先利用仿射变换对预处理后的工程图纸进行图纸配准，然后利用小波变换对扫描图纸和电子图纸实现小波分解，简化比对的计算量，并利用图像不变矩的平移、尺度和旋转不变特性，作为图纸比对的准则。实验结果表明，此算法能很好地实现审图系统中图纸的一致性检测。

Checking consistency between drawings based on image invariant moments in wavelet domain

Checking consistency between the scanned drawing and the electronic drawing is required in the flow of electronic declaring. The approach of checking consistency between drawings in drawings audit system based on wavelet transform and image invariant moments was presented for solving this problem. Firstly, the scanned drawings were processed by affine transform in order to achieve image registration. Secondly, the scanned drawing and the electronic drawing were decomposed by wavelet transform, which could reduce the complexity of the computation. Finally, checking consistency between drawings could be completed using the traits of invariant moments, such as shift, rotation and scale invariant. The experimental results show that the proposed algorithm can well check the consistency between drawings.