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DoG小波的对称性图像分类
二面体群 对称性分类 DoG小波变换
2009/7/24
提出了一种DoG小波域的循环群、二面体群对称性图像的识别与分类技术。该技术具有很好的噪声（仅讨论加性的白高斯噪声）鲁棒性特点，甚至在高噪声情况下（例如噪声偏差σ=70），结合修改的脊波变换能实现对噪声图像包含的循环群、二面体群对称性进行识别和分类。
A Model of Fabric Transport in a Sewing Machine Using a Feed Dog Covered with a Supple aterial of Increased Friction
sewing machines fabric transport feed mechanism pressure-feed system.
2009/1/20
In this paper, a mathematical model of a feed mechanism which uses a feed dog covered with supple material is presented. The operation of the pressure-feed system has been described using a system of ...