The parallel edges , vertical edges and diagonal edges are filtered and the correspond fractal dimensions are calculated 计算相应方向上的布朗分形维数,作为纹理特征。
We sample from parallel edges in equal distance , and we sample again from sample points set by slope and get fitting points set , then we use least square method to fit straight line with the fitting points set . the edges of paper currency image can be detected accurately and quickly by above method , and it is valid to some image with a certain defection 边缘检测采用了对平行边缘整体等间隔抽样,根据斜率对抽样点集进行再次抽样后得到拟和点集,用最小二乘法根据拟和点集拟和直线的方法,可以快速精确的检测到纸币边缘,并且能够处理边缘有一定程度残缺的纸币图像。