The parallel edges , vertical edges and diagonal edges are filtered and the correspond fractal dimensions are calculated 計算相應方向上的布朗分形維數,作為紋理特征。
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 邊緣檢測采用了對平行邊緣整體等間隔抽樣,根據斜率對抽樣點集進行再次抽樣后得到擬和點集,用最小二乘法根據擬和點集擬和直線的方法,可以快速精確的檢測到紙幣邊緣,并且能夠處理邊緣有一定程度殘缺的紙幣圖像。