基于直线检测的虹膜快速定位方法-深圳大学.PDFVIP

18 8 Vol1 18, No18 200 6 8 J OU RNA L OF COM P UT ER- A IDE D DESIGN COM PU T E R GRA PH ICS A ug1 , 200 6 李 霞 于鲁义 王 娜 ( 5 18060) ( lix ia @ szu. edu. cn ) , , 1 Canny , 1 , , 01 1s, 1 ; ; ; T P391 A Fast Iris Location Algorithm Based on Line Detection Li X ia Y u Luy i Wang N a ( College of I nf ormation Engineering, Shenz hen University , Shenzhen 5 18060) Abstract T he inner and t he outer edges of an iris image in t he Cartesian coordinates are t ransf ormed int o qu as-i lines in the polar coordinat es, w it h the origin of the coordinate t ransf ormat ion being roughly deter- m ined throug h the project ion of the grey- level pixel values1 T hen t he inner circular edge and its cent er are obtained in an iterat ive fashion w it h t he aid of some specially chosen auxiliary point s1 Aft er contrast en- h ancem ent and smoothing preprocessing, t he outer edge is located w it h an improved Canny operator and a curve fitt ing t echnique1 Experimental result s show t hat t he perf orm ance of t he proposed algorit hm is sup er-i or over t he tradit ional method based on line detection, and the averag e t im e for iris location is 011 second, a sat isf act ory rat e for rea-l t ime iris recognit ion1 Key words iris location; circle det ect ion; line det ect ion ; p at tern recognit ion , 0 1 1 , , [ 1] [ 2] 1 D aug man Wildes 1 Daug man , , , , 1 , ; Wildes , , H ough