In the step of exact location, the district method is adopted in view of the iris edge gradation jumpcharacteristic to accurately to locate the iris the outside edge.
精定位阶段针对虹膜边缘灰度跳变特性采取了分区方法准确定位虹膜的外边缘。
2
The dynamical model of jump vibration is built, the nonlinear dynamical characteristic of jump vibration is studied and find the sub-harmonics vibration is main characteristic.
Quantity of phase jump and wavelength of incident light are correlative with optical characteristic quantity of metal itself when it is reflecting on metal surfaces.