长弦 meaning in English

long-chord

The proposed method accurately and fleetly locates the inner boundary of the iris by means of detecting the diameter of the pupil in the binary image . then , the outer boundary is detected by a deformable circular template
它利用了虹膜瞳孔的生理特征,在二值化后的虹膜图像中寻找水平最长弦,从而定位瞳孔的大致位置,在此基础上经过进一步的细化提取准确的瞳孔中心位置。
The main research includes following parts : 1 . owing to the shortcoming of the parameter accumulation operation and the slow operation speed of traditional iris localization algorithms , this dissertation investigates a fast algorithm for iris localization based on the detection of the longest chord
主要研究内容包括以下几个方面: 1 .针对传统虹膜定位方法速度慢,需要参数累加计算等缺点,提出了结合虹膜灰度特点的最长弦检测的快速虹膜定位方法。