半径差 meaning in English

difference of radius

According to the fact that iris images cannot be compared for their different resolutions , a new method for normalizing iris region into fixed resolution by using minimum inner boundary resolution and minimum radius difference of inner boundary and outer boundary is presented
摘要针对虹膜区域图像大小不同，难以实现虹膜的比较问题，提出了根据虹膜最小内边界周长确定角度分辨率和根据虹膜最小内、外边界半径差确定径向分辨率的方法，将不同分辨的虹膜图像转换为相同分辨率的矩形区域。