Mergence of multi ocular fundus images is often needed for clinic and research.

由于眼底照相机的拍摄角度有限，每一次成像所包含的区域相对于整个眼底来说是比较小的，在临床和实验研究中常常需要把多幅眼底图像拼接起来。

“Artistic conception”is a category of Chinese classic aesthetics which means unification of scenery and emotion, as well as mergence of image and mind . The form, which is limited ,vivid and external, contains infinite, plentiful and profound artistic connotation.

“意境”这个百分之百纯粹中国的传统美学典范,讲求情景融合和形神统一,使有限、生动、鲜明的个别形式蕴涵无限、丰富、深广的艺术内容。

The critical distance for mergence is 300 km for symmetric vortices and 400 km for quasi-symmetric vortices, while the situation becomes complicated for asymmetric vortices with the critical distance changing with the asymmetric distributions.

线性条件下,准对称分布状态的临界距离是300km;非线性条件下,准对称分布状态的临界距离是400km;在非轴对称状态下,同样的临界距离双涡并不一定合并。