单向约束 meaning in English

unilateral constraint

System with unilateral constraints
单向约束系
Secondly , two improvements are made in the fuzzy point - matching algorithms . the first is converting matching matrix ' s one - way constraints to two - way constraints , so the situation of modal point - set and target point - set having outliers can be dealt with now
( 2 )对现有的模糊匹配算法进行了改进：首先将匹配矩阵满足的单向约束改成双向的行列约束，从而可以处理模板点集和目标点集都有出格点的情形。