define invariant features
Noun. 1. invariant-a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it. characteristic, feature-a prominent attribute or aspect of something; the map showed roads and other features; generosity is one of his best characteristics.otation invariant texture image retrieval based on log-polar and NSCT by Xu, Bing; Li, Zhende; Xie, Shiyi / Journal of Digital Information Management.