In content-based image retrieval

annotations of image can not only reduce the gap between high-grade semantics and low-grade visual content

but is also convenient for retrieval.As we all know

manual-annotation is time-consuming

strength-consuming

and the annotation results may be subjectively different

while the automatic image annotation can transform the visual features into annotations.This benefits users a lot.In this paper

we propose an instance-based method for automatic image annotation.The advantage...