Content based image retrieval (CBIR) has been an active research area, however, the achievements in image representation and similarity measurement are not satisfying.
基于内容的多媒体信息检索是当前世界的研究热点，然而在图像内容表示及其相似性度量这两个关键问题上取得的进展还不能令人满意。
Mutual information has been widely used in image registration as an effective similarity measure.
互信息是图像配准技术中广泛应用的一种相似性度量方法。
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