图象的描述。
文字信息在描述图象内容时起着重要的作用，因此文字提取及识别是基于内容视频检索的关键技术。
Text extraction is a key technique in content-based video retrieval as textual information plays an important role in describing the content of image.
根据这种自适应基可以制定一套压缩算法，从而用较少的系数就可以描述纹理图象。
A compression algorithm can be developed exploiting this basis to obtain the most economical representation of the image in terms of textured patterns.
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