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visual word
In Image Retrieval system, Visual Words can be represented by small parts of an image which carry some kind of information related to the features (such as the color, shape or texture), or changes occurring in the pixels such as the filtering, low-level feature descriptors (SIFT, SURF, ...etc.).
== History ==
The approaches of text Retrieval system (or Information Retrieval IR system 〔), which developed over 40 years, are based on keywords or Term. The advantage of these approaches is particularly due to the fact that they are effective and fast. Text-search engines are able quickly to find documents from hundreds or millions (by using Vector space model ). In the same time of that, Text Retrieval Systems have a huge success, the standard image retrieval systems (like simple search by colors, shapes...etc.) have a large number of limitations. Consequently, researchers try to take advantage from text retrieval techniques to apply them to image retrieval. That can be by a new kind of vision to understand images as textual documents, which is Visual Words approach.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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