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Visual Word
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<p>Visual words, as used in <a href="/facts/Image_retrieval/pkcq1rTk">image retrieval</a> systems, refer to small parts of an image that carry some kind of information related to the features (such as the color, shape, or texture) or changes occurring in the <a href="/facts/Pixels/UzwBvXBV">pixels</a> such as the filtering, low-level feature descriptors (<a href="/facts/Scale-invariant_feature_transform/oX14fcpr">SIFT</a> or <a href="/facts/Speeded_up_robust_features/8yNYo6Kn">SURF</a>). </p>