As the network and development of multimedia technologies are becoming more popular, users are not satisfied with the traditional information retrieval techniques. So now a day the content based image retrieval using relevance feedback are becoming a source of exact and fast retrieval. The idea of Content-based Image Retrieval (CBIR) using Relevance Feedback systems is to automatically extract image contents based on image features, i. e. color, texture, and shape and store in database and compare input query image feature with the features stored in database. Relevance feedback is applied to reduce the gap between high-level image semantics and low-level image features. Semantic gap is the difference between human perception of a concept and how it can be represented using machine level language.

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Content-based image retrieval Relevance feedback SVM CLD EHD