The Imapct of Low-Level Features in Semantic-Based Image

Abstract

Image Retrieval (IR) is generally known as a collection of techniques for retrieving images on the basis of features, either low-level (Content-based IR) or high-level (Semantic-based IR). Since Semantic-based features rely on low-level ones, in this chapter the reader is initially familiarized with the most widely used low-level features. An efficient way to present these features is by means of a statistical tool capable of bearing concrete information, such as the histogram. For use in IR, the histograms extracted from the previously mentioned features need to be compared by means of a metric. The most popular methods and distances are, thus, apposed. Finally, a number of IR systems using histograms are presented in a thorough manner and their experimental results are discussed. The steps in order to develop a custom IR system, along with modern techniques in image feature extraction are also presented.