The fast evolution of digital video has brought many new applications. Consequently, research and development of new technologies are greatly needed which will lower the costs of video archiving, cataloging and indexing, as well as improve the efficiency and accessibility of stored videos. Among all possible research areas, video abstraction is one of the most important topics, which helps to enable a quick browsing of a large collection of video data and to achieve efficient content access and representation. There are two fundamentally different types of video abstracts: still- and moving-image abstracts. The still-image abstract, also known as a static storyboard, is a small collection of salient images extracted or generated from the underlying video source. The moving-image abstract, also known as moving storyboard, consists of a collection of image sequences, as well as the corresponding audio abstract extracted from the original sequence and is thus itself a video clip but of considerably shorter length. In this report, we present an overview of major technologies employed by each type of video abstraction, respectively. A list of important players in this research area, from both universities and the industry, is also provided.
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