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Shrinkability maps for content-aware video resizing

Zhang, Yi-Fei, Hu, Shi-Min ORCID: and Martin, Ralph Robert 2008. Shrinkability maps for content-aware video resizing. Computer Graphics Forum 27 (7) , pp. 1797-1804. 10.1111/j.1467-8659.2008.01325.x

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A novel method is given for content-aware video resizing, i.e. targeting video to a new resolution (which may involve aspect ratio change) from the original. We precompute a per-pixel cumulative shrinkability map which takes into account both the importance of each pixel and the need for continuity in the resized result. (If both x and y resizing are required, two separate shrinkability maps are used, otherwise one suffices). A random walk model is used for efficient offline computation of the shrinkability maps. The latter are stored with the video to create a multi-sized video, which permits arbitrary-sized new versions of the video to be later very efficiently created in real-time, e.g. by a video-on-demand server supplying video streams to multiple devices with different resolutions. These shrinkability maps are highly compressible, so the resulting multi-sized videos are typically less than three times the size of the original compressed video. A scaling function operates on the multi-sized video, to give the new pixel locations in the result, giving a high-quality content-aware resized video. Despite the great efficiency and low storage requirements for our method, we produce results of comparable quality to state-of-the-art methods for content-aware image and video resizing.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Computer Science & Informatics
Subjects: Q Science > QA Mathematics > QA76 Computer software
Uncontrolled Keywords: I.4.10 [Computing Methodologies]: Image Processing And Computer Visio
Publisher: Blackwell
ISSN: 0167-7055
Funders: EPSRC
Last Modified: 17 Oct 2022 09:42

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