EPO: Living on Video
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Started by: zoobabzoobab
Date: 15 Apr 2008 09:35
Number of posts: 1
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The main challenge in digitising analogue video signals is to keep the size of resulting files as small as possible to ensure they fit on a disc or chip and are suitable for quick streaming over the internet. In practice, the differences between individual frames of a video broadcast are sometimes quite minimal. Using algorithms that evaluate the differences between frames, Chiariglione's video codecs evaluate the amount of data that needs to be actually digitised and the amount that can be "predicted" mathematically. Samples of the current frame are compared line-by-line with those of the preceding frame, and only the samples considered "sufficiently different" are being stored. Today, all commercial applications of digital video encoding are based on such predictive coding systems to save storage space.
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