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Extra info for IEEE Standard Codecs Image Compression To Advanced Video Coding
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This was despite the fact that pictures were coded at one or two frames per second, and waiving hands in front of the camera would freeze the picture for a few seconds, or cause a complete picture break-up. 5 frames per seconds, without picture freeze, does not look attractive. As another example, most people might be quite satisfied with the quality of the broadcast TV at home, both analogue and digital, but if they watch football spectators on a broadcast TV side by side with an HDTV video, they then realise how much information they are missing.
The more likely symbols reduce the range less than the less likely ones and hence they contribute fewer bits to the message. To explain how arithmetic coding works, a fixed model arithmetic code is used in the example for easy illustration. 4. 9) ! 0) Once the symbol probability is known, each individual symbol needs to be assigned a portion of the [0, 1) range that corresponds to its probability of appearance in the cumulative density function. Note also that the character with a range of [lower, upper) owns everything from lower up to, but not including, the upper value.
In this method subjects are asked to continuously evaluate the video quality of a set of video scenes. The judgement criteria are the five scales used in the DSCQS above. Since video sequences are long, they are segmented into ten seconds shots, and for each video segment an MOS is calculated. Although these methods give reliable indications of the perceived image quality, they are unfortunately time consuming and expensive. An alternative is objective measurements, or video quality metrics, which employ some mathematical models to mimic human visual systems behaviour.