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Saturday, May 28, 2011

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Video formats
There are different layers of video transmission and storage, each with its own set of formats to choose from.
For transmission, there is a physical connector and signal protocol ("video connection standard" below). A given physical link can carry certain "display standards" which specify a particular refresh rate, display resolution, and color space. There are a number of analog and digital tape formats, though digital video files can also be stored on a computer file system which have their own formats. In addition to the physical format used by the storage or transmission medium, the stream of ones and zeros that is sent must be in a particular digital video "encoding", of which a number are available.

Video quality
Video quality can be measured with formal metrics like PSNR or with subjective video quality using expert observation.
The subjective video quality of a video processing system may be evaluated as follows:
* Choose the video sequences (the SRC) to use for testing.
* Choose the settings of the system to evaluate (the HRC).
* Choose a test method for how to present video sequences to experts and to collect their ratings.
* Invite a sufficient number of experts, preferably not fewer than 15.
* Carry out testing.
* Calculate the average marks for each HRC based on the experts' ratings.
any subjective video quality methods are described in the ITU-T recommendation BT.500. One of the standardized method is the Double Stimulus Impairment Scale (DSIS). In DSIS, each expert views an unimpaired reference video followed by an impaired version of the same video. The expert then rates the impaired video using a scale ranging from "impairments are imperceptible" to "impairments are very annoying.


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