Quality Of Service (QoS) - Video

Video Quality

Video quality is the ability of a display or video transfer system to recreate the key characteristics of an original video signal.

Similar to Audio quality, some of these factors that affect video quality include the video codecs, transmission type and bandwidth limitations. The types of distortion on analog video systems include blurriness and edge noise. Digital video and transmission system impairments include tiling, error blocks, smearing, jerkiness, edge busyness and object retention.

Tiling is the changing of a digital video image into square tiles that are located in positions other than their original positions on the screen. Error blocks are groups of a block of pixels that do not represent error signals rather than the original image bits that were supposed to be in that image block. Jerkiness is stalling or skipping of video image frames or fields. Object retention is the retention of a portion of a frame when the image has changed.