Video compression deals with the
compression of visual
video data.
Video compression is necessary for efficient
coding of video data in
video file formats and
streaming video formats.
Notions:
video is basically a three-dimensional array of color pixels.
Two dimensions serve as spacial (horizontal and vertical) directions of the (moving) pictures and one dimension represents the time domain.
A frame is a set of all pixels that (approximately) correspond to a single point in time.
Basically, a frame is the same as a (still) picture.
However, in interlaced video, the set of horizontal lines with even numbers and the set with odd numbers are grouped together to fields.
The term picture can refer to a frame or a field.
Method:
Video data contains spatial and temporal redundancy.
Video compression removes this redundancy lossy.
Usually this is achieved by:
See also:
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