Pictures/Frames
While the terms "frame" and "picture" are often used interchangeably, strictly speaking, the term picture is a more general notion, as a picture can be either a frame or a field. A frame is a complete image captured during a known time interval, and a field is the set of odd-numbered or even-numbered scanning lines composing a partial image. When video is sent in interlaced-scan format, each frame is sent as the field of odd-numbered lines followed by the field of even-numbered lines.
Frames that are used as a reference for predicting other frames are referred to as reference frames.
In such designs, the frames that are coded without prediction from other frames are called the I-frames, frames that use prediction from a single reference frame (or a single frame for prediction of each region) are called P-frames, and frames that use a prediction signal that is formed as a (possibly weighted) average of two reference frames are called B-frames.
Read more about this topic: Video Compression Picture Types
Famous quotes containing the words pictures and/or frames:
“Sam Goldwyn said, “How’m I gonna do decent pictures when all my good writers are in jail?” Then he added, the infallible Goldwyn, “Don’t misunderstand me, they all ought to be hung.” Mr. Goldwyn didn’t know about “hanged.” That’s all there is to say.”
—Dorothy Parker (1893–1967)
“... though it is by no means requisite that the American women should emulate the men in the pursuit of the whale, the felling of the forest, or the shooting of wild turkeys, they might, with advantage, be taught in early youth to excel in the race, to hit a mark, to swim, and in short to use every exercise which could impart vigor to their frames and independence to their minds.”
—Frances Wright (1795–1852)