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:
“Nobody, I think, ought to read poetry, or look at pictures or statues, who cannot find a great deal more in them than the poet or artist has actually expressed. Their highest merit is suggestiveness.”
—Nathaniel Hawthorne (1804–1864)
“For laughter frames the lips of death—
Death frames the Singer and the Song.”
—Allen Tate (1899–1979)