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:
“Every individual, like a statue, develops in his life the laws of harmony, integrity, and freedom; or those of deformity, immorality, and bondage. Whether we wish to or not, we are all drawing our own pictures in the lives we are living ...”
—Harriot K. Hunt (1805–1875)
“The bird would cease and be as other birds
But that he knows in singing not to sing.
The question that he frames in all but words
Is what to make of a diminished thing.”
—Robert Frost (1874–1963)