JITTER
JOG
JPEG/MPEG
JITTER
(рус. Джиттер)
A term describing instability on the time axis. In video, jitter appears as image vibration and breakdown. Special, mainly digital equipment, is used to correct jitter (see TBC). Jitter is far more important for digital video signals – SDI signals for example. Digital clock jitter that accumulates along a video transmission line can create an abrupt signal loss (Cliff Effect) and special electronic circuitry is needed to restore stability (see Reclocking).
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JOG
A control available on high quality VCRs to view individual fields or frames of a tape.
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JPEG/MPEG
Joint Picture Experts Group / Motion Picture Experts Group. Standards of storage and retrieval of compressed still and moving video scenes, as used in multimedia video and computer graphics applications. The standards are based on specific hardware and software algorithms. The JPEG compression system is able to compress graphics files at a 75:1 compression ratio or even more, and can greatly reduce a 24-bit color image for easy storage and transfer.
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