Video Graphics Adapter. A video adapter introduced in 1987. The VGA duplicates all video modes of the EGA (Enhanced Graphics Adapter) and provides several additional modes.

VRC Vertical redundancy check. An error-checking method that adds a check or parity bit to each character in a message so the number of 1 bits, including the parity bit, in each character is odd (odd parity) or even (even parity).

employ video cameras for inspection, verification, measurement, code reading and other purposes. Vision systems employ sophisticated pattern-recognition software to analyze the images they capture and compare it against defined patterns.