In error correction schemes, storing the same data more than once or in more than one way so that the additional information can be used to reconstruct any data lost because of media imperfections or transmission errors. (7/96)

The addition of data that makes error checking and correction possible when associated with a set of primary data. Redundancy techniques allow the reconstruction of information when a portion of the data is erroneously transferred.

More than one copy of the same data.

Information in an image which is either not required for interpretation or cannot be seen. Redundancy may be spatial or spectral. It also refers to multi-spectral data where the degree of correlation between bands is so high than one band contains virtually the same information as all of the bands.

In a data transmission, the fragments of characters and bits that can be eliminated with no loss of information.

The amount of that can be eliminated from an item of data without losing the information to be conveyed.

Redundancy in information theory is the number of bits used to transmit a message minus the number of bits of actual information in the message. Data compression is a way to eliminate unwanted redundancy, while checksums are a way of adding desired redundancy for purposes of error correction when communicating over a noisy channel of limited capacity.