Dale - Computer Science Illuminated 80

Dale - Computer Science Illuminated 80 - 3.1 Data and...

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Compression ratio The size of the compressed data divided by the size of the uncompressed data Lossless compression A technique in which there is no loss of infor- mation Lossy compression A technique in which there is loss of informa- tion Analog data Informa- tion represented in a continuous form Digital data Information represented in a discrete form 3.1 Data and Computers 53 restrictions that define the maximum number of bits or bytes that can be transmitted from one place to another in a fixed amount of time. The compression ratio gives an indication of how much compression occurs. The compression ratio is the size of the compressed data divided by the size of the original data. The values could be in bits or characters or whatever is appropriate as long as both values are measuring the same thing. The ratio should result in a number between 0 and 1. The closer the ratio is to zero, the tighter the compression. A data compression technique can be
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This note was uploaded on 01/13/2011 for the course CSE 1550 taught by Professor Marianakant during the Fall '10 term at York University.

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