Apparatus for decoding variable-length encoded data

Details Apparatus for decoding variable-length encoded data Apparatus for decoding variable-length encoded data

1988-03-31

1990-10-30

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341107, H03M 742

Patent

active

049671960

ABSTRACT:
Digital image data is encoded using a variable-length code which is described by a group of parameter values. Each parameter value describes a set of code values; each code value corresponds to a possible value of the data which is to be encoded. When the data is encoded, the parameter values are appended to the encoded data. A decoder stores the parameter values into a memory and then combines data values derived from the encoded data with parameter values from the memory to generate decoded data values. Each code word includes a prefix which indicates a number of successive parameter values which are to be summed, and a population index which is to be added to the summed parameter values to produce a decoded data value.

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Abramson, N. Information Theory and Coding, McGraw Hill, 1963, pp. 77-92.

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