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US 9,179,143 B2Granted
Compressed video
AssigneeForbidden Technologies PLC
InventorStephen Bernard Streater
Life of this patent
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Abstract
A method of compressing digital data comprising the steps of: (i) reading digital data as series of binary coded words representing a context and a codeword to be compressed; (ii) calculating distribution output data for the input data and assigning variable length codewords to the result; and (iii) periodically recalculating the codewords in accordance with a predetermined schedule, in order to continuously update the codewords and their lengths.
Claims4
A method of compressing digital data for storage or transmission, comprising the steps of:
- (i) reading inputted digital data as series of binary coded words representing a context and an input codeword to be compressed;
- (ii) calculating distribution output data for the inputted digital data and generating variable length prefix codewords for each combination of context and input codeword and generating a respective sorted transition table of variable length prefix codewords for each context, in a manner in which codeword space at the long end is left available to represent new input codewords, which have not yet occurred with corresponding contexts, as they occur;
- and
- (iii) repeating the process of step (ii) from time to time;
- (iv) whereby the inputted digital data can be subsequently replayed by recalculating the sorted transition table of local codewords at corresponding times in the inputted digital data.
2 more elements
Dependencies are inferred from the claim text.