Fremgangsmåde til kodning med variabel længde, fremgangsmåde til afkodning med variabel længde, lagringsmedium, indretning til kodning med variabel længde, indretning til afkodning med variabel længde og bitstrøm

摘要

The present invention correctly decodes data encoded with a variable-length encoding method that improves the compression ratio. <??>The variable-length encoding method encodes a unit data composed of a plurality of sub-data while referencing parameter tables, and includes the following steps: an initialization step in which an obtained parameter table is set to initial values; a parameter table information encoding step in which information related to the initialized parameter table is encoded; a parameter obtainment step in which encoding parameters to be used in the encoding of sub-data are obtained from the parameter table; a sub-data encoding step in which variable-length encoding of the sub-data is performed with reference to the obtained encoding parameters, and an encoded information placement step in which the encoded information is placed in a position in which the information can be obtained before the encoded unit data. <IMAGE>