VARIABLE LENGTH DECODING DEVICE, VARIABLE LENGTH DECODING METHOD AND IMAGING SYSTEM

摘要

PROBLEM TO BE SOLVED: To attain reduction of a read processing time by reading a level from a data buffer based on addresses in an address holder.

SOLUTION: In a variable length decoding device, a variable length decoder 3 sequentially decodes variable length coded run length data into Total Coeff, level, total-zeros and run-before. A write controller 8 writes the level to a first data buffer in decoded order. An initial address calculator 5 calculates the initial address of the level from the Total Coeff and the number of zero coefficients of the total-zeros. An address holder holds the address of the level corresponding to data based on the initial address and the number of zero coefficients by the run-before. A read controller 9 reads the level from the first data buffer based on the address information. A selector 10 selects the data of either the level or the zero coefficients based on the address information.

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