IMAGE PROCESSING APPARATUS, AND IMAGE PROCESSING METHOD

摘要

An image processing apparatus for decoding variable-length encoded image data at a high speed. The image processing apparatus comprises: a variable-length decoding unit for variable-length decoding input data, to output a set of the number of sequential zero coefficients and non-zero coefficients; an inversely quantizing unit for inversely quantizing the non-zero coefficients, to determine and output inversely quantized data; a data storage unit for storing the inversely quantized data at a designated address; an address setting unit for determining the address, at which the inversely quantized data are to be stored, by performing an inverse scan and on the basis of the number of sequential zero coefficients, thereby to designate the address in the data storage unit; a write information storage unit for setting a write flag at its own address corresponding to that address; and a data read unit for outputting the data of the address designated by the address setting unit as it is but for outputting the data at the remaining addresses by replacing them by a predetermined value.