Patent ID: 7860325

Claim:
An image processing method comprising: a first processing routine comprising the steps of: acquiring and loading from a first storage device a plurality of tables including a predetermined decompression table and a quantization table necessary to decompress a compressed image data file, the first storage device storing therein the plurality of tables, acquiring and loading from a second storage device a plurality of parameters including a rotation information map and a file pointer created and updated while a compressed image data file is being decompressed, the second storage device storing therein the plurality of parameters, and decompressing a compressed image data file; and a second processing routine comprising the steps of: acquiring and reading the plurality of tables stored in the first storage device and the plurality of parameters stored in the second storage device, and reading and executing a decompression processing program for decompressing a compressed image data file, thereby decompressing a compressed image data file, the decompression processing program being stored in the first storage device; wherein the first processing routine and the second processing routine are used in parallel, and, when a plurality of compressed image data files are decompressed by a parallel processing, one of the plurality of compressed image data files is decompressed using the first processing routine, and the remaining of the plurality of compressed image data files are decompressed using the second processing routine.