US Patent RE39645 Compressed image decompressing device

An image processing device which processes a portion of the decompression process including a lot of comparatively complex operations like an inverse discrete cosine transform by software with using a high-performance, general-purpose processor capable of parallel processing, and the other portion of the decompression process which is compara- tively simple but requires frequent access to a memory, e.g., when other frame data is to be read out for processing of encoded interframe predictive image data, or is compara- tively simple but substantially hard to process in parallel, e.g., when variable length coded pixel values are to be decoded, by hardware with the use of a specialized periph- eral circuit.