ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,483,267, issued on Nov. 25, was assigned to HITACHI LTD. (Tokyo).
"Data compression system and data compression method" was invented by Takahiro Naruko (Tokyo) and Hiroaki Akutsu (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A data compression system compresses original data by a first lossy compression method to generate first compressed data, decompresses the first compressed data to generate first decompressed data, extracts residual information between the original data and the first decompressed data, compresses the residual information by a second lossy compression method different from the first lossy compression method to generate second...