ALEXANDRIA, Va., Sept. 3 -- United States Patent no. RE50,573, issued on Sept. 2, was assigned to SUN PATENT TRUST (New York).

"Motion vector calculation method, picture coding method, picture decoding method, motion vector calculation apparatus, and picture coding and decoding apparatus" was invented by Toshiyasu Sugio (Osaka, Japan), Takahiro Nishi (Nara, Japan), Youji Shibahara (Osaka, Japan) and Hisao Sasai (Osaka, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A motion vector calculation method which attains a higher compression rate, includes: a selection step of selecting one of at least one reference motion vector of a reference block; and a calculation step of calculating a motion vector of a ...