The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 2010
Filed:
Nov. 29, 2004
Gisle Bjøntegaard, Oppegárd, NO;
Gisle Bjøntegaard, Oppegárd, NO;
Tandberg Telecom AS, Lysaker, NO;
Abstract
The invention is related to video compression systems, and in particular to compression/decompression in digital video systems. The present invention discloses a method for compensating the rounding and truncation error when calculating ½ and ¼ position pixels for motion vector prediction. According to the invention, the rounding/truncation offset is attenuated by properly shifting up or down the result of the calculation of the ½ position pixel values. A method alternating occurrences of converting up and converting down interpolated pixel values to nearest integers in the cases where the pixel values are decimals with fractions of 0.5. In a preferred embodiment, each motion vector is assigned either a first or a second notation, so that converting up or down in a predicted block depends on the assignment of the motion vector corresponding to the prediction block. The present invention is particularly useful in the coding standard H.264/AVC.