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:
Jan. 20, 2009
Filed:
Feb. 25, 2005
Jiang LI, Beijing, CN;
Keman Yu, Beijing, CN;
Tielin He, Jiangxi Province, CN;
Yunfeng Lin, Beijing, CN;
Shipeng LI, Irvine, CA (US);
Jiang Li, Beijing, CN;
Keman Yu, Beijing, CN;
Tielin He, Jiangxi Province, CN;
Yunfeng Lin, Beijing, CN;
Shipeng Li, Irvine, CA (US);
Microsoft Corp., Remond, WA (US);
Abstract
Generation, coding and transmission of an effective video form, scalable portrait video. As an expansion to bi-level video, portrait video is composed of more gray levels, and therefore possesses higher visual quality while it maintains a low bit rate and low computational costs. Portrait video is a scalable video in that each video with a higher level always contains all the information of the video with a lower level. The bandwidths of 2-4 level portrait videos fit into the bandwidth range of 20-40 Kbps that GPRS and CDMA 1X can stably provide. Therefore, portrait video is very promising for video broadcast and communication on 2.5 G wireless networks. With portrait video technology, this system and method is the first to enable two-way video conferencing on Pocket PCs and Handheld PCs.