Patent ID: 6023301
Filing Date: 2000-02-08
Classification: H04N

Abstract:
A video codec device for use in a system for encoding and decoding a background video-sequence for forming a background video and a plurality of part-video-sequences for forming a foreground part-video to synthesize each part-video-sequence with the background video-sequence by using weighted mean at a decoding side of the device, comprising:a first video-coding portion for encoding said background video-sequence;a second video-coding portion for encoding said part-video-sequences;an area-information coding portion for encoding bi-level information of area positions and shapes, wherein the area positions and shapes represent positions and shapes of said part-video sequences;a coded-data integrating portion for transmitting the coded bi-level information, and the coded background and part-video sequences to the decoding side;a first video-decoding portion for separating the coded background video-sequence transmitted from the coded-data integrating portion, and for decoding said background video-sequence;a second video-decoding portion for separating the encoded part video-sequences transmitted from the coded-data integrating portion, and for decoding said part-video-sequences;an area-information decoding portion for separating the encoded bi-level information transmitted from the coded-data integrating portion, and for decoding said bi-level information;first and second weighting portions;an adder; andan alpha plane generating portion for generating a multi-level information of an alpha plane from the decoded bi-level information,wherein any of the first weighting portion, second weighting portion or adder synthesizes the decoded background and part-video sequences by using weighted mean according to the generated multi-level information of the alpha plane.