Title:
【発明の名称】ビデオ圧縮方法
Document Type and Number:
Japanese Patent JP2003533103
Kind Code:
A
Abstract:
The concept of B-frames gives the MPEG video compression standard its high encoding efficiency. However, B-frame encoding roughly doubles the complexity of an MPEG encoder. In view thereof, MPEG encoders have been developed which produce I-frames and P-frames only. They are less complex but also less efficient. To improve the efficiency of such "IPP encoders", selected P-frames are quantized more coarsely than other P-frames, for example, by multiplying the conventional quantization step size by 1.4. Although this results in isolated frames ("virtual B-frames") being encoded with a lower quality, the overall perceptual quality is not affected. It has been found that the gain in bit rate obtained by the coarser quantization is not lost in subsequent P-frames, even though the subsequent frames are encoded with reference to the lower quality frames.
Inventors:
Bruhls, Wilhelms Harr
Klein Guneweek, Rainier Beam
Klein Guneweek, Rainier Beam
Application Number:
JP2001581546A
Publication Date:
November 05, 2003
Filing Date:
April 13, 2001
Export Citation:
Assignee:
Konin Krekka Philips Electronics NV
International Classes:
G06T9/00; H04N7/26; H04N5/92; H04N7/32; H04N7/50; (IPC1-7): H04N7/32; H04N5/92
Attorney, Agent or Firm:
Tadahiko Ito