Adaptive video prefilter

Details Adaptive video prefilter Adaptive video prefilter

2008-07-01

2008-07-01

Vo, Tung (Department: 2621)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C348S620000, C375S240150

Reexamination Certificate

active

07394856

ABSTRACT:
A method for adaptively filtering a video signal prior to encoding is provided. The method initiates with calculating a local gradient indicative of a region type. Then, a weight factor is determined based upon the local gradient. Next, the weight factor is applied to a difference signal according to the region type. A computer readable media, an integrated circuit and a system for processing an image data signal are also provided.

REFERENCES:
patent: 4561022 (1985-12-01), Bayer
patent: 5253059 (1993-10-01), Ansari et al.
patent: 5260782 (1993-11-01), Hui
patent: 5363213 (1994-11-01), Coward et al.
patent: 5438374 (1995-08-01), Yan
patent: 5552829 (1996-09-01), Kim et al.
patent: 5847766 (1998-12-01), Peak
patent: 5875003 (1999-02-01), Kato et al.
patent: 5881180 (1999-03-01), Chang et al.
patent: 5930397 (1999-07-01), Tsujii et al.
patent: 5933194 (1999-08-01), Kim et al.
patent: 5986710 (1999-11-01), Kim et al.
patent: 6037986 (2000-03-01), Zhang et al.
patent: 6041145 (2000-03-01), Hayashi et al.
patent: 6148027 (2000-11-01), Song et al.
patent: 6175592 (2001-01-01), Kim et al.
patent: 6269123 (2001-07-01), Fujishiro et al.
patent: 6335990 (2002-01-01), Chen et al.
patent: 6356592 (2002-03-01), Naito
patent: 6456328 (2002-09-01), Okada
patent: 2001/0005400 (2001-06-01), Tsujii et al.
patent: 2001/0008544 (2001-07-01), Ishiyama
patent: 2001/0019588 (2001-09-01), Naito et al.
patent: 2001/0035969 (2001-11-01), Kishimoto
patent: 2002/0054637 (2002-05-01), Kato
patent: 2002/0054639 (2002-05-01), Kawashima et al.
patent: 2002/0064228 (2002-05-01), Sethuraman et al.
patent: 2002/0094130 (2002-07-01), Bruls et al.
patent: 2002/0150166 (2002-10-01), Johnson
patent: 2002/0191858 (2002-12-01), Sindhu
patent: 2004/0032906 (2004-02-01), Lillig
patent: 2004/0037465 (2004-02-01), Krause
Pre And Post-Filtering For Low Bit-Rate Video Coding, Nuno Vasconcelos&Frederic Dufaux, pp. 291-294.
Edge Preserving Pre-Post Filtering For Low Bitrate Video Coding, Hideaki Kimata, Yoshiyuki Yashima and Naoki Kobayashi, pp. 554-557.
Lai, Yung-Kai, et al., “Removal of Blocking Artifacts of DCT Transform by Classified Space-Frequency Filtering,” Proceedings of ASIMOLAR-29, Oct. 1995, pp. 1457-1461.

Affiliated with

Also associated with

Rating

Adaptive video prefilter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive video prefilter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive video prefilter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2745432