Moving image coding apparatus, moving image decoding...

Details Moving image coding apparatus, moving image decoding... Moving image coding apparatus, moving image decoding...

2011-06-07

2011-06-07

Ahmed, Samir A (Department: 2624)

Image analysis

Image compression or coding

Interframe coding

C382S232000, C382S239000, C375S240120, C375S240130, C375S240190

Reexamination Certificate

active

07957604

ABSTRACT:
In this invention, even if final code data is to be generated by selectively discarding code data for each bitplane, errors due to bitplane rounding down operation can be suppressed from being gradually accumulated in predicted data such as P- and B-pictures, thereby preventing a deterioration in image quality. For this purpose, a block segmentation unit (31) segments an input frame into a plurality of blocks, and supplies the respective blocks to a difference computing unit (32). The difference computing unit (32) outputs the blocks to a DWT unit (33) without any change when the intra-frame coding mode is set. When the inter-frame coding mode is set, the difference computing unit (32) outputs the result obtained by computing a difference from predicted data from a motion compensation unit (42) to the DWT unit (33). The frequency component data obtained by the DWT unit (33) and a quantization unit (34) is entropy-coded by an entropy coding unit (35), and a bitplane formed by bit information at the bit position of each component value is coded. A bitplane round-down unit (36) rounds down the code data of bitplanes from the least significant position to an upper bit position such that the resultant code amount becomes equal to or less than a target code amount. A code forming unit then generates code data. Only when the intra-frame coding mode is set, a dequantization unit (39) and inverse DWT unit (40) are executed to update a frame memory (41).

REFERENCES:
patent: 4974071 (1990-11-01), Maeda
patent: 5359438 (1994-10-01), Maeda
patent: 5371606 (1994-12-01), Katayama et al.
patent: 5450209 (1995-09-01), Niimura et al.
patent: 5521717 (1996-05-01), Maeda
patent: 5933249 (1999-08-01), Shimura et al.
patent: 5982435 (1999-11-01), Tong et al.
patent: 6067382 (2000-05-01), Maeda
patent: 6169821 (2001-01-01), Fukunaga et al.
patent: 6205252 (2001-03-01), Nguyen et al.
patent: 6272180 (2001-08-01), Lei
patent: 6282240 (2001-08-01), Fukunaga et al.
patent: 6307886 (2001-10-01), Westermann
patent: 6351491 (2002-02-01), Lee et al.
patent: 6396955 (2002-05-01), Abe
patent: 6480547 (2002-11-01), Chen et al.
patent: 6486981 (2002-11-01), Shimura et al.
patent: 6512793 (2003-01-01), Maeda
patent: 6643382 (2003-11-01), Maeda
patent: 6697521 (2004-02-01), Islam et al.
patent: 6763071 (2004-07-01), Maeda et al.
patent: 6798977 (2004-09-01), Maeda
patent: 6968088 (2005-11-01), Maeda et al.
patent: 7072404 (2006-07-01), Itokawa
patent: 7162101 (2007-01-01), Itokawa et al.
patent: 2002/0031182 (2002-03-01), Kishi
patent: 2002/0037048 (2002-03-01), Van Der Schaar et al.
patent: 2002/0154823 (2002-10-01), Okada
patent: 2004/0005095 (2004-01-01), Wu et al.
patent: 2005/0013365 (2005-01-01), Mukerjee et al.
patent: 2006/0013304 (2006-01-01), Maeda et al.
patent: 2007/0098073 (2007-05-01), Maeda
patent: 2007/0110158 (2007-05-01), Maeda
patent: 2007/0160299 (2007-07-01), Kajiwara et al.
patent: 763944 (1997-03-01), None
patent: 763944 (1999-03-01), None
patent: 1 233 625 (2002-08-01), None
patent: 2318244 (1998-04-01), None
patent: 02-309777 (1990-12-01), None
patent: 03-006187 (1991-01-01), None
patent: 04-207280 (1992-07-01), None
patent: 05-191800 (1993-07-01), None
patent: 07-095571 (1995-04-01), None
patent: 09-149421 (1997-06-01), None
patent: 10-023411 (1998-01-01), None
patent: 10-126794 (1998-05-01), None
patent: 2000-125304 (1998-10-01), None
patent: 11-275585 (1999-10-01), None
patent: 2000-013797 (2000-01-01), None
patent: 2001-112004 (2001-04-01), None
patent: 2002-34043 (2002-01-01), None
patent: 2002-325257 (2002-11-01), None
patent: 2003-115765 (2003-04-01), None
patent: 2004-056632 (2004-02-01), None
“Latest MPEG Textbook”, ASCII Publishing, pp. 74-76, 1994.

Affiliated with

Also associated with

Rating

Moving image coding apparatus, moving image decoding... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Moving image coding apparatus, moving image decoding..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Moving image coding apparatus, moving image decoding... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2735596