Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Patent
1997-10-24
2000-06-20
Lee, Richard
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
348409, 348416, 348420, H04N 712
Patent
active
060786175
ABSTRACT:
An apparatus and method for coding and decoding digital video images, capable of maintaining the quality of static regions, such as background images, in decoded pictures even when the resolution of pictures has been changed from high to low. The apparatus is equipped with two storage units, low-resolution and high-resolution picture storage units, to hold reference pictures in two different picture formats. When processing coded blocks (or blocks having at least one non-zero transform coefficient), a high-resolution picture updating unit converts corresponding blocks of a low-resolution reference picture retrieved from the low-resolution picture storage unit to obtain high-resolution block images. It then updates a high-resolution picture stored in the high-resolution picture storage unit with the obtained high-resolution block images. This updating operation is not applied on non-coded blocks. As a result, only active regions corresponding to the coded blocks are updated within the picture stored in the high-resolution picture storage unit, while the remaining part, which may possibly be static background images, is preserved without losing their high visual quality.
REFERENCES:
patent: 5113255 (1992-05-01), Nagata et al.
patent: 5173773 (1992-12-01), Ueda et al.
patent: 5410307 (1995-04-01), Hekstra et al.
patent: 5412428 (1995-05-01), Tahara
patent: 5418570 (1995-05-01), Ueno et al.
patent: 5475435 (1995-12-01), Yonemitsu et al.
patent: 5504530 (1996-04-01), Obikane et al.
patent: 5805222 (1998-09-01), Nakagawa et al.
patent: 5818531 (1998-10-01), Yamaguchi et al.
Matsuda Kiichi
Morimatsu Eishi
Nakagawa Akira
Fujitsu Limited
Lee Richard
LandOfFree
Apparatus and method for coding and decoding video images does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for coding and decoding video images, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for coding and decoding video images will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1859736