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276 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 12, NO. 4, APRIL 2002 Multiframe Blocking-Artifact Reduction for Transform-Coded Video
 

Summary: 276 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 12, NO. 4, APRIL 2002
Multiframe Blocking-Artifact Reduction for Transform-Coded Video
Bahadir K. Gunturk, Yucel Altunbasak, and Russell M. Mersereau
Abstract--A major drawback of block-based still-image or
video-compression methods at low rates is the visible block bound-
aries that are also known as blocking artifacts. Several methods
have been proposed in the literature to reduce these artifacts.
Most are single image methods, which do not distinguish between
video and still images. However, video has a temporal dimension
that can lead to better reconstruction if utilized effectively. In
this paper, we show how to combine information from multiple
frames to reduce blocking artifacts. We derive constraint sets
using motion between neighboring frames and quantization infor-
mation that is available in the video bit stream. These multiframe
constraint sets can be used to reduce blocking artifacts in an
alternating-projections scheme. They can also be included in
existing set-theoretic algorithms to improve their performance by
narrowing down the feasibility set. Experimental results show the
effectiveness of using these multiframe constraint sets.
Index Terms--Blocking-artifact reduction, dequantization, mul-

  

Source: Altunbasak, Yucel - School of Electrical and Computer Engineering, Georgia Institute of Technology

 

Collections: Engineering