DocumentCode :
934473
Title :
An efficient content-adaptive motion-compensated 3-D DWT with enhanced spatial and temporal scalability
Author :
Mehrseresht, Nagita ; Taubman, David
Author_Institution :
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Australia
Volume :
15
Issue :
6
fYear :
2006
fDate :
6/1/2006 12:00:00 AM
Firstpage :
1397
Lastpage :
1412
Abstract :
We propose a novel, content adaptive method for motion-compensated three-dimensional wavelet transformation (MC 3-D DWT) of video. The proposed method overcomes problems of ghosting and nonaligned aliasing artifacts which can arise in regions of motion model failure, when the video is reconstructed at reduced temporal or spatial resolutions. Previous MC 3-D DWT structures either take the form of MC temporal DWT followed by a spatial transform ("t+2D"), or perform the spatial transform first ("2D+t"), limiting the spatial frequencies which can be jointly compensated in the temporal transform, and hence limiting the compression efficiency. When the motion model fails, the "t+2D" structure causes nonaligned aliasing artifacts in reduced spatial resolution sequences. Essentially, the proposed transform continuously adapts itself between the "t+2D" and "2D+t" structures, based on information available within the compressed bit stream. Ghosting artifacts may also appear in reduced frame-rate sequences due to temporal low-pass filtering along invalid motion trajectories. To avoid the ghosting artifacts, we continuously select between different low-pass temporal filters, based on the estimated accuracy of the motion model. Experimental results indicate that the proposed adaptive transform preserves high compression efficiency while substantially improving the quality of reduced spatial and temporal resolution sequences.
Keywords :
data compression; discrete wavelet transforms; image resolution; low-pass filters; motion compensation; video coding; video streaming; 3D DWT; compressed bit stream; content-adaptive motion compensation; frame-rate sequences; ghosting artifacts; motion model failure; nonaligned aliasing artifacts; scalable video compression; spatial resolutions; temporal low-pass filtering; temporal resolutions; wavelet transform; Discrete transforms; Discrete wavelet transforms; Frequency; Low pass filters; Motion compensation; Scalability; Spatial resolution; Spatiotemporal phenomena; Streaming media; Video compression; Adaptive scalable video compression; motion compensation; Algorithms; Artifacts; Artificial Intelligence; Data Compression; Image Enhancement; Image Interpretation, Computer-Assisted; Imaging, Three-Dimensional; Information Storage and Retrieval; Motion; Signal Processing, Computer-Assisted; Time Factors; Video Recording;
fLanguage :
English
Journal_Title :
Image Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1057-7149
Type :
jour
DOI :
10.1109/TIP.2005.864236
Filename :
1632195
Link To Document :
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