Spatial scalability and compression efficiency within a flexible motion compensated 3D-DWT

Mehrseresht, N.; Taubman, David

doi:10.1109/icip.2004.1419743

Cited by 9 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Second, when the video is reconstructed at reduced spatial resolutions, excessive levels of aliasing from the spatial subband transform can cause undesirable visual artifacts. As shown by Mehrseresht and Taubman,15,16 the first problem can be avoided, and the second mitigated, by using full motion compensation, but then undesirable artifacts tend to appear at reduced resolutions wherever the motion model fails. The solution envisaged here is to adaptively switch between the full and safe motion compensation operators, based on the confidence we have in the local motion modeling accuracy.…”

Section: Adaptive Motion Compensationmentioning

confidence: 96%

Fully scalable video compression with sample-adaptive lifting and overlapped block motion

2005

View full text Add to dashboard Cite

Motion compensated temporal lifting is a highly effective means for exploiting motion in wavelet-based video compression algorithms. One way to achieve both spatial and temporal scalability attributes is to apply a conventional spatial DWT to an initial set of temporal subbands. This "t+2D" paradigm may be reversed, performing the spatial transform first and temporally transforming its spatial subbands. In this paper, we show how the two paradigms can be bridged by a family of "vector" motion compensation operators. Different members of this family have different implications for compression efficiency and for artifacts which can appear at reduced resolutions. We show how the vector motion compensation operators can be adaptively selected so as to achieve high compression efficiency, while simultaneously suppressing artifacts which might otherwise occur during scaling. The vector motion compensation paradigm provides an efficient framework for in-band block-based motion modeling, which suppresses the appearance of blocking artifacts. The proposed adaptive motion compensation operators have an added advantage in automatically selecting between different resolutiondependent motion models, so as to maximize energy compaction while avoiding the appearance of artifacts at reduced resolutions. Resolution-dependent motion models extend the useful range of bit-rate scalability over many orders of magnitude.

show abstract

Section: Adaptive Motion Compensationmentioning

confidence: 96%

Fully scalable video compression with sample-adaptive lifting and overlapped block motion

2005

View full text Add to dashboard Cite

show abstract

“…As long as wavelet subband decomposition is used to generate coefficients and bit streams, the proposed synthesis gain matrix is likewise suitable. Only the values in (18) need to be re-evaluated according to the actual down-sampling filter.…”

Section: Derivation Of Synthesis Gain Matrixmentioning

confidence: 99%

Subband Coupling Aware Rate Allocation for Spatial Scalability in 3-D Wavelet Video Coding

Xiong

et al. 2007

IEEE Trans. Circuits Syst. Video Technol.

View full text Add to dashboard Cite

The motion compensated temporal filtering (MCTF) technique, which is extensively used in 3-D wavelet video coding schemes nowadays, leads to signal coupling among various spatial subbands because motion alignment is introduced in the temporal filtering. Using all spatial subbands as a reference enables MCTF to fully take advantage of temporal correlation across frames but inevitably brings drifting problem in supporting spatial scalability. This paper first analyzes the signal coupling phenomenon and then proposes a quantitative model to describe signal propagation across spatial subbands during the MCTF process. The signal propagation is modeled for a single MC step based on the shifting effect of wavelet synthesis filters and then it is extended to multilevel MCTF. This model is called subband coupling aware signal propagation (SCASP) model in this paper. Based on the model, we further propose a subband coupling aware rate allocation scheme as one possible solution to the above dilemma in supporting spatial scalability. To find the optimal rate allocation among all subbands for a specified reconstruction resolution, the SCASP model is used to approximate the reconstruction process and derive the synthesis gain of each subband with regard to that reconstruction. Experimental results have fully demonstrated the advantages of our proposed rate allocation scheme in improving both objective and subjective qualities of reconstructed low-resolution video, especially at middle bit rates and high bit rates.Index Terms-Motion compensated temporal filtering (MCTF), rate allocation, signal propagation model, spatial scalability, subband coupling, 3-D wavelet video coding.

show abstract

“…Although they are widespread in video processing [11][12][13], wavelets are not fully exploited in animation compression. Actually, we observe that the works using wavelets in animation compression [10,14] propose an approach based on spatial wavelets (for static meshes).…”

Section: Problem Statement and Proposed Approachmentioning

confidence: 99%

“…The overall scheme of the compression methods in this domain [2][3][4][5][6][7][8][9][10] is the following: an analysis step first transforms the original geometry to reduce the signal information, and then a predictive coding scheme is applied on the resulting details to exploit the temporal coherence between successive frames. The natural approach for analyzing time-varying data is to exploit the temporal coherence, like in video processing [11][12][13]. Two of the most relevant approaches for animated sequences introduce for instance the principal component analysis to exploit the temporal coherence of the geometry component [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Although wavelets are very popular and particularly efficient in video compression for instance [11][12][13], they are poorly studied in animation compression. Moreover, the two only wavelet-based coders for animated mesh sequences introduce (spatial ) wavelets for static meshes, and consequently their efficiency depends on the parametrical coherence of the mesh sequences [10,14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temporal wavelet-based compression for 3D animated models

Payan

Antonini

2007

Computers & Graphics

View full text Add to dashboard Cite

We present an efficient compression scheme for animated sequences of triangular meshes of the same connectivity. The proposed algorithm exploits the temporal coherence of the geometry component by using a temporal wavelet filtering. The quantization of the resulting wavelet coefficients is then optimized by a bit allocation process. This process dispatches the bit budget across the coefficient subbands according to their influence on the quality of the reconstructed sequence for one specific user-given bitrate. The proposed scheme is simple, fast, flexible, and scalable in frame rate and bitrate. Moreover, simulation results show that our approach is competitive for any kind of animated models, whatever the characteristics (parametrically coherent or not, fine/coarse meshes...), contrary to the related works.

show abstract

Spatial scalability and compression efficiency within a flexible motion compensated 3D-DWT

Cited by 9 publications

References 9 publications

Fully scalable video compression with sample-adaptive lifting and overlapped block motion

Fully scalable video compression with sample-adaptive lifting and overlapped block motion

Subband Coupling Aware Rate Allocation for Spatial Scalability in 3-D Wavelet Video Coding

Temporal wavelet-based compression for 3D animated models

Contact Info

Product

Resources

About