Motion compensation and multiresolution coding

Cafforio, C.; Guaragnella, Cataldo; Bellifemine, Fabio; Chimienti, Antonio; Picco, R.

doi:10.1016/0923-5965(94)90011-6

Cited by 19 publications

(4 citation statements)

References 11 publications

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“…However, several researchers have employed MC 3-D DWT with the spatial DWT (SDWT) preceding MC temporal discrete wavelet transform (MC TDWT). Cafforio et al [9] study the problem of compensating for motion directly in the subband domain and propose processing subbands together by means of interpolators with short impulse responses, adapted to each subband and shift value. Campisi et al [10] use a 3-D DWT consisting of two levels of SDWT cascaded with one level of MC temporal Haar DWT for video conference systems.…”

Section: Introductionmentioning

confidence: 99%

A flexible structure for fully scalable motion-compensated 3-D DWT with emphasis on the impact of spatial scalability

Mehrseresht

Taubman

2006

IEEE Trans. on Image Process.

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We investigate the implications of the conventional "t+2-D" motion-compensated (MC) three-dimensional (3-D) discrete wavelet/subband transform structure for spatial scalability and propose a novel flexible structure for fully scalable video compression. In this structure, any number of levels of "pretemporal" spatial wavelet decomposition are performed on the original full resolution frames, followed by MC temporal decomposition of the subbands within each spatial resolution level. Further levels of "posttemporal" spatial decomposition may be performed on the spatiotemporal subbands to provide additional levels of spatial scalability and energy compaction. This structure allows us to trade energy compaction against the potential for artifacts at reduced spatial resolutions. More importantly, the structure permits extensive study of the interaction between spatial aliasing, scalability and energy compaction. We show that where the motion model fails, the "t+2-D" structure inevitably produces misaligned spatial aliasing artifacts in reduced resolution sequences. These artifacts can be removed by using pretemporal spatial decomposition. On the other hand, we also show that the "t+2-D" structure necessarily maximizes compression efficiency. We propose different schemes to minimize the loss of compression efficiency associated with pretemporal spatial decomposition.

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Section: Introductionmentioning

confidence: 99%

A flexible structure for fully scalable motion-compensated 3-D DWT with emphasis on the impact of spatial scalability

Mehrseresht

Taubman

2006

IEEE Trans. on Image Process.

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“…For this kind of information, the most matching block can hardly be obtained by using the general rule of squared error. Literature [3] indicates that the motion compensation in the high frequency frames can increase the energy and variance, which leads to a bad performance. Then, the motion compensation is only performed in the two low frequency frames of each group, the predictive low frequency frame is obtained by motion compensation with the intra low frequency frame.…”

Section: Video Coding Based On 3d-wt and Motion Compensationmentioning

confidence: 98%

A New Video Coding Based on 3d Wavelet Transform and Motion Compensation

Nian¹,

Wu²,

Shi-biao³

2005

Wavelet Analysis and Active Media Technology

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In this paper, the classical algorithm of 3D wavelet transform is improved and a new video coding based on the improved algorithm and motion compensation is proposed. The main difference between the classical algorithm and the new algorithm is the temporal decomposition by wavelet transform. With the new algorithm, video sequence is firstly separated into two groups according to the parity of each frame. Then the improved algorithm for temporal decomposition is applied to each group separately which resulting several high frequency frames and one low frequency frame in each group. After that, the motion compensation is only performed in the two low frequency frames in order to eliminate the interframe redundancies. Experiments results show that the proposed scheme has better coding performance compared with other schemes based on 3D-VVT.

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“…Motion estimation and compensation in wavelet domain [3,7,19], have received much attention due to its superior performance by comparing with the conventional motion estimation in spatial domain. Motion estimation in wavelet domain is basically free from the blocking effects by distributing the distortion over the whole picture due to the global transform nature of the wavelet decomposition.…”

Section: Introductionmentioning

confidence: 99%