Accuracy-scalable motion coding for efficient scalable video compression

Boisson, Guillaume; François, Édouard; Guillemot, Christine

doi:10.1109/icip.2004.1419739

Cited by 6 publications

(6 citation statements)

References 3 publications

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“…The work in [26] assumes that fixed block sizes (or regular meshes) are used in the motion estimation phase. More recently, other works have appeared in the literature [27][28][29], describing coding algorithms for motion fields having arbitrary block sizes specifically designed for wavelet-based scalable video codecs. The algorithm described in this paper has been designed independently and shares the general approach of [26,27], since the motion field is quantized when decoding at low bitrates.…”

Section: Related Workmentioning

confidence: 99%

Motion Estimation and Signaling Techniques for 2D+t Scalable Video Coding

Tagliasacchi

Maestroni

Tubaro

et al. 2006

EURASIP J. Adv. Signal Process.

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We describe a fully scalable wavelet-based 2D+t (in-band) video coding architecture. We propose new coding tools specifically designed for this framework aimed at two goals: reduce the computational complexity at the encoder without sacrificing compression; improve the coding efficiency, especially at low bitrates. To this end, we focus our attention on motion estimation and motion vector encoding. We propose a fast motion estimation algorithm that works in the wavelet domain and exploits the geometrical properties of the wavelet subbands. We show that the computational complexity grows linearly with the size of the search window, yet approaching the performance of a full search strategy. We extend the proposed motion estimation algorithm to work with blocks of variable sizes, in order to better capture local motion characteristics, thus improving in terms of rate-distortion behavior. Given this motion field representation, we propose a motion vector coding algorithm that allows to adaptively scale the motion bit budget according to the target bitrate, improving the coding efficiency at low bitrates. Finally, we show how to optimally scale the motion field when the sequence is decoded at reduced spatial resolution. Experimental results illustrate the advantages of each individual coding tool presented in this paper. Based on these simulations, we define the best configuration of coding parameters and we compare the proposed codec with MC-EZBC, a widely used reference codec implementing the t+2D framework.

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Section: Related Workmentioning

confidence: 99%

Motion Estimation and Signaling Techniques for 2D+t Scalable Video Coding

Tagliasacchi

Maestroni

Tubaro

et al. 2006

EURASIP J. Adv. Signal Process.

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“…[5], [8], [11] introduced a new prediction-based architecture to predict the MV by its neighbor MVs and further proposed a quality scalable MV codec. Boisson et al [7] proposed an accuracy scalable MV coding scheme that partitioned the bit-stream into layers of different accuracy and allowed to decode a MV with less accuracy at lower spatial resolution. Secker et al [4] modeled the impact of motion error on the video distortion and designed the transmission order of MVs.…”

Section: Introductionmentioning

confidence: 99%

“…Wu et al [13] combined the layered structure, alphabet general partition method, and context adaptive binary arithmetic coding to achieve accuracy or quality scalability of MVs. Nevertheless, some of the schemes above are based on implicit models whose parameters are always derived from experiments or empirical results, such as [7]. Some of schemes, such as [4] and [9] set up explicit models in terms of rate-distortion without considering the HVS characteristics.…”

Section: Introductionmentioning

confidence: 99%

Research on Motion Vector Accuracy in Overcomplete Wavelet-Domain Scalable Video Coding Based on Human Visual System Characteristics

Song

Wang

Zhang

2008

2008 the 9th International Conference for Young Computer Scientists

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This paper proposes an accuracy-distortion model for overcomplete wavelet-based scalable motion estimation by exploiting the theory of stationary random process. We first estimate the motion compensation errors in spatial domain due to inaccurate motion vectors, then extend the results to overcomplete wavelet domain, and further derive the errors caused by fraction-pixel motion vectors. Finally, combining with a visibility model of wavelet coefficient errors, this paper proposes a novel algorithm to estimate the motion vector accuracy with which the motion compensation errors will be invisible. Experimental results show that the proposed algorithm is effective in estimating the visually lossless accuracy threshold of motion vectors. The proposed algorithm can be used in scalable coding of motion vectors. Also it can accelerate the motion estimation speed by stopping halfway at the accuracy that will not cause any visible errors.

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“…The third category estimates motion vectors with different accuracy at different spatial resolution. Boisson [19] and Mrak [20] et al proposed accuracy scalable motion vector coding methods that partitioned bitstream into layers with different accuracy. Motion vectors at lower spatial resolution are decoded with less accuracy, and vice versa.…”

Section: Introductionmentioning

confidence: 99%

Visually Lossless Accuracy of Motion Vector in Overcomplete Wavelet-based Scalable Video Coding

Song¹,

Wang²,

Zhang³

2009

JCP

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In this paper, we propose a visually lossless accuracy model for scalable coding of motion vectors in overcomplete wavelet-based scalable video codec. By exploiting theory of stationary random process, we first estimate motion compensation errors in spatial domain due to inaccurate motion vectors. We then extend the results to overcomplete wavelet domain, and further derive the errors caused by fraction-pixel motion vectors. Finally, combining with a visibility model of wavelet coefficient errors, we propose a novel algorithm to estimate the accuracy threshold of motion vectors with which motion compensation errors will be invisible. Experimental results show that our algorithm is effective in estimating visually lossless accuracy threshold of motion vectors. The proposed algorithm can also be used in scalable motion estimation in wavelet domain. It can accelerate motion estimation speed by stopping halfway at the accuracy that will not cause any visible errors.

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Accuracy-scalable motion coding for efficient scalable video compression

Cited by 6 publications

References 3 publications

Motion Estimation and Signaling Techniques for 2D+t Scalable Video Coding

Motion Estimation and Signaling Techniques for 2D+t Scalable Video Coding

Research on Motion Vector Accuracy in Overcomplete Wavelet-Domain Scalable Video Coding Based on Human Visual System Characteristics

Visually Lossless Accuracy of Motion Vector in Overcomplete Wavelet-based Scalable Video Coding

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