Method of encoding a sequence of frames

Details Method of encoding a sequence of frames Method of encoding a sequence of frames

2006-01-03

2006-01-03

Le, Vu (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

Reexamination Certificate

active

06983021

ABSTRACT:
The invention relates to a method for encoding a sequence of frames by means of a three-dimensional (3D) subband decomposition involving a filtering step applied to the frames considered as a 3D volume. The decomposition is applied to successive groups of frames after the implementation, on the frames of each group, of motion estimation and compensation operations in the low frequency temporal subbands at each level of the temporal decomposition, the compensation operation leading, among the filtered pixels, to double-connected pixels corresponding in the current frame to regions of the reference frame becoming uncovered during motion. According to the invention, the identification step of double-connected pixels is followed by a decision step based on a minimization criterion and provided for choosing in the current frame, for the temporal filtering of a double-connected pixel of the reference frame, the pixel that leads to a minimum energy of the detail subband. Moreover, when the temporal part of the 3D decomposition is a temporal wavelet transform that includes a temporal filtering based on the lifting scheme, said temporal filtering includes an overlapped motion compensation using in the prediction step of said scheme an average of pixels from adjacent windows in the reference frame.

REFERENCES:
patent: 5301020 (1994-04-01), Cassereau
patent: 6381276 (2002-04-01), Pesquet-Popescu
“An embedded wavelet video coder using three-dimensional set partitioning in hierarchical trees (SPIHT)”, by B.-J. Kim and W.A. Pearlman, Proceedings of Data Compression Conference, Snowbird, USA, Mar. 25-27, 1997, pp. 251-260.
“Factoring wavelet transforms into lifting steps”, by I. Daubechies and W. Sweldens, Journal of Fourier Analysis applications, vol. 4, No. 3, 1998, pp. 247-269.
“Three-dimensional subband coding with motion compensation”, J.R. Ohm, IEEE Transactions on Image Processing, vol. 3, No. 5, 1994, pp. 559-571.
“Motion-compensated 3D subband coding of video”, S.J. Choi and J.W. Woods, IEEE Trans. on Image Processing, vol. 8, No. 2, pp. 155-164, Feb. 1999.
B. Pesquet-Popescu et al; “Three-Dimensional Lifting Schemes for Motion Compensated Video Compression”, 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No. 01CH37221), Salt Lake Ciyt,UT, May 7-11, 2001, vol. 3, pp. 1793-1796, XP002172582.

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