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Wavelet Based Video Coder via Bit Allocation D. Lazar y , A. Averbuch y

Summary: Wavelet Based Video Coder via Bit Allocation
D. Lazar y , A. Averbuch y
y School of Mathematical Sciences, Tel Aviv University, Tel Aviv 69978, Israel
We present a video coder based on a bit allocation scheme for a coding approach where a
wavelet­based video comprssion scheme is used to encode group of frames (GOF). The proposed
new bit allocation method utilizes a Lagrangian multiplier technique to determine the optimal bit
rate for each frame of a given GOF in a rate vs. weighted distortion sense. The proposed based line
coder sequentially employs the following steps: application of the wavelet transform on each frame
in the group. In the wavelet domain an optimal vector bit allocation (rate allocation strategy)
is being used to distribute the bit budget among the frames. The manipulated frames in each
group are quantized and coded using techniques from still image compression. We describe and
demonstrate the performance of the proposed algorithm in wavelet­based coding approaches. The
first one (WCBA) is based on frame differences (FD) and exploits well the wavelet compression
characteristics which keeps, for a given bit budget, the most important features. It does not utilize
motion compensation interpolation or a 3­D wavelet decomposition. In cases where ``heavy'' motion
is detected, we extend WCBA into WCBAM which uses block matching for motion estimation while
the residual error of the compression is reduced by applying error correction in the wavelet domain,
to reduce temporal redundancies.
1 Introduction


Source: Averbuch, Amir - School of Computer Science, Tel Aviv University


Collections: Computer Technologies and Information Sciences