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One category of fast full-search block matching algorithms (BMAs) is based on the fast Fourier transformation (FFT). In conventional methods in this category, the macroblock size must be adjusted to the search window size by zero-padding. In these methods, the memory consumption and computational complexity heavily depend on the size difference between the macroblock and the search window. Thus, we...
In this paper, we present a simple yet effective fast motion vector search algorithm, called motion codevector (MCV) based search. In a coarse-to-fine manner, two stage codebooks are generated by quantizing motion vector ensemble to generate motion codevector based search pattern, which is expected to follow the true distribution of the motion vectors more closely. Expectation maximization (EM) algorithm...
We propose double-search-window block matching and describe an FFT-based fast algorithm for it. The double-search-window defines two different-sized search windows, an inside-search-window and an outside-search-window, for block-matching. The proposed method achieves the same accuracy as a direct SSD full search in the inside-search-window. It also offers a pseudo-full-search result in the outside-search-window...
In many modern video encoders, motion estimation is usually formulated as a Lagrangian cost function that balances motion prediction accuracy and the rate to transmit motion vectors. In H.264/AVC video encoders, including the H.264 reference software, in an effort to reduce computational complexity, the motion vector rate is often estimated using a look-up table based on universal variable length...
Rate distortion optimization with Lagrangian formulation is widely used in video encoder control and has proved effective in achieving a good trade-off between coding efficiency and computational complexity. It is generally interpreted as a source coding problem with a fidelity criterion. However, this interpretation cannot fully explain the Lagrangian formulation for motion estimation and how to...
Wyner-Ziv video coding is a low complexity video encoding method that exploits source statistics at the decoder and shifts much of the computational complexity from the encoder to the decoder. Many Wyner-Ziv video coding schemes rely on the use of INTRA frames so that the decoder can derive sufficiently accurate side information. In this paper we extend our previous work on Wyner-Ziv coding that uses...
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