Multiresolution Motion Compensation Research Articles

An enhancement to MRMC scheme in video compression

Zhang and Zafar (see ibid., vol.2, no.3, p.285-96, 1992) proposed a video compression scheme based on the wavelet representation and multiresolution motion compensation (MRMC). An additional masking module is created to further enhance its efficiency. Specifically, between the modules of wavelet decomposition and MRMC, the masking module is inserted which constructs binary images based on the difference of the wavelet coefficients. The binary images serve as masks to facilitate a more efficient motion compensation. Experiments show that the processing time could be significantly reduced from that required for a full search in the original MRMC algorithm.

Multiscale video representation using multiresolution motion compensation and wavelet decomposition

A multiscale video representation using wavelet decomposition and variable-block-size multiresolution motion estimation (MRME) is presented. The multiresolution/multifrequency nature of the discrete wavelet transform makes it an ideal tool for representing video sources with different resolutions and scan formats. The proposed variable-block-size MRME scheme utilizes motion correlation among different scaled subbands and adapts to their importance at different layers. The algorithm is well suited for interframe HDTV coding applications and facilitates conversions and interactions between different video coding standards. Four scenarios for the proposed motion-compensated coding schemes are compared. A pel-recursive motion estimation scheme is implemented in a multiresolution form. The proposed approach appears suitable for the broadcast environment where various standards may coexist simultaneously. >

Motion-compensated wavelet transform coding for color video compression

A variable-block-size multiresolution motion compensation (MRMC) scheme in which the size of a block is adapted to its level in the wavelet pyramid is proposed. This scheme not only considerably reduces the searching and matching time but also provides a meaningful characterization of the intrinsic motion structure. The variable-block-size approach also avoids the drawback of the constant-size MRMC in describing small object motion activities. After wavelet decomposition, each scaled subframe tends to have different statistical properties. An adaptive truncation process is implemented, and a bit allocation scheme similar to that in transform coding is examined. Four variations of the proposed motion-compensated wavelet video compression system are identified, and it is shown that the coding approach has a superior performance in terms of the peak-to-peak signal-to-noise ratio as well as the subjective quality.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>