IEEE Transactions on Circuits and Systems for Video Technology

Presents a new motion estimation method for low bit-rate image sequence coding that uses a hierarchical decomposition of the current image frame to describe scene motion in terms of displacement and deformation of variable-sized rectangular regions. Because the conventional blockmatching motion compensation method (BMA) can only cope with the problem of translational movement of the scene, some re... View full abstract»

Subband coding and vector quantization combined can provide a powerful method for compressing color images. The use of properties of the human visual system can increase the performance of such a system and allow one to achieve very high quality reconstructed images at compression ratios exceeding 10:1. The authors design a color subband-vector quantization system, and formulate the bit allocation... View full abstract»

One of the major obstacles to the use of vector quantization techniques in practice is the huge design complexity. Huang and Huang (1991, 1992, 1993) and Huang (1991) developed a tree-structured polytopal vector quantization scheme referred to as the principal component vector quantization algorithm (PCVQA). It has been shown that the design complexity of PCVQA is only linearly proportional to the... View full abstract»

Proposes three modifications on the 3-step hierarchical search for video coding: the multiple-candidate search that improves the estimation accuracy, a method of subsampling that reduces computation and input data amount, and an overlapping strategy to improve the accuracy of a large-area search. Experimental results show that combining these techniques provides high-speed and high-precision motio... View full abstract»

A technique for video data compression which combines optimized block truncation coding (OBTC) and a conventional motion compensation (MC) algorithm is presented. It has been shown that the proposed OBTC based system is much better than the conventional system in terms of implementation, complexity, and accuracy. Four benchmark images and two benchmark sequences are used as test examples View full abstract»

Several methods to perform multiresolution transmission of HDTV through subband coding are compared. The first is simple intraframe encoding of the spatial subbands of the video. The authors have used the subband decomposition for both hierarchical estimation of the motion as well as encoding of the compensated error function. They have used block matching for motion estimation on both 2D lowpass ... View full abstract»

A key issue in subband coding is the efficient compression of the less informative but perceptually important upper frequency bands of the decomposed image. A new approach capable of effectively encoding the upper-bands is described. An intra-band vector quantization (VQ) technique is employed for compression of the base-band while the upper frequency bands are encoded by a hierarchical inter-band... View full abstract»

Deals with the design of multichannel Wiener filters both in the spatial and frequency domain. FIR and IIR Wiener filters are presented. Color image restoration based on multi-channel autoregressive (AR) image modeling is examined. Detailed discussions on the use of a multichannel Wiener filter in color image restoration incorporating the interchannel correlations and computer simulations are pres... View full abstract»

Three different versions of a two-layer video coding technique are considered. In the first method the generated bit rate of both layers are variable (VBR-VBR). The second method employs a smoothing buffer and a control mechanism to produce a constant bit rate at the base layer, but that of the second layer is still variable (CBR-VBR). The third method is similar to the second method but the base ... View full abstract»

It is shown that any Reed-Solomon (RS) decoder which corrects both errors and erasures also can be used as an encoder for the RS code. This technique eliminates the need of a separate subsystem, namely the RS encoder in either two-way digital communication systems or storage devices which use RS encoding and decoding. As a consequence a single RS decoder chip which corrects both errors and erasure... View full abstract»

A new hierarchical block matching algorithm with a novel arrangement of data flow is proposed. Its speed can be as fast as that of the conventional hierarchical block matching algorithms and its prediction quality is very close to the full search algorithm. In order to implement this algorithm, a multiprocessor array architecture for real-time processing is proposed. Due to the novel arrangement o... View full abstract»