IEEE Transactions on Circuits and Systems for Video Technology

An examination of the distribution of signals within the prediction loop of an interframe video codec reveals that small random fluctuations caused by the quantizer build up over a period of time. This quantization noise circulates within the prediction loop causing a gradual decrease in the signal to noise ratio of the reconstructed sequence and an increase in the required data rate. In general, ... View full abstract»

The three-step search (TSS) algorithm has been widely used as the motion estimation technique in some low bit-rate video compression applications, owing to its simplicity and effectiveness. However, TSS uses a uniformly allocated checking point pattern in its first step, which becomes inefficient for the estimation of small motions. A new three-step search (NTSS) algorithm is proposed in the paper... View full abstract»

The paper describes fully pipelined parallel architectures for the 3-step hierarchical search block-matching algorithm, a fast motion estimation algorithm for video coding. The advantage of this algorithm was completely utilized by use of intelligent data arrangement and memory configuration. Techniques for reducing interconnections and external memory accesses were also developed. Because of thei... View full abstract»

Multi-point ISDN videoconferencing with video bridging in network-based servers represents a viable new network service. The paper presents a detailed technical analysis of a continuous presence video bridge using the H.261 video coding standard. The authors first compare the pros and cons of coded domain versus pel domain video bridges. The architecture and the required operations of a coded doma... View full abstract»

The authors mathematically analyze the drift of low-resolution images obtained from a smaller IDCT of a subset of the DCT coefficients of the full-resolution images in motion-compensated hybrid predictive/DCT coding such as MPEG-2, which allows for frequency scalability. Using this mathematical structure, they derive a low-resolution decoder that has the theoretically minimum possible drift, and p... View full abstract»

Discusses the problem of multiplexing several variable rate encoded streams into a single stream. Moreover, in order to facilitate editing of the resulting stream it is required that data generated during the same time interval is multiplexed together. Particular emphasis is placed on controlling encoder rates and combining data in such a way as to avoid overflow and underflow of buffers at encode... View full abstract»

Applications of three-dimensional (3D) LCR prototype networks in the design of 3D recursive filters are reviewed and several types of new and useful 3D LCR prototype filters are proposed and classified. These 3D LCR prototype filters can be used to design 3D recursive filters for the processing of image sequences involving 3D spatio-temporal-domain linear-trajectory (LT) and planar-wave (PW) compo... View full abstract»

Studies vector transform coding (VTC), a new image coding scheme, on subband-decomposed images. It is shown that vector transformation (VT) reduces the inter-vector correlation, although not as much as the discrete cosine transform (DCT). However, it is also shown that VT preserves the intra-vector correlation much better than the DCT so that vector quantization (VQ) in the VT domain can be made m... View full abstract»