The class of motion estimation algorithms known as backward methods have the advantage of dense motion eld sampling, and in coding applications the decoder needs no motion information from the coder. In this paper, we rst present an overview of operator based motion compensators with interpolative and non-interpolative kernels. We then proceed with two new results. The rst ooers a new perspecti...

We describe a video compression system suitable for teleconferencing applications based on Hierarchical Table-Lookup Vector Quantization and Variable Length Inter-Block Noiseless Coding (VL-IBNC). We apply IBNC selectively to utilize both the inter-frame and intraframe correlation in the video signal. This structure has low encoding and decoding complexity and low bit-rate performance comparabl...

Human faces provide a useful cue in indexing video content. In this paper, we present a highly efficient system that can rapidly detect human face regions in MPEG video sequences. The underlying algorithm takes the inverse quantized discrete cosine transform (DCT) coefficients of MPEG video as the input, and outputs the locations of the detected face regions. The algorithm consists of three sta...

In contrast to conventional video coding, Wyner-Ziv video coders perform simple intra-frame encoding and complex inter-frame decoding. This feature makes this type of coding suitable for applications that require low-complexity encoders. In this paper, we present a model of the coding distortion introduced by pixel-domain WynerZiv video coders. Our distortion model can be used to determine the ...

This paper presents a comparison of H.264/AVC (Advanced Video Coding) based algorithms for compound images that contain text and natural images. Considered the problem of compressing compound images with a novel idea of using a single coder for compressing all the content types, we investigate the algorithm proposed by two models ZQ-CIC and D-CIC models. The coders presented in this study are v...

In motion-compensated lifted wavelet video coding, the calculation of the highpass frame involves interframe prediction. Due to occlusions, or change of intensity, or new objects in the video frame, interframe prediction is not always effective. Intraframe prediction provides an alternative and increases coding efficiency. However, previous analysis shows that these intraframe predicted pixels ...

In this paper, we propose a user-assisted video segmentation algorithm based on color information to alleviate oversegmentation problems. We perform intra-frame segmentation by image simplification, region labeling, and color clustering. In this paper, we also present a discrete three dimensional diffusion model for easy implementation. The statistical property of each labeled region is used to...

The use of digital video is increasing day by day. In the field of Genetic Programming a new approach called “programmatic compression” has been suggested for data compression. In this paper we describe how this technique can be applied to natural video. A programme generating intermediate frames of a video sequence is evolved where each frame is composed by a series of transformed regions from...

This paper proposes a new approach for digital watermarking and secure copyright protection of videos, the principal aim being to discourage illicit copying and distribution of copyrighted material. The method presented here is based on the discrete Fourier transform (DFT) of three dimensional chunks of video scene, in contrast with previous works on video watermarking where each video frame wa...

This paper proposes the use of a modified Wiener digital restoration technique for multiframe image sequences that are degraded by both blur and noise. The proposed multichannel Wiener restoration filter accounts for both intra-frame (spatial) and inter-frame (temporal) correlation. A modified cross-correlation formula between consecutive frames, which directly utilizes the motion vectors in th...