Journal ArticleDOI
Motion-compensated television coding: Part I
Arun N. Netravali,J. D. Robbins +1 more
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TLDR
Methods of estimating displacements of moving objects from one frame to the next in a television scene and using such displacements for frame-to-frame prediction by a recursive algorithm are presented which make it attractive for hardware implementation.Abstract:
We present methods of estimating displacements of moving objects from one frame to the next in a television scene and using such displacements for frame-to-frame prediction. Displacement is estimated by a recursive algorithm which seeks to minimize a functional of the prediction error. Several simplifications of the algorithm are presented which make it attractive for hardware implementation. Performance of the algorithm is evaluated by computer simulations on two sequences of moving images containing various amounts and types of motion. In both cases, the use of displacement-based (or motion-compensated) prediction results in bit rates that are 22 to 50 percent lower than those obtained by simple “frame-difference” prediction, which is used commonly in the interframe coders.read more
Citations
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Journal ArticleDOI
Determining optical flow
TL;DR: In this paper, a method for finding the optical flow pattern is presented which assumes that the apparent velocity of the brightness pattern varies smoothly almost everywhere in the image, and an iterative implementation is shown which successfully computes the Optical Flow for a number of synthetic image sequences.
Book
Computer Vision: Algorithms and Applications
TL;DR: Computer Vision: Algorithms and Applications explores the variety of techniques commonly used to analyze and interpret images and takes a scientific approach to basic vision problems, formulating physical models of the imaging process before inverting them to produce descriptions of a scene.
Journal ArticleDOI
Displacement Measurement and Its Application in Interframe Image Coding
TL;DR: The motion compensation is applied for analysis and design of a hybrid coding scheme and the results show a factor of two gain at low bit rates.
Journal ArticleDOI
The computation of optical flow
TL;DR: The computation of optical flow is investigated in this survey: widely known methods for estimating optical flow are classified and examined by scrutinizing the hypothesis and assumptions they use.
Journal ArticleDOI
Image coding using vector quantization: a review
Nasser M. Nasrabadi,R.A. King +1 more
TL;DR: First, the concept of vector quantization is introduced, then its application to digital images is explained, and the emphasis is on the usefulness of the vector quantification when it is combined with conventional image coding techniques, orWhen it is used in different domains.
References
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Journal ArticleDOI
Adaptive noise cancelling: Principles and applications
Bernard Widrow,J.R. Glover,John M. McCool,J. Kaunitz,C.S. Williams,R.H. Hearn,James R. Zeidler,Jr. Eugene Dong,R.C. Goodlin +8 more
TL;DR: It is shown that in treating periodic interference the adaptive noise canceller acts as a notch filter with narrow bandwidth, infinite null, and the capability of tracking the exact frequency of the interference; in this case the canceller behaves as a linear, time-invariant system, with the adaptive filter converging on a dynamic rather than a static solution.
Journal ArticleDOI
Analysis of recursive stochastic algorithms
TL;DR: It is shown how a deterministic differential equation can be associated with the algorithm and examples of applications of the results to problems in identification and adaptive control.
Journal ArticleDOI
Methods for measuring small displacements of television images
C. Cafforio,Fabio Rocca +1 more
TL;DR: A segmentation algorithm is proposed which uses dynamic programming (Viterbi algorithm with three states) and a simpler method that makes possible the estimation of the n most probable displacements is proposed.
Journal ArticleDOI
Estimating the Velocity of Moving Images in Television Signals
J.O. Limb,J.A. Murphy +1 more
TL;DR: In this paper, the horizontal component of velocity is estimated by subtracting the contents of one accumulator from the other and dividing the result by the sum of the magnitude of the element-difference signal in the moving area.
Journal ArticleDOI
A video encoding system with conditional picture-element replenishment
TL;DR: An experimental method for encoding television signals which takes advantage of the frame-to-frame correlation to reduce transmission bit rate is described, demonstrated in real-time using the head-and-shoulder view of a person in animated conversation as the picture source.