Runlength-limited sequences
Article Abstract:
Coding techniques are used in communication systems to increase the efficiency of the channel. Not only is coding equipment being used in point-to-point communication channels, but coding methods are also used in digital recording devices such as sophisticated computer disk files and numerous domestic electronics such as stationary- and rotary-head digital audio tape recorders, the Compact Disc, and floppy disk drives. Since the early 1970s, coding methods based on runlength-limited sequences have played a key role for increasing the storage capacity of magnetic and optical disks or tapes. A detailed description is furnished of the limiting properties of runlength-limited sequences, and a comprehensive review is given of the practical aspects involved in the translation of arbitrary data into runlength-limited sequences. (Reprinted by permission of the publisher.)
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1990
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On the computation of motion from sequences of images - a review
Article Abstract:
Two major approaches have been developed for the computation of motion from sequences of images, feature-based and optical-flow approaches. Such techniques for the sensing, analysis and description of motion from images have found use in a wide range of applications. The feature-based approach extracts highly specific two-dimensional features, such as lines, points or curves, corresponding to rigid three-dimensional object features from each image and establish inter-frame serial correspondence between these features. The optical-flow approach involves computing the two-dimensional field of instantaneous velocities of gray levels in the image plane and combines this data with other constraints or scene data to compute the movement of three-dimensional objects. The two techniques are evaluated and compared for their advantages and disadvantages.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1988
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