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.)

Magnetic tapes, Optical disk drives, Data storage media, Magnetic Disks, Storage Media, Coding, Channels, Optical Disk Drive, Digital Audio Tape, DAT (Digital audiotape), Run-Length Encoding, Point-to-Point Connection, Run length encoding

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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.

Algorithms, Image processing, Algorithm, Comparison, Optical Memory, Image Motion, Scene Analysis, Feature Measurement

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