Patent
Adaptive digital video compression system
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TLDR
In this article, a full motion color digital video signal is compressed, formatted for transmission, recorded on compact disc media and decoded at conventional video frame rates, where regions of a frame are individually analyzed to select optimum fill coding methods specific to each region.Abstract:
A full motion color digital video signal is compressed, formatted for transmission, recorded on compact disc media and decoded at conventional video frame rates. During compression, regions of a frame are individually analyzed to select optimum fill coding methods specific to each region. Region decoding time estimates are made to optimize compression thresholds. Region descriptive codes conveying the size and locations of the regions are grouped together in a first segment of a data stream. Region fill codes conveying pixel amplitude indications for the regions are grouped together according to fill code type and placed in other segments of the data stream. The data stream segments are individually variable length coded according to their respective statistical distributions and formatted to form data frames. The number of bytes per frame is dithered by the addition of auxiliary data determined by a reverse frame sequence analysis to provide an average number selected to minimize pauses of the compact disc during playback thereby avoiding unpredictable seek mode latency periods characteristic of compact discs. A decoder includes a variable length decoder responsive to statistical information in the code stream for separately variable length decoding individual segments of the data stream. Region location data is derived from region descriptive data and applied with region fill codes to a plurality of region specific decoders selected by detection of the fill code type (e.g., relative, absolute, dyad and DPCM) and decoded region pixels are stored in a bit map for subsequent display.read more
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References
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Journal ArticleDOI
Picture coding: A review
Arun N. Netravali,J.O. Limb +1 more
TL;DR: This paper presents a review of techniques used for digital encoding of picture material, covering statistical models of picture signals and elements of psychophysics relevant to picture coding, followed by a description of the coding techniques.
Patent
Video bandwidth reduction system employing interframe block differencing and transform domain coding
TL;DR: In this article, video type information signals are compressed for transmission and reproduction by comparing corresponding blocks of time domain information signals from successive fields, converting a block of the information signals to a transform domain signal represented by discrete cosine transform coefficients when the difference between the corresponding blocks exceeds a block difference threshold, and encoding the transform domain coefficients for transmission to a decoding site.
Patent
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TL;DR: In this paper, a gray-scale image is progressively transmitted over a narrow-band channel after the grayscale values of all picture elements (pixels) have been formatted into a hierarchical structure of picture subdivisions of successive sizes from entire image down to basic element values.
Patent
Method and apparatus for providing motion estimation signals for communicating image sequences
TL;DR: In this paper, an adaptive approach is used where the step size parameter is incremented in accordance with a gradient error used in the steepest descent technique, and the iteration process is terminated when an iteration error measure is less than a predetermined threshold value.
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Picture signal coding apparatus
TL;DR: In this paper, a frame of a gray-scaled picture is divided into blocks, in each of which the mean luminance of picture elements is used as a threshold value for comparison with each picture element signal to classify it into 0 or 1 according to its magnitude to provide a resolution component.