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Sub-band/transform compression of video sequencesThe progress on compression of video sequences is discussed. The overall goal of the research was the development of data compression algorithms for high-definition television (HDTV) sequences, but most of our research is general enough to be applicable to much more general problems. We have concentrated on coding algorithms based on both sub-band and transform approaches. Two very fundamental issues arise in designing a sub-band coder. First, the form of the signal decomposition must be chosen to yield band-pass images with characteristics favorable to efficient coding. A second basic consideration, whether coding is to be done in two or three dimensions, is the form of the coders to be applied to each sub-band. Computational simplicity is of essence. We review the first portion of the year, during which we improved and extended some of the previous grant period's results. The pyramid nonrectangular sub-band coder limited to intra-frame application is discussed. Perhaps the most critical component of the sub-band structure is the design of bandsplitting filters. We apply very simple recursive filters, which operate at alternating levels on rectangularly sampled, and quincunx sampled images. We will also cover the techniques we have studied for the coding of the resulting bandpass signals. We discuss adaptive three-dimensional coding which takes advantage of the detection algorithm developed last year. To this point, all the work on this project has been done without the benefit of motion compensation (MC). Motion compensation is included in many proposed codecs, but adds significant computational burden and hardware expense. We have sought to find a lower-cost alternative featuring a simple adaptation to motion in the form of the codec. In sequences of high spatial detail and zooming or panning, it appears that MC will likely be necessary for the proposed quality and bit rates.
Document ID
19920007921
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Sauer, Ken (Notre Dame Univ. IN, United States)
Bauer, Peter (Notre Dame Univ. IN, United States)
Date Acquired
September 6, 2013
Publication Date
January 10, 1992
Subject Category
Communications And Radar
Report/Patent Number
NAS 1.26:189786
NASA-CR-189786
Accession Number
92N17139
Funding Number(s)
CONTRACT_GRANT: NAG3-1186
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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