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Coding isotropic imagesRate distortion functions for two-dimensional homogeneous isotropic images are compared with the performance of 5 source encoders designed for such images. Both unweighted and frequency weighted mean square error distortion measures are considered. The coders considered are differential PCM (DPCM) using six previous samples in the prediction, herein called 6 pel (picutre element) DPCM; simple DPCM using single sample prediction; 6 pel DPCM followed by entropy coding; 8 x 8 discrete cosine transform coder, and 4 x 4 Hadamard transform coder. Other transform coders were studied and found to have about the same performance as the two transform coders above. With the mean square error distortion measure DPCM with entropy coding performed best. The relative performance of the coders changes slightly when the distortion measure is frequency weighted mean square error. The performance of all the coders was separated by only about 4 dB.
Document ID
19770041497
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Oneal, J. B., Jr.
(North Carolina State University Raleigh, N.C., United States)
Natarajan, T. R.
(Kansas State University of Agriculture and Applied Science, Manhattan, Kan., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Subject Category
Cybernetics
Meeting Information
Meeting: International Conference on Communications
Location: Philadelphia, PA
Start Date: June 14, 1976
End Date: June 16, 1976
Accession Number
77A24349
Funding Number(s)
CONTRACT_GRANT: NCA2-OR363-501
Distribution Limits
Public
Copyright
Other

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