DocumentCode
1563828
Title
Hexagonal sub-band coding for images
Author
Mahesh, Balaskrishnan ; Pearlman, William A.
Author_Institution
Dept. of Electr., Comput., & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY, USA
fYear
1989
Firstpage
1953
Abstract
An image coding system is proposed in which hexagonally sampled images are decomposed into subbands that are selective in both frequency and orientation. Nine high-frequency bands each of one octave and 60 degrees of angular orientation are built on a pyramidal structure along with one low-frequency band. Bits are then allocated optimally to the subbands under a mean-squared-error distortion measure. Optimal quantizers are designed for each subband for entropy coding under a Laplacian distribution assumption. An adaptive version of the coding scheme is also implemented, and the results are compared at rates of 0.5 and 1.0 bits per pixel
Keywords
data compression; encoding; picture processing; Laplacian distribution; adaptive coding; entropy coding; hexagonal subband coding; hexagonally sampled images; image coding; mean-squared-error distortion measure; optimal quantisers; pyramidal structure; Distortion measurement; Filtering; Filters; Frequency; Image coding; Image reconstruction; Image sampling; Kernel; Mirrors; Sampling methods;
fLanguage
English
Publisher
ieee
Conference_Titel
Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on
Conference_Location
Glasgow
ISSN
1520-6149
Type
conf
DOI
10.1109/ICASSP.1989.266839
Filename
266839
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