scholarly journals Resolution Enhancement; the ‘Maximum Entropy Method’ and the ‘High Resolution Method’

1979 ◽  
Vol 49 ◽  
pp. 197-218
Author(s):  
C. van Schooneveld
Keyword(s):  
High Resolution ◽  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Resolution Enhancement ◽  
Image Formation ◽  
Entropy Method ◽  
Resolution Method ◽  
High Resolution Method

In image formation from coherence functions we start with a set of observed coherences (visibilities) R′ (uk, vk), measured at locations uk, vk in the u,v-plane:

scholarly journals High resolution infrared maps of IRAS galaxies

1991 ◽  
Vol 147 ◽  
pp. 411-412
Author(s):  
S. K. Ghosh ◽  
T. N. Rengarajan ◽  
R. P. Verma
Keyword(s):  
High Resolution ◽  
Spatial Structure ◽  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Entropy Method ◽  
The Cross

IRAS has provided infrared maps of a large number of galaxies. However the size of IRAS survey detectors is quite large (∼5′ in the cross-scan direction) and there is a need for improving the resolution of these maps. In order to understand the spatial structure of galaxies, we have generated high resolution maps of 18 large galaxies by deconvolving the IRAS pointed observations from survey detectors as well as from Chopped Photometric Channel (CPC) using Maximum Entropy Method (MEM).

Nonlinearity of the maximum entropy method in resolution enhancement

1992 ◽  
Vol 70 (12) ◽  
pp. 2887-2894 ◽  
Author(s):  
J. K. Kauppinen ◽  
D. J. Moffatt ◽  
H. H. Mantsch
Keyword(s):  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Linear Prediction ◽  
Signal To Noise Ratio ◽  
Resolution Enhancement ◽  
Nonlinear Behavior ◽  
Entropy Method ◽  
Spectral Lines ◽  
High Signal ◽  
Intensity Pattern

The nonlinear behavior of the filter-type Maximum Entropy Method (MEM) was investigated from a theoretical and a practical point of view. The integrated intensity of the output spectral lines of MEM was probed as a function of the input intensity pattern, the filter length, and the S/N ratio of the input spectrum. The nonlinear behavior of MEM has been explained and the results compared with those derived by another method, LOMEP (Lineshape Optimized Maximum Entropy linear Prediction). The study was carried out with the aim of resolution enhancement of spectra that have high signal-to-noise ratio.

scholarly journals High resolution infrared maps of IRAS galaxies

1991 ◽  
Vol 147 ◽  
pp. 411-412
Author(s):  
S. K. Ghosh ◽  
T. N. Rengarajan ◽  
R. P. Verma
Keyword(s):  
High Resolution ◽  
Spatial Structure ◽  
Maximum Entropy ◽  
Maximum Entropy Method ◽  
Entropy Method ◽  
The Cross

IRAS has provided infrared maps of a large number of galaxies. However the size of IRAS survey detectors is quite large (∼5′ in the cross-scan direction) and there is a need for improving the resolution of these maps. In order to understand the spatial structure of galaxies, we have generated high resolution maps of 18 large galaxies by deconvolving the IRAS pointed observations from survey detectors as well as from Chopped Photometric Channel (CPC) using Maximum Entropy Method (MEM).

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