Information Content Of Images Degraded By Speckle Noise
Abstract
After a homomorphic transformation has been used to transform speckle noise into additive signalindependent noise, classic techniques are used to evaluate the number of discernible gray levels and the information capacity of images degraded by fully developed speckle noise. The probability distributions that we developed earlier are used to evaluate the required probabilities of error. Expressions are derived for square and for circular apertures. The information capacity is found to have a maximum of about 0.2 bits per speckle. The spatial frequency resolution required to obtain a given signaltonoise ratio by spatial integration is evaluated.
 Publication:

Optical Engineering
 Pub Date:
 May 1986
 DOI:
 10.1117/12.7973881
 Bibcode:
 1986OptEn..25..662A
 Keywords:

 Degradation;
 Image Processing;
 Information Theory;
 Signal To Noise Ratios;
 Speckle Patterns;
 Apertures;
 Approximation;
 Gray Scale;
 Probability Distribution Functions;
 Radar Imagery;
 Transformations (Mathematics);
 Communications and Radar