REFERENCES 
Rosenfeld, A., and Kak, A.C., 1981. Digital Pic- 
ture Processing. 2nd ed., Academic Press, N.Y. 
Shi Zhongshu, 1988. Knowledge Engineering. Tsing- 
hua University Press, Beijing, China. 
  
(a) Scene image before enhancement 
  
(c) Middle result 
The original input image was divided 
and each 
into 25 block subimages, 
subimage was enhanced with the rule- 
based localized scheme. 
Shu Shoupyng,1986. ISES. An Image Segmentation 
Expert System for Aerial Photographs Based on 
the Use of Edge and Texture Features. Ph. D. 
thesis, Rensselear Polytechnic Institute, Troy, New 
York. 
  
(b) After histogram equalization 
enhancenment 
  
(d) Final output image 
It was acquired by eliminating the 
border effects between block subimages 
from Fig.6 (c), based on a Gaussian 
image overlay recombination scheme. 
Fig.6 A part of experimental results. 
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