Full text: Reports and invited papers (Part 3)

     
     
      
  
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METHODS OF TESTING 
PRODUCTION TESTING 
OTF IN RESEARCH 
OTF IN LENS DESIGN 
SYSTEM TESTING USING MTF 
WRIGHT-PATTERSON AFB AFAL/RWF EVALUTION OF AERIAL IMAGERY-- 
GLIATTI 
WELCH AND CORBETT EVALUATION OF SPACE IMAGERY 
REPORTS FROM NATIONS 
APPLICATION TO QUALITY CONTROL 
CURRENT STUDIES 
SIGNAL TO NOISE 
PHASE 
COHERANCE 
CASCADING 
INTERFEROMETRIC METHODS 
OTHER APPLICATIONS 
RECOMMENDATIONS AND PROPOSALS 
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4. WORKING GROUP ACTIVITY 
Phase Transfer Function (Brock) 
    
      
   
     
    
    
   
    
   
  
    
  
  
It is always advisable to consider the problems of phase when 
OTF and MTF are being used in either development or quality assurance 
applications. There are papers by Shack and Lamberts explaining 
the significance of phase and a review of the subject is presented 
here by Brock. 
4.1.1 The Significance of the Phase Transfer Function ( o 
4.1.1.1 Description: In the common one-dimensional analysis, the 
Optical Transfer Function (OTF) is the Fourier Transform of the 
line spread function. The mathematical transformation yields two 
parts, the Modulation Transfer Function (MTF) and the Phase Transfer 
Function (PTF). To appreciate the physical significance of these, 
consider that in applying the OTF to the imagery of an object, 
the latter must first be transformed into its hypothetical component 
sinewaves. For example, a squarewave is equivalent to a fundamental 
sinewave at the squarewave frequency, plus the odd harmonics in 
a specific phase relationship. In a perfect image, the squarewave 
would be built up by the sum of frequencies 
4/1 IN + 1/3 (3N) + 1/7 (7N) + etc.---- ] 
where 1/3 etc., represent the relative amplitudes of the harmonics 
and N is the fundamental frequency. The phasing is such that at 
  
	        
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