Patent ID: 11861897
Assignee: JIANGSU UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 12:
13. The detection method according to claim 12, wherein a specific process of the image modulation comprises:
demodulating the diffuse reflection image by using a formula, M
     
      A
      ⁢
      C
     
    
    (
    
     x
     ,
     
      f
      x
     
    
    )
   
   =
   
    
     
      2
     
     3
    
    [
    
     
      
       (
       
        
         I
         1
        
        -
        
         I
         2
        
       
       )
      
      2
     
     +
     
      
       (
       
        
         I
         2
        
        -
        
         I
         3
        
       
       )
      
      2
     
     +
     
      
       (
       
        
         I
         3
        
        -
        
         I
         1
        
       
       )
      
      2
     
    
    ]
   
  
  ,
 

 to obtain a diffuse reflection amplitude envelope curve of the crop sample to be detected; and
then calculating the alternating current component of the image by using the formula IAC(x,fx)=MAC(x,fx)·cos(2πfx+α);
wherein I1, I2, and I3 respectively reflection intensities of pixels of the diffuse reflection image of the crop sample to be detected in the three phases, fx is a spatial frequency of a light source, and a is a spatial phase of the light source.