Patent ID: 11906616
Assignee: XIDIAN UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G  Y | IPC G

Claim 6:
7. The method according to claim 1, wherein, in (7b3), 8 features are extracted from the difference matrix, including the number of energy generation change points M, the total energy of the difference matrix SDE, the mean value of energy change at each point DEA, the difference matrix variance DV, the standard deviation of the difference matrix DS, the entropy of the difference matrix DE, the range dimension extension of the difference matrix ΔW and the velocity dimension extension of the difference matrix ΔD, expressed by the following formula:, M
   =
   
    
     ∑
     
      i
      =
      1
     
     G
    
    
     q
     i
    
   
  
  ⁢
  

  
   SDE
   =
   
    
     ∑
     
      i
      =
      1
     
     M
    
    
     delta_energy
     i
    
   
  
  ⁢
  

  
   DEA
   =
   
    SDE
    /
    M
   
  
  ⁢
  

  
   
    D
    ⁢
    V
   
   =
   
    
     ∑
     
      i
      =
      1
     
     M
    
    
     
      
       [
       
        
         delta_energy
         i
        
        -
        
         SDE
         /
         M
        
       
       ]
      
      2
     
     /
     M
    
   
  
  ⁢
  

  
   DS
   =
   
    sqrt
    ⁢
    
     {
     
      
       ∑
       
        i
        =
        1
       
       M
      
      
       
        
         [
         
          
           delta_energy
           i
          
          -
          
           SDE
           /
           M
          
         
         ]
        
        2
       
       /
       M
      
     
     }
    
   
  
  ⁢
  

  
   
    D
    ⁢
    E
   
   =
   
    -
    
     
      ∑
      
       i
       =
       1
      
      M
     
     
      
       p
       i
      
      ⁢
      ln
      ⁢
      
       p
       i
      
     
    
   
  
  ⁢
  

  
   
    Δ
    ⁢
    W
   
   =
   
    y_top
    -
    y_down
    +
    1
   
  
  ⁢
  

  
   
    Δ
    ⁢
    D
   
   =
   
    x_right
    -
    x_left
    +
    1, Where,, q
   i
  
  =
  
   {
   
    
     
      
       1
      
      
       
        
         if
         ⁢
            
         
          delta_rdenergy
          i
         
        
        ≠
        0
       
      
     
     
      
       0
      
      
       
        
         if
         ⁢
            
         
          delta_rdenergy
          i
         
        
        =
        0
       
      
     
    
    ,, delta_rdenergyi is the energy value of the ith pixel of the difference matrix, delta_energyi is the energy value of the ith non-zero pixel of the difference matrix, G is the total number of pixel points in the difference matrix; pi=delta_energyi/SDE, y_top, and y_down are vertical coordinates corresponding to the uppermost and lowermost non-zero pixels of the difference matrix respectively, x_right and x_left are the vertical coordinates corresponding to the rightmost and leftmost non-zero pixels of the difference matrix, respectively, and sqrt(⋅) represents extracting the square root of the elements in brackets, and ln(⋅) represents solving the natural logarithm for the elements in brackets.