Patent ID: 11906286
Assignee: NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 2:
3. According to claim 2, a deep learning-based temporal phase unwrapping method for fringe projection profilometry is characterized by step two wherein the wrapped phase φ(x, y) is obtained as:, φ
    ⁡
    
      (
      
        x
        ,
        y
      
      )
    
  
  =
  
    arctan
    ⁢
    
      
        
          3
        
        ⁢
        
          (
          
            
              
                I
                1
              
              ⁡
              
                (
                
                  x
                  ,
                  y
                
                )
              
            
            -
            
              
                I
                3
              
              ⁡
              
                (
                
                  x
                  ,
                  y
                
                )
              
            
          
          )
        
      
      
        
          2
          ⁢
          
            
              I
              2
            
            ⁡
            
              (
              
                x
                ,
                y
              
              )
            
          
        
        -
        
          
            I
            1
          
          ⁡
          
            (
            
              x
              ,
              y
            
            )
          
        
        -
        
          
            I
            3
          
          ⁡
          
            (
            
              x
              ,
              y
            
            ), due to the truncation effect of the arctangent function, the obtained wrapped phase φ(x, y) is wrapped within a range of [0, 2π], and its relationship with Φ(x, y) is:

Φ(x, y)=φ(x, y)+2πk(x, y), where k(x, y) represents a fringe order of Φ(x, y), and its value range is from 0 to N−1; N is a period number of the fringe patterns.