[2] BLESSING P , VON ORELLI A , NIEDERER P . Passive auto-focus for digital endoscopic imaging system [J]. SPIE ,1999, 3595 : 148-155.
[4] SUBBARAO Murali , CHOI Tae-sun , NIKZAD Arman. Focusing techniques [J]. SPIE, 1992, 1823 : 163-174.
[2] BLESSING P , VON ORELLI A , NIEDERER P . Passive auto-focus for digital endoscopic imaging system [J]. SPIE ,1999, 3595 : 148-155.
[4] SUBBARAO Murali , CHOI Tae-sun , NIKZAD Arman. Focusing techniques [J]. SPIE, 1992, 1823 : 163-174.
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