Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1997-07-25
1999-09-28
Pham, Hoa Q.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
G01M 1100
Patent
active
059597267
ABSTRACT:
Improving accuracy of frequency response measurements of linear systems using modulation transfer function test compensation. An optical imaging system illuminates and images an input test pattern. A processor measures a modulation transfer function. The processor determines a compensating factor for error in the input test pattern duty cycle. The driving function for the measurement is a test pattern having a periodic waveform approximating a square wave with an error in duty cycle. A windowed fast fourier transform on a greyscale image of the test pattern generates odd harmonics. Adjusting amplitude values of the odd harmonics corrects for the error in resolution target duty cycle.
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Biggs Wayne A.
Cheng Yuhui
Ortyn William E.
Phan Tuan H.
Riley James K.
Moffa Emil
NeoPath, Inc.
Pham Hoa Q.
Sun Hans I.
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