0000000000412013

AUTHOR

P. Andres

showing 2 related works from this author

Continuously Variable Periodic Test Target

1987

CONTINUOUSLY VARIABLE PERIODIC TEST TARGETP. ANDRES*, J. OJEDA- CASTANEDAt, and J.C. BARREIRO*tINAOE, Apartado Postal 216, 72000 Puebla, Pue., Mexico*Departamento de Optica, Universidad de Valencia, 46100 Burjasot, Spain1. INTRODUCTIONThe modulus of the optical transfer function (MTF) of the eye or any other optical system is usuallyevaluated by imaging either several gratings each with different spatial frequency, or a single test tar-get having patterns with different frequencies (USAF resolution chart). In any of these two usual proce-dures, the measurement of the MTF is made at discrete values of the spatial frequency.Here we describe a method based on the self -imaging phenomenon for p…

PhysicsOptical axisOpticsbusiness.industryOptical transfer functionTalbot effectImage processingSpatial frequencyMonochromatic colorGratingbusinessImage resolutionSPIE Proceedings
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Lau Effect And Binary Logic

1989

The Lau effect is applied to implement the whole set of binary logic operations optically. Our technique works with spatially incoherent light and does not require lenses or any other optical accessory.

business.industryComputer Science::Information RetrievalComputer programmingPhysics::OpticsOptical computingMoiré patternSet (abstract data type)Superposition principleModulationBinary dataOptical filterbusinessAlgorithmMathematicsSPIE Proceedings
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