0000000000702357

AUTHOR

M. J. Buades

showing 2 related works from this author

Contrast sensitivity of the visual system in speckle imagery

1994

The contrast sensitivity function (CSF) of the whole visual system is determined with the use of coherent diffuse illumination. This function provides supplementary data about the effect of speckle on the ability of the visual system to perceive the spatial information contained in an image. The results show that speckle not only prevents perception of the finest details (highest frequencies) but also reduces the visibility of lower frequencies (especially where contrast is low). The difference between the CSF's determined with and without speckle is quantitatively very important. And the ratio between the two CSF's is a measure of the retinal ability to perceive contrast in the presence of…

MalePhysicsLightgenetic structuresbusiness.industryImage qualitymedia_common.quotation_subjectPupilSpeckle noiseLuminanceAtomic and Molecular Physics and OpticsPupilElectronic Optical and Magnetic MaterialsContrast SensitivitySpeckle patternOpticsHumansContrast (vision)FemaleComputer Vision and Pattern RecognitionSpatial frequencySensitivity (control systems)businessVision Ocularmedia_commonJournal of the Optical Society of America A
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Human contrast sensitivity in coherent Maxwellian view: effect of coherent noise and comparison with speckle.

1997

Lasers have been used in vision for measuring the neural contrast sensitivity function (CSF) by forming interference fringes on the retina. We distinguish among three kinds of illumination with lasers: incoherent (without noise), Maxwellian or coherent (with coherent noise), and diffuse coherent (with speckle). The three have different characteristics and different CSF's. A coherent imaging system is designed to measure the CSF with fully coherent illumination. This is the CSF of the whole visual system, although it is measured with gratings imaged on the retina. It therefore differs from the neural CSF's measured by other authors with partially coherent illumination. However, the neural CS…

PhysicsMasking (art)business.industrymedia_common.quotation_subjectSpeckle noiseRefraction OcularLuminanceAtomic and Molecular Physics and OpticsRetinaElectronic Optical and Magnetic MaterialsContrast SensitivitySpeckle patternNoiseOpticsImage Processing Computer-AssistedContrast (vision)HumansComputer Vision and Pattern RecognitionSpatial frequencySpeckle imagingbusinessMathematicsmedia_commonJournal of the Optical Society of America. A, Optics, image science, and vision
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