Journal ArticleDOI
Sine-wave response of the visual system. I. The Mach phenomenon.
E. M. Lowry,J. J. DePalma +1 more
TLDR
A visual slit photometer has been built with which the subjective intensity distribution may be evaluated directly and the objective and subjective intensity distributions have been combined to yield the sine-wave response of the visual system.Abstract:
In order to develop a complete specification for the appraisal of the quality of a photographic system by the use of sine-wave response functions, the sine-wave response of the complete visual system must also be known. A method has been worked out for determining the above-mentioned response of the eye. Whenever the eye views a diffuse luminous boundary in which a sudden change of luminance gradient occurs, a bright line appears at the junction of the gradient and the higher luminance, and a dark line at the junction of the gradient and the lower luminance. This phenomenon is a purely subjective one, because physical measurements of the luminances involved show no luminance higher or lower than the two between which the gradient exists.A visual slit photometer has been built with which the subjective intensity distribution may be evaluated directly. By application of Fourier analysis, the objective and subjective intensity distributions have been combined to yield the sine-wave response of the visual system.read more
Citations
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Journal ArticleDOI
Contrast constancy: deblurring in human vision by spatial frequency channels.
Mark A. Georgeson,G.D. Sullivan +1 more
TL;DR: It is argued that spatial frequency channels in the visual cortex are organized to compensate for earlier attenuation, and achieves a dramatic 'deblurring' of the image, and optimizes the clarity of vision.
Journal ArticleDOI
Infant pattern vision: a new approach based on the contrast sensitivity function.
Martin S. Banks,Philip Salapatek +1 more
TL;DR: An alternative approach based on measurements of the contrast sensitivity function (CSF) is proposed and a simple model of infant pattern preference is proposed that accurately predicts the results of a number of well-known experiments.
Journal ArticleDOI
Effect of Exposure Duration on Visual Contrast Sensitivity with Square-Wave Gratings*†
TL;DR: Contrast sensitivity for square-wave gratings of spatial frequencies between 0.44 and 33.2 cycles/deg was determined for exposure durations between 11 and 500 msec as mentioned in this paper.
Journal ArticleDOI
Spatial sine-wave responses of the human visual system.
TL;DR: The liminal contrast sensitivity measured as a function of the exposure duration of the stimulus and as afunction of the velocity of the horizontally moving vertical sine-wave gratings showed some temporal characteristics in the spatial response.
Journal ArticleDOI
Spatial Resolution by the Human Visual System. The Effect of Mean Retinal Illuminance
TL;DR: Experimental results showing the effect of mean retinal illuminance on the modulation transfer function (MTF) of the human visual system are reported, which provides an upper bound for the behavior of visual acuity at any retinal Illuminance.
References
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Optical and photoelectric analog of the eye.
TL;DR: A photoelectric analog of the visual system is constructed in conformance with anatomical data, in the form of a color television camera chain feeding electrical signals to a “computer” (the brain).
Journal ArticleDOI
On the Assessment of Optical Images
Peter Fellgett,E. H. Linfoot +1 more
TL;DR: In this article, the authors considered the problem of image fidelity in terms of the transmission factors of the optical system and the information content of the image in Shannon's sense, and proposed a criterion for image fidelity based on the statistical properties of the assumed object set and of the unpredictable fluctuations which necessarily disturb observation.
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Measurement of Contrast Transmission Characteristics in Optical Image Formation
TL;DR: In this article, a method of testing the performance of lenses is worked out, based upon the fact that the light distribution in the image of any one-dimensional test pattern can be determined from the light distortion.
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Measurement of Sine-Wave Response of a Photographic Emulsion*
TL;DR: In this paper, a method for experimentally determining the sine-wave response of a photographic emulsion is described, which is defined in terms of relative exposure in the emulsion, it should be substantially independent of development conditions and the exposure level when adjacency effects are absent.
Journal ArticleDOI
Direct measures of the retinal image.
TL;DR: Direct measurement of acuity target images as formed by excised steer and cat eyes indicates the blur of the retinal image to be much greater than theoretically expected.