By Peter G. J. Barten
Examines distinction sensitivity of the human visible system--concerning the eye's skill to differentiate items from one another or from the background--and its results at the image-forming technique. The textual content presents equations for settling on numerous facets of distinction sensitivity, as well as versions (mathematical expressions) that may simply be tailored for functional applications.
- Modulation threshold and noise
- version for the spatial distinction sensitivity of the eye
- Extension of the distinction sensitivity version to extra-foveal vision
- Extension of the distinction sensitivity version to the temporal domain
- influence of nonwhite spatial noise on distinction sensitivity
- distinction discrimination model
- photo caliber measure
- impact of varied parameters on photograph quality
- Curriculum Vitae
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Extra resources for Contrast Sensitivity of the Human Eye and Its Effects on Image Quality
From his measurements an approximately quadratic dependence on field size can be derived. By assuming that Eq. 9) where Xo is the angular field size of the object in degrees. For a rectangular field X0 2 has to be replaced by X0 Y0 , and for a circular field Xo2 has to be replaced by 7t/4 xiJ2 where D is the field diameter in degrees. This expression will generally be used here as a refinement of Eq. 8). lt is in fact only valid for young adult observers. At older ages, the pupil size decreases with age.
Fig. 1 shows a block diagram of the model. For completeness, external noise is also mentioned in this figure. Extemal noise can, for instance, consist of display noise present in a television image, or of grain noise present in a photographic image. The spectral noise density of this external noise adds to the spectral noise density of the internal noise after multiplication by M 0 P12 (u)M1a12 (u). However, in most of the cases treated in this chapter no external noise is present. 3 Optica/MTF photon noise extemal noise image ....
For u0 the mentioned value of 7 cycles/deg is used. The figure further shows measurement data of the total point-spread function given by Blommaert et al. ( 1987). These data were obtained with a sophisticated perturbation technique based on peak. detection of a combination of sub-threshold stimuli. The measurements were made with an artificial normalized response - low pass fitter comb. + opt. MTF + subj. HH x subj. 3: Solid anve: cross-section of the total point-spread function of the eye obtained by a combination of the optical point-spread function of the eye with the annular point-spread function of the low-pass inhibition ftlter given by Eq.