Search Results - "Rovamo, J"

The Effect of Contrast and Size Scaling on Face Perception in Foveal and Extrafoveal Vision by Melmoth, Dean R, Kukkonen, Helja T, Makela, Pia K, Rovamo, Jyrki M

“…To determine whether face perception can be equalized across the visual field by scaling size and contrast simultaneously. Contrast sensitivities were measured…”
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Modelling spatial contrast sensitivity functions for chromatic and luminance-modulated gratings by Rovamo, Jyrki M., Kankaanpää, Mia I., Kukkonen, Heljä

“…We extended our detection model of achromatic spatial vision (Rovamo, J., Mustonen, J., & Näsänen, R. (1994a). Modelling contrast sensitivity as a function of…”
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An estimation and application of the human cortical magnification factor by Rovamo, J, Virsu, V

“…Comparisons of the published data on the density D of receptive fields of retinal ganglion cells and on the cortical magnification factor M indicated that M2…”
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Visual resolution, contrast sensitivity, and the cortical magnification factor by Virsu, V, Rovamo, J

“…This study shows that photopic contrast sensitivity and resolution can be predicted by means of simple functions derived by using the cortical magnification…”
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A window model for spatial integration in human pattern discrimination by Nasanen, RE, Kukkonen, HT, Rovamo, JM

“…A simple model of human visual pattern discrimination was designed and tested experimentally. The model is based on two assumptions. First, at any glimpse the…”
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Masking potency and whiteness of noise at various noise check sizes by Kukkonen, H, Rovamo, J, Nasanen, R

“…The masking effect of spatial noise can be increased by increasing either the rms contrast or check size of noise. In this study, the authors investigated the…”
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Modeling spatial integration and contrast invariance in visual pattern discrimination by Nasanen, RE, Kukkonen, HT, Rovamo, JM

“…Human pattern discrimination performance has been reported to be largely independent of stimulus contrast but to depend on stimulus area. The authors propose a…”
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Spatial neural modulation transfer function of human foveal visual system for equiluminous chromatic gratings by Rovamo, Jyrki M., Kankaanpää, Mia I., Hallikainen, Jarmo

“…To determine the spatial modulation transfer function (MTF) of the human foveal visual system for equiluminous chromatic gratings we measured contrast…”
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Resolution of gratings oriented along and across meridians in peripheral vision by Rovamo, J, Virsu, V, Laurinen, P, Hyvarinen, L

“…Grating resolution was measured at various locations of the visual field for four grating orientations. As an instance of the oblique effect, vertical and…”
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Detection efficiency of circular gratings and bandpass filtered points with randomized phase spectra by Kukkonen, H, Nasanen, R, Rovamo, J

“…In the studies of spatial integration an increase in the spatial extent of the stimulus usually results in a decrease in the spatial frequency bandwidth of the…”
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Analysis of spatial structure in eccentric vision by SAARINEN, J, ROVAMO, J, VIRSU, V

“…The analysis of spatial structure, ie, the encoding of relative positions between pattern elements, was studied in central and eccentric vision. In a…”
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Spatial integration of compound gratings with various numbers of orientation components by Rovamo, J, Ukkonen, O, Thompson, C, Nasanen, R

“…The human foveal visual system in a detection task was recently modeled as a simple image processor comprising low-pass filtering due to the optical modulation…”
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Three-dimensional illusory objects produced by rotation in depth by Kojo, I, Liinasuo, M, Rovamo, J

“…Rotation of a Kanizsa triangle in depth around its vertical axis causes a perception of a three-dimensional object with a flat, rigid illusory triangle between…”
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Scaling Extrafoveal Detection of Distortion in a Face and Grating by Melmoth, Dean R, Kukkonen, Heljä T, Mäkelä, Pia K, Rovamo, Jyrki M

“…Peripheral performance involving simple visual tasks and stimuli can be equated with foveal performance by spatial scaling, whilst more complex tasks and…”
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Scaling of both gratings size and contrast is necessary for equalising detection across eccentricities by Rovamo, J. M., Melmoth, D. R.

“…Abstract only…”
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Receptive field density of retinal ganglion cells and cortical magnification factor in man by Rovamo, J

“…A mathematical relationship is derived between the density or retinal ganglion cell receptive fields and cortical magnification factor. The derivation is based…”
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Identification of facial images in peripheral vision by Mäkelä, Pia, Näsänen, Risto, Rovamo, Jyrki, Melmoth, Dean

“…Contrast sensitivity for face identification was measured as a function of image size to find out whether foveal and peripheral performance would become…”
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Temporal integration and contrast sensitivity in foveal and peripheral vision by Rovamo, J, Leinonen, L, Laurinen, P, Virsu, V

“…Spatial contrast sensitivity functions and temporal integration functions for gratings with dark surrounds were measured at various eccentricities in photopic…”
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Perceived spatial frequency of flickering gratings: a local spatial distortion by Nyman, G, Rovamo, J

“…Perceived spatial frequency of a low-frequency grating increases if the grating contrast is temporally modulated at about 4 to 16 Hz. The amount of increase…”
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Modelling the dependence of contrast sensitivity on grating area and spatial frequency by Rovamo, J, Luntinen, O, Näsänen, R

“…We modelled the human foveal visual system in a detection task as a simple image processor comprising (i) low-pass filtering due to the optical transfer…”
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