Human visual system detection

The key featme of Daly s visible-difference predictor is a model of the human visual system that concentrates on the lower-order processing of the system such as optics, retina, lateral geniculate nucleus and some higher-order processing in striate cortex. The model contains three main components (i) an amplitude nonlinearity (in image-processing terms, a point process), (ii) the contrast sensitivity functions (implemented as a filter process), and (iii) a detection process which models masking processes within the visual system. 

The goal of mammography is to detect and diagnose breast cancer, a task which is generally performed by experienced and skilled radiologists. For optimal reader performance, mammograms have to be matched to the human visual system when they are... 

With a large number of receptive channels, the human visual system processes information in a parallel fashion. A single glimpse acquires a wealth of information the field of view for two eyes is 180° horizontally and 120° vertically (Mehr and Shindell, 1990). The spatial resolution in the central (foveal) part of the visual field is approximately 0.5-1.0 min of arc (Shlaer, 1937), although Vernier acuity, the specialized task of detecting a misalignment of two lines placed end to end, is much finer, approximately 2 s of arc (Stigmar, 1970). Low-contrast presentations substantially reduce visual acuity. 

Under ideal conditions, the human visual system can detect ... 

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