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A battery of five spatially localized stimuli are proposed for measuring the complete range of visual sensitivity to spatial contrast. These stimuli are a ramp, an edge, a line, a dipole (a pair of adjacent opposite polarity lines), and a quadrupole (a pair of adjacent opposite polarity dipoles). The luminance profiles of the multipoles and the relationship of multipole sensitivity to grating sensitivity are shown in Figure 1 (mathematical details are at the end of this article).
© 1987 Optical Society of America
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