Abstract

The type of blur involved in an optical image can be specified by describing the distribution of illuminance across the image of a narrow line. This is called the blur function. If the blur function conforms to the normal curve, the image of a grating will gradually fuse as the spacing decreases without undergoing “spurious resolution.” This property of a Gaussian blur function makes it possible to use it in analyzing the effects obtained with other types of blur. This approach to the problem also explains why there is a poor correlation between the resolution of gratings and the Cobb-Fry index of blur.

© 1961 Optical Society of America

Foveal Contrast Thresholds with Blurring of the Retinal Image and Increasing Size of Test Stimulus*

Kenneth N. Ogle
J. Opt. Soc. Am. 51(8) 862-869 (1961)

Peripheral Contrast Thresholds and Blurring of the Retinal Image for a Point Light Source*

Kenneth N. Ogle
J. Opt. Soc. Am. 51(11) 1265-1268 (1961)

Imaging of Extended Polychromatic Sources and Generalized Transfer Functions

George B. Parrent
J. Opt. Soc. Am. 51(2) 143-151 (1961)

Relation Between Surface Roughness and Specular Reflectance at Normal Incidence

H. E. Bennett and J. O. Porteus
J. Opt. Soc. Am. 51(2) 123-129 (1961)

Photoconductive Time Constants and Related Characteristics of p-Type Gold-Doped Germanium

T. P. Vogl, J. R. Hansen, and M. Garbuny
J. Opt. Soc. Am. 51(1) 70-75 (1961)