Abstract

In order to determine the relation between the visual impression of graininess and the objectively determined granularity of a wide range of granularity types, a series of samples was prepared containing uniformly exposed black-and-white materials and prints (transparencies) containing varying degrees of mottle. These samples were judged by the method of paired comparisons at different magnifications and scanned to obtain the standard deviation σ(D) for a wide range of scanning apertures. The psychophysical relationship between the two functions, (1) graininess versus magnification and (2) granularity σ(D) versus the square root of the scanning area, depends on the character of the scanning operation performed by the eye. An estimate of the size of the effective scanning spot of the eye can be obtained from these data.

© 1959 Optical Society of America

Autocorrelation and Granularity. Part II. Results on Flashed Black-and-White Emulsions*

Hans J. Zweig
J. Opt. Soc. Am. 46(10) 812-820 (1956)

Experimental Study of rms Granularity as a Function of Scanning-Spot Size*

George C. Higgins and Keith F. Stultz
J. Opt. Soc. Am. 49(9) 925-929 (1959)

The Relationship Between the Granularity and Graininess of Developed Photographic Materials*

Loyd A. Jones and George C. Higgins
J. Opt. Soc. Am. 35(7) 435-457 (1945)

Photographic Granularity and Graininess*III. Some Characteristics of the Visual System of Importance in the Evaluation of Graininess and Granularity

Loyd A. Jones and George C. Higgins
J. Opt. Soc. Am. 37(4) 217-263 (1947)

Autocorrelation and Granularity. III. Spatial Frequency Response of the Scanning System and Granularity Correlation Effects Beyond the Aperture*

Hans J. Zweig
J. Opt. Soc. Am. 49(3) 238-244 (1959)