Abstract

Following O’Neill the spatial frequency filtering of granularity has been performed by using a low-pass filter. The sample is illuminated in coherent and parallel light. Qualitative and quantitative results are shown in a few examples and the effect of spatial frequency filtering on contrast, sharpness, resolving power, and granularity is pointed out. The spatial filtering of granularity appears as a powerful tool to increase the signal-to-noise ratio in the frequency band transmitted.

© 1964 Optical Society of America

Methods for Engineering Photographic Systems

George C. Higgins
Appl. Opt. 3(1) 1-10 (1964)

Aspects of Photographic Systems Engineering

S. A. Hempenius
Appl. Opt. 3(1) 45-53 (1964)

Analysis of Fine-Detail Reproduction in Photographic Systems

J. L. Simonds, J. R. Kelch, and G. C. Higgins
Appl. Opt. 3(1) 23-28 (1964)

Field Photometer with Nine-Element Filter Wheel

Z. Frentress, L. C. Young, and H. D. Edwards
Appl. Opt. 3(2) 303-308 (1964)

Interference Filter Spectrometer for Low-Intensity Extended Sources

J. G. Carter, R. A. MacRae, D. R. Nelson, R. D. Birkhoff, and E. T. Arakawa
Appl. Opt. 3(1) 75-78 (1964)