Abstract

The effect of noise on the modulation transfer function was studied by means of threshold measurements. White noise and 1/f noise of various levels and different cutoff frequencies were displayed on a television screen together with a sinusoidally modulated bar pattern. The signal-to-noise threshold necessary for perception was measured as a function of the spatial frequency of the bar pattern. This signal-to-noise threshold, in addition to being strongly dependent on the bar-pattern frequency is also dependent on the rms value and the frequency distribution of the noise as well as the difference between the bar-pattern frequency and medium frequency of the noise. An attempt was made to explain the results by visual observation of the bar pattern in the presence of narrow-bandwidth noise.

© 1970 Optical Society of America

Visual Masking by Low-Frequency Sinusoidally Modulated Light

G. M. SHICKMAN
J. Opt. Soc. Am. 60(1) 107-117 (1970)

Adaptation to Pattern Spatial Frequency: Effects on Visual Movement Sensitivity in Humans*†

Allan Pantle
J. Opt. Soc. Am. 60(8) 1120-1124 (1970)

Method of Measuring the Modulation Transfer Function of an Apodized Circular Aperture

K. Singh and K. N. Chopra
J. Opt. Soc. Am. 60(5) 641-645 (1970)

Wavelength Discrimination Measured with Square-Wave Gratings*

R. Hilz and C. R. Cavonius
J. Opt. Soc. Am. 60(2) 273-277 (1970)

Effects of Sharp Edges on the Visibility of Sinusoidal Gratings

D. H. KELLY
J. Opt. Soc. Am. 60(1) 98-102 (1970)