Accepted papers to appear in an upcoming issue
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Introducing the concept of anisotropy at different scales for modeling optical turbulence
- received 03/25/2014; accepted 06/19/2014; posted 07/02/2014; Doc. ID 208610
- [full text: PDF (779) KB)]
- Abstract: In this paper, the concept of anisotropy at different atmospheric turbulence scales is introduced. Also, a power spectrum and its associated structure function with inner and outer scales effects and anisotropy is shown. The power spectrum includes an effective anisotropic parameter to describe anisotropy and it is useful to model optical turbulence when both a non-Kolmogorov power law and anisotropy along the direction of propagation are present.
- (010.1290) Atmospheric and oceanic optics : Atmospheric optics
- (010.1300) Atmospheric and oceanic optics : Atmospheric propagation
- (010.1330) Atmospheric and oceanic optics : Atmospheric turbulence
(CV) Independence and interaction of luminance and chromatic contributions to spatial hyperacuity performance
- received 09/30/2013; accepted 02/02/2014; posted 02/03/2014; Doc. ID 198653
- [full text: PDF (1336) KB)]
- Abstract: Here we test interactions of luminance and chromatic input to spatial hyperacuity mechanisms. First, we tested alignment with matching or mismatching (contrast polarity or modality) grating pairs that were adjusted to detection threshold. Thresholds with mismatched pairs were significantly elevated. Second, we determined alignment acuity as a function of luminance or chromatic contrast alone or in the presence of contrast pedestals. For in-phase pedestal conditions, performance followed the envelope of the more sensitive mechanism. However, polarity reversals revealed an asymmetric effect for luminance and chromatic conditions. This suggests that luminance can overrule chromatic mechanisms in hyperacuity; we interpret these findings in the context of spatial mechanisms.
- (330.1720) Vision, color, and visual optics : Color vision
- (330.5510) Vision, color, and visual optics : Psychophysics
- (330.6100) Vision, color, and visual optics : Spatial discrimination