Apparent Motion in Geometric Depth

1965 ◽  
Vol 7 (3) ◽  
pp. 215-218 ◽  
Author(s):  
R. E. Wienke ◽  
W. C. Steedman
Keyword(s):  
Point Source ◽  
Light Source ◽  
Apparent Motion ◽  
Visual Angle ◽  
Apparent Movement ◽  
Guidance System ◽  
Visual Guidance ◽  
Point Light Source ◽  
Point Light

The ability to detect small excursions of apparent movement of a point light source was investigated. Apparent movement was achieved by alternately presenting a point source in two different planes. The presentations, each lasting about 500 milliseconds, had an overlap of approximately 8 milliseconds. Using 7 subjects, the limen for apparent motion was a stimulus separation of 43.9 mm, which is a visual angle of 1′ 21″. Possible application of the effect in a highly precise visual guidance system is discussed in light of the results.

A confocal laser scanning microscope for fluorescence and reflection at video rates

1989 ◽  
Vol 47 ◽  
pp. 134-135
Author(s):  
P.M. Houpt ◽  
A. Draaijer
Keyword(s):  
Light Source ◽  
Laser Scanning ◽  
Focal Point ◽  
Confocal Laser Scanning Microscope ◽  
Confocal Laser ◽  
Point Light Source ◽  
Volume Of Interest ◽  
Ion Laser ◽  
Point Light ◽  
Point Detector

In confocal microscopy, the object is scanned by the coinciding focal points (confocal) of a point light source and a point detector both focused on a certain plane in the object. Only light coming from the focal point is detected and, even more important, out-of-focus light is rejected.This makes it possible to slice up optically the ‘volume of interest’ in the object by moving it axially while scanning the focused point light source (X-Y) laterally. The successive confocal sections can be stored in a computer and used to reconstruct the object in a 3D image display.The instrument described is able to scan the object laterally with an Ar ion laser (488 nm) at video rates. The image of one confocal section of an object can be displayed within 40 milliseconds (1000 х 1000 pixels). The time to record the total information within the ‘volume of interest’ normally depends on the number of slices needed to cover it, but rarely exceeds a few seconds.

scholarly journals Light Structure from Pin Motion: Geometric Point Light Source Calibration

2020 ◽  
Vol 128 (7) ◽  
pp. 1889-1912
Author(s):  
Hiroaki Santo ◽  
Michael Waechter ◽  
Wen-Yan Lin ◽  
Yusuke Sugano ◽  
Yasuyuki Matsushita
Keyword(s):  
Light Source ◽  
Point Light Source ◽  
Geometric Point ◽  
Point Light

Spark point light source

1981 ◽  
Vol 52 (4) ◽  
pp. 624-625
Author(s):  
Harold E. Edgerton ◽  
Vernon E. MacRoberts
Keyword(s):  
Light Source ◽  
Point Light Source ◽  
Point Light

Continuous-emission laser using Dy2+ in CaF2 excited by a point light source

1965 ◽  
Vol 2 (2) ◽  
pp. 91-93
Author(s):  
A. A. Kaminskii ◽  
L. S. Kornienko ◽  
D. M. Litvak ◽  
V. V. Osiko ◽  
A. M. Prokhorov
Keyword(s):  
Light Source ◽  
Continuous Emission ◽  
Point Light Source ◽  
Point Light

scholarly journals Horocycles of Light in a Ferrocell

2021 ◽  
Vol 6 (3) ◽  
pp. 30
Author(s):  
Alberto Tufaile ◽  
Michael Snyder ◽  
Adriana Pedrosa Biscaia Tufaile
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
External Magnetic Field ◽  
Light Source ◽  
Geometrical Theory ◽  
Thin Structures ◽  
Point Light Source ◽  
Geometrical Theory Of Diffraction ◽  
Point Light ◽  
The Magnetic Field

We studied the effects of image formation in a device known as Ferrocell, which consists of a thin film of a ferrofluid solution between two glass plates subjected to an external magnetic field in the presence of a light source. Following suggestions found in the literature, we compared the Ferrocell light scattering for some magnetic field configurations with the conical scattering of light by thin structures found in foams known as Plateau borders, and we discuss this type of scattering with the concept of diffracted rays from the Geometrical Theory of Diffraction. For certain magnetic field configurations, a Ferrocell with a point light source creates images of circles, parabolas, and hyperboles. We interpret the Ferrocell images as analogous to a Möbius transformation by inversion of the magnetic field. The formation of circles through this transformation is known as horocycles, which can be observed directly in the Ferrocell plane.

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