DETERMINATION OF OPERATOR EYE CURRENT STATE AT CONTROL OVER VIGILANCE Russian patent published in 2015 - IPC A61B5/18 

FIELD: physics.

SUBSTANCE: operator is illuminated by the set of identical point light sources. Video camera focused to operator is used to compose the train of image frames in digital form. Area of operator eyes search is isolated in every image N^th frame and shaped to rectangle with geometrical centre and elongated in horizontal direction. Single-threshold scanning of search area is executed. Note here that isolated are image sections with intensity larger than threshold magnitude referenced to as flares and defined are their coordinates as well as the position adapted search area centre corresponding to every N+1 image frame. This is effected by calculation of averaged coordinates of flares revealed in said search area. Flares are identified caused by the reflection of light point sources from the eyes by isolation of image fragment equal for all flares and overlapping every flare and shaped to flat surface-simply-connected area. Besides, total radiation intensity in every said fragment and maximum radiation intensity with the limits of every said fragment are defined. Also, defined is the parameter averaged by at least two, preferably, perpendicular directions that describes the decreased in radiation intensity in direction to the boundary of said image fragment. Distribution intensity, total intensity, maximum radiation intensity and its mean square deflection with the outline are measured in every image fragment. Said contour is formed over the boundary of said image fragment and features identical width in the range of 1Δ-3Δ, where Δ is the size of one pixel of video camera video signal of semiconductor generator. Thereafter, analyzed flares pertinence to eye flare if the magnitude of every parameter listed above for analyzed flare does not fall beyond its threshold. Note here that the state of one eye awakening is defined by availability in said search area of one or several flares located at approx equal spacing relative to each other. While the state of both eyes opening is defined by availability in said search area of two groups of spaced apart flares clusters through distance larger than that between flares in each set. The state of both closed eyes is defined by absence of flares from operator's eyes in said search area.

EFFECT: higher validity of determination, accelerated search.

3 cl, 8 dwg