Image analysis – Applications – Range or distance measuring
Patent
1992-12-07
1996-11-05
Boudreau, Leo
Image analysis
Applications
Range or distance measuring
382118, 382171, 382174, 382210, G06K 900, G06K 934, G06K 946, G06K 976
Patent
active
055725953
ABSTRACT:
A method for detecting the location of a human being in three dimensions from a spatial image of an area that is generated using a lens. Portions of the image having density values within a predetermined range are labeled, those density values corresponding to brightness levels of the pixels in the image. A labeled portion corresponding to a part of the head is selected when the top region of that portion forms the shape of an arch. The width of the selected portion is then determined. Assuming that the part of the head having hair on all persons has a constant horizontal width, the distance from a lens to a human being is calculated based on the determined width of the selected portion. The coordinates of the person are determined based on that distance.
REFERENCES:
patent: 4975978 (1990-12-01), Ando et al.
patent: 5016173 (1991-05-01), Kenet et al.
"Determination of Camera Location and Orientation", Kumar, Rakesh, Image Understanding Workshop, 1989, pp. 870-881.
"Photogrammetry & Stereo", Berthold Klaus Paul Horn, Robot Vision, MIT Press, pp. 299-326.
Hong Zi Quan
Kumagai Ryohei
Boudreau Leo
Davis Monica S.
Yozan Inc.
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