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A safety pin. Aichmophobia (/ ˌ eɪ k m ə ˈ f oʊ b i ə /) is a kind of specific phobia, the morbid fear of sharp things, [1] such as triangles, stars, squares, pencils, needles, knives, darts, prickly plants (like thistles and similar weeds), cactus trees, pine needles, broken glass, broken porcelain, sharp pieces of wood, a pointing finger, hexagons, or even the sharp end of an umbrella ...
Underside of a groin vault showing the arris. In architecture, an arris is the sharp edge formed by the intersection of two surfaces, such as the corner of a masonry unit; [1] the edge of a timber in timber framing; the junction between two planes of plaster or any intersection of divergent architectural details.
Stair dust corners are used on staircases at the point where the tread, riser, and stringer meet. Dust corners make household chores such as sweeping and vacuuming more convenient. [1] Stair dust corners originated in the 1880s, during the Victorian era. Dust corners typically have a small hole in the middle so a nail can be hammered into the ...
Obsolete cannons were often used as wheel guards in the Netherlands, such as for the Catherine's gate in Dordrecht. A guard stone, jostle stone or chasse-roue (French lit. "wheel chaser"), is a projecting metal, concrete, or stone exterior architectural element located at the corner and/or foot of gates, portes-cochères, garage entries, and walls to prevent damage from vehicle tires and wheels.
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Corner detection is an approach used within computer vision systems to extract certain kinds of features and infer the contents of an image. Corner detection is frequently used in motion detection, image registration, video tracking, image mosaicing, panorama stitching, 3D reconstruction and object recognition.