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Peephole Optimizer
A peephole, peekhole, spyhole, doorhole, magic eye, magic mirror or door viewer is a small, round opening through a door from which a viewer on the inside of a dwelling may "peek" to see directly outside the door. The lenses are made and arranged in such a way that viewing is only possible in one direction. The opening is typically no larger than the diameter of a dime (). In a door, usually for apartments or hotel rooms, a peephole enables to see outside without opening the door nor revealing one's presence. Glass peepholes are often fitted with a fisheye lens to allow a wider field of view The field of view (FOV) is the angle, angular extent of the observable world that is visual perception, seen at any given moment. In the case of optical instruments or sensors, it is a solid angle through which a detector is sensitive to elec ... from the inside. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Barack Obama Looking Through The Oval Office Door Peephole
Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party (United States), Democratic Party, he was the first African American president in American history. Obama previously served as a U.S. senator representing Illinois from 2005 to 2008 and as an Illinois state senator from 1997 to 2004. Born in Honolulu, Hawaii, Obama graduated from Columbia University in 1983 with a Bachelor of Arts degree in political science and later worked as a community organizer in Chicago. In 1988, Obama enrolled in Harvard Law School, where he was the first black president of the ''Harvard Law Review''. He became a civil rights attorney and an academic, teaching constitutional law at the University of Chicago Law School from 1992 to 2004. In 1996, Obama was elected to Illinois Senate career of Barack Obama, represent the 13th district in the Illinois Senate, a position he held until 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Gate At Vaxholm Fortress (41800)
A gate or gateway is a point of entry to or from a space enclosed by walls. The word is derived from Proto-Germanic ''*gatan'', meaning an opening or passageway. Synonyms include yett (which comes from the same root word) and portal. The concept originally referred to the gap or hole in the wall or fence, rather than a barrier which closed it. Gates may prevent or control the entry or exit of individuals, or they may be merely decorative. The moving part or parts of a gateway may be considered "doors", as they are fixed at one side whilst opening and closing like one. A gate may have a latch that can be raised and lowered to both open a gate or prevent it from swinging. Gate operation can be either automated or manual. Locks are also used on gates to increase security. Larger gates can be used for a whole building, such as a castle or fortified town. Doors can also be considered gates when they are used to block entry as prevalent within a gatehouse. Purpose-specific types ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Dime (United States Coin)
The dime, in United States usage, is a ten- cent coin, one tenth of a United States dollar, labeled formally as "one dime". The denomination was first authorized by the Coinage Act of 1792. The dime is the smallest in diameter and is the thinnest of all U.S. coins currently minted for circulation, being in diameter and in thickness. The obverse of the current dime depicts the profile of President Franklin D. Roosevelt and the reverse has an olive branch, a torch, and an oak branch, from left to right respectively. The word ''dime'' comes from the Old French ''disme'' (Modern French">-4; we might wonder whether there's a point at which it's appropriate to talk of the beginnings of French, that is, when it wa ... ''disme'' (Modern French dîme), meaning "tithe" or "tenth part", from the Latin ''decima [pars]''. The dime is currently the only United States coin in general circulation that is not denominated in terms of dollars or cent (United States coin), cents. , the dime co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Door
A door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. The created opening in the wall is a ''doorway'' or ''portal''. A door's essential and primary purpose is to provide security by controlling access to the doorway (portal). Conventionally, it is a panel that fits into the doorway of a building, room, or vehicle. Doors are generally made of a material suited to the door's task. They are commonly attached by hinges, but can move by other means, such as slides or counterbalancing. The door may be able to move in various ways (at angles away from the doorway/portal, by sliding on a plane parallel to the frame, by folding in angles on a parallel plane, or by spinning along an axis at the center of the frame) to allow or prevent ingress or egress. In most cases, a door's interior matches its exterior side. But in other cases (e.g., a vehicle door) the two sides are radically different. Many doors incorporate lock ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Apartment
An apartment (American English, Canadian English), flat (British English, Indian English, South African English), tenement (Scots English), or unit (Australian English) is a self-contained housing unit (a type of residential real estate) that occupies part of a building, generally on a single story. There are many names for these overall buildings (see below). The housing tenure of apartments also varies considerably, from large-scale public housing, to owner occupancy within what is legally a Condominium (living space), condominium (strata title or commonhold) or leasehold, to tenants renting from a private landlord. Terminology The term ''apartment'' is favoured in North America (although in some Canadian cities, ''flat'' is used for a unit which is part of a house containing two or three units, typically one to a floor). In the UK and Australia, the term ''apartment'' is more usual in professional real estate and architectural circles where otherwise the term ''flat'' is u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Fisheye Lens
A fisheye lens is an ultra wide angle lens, ultra wide-angle lens that produces strong Distortion (optics), visual distortion intended to create a wide panorama, panoramic or Sphere#Hemisphere, hemispherical image. Fisheye lenses achieve extremely wide angle of view, angles of view, well beyond any rectilinear lens. Instead of producing images with straight lines of perspective (rectilinear lens, rectilinear images), fisheye lenses use a special mapping ("distortion"; for example: Lambert azimuthal equal-area projection, equisolid angle, see below), which gives images a characteristic convex non-rectilinear appearance. The term ''fisheye'' was coined in 1906 by American physicist and inventor Robert W. Wood based on how a fish would see an ultrawide hemispherical view from beneath the water (a phenomenon known as Snell's window). Their first practical use was in the 1920s for use in meteorology to study cloud formation giving them the name ''whole-sky lenses''. The angle of view ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Field Of View
The field of view (FOV) is the angle, angular extent of the observable world that is visual perception, seen at any given moment. In the case of optical instruments or sensors, it is a solid angle through which a detector is sensitive to electromagnetic radiation. It is further relevant in ''angle of view, photography''. Humans and animals In the context of human and primate vision, the term "field of view" is typically only used in the sense of a restriction to what is visible by external apparatus, like when wearing spectacles or virtual reality goggles. Note that eye movements are allowed in the definition but do not change the field of view when understood this way. If the analogy of the eye's retina working as a sensor is drawn upon, the corresponding concept in human (and much of animal vision) is the visual field. It is defined as "the number of degrees of visual angle during stable fixation of the eyes".Strasburger, Hans; Pöppel, Ernst (2002). Visual Field. In G. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Frosted Glass
Frosted glass is produced by the sandblasting or acid Glass etching, etching of clear sheet glass. This creates a pitted surface on one side of the glass pane and has the effect of rendering the glass translucent by scattering the light which passes through, thus Visual Appearance, blurring images while still transmitting light. It has 10–20% opacity. General applications include: * To achieve visual privacy while still allowing light to pass through. * To create decorative patterns on plain glass by using wax or other inhibitors to retain Transparency (optics), transparent areas. * To distribute light uniformly in a photographic contact printer. * To create an airtight seal in tubes. * Decorative, aesthetic, or artistic intent. The frosted glass effect can also be achieved by the application of Polyvinyl chloride, vinyl film, used as a sort of stencil on the glass surface. "Photo-resist", or photo-resistant film is also available, which can be produced to mask off the ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Ground Glass
Ground glass is glass whose surface has been ground to produce a flat but rough ( matte) finish, in which the glass is in small sharp fragments. Ground glass surfaces have many applications, ranging from ornamentation on windows and table glassware to scientific uses in optics and laboratory glassware. Uses Photography In photography, a sheet of ground glass is used for the manual focusing in some still and movie cameras; the ground-glass viewer is inserted in the back of the camera, and the lens opened to its widest aperture. This projects the scene on the ground glass upside down. The photographer focuses and composes using this projected image, sometimes with the aid of a magnifying glass (or loupe). In order to see the image better, a dark cloth is used to block out light, whence came the image of the old-time photographer with his head stuck under a large black cloth. A ground glass is also used in the reflex finder of an SLR or TLR camera. In motion-picture cameras ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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Door Furniture
Door furniture (British English, British and Australian English) or door hardware (North American English) refers to any of the items that are attached to a door or a Drawer (furniture), drawer to enhance its functionality or appearance. Design of door furniture is an issue to disability, disabled persons who might have difficulty opening or using some kinds of door, and to specialists in interior design as well as those usability professionals which often take their didactic examples from door furniture design and use. Items of door furniture fall into several categories, described below. Hinges A hinge is a component that attaches one edge of a door to the frame, while allowing the other edge to swing from it. It usually consists of a pair of plates, each with a set of open cylindrical rings (the knuckles) attached to them. The knuckles of the two plates are offset from each other and mesh together. A hinge pin is then placed through the two sets of knuckles and usually fix ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |