Perspective projection is a type of drawing that graphically approximates on a planar (two-dimensional) surface (e.g. paper) the images of three-dimensional objects so as to approximate actual visual perception. It is sometimes also called perspective view or perspective drawing or simply perspective. A perspective projection drawing must be made according to an established geometric protocol. See linear perspective for a discussion of one-point, two-point and three-point perspectives. Drawing is one way of making an image: it is the process of making marks on a surface by applying pressure from or moving a tool on the surface. ... Piece of paper Paper is a thin, flat material produced by the compression of fibres. ... Linear perspective is the art of representing three-dimensional constructions on a two-dimensional surface. ...
The following terms are basic to understanding the drawing protocols of a perspective projection.
Also see: Perspective projection distortion, Perspective (visual), Perspective distortion A picture plane is the imaginary flat surface which is usually located between the station point and the object being viewed and is ordinarily a vertical plane perpendicular to the horizontal projection of the line of sight to the objects order of interest. ... A vanishing point is a point in a perspective drawing where parallel lines seem to converge into. ... A station point is the place of point where the observer is supposed to stand while viewing the object. ... For the television programme, see Horizon. ... Linear perspective is the art of representing three-dimensional constructions on a two-dimensional surface. ... Curvilinear perspective is a way of drawing using five vanishing points. ... Reverse perspective also called inverse perspective or Byzantine perspective, is a technique of perspective drawing where the further the objects are, the larger they are drawn. ... Perspective projection distortion is an error introduced in drawing when images are created by the use of projectors. Projectors are imaginary constructs which aid in the production of real images. ... Perspective when used in the context of vision and visual perception refers to the way in which objects appear to the eye based on their spatial attributes or dimension and the position of the eye relative to the objects. ... In imaging, there are two types of perspective distortion: Perspective projection distortion Perspective distortion (caused by camera to subject distance) This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ...
Both types of projection involve a distortion; parallel lines never intersect in nature, but they always intersect in perspectiveprojections, with the rare exception wherein both the surface of projection is planar and an object plane is spatially parallel to the plane of projection.
Mathematically, the difference between artifical perspectiveprojection (perspectiveprojection onto a flat surface) and natural perspectiveprojection (perspectiveprojection onto a spherical surface) is a distortion resulting from the small-angle approximation which results from projecting onto a flat surface.
In an artificial perspectiveprojection, every car on the road would be drawn at the same size, even though it is clear in reality, that the farther away from the center of the picture that a car is, the farther away from the viewer that car would be.
Perspective in the graphic arts, such as drawing, is an approximate representation on a flat surface (such as paper) of an image as it is perceived by the eye.
Natural perspectiveprojection is the name given by Leonardo to the projection that produces the image beheld by the human eye.
Both types of projection involve a distortion; parallel lines never intersect in nature, but they always intersect in perspectiveprojections (with the exception in classical perspectiveprojection where the parallel lines are parallel to the picture plane).
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