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2. Projection (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Projection_(mathematics)

   In mathematics, a projection is an idempotent mapping of a set (or other mathematical structure) into a subset (or sub-structure). In this case, idempotent means that projecting twice is the same as projecting once. The restriction to a subspace of a projection is also called a projection, even if the idempotence property is lost.

3. Projector - Wikipedia

   en.wikipedia.org/wiki/Projector

   A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers. A virtual retinal display, or retinal ...

4. Keystone effect - Wikipedia

   en.wikipedia.org/wiki/Keystone_effect

   The keystone effect is the apparent distortion of an image caused by projecting it onto an angled surface. It is the distortion of the image dimensions, such as making a square look like a trapezoid, the shape of an architectural keystone, hence the name of the feature. In the typical case of a projector sitting on a table, and looking upwards ...

5. Projection screen - Wikipedia

   en.wikipedia.org/wiki/Projection_screen

   Projection screen in a movie theater. Home theater projection screen displaying a high-definition television image. A projection screen is an installation consisting of a surface and a support structure used for displaying a projected image for the view of an audience. Projection screens may be permanently installed on a wall, as in a movie ...

6. Map projection - Wikipedia

   en.wikipedia.org/wiki/Map_projection

   The study of map projections is primarily about the characterization of their distortions. There is no limit to the number of possible map projections. [ 7]: 1 More generally, projections are considered in several fields of pure mathematics, including differential geometry, projective geometry, and manifolds. However, the term "map projection ...

7. List of CRT video projectors - Wikipedia

   en.wikipedia.org/wiki/List_of_CRT_video_projectors

   Internal prism focus system with a single projection lens. 50 inch fixed screen projector with two projector lenses with three tubes. 60 fL on screen brightness. 72 inch fixed screen projector with two projector lenses with crt three tubes. 30 fL on screen brightness. 50 inch screen projector.