Rear Projection

Rear Projection


a special effects technique in which real objects, such as actors playing a scene, are filmed against a background that was shot earlier on motion picture or still film and that is projected onto a screen behind the objects being filmed. The rear-projection screen is a translucent screen on which an image is created by rays passing through it. A special projector, the rear projector, is placed behind the rear-projection screen, where it does not hinder the actors from performing in immediate proximity to the screen. This permits a sufficiently sharp composite picture to be obtained despite the shallow depth of field of the camera lens. Rear projection makes possible combinations of action and objects separated in space and time and, unlike certain other special effects techniques, permits the actor to see the background image during the filming, which is very important for coordinating the actor’s speech and actions with the events projected on the rear screen.

The rear-projection screen may fill the entire frame or only part of the frame, as when a landscape is shown outside a window or open door. The background image on the rear screen may be still or moving. For still backgrounds, dirsquoitive projectors with a powerful, water-cooled light source are used. Moving images are projected using low-noise projectors with a high light output. The projection is usually run at standard speed. In order for the timing of the exposure of the composite image to coincide with the timing of projection of the background image, the camera’s mechanism must operate synchronously and in phase with the rear projector’s mechanism.

Rear projection may be used in stop-motion photography, with irregular time intervals between the exposure of consecutive frames, as in the making of animated films. It is also used in films with a second subsequent projection (seePROCESS PHOTOGRAPHY), as well as in combination with other special effects techniques.


Gorbachev, B. K. Tekhnika kombinirovannykh s”emok, 2nd ed. Moscow, 1961.
Kombinirovannye kinos”emki. Moscow, 1972.


References in periodicals archive ?
is preparing to terminate production and sales of rear projection televisions and concentrate its TV business resources in its Bravia liquid crystal display TVs, company officials said Thursday.
Sharp's two new models, the $3,299 56DR650 56-inch rear-projection DLP HDTV and $3,799 65DR650 65-inch rear projection DLP HDTV, will ship to retailers in March and May, respectively.
President Katsuhiko Machida said Wednesday his company will enter into the large-size rear projection television business, targeting the U.
Used with its associate software, it lets presenters run and annotate computer applications while simultaneously displaying images on rear projection or plasma displays, or on traditional screens using LCD projectors.
Rear Projection SMART Board 3000i by SMART Technologies Inc.
said Wednesday it has developed what it says is the world's first rear projection television that uses a laser as its light source instead of a mercury lamp as with current rear projection TVs.
Sony released a 70-inch rear projection TV in March but has failed to arouse strong demand due to its high price of 1.
at the International Winter Consumer Electronics Show unveiled a portable color video projection system that can emit from 10- to 100-inch rear projection.