TL;DR: A camera can create a combined image on the film with two different light sources, and it comprises a slide projecting device mounted between the camera lens and the camera body as mentioned in this paper, which is particularly useful and convenient for a sight-seeing traveller to put his (or her) own portrait against a landscape or architecture background without bothering other people to take a picture for him or using a tripod.
Abstract: A camera can create a combined image on the film with two different light sources, and it comprises a slide projecting device mounted between the camera lens and the camera body. Upon inserting a mask and a slide transparency into the slide projecting device, the subject image on the slide will be projected and merged with external image coming through the camera lens to form a combined image on the film without using darkroom montage technique or photo studio facilities; it is particularly useful and convenient for a sight-seeing traveller to put his (or her) own portrait against a landscape or architecture background without bothering other people to take a picture for him (or her) or using a tripod.
TL;DR: In this article, a screen shape is drawn by a viewing frustum of the projector, and obtained overlapping images are subjected to gradation, and a resultant image is stored as image data for luminance adjustment for the projector.
Abstract: PROBLEM TO BE SOLVED: To quickly perform image processing at high speed and to cope with a screen having an arbitrary shape in a multi-image projection method of projecting images with inconspicuous joints. SOLUTION: Mapping using a projecting frustum of one of projectors having adjacent projection ranges is preliminarily performed, and a screen shape is drawn by a viewing frustum of the projector, and obtained overlapping images are subjected to gradation, and a resultant image is stored as image data for luminance adjustment for the projector. The same processing is performed for other projectors, and resultant images are stored as image data for luminance adjustment for respective projectors. Each time storage of a one-frame portion of image data is terminated in taking input images into a frame buffer in each projector, a blending function of a graphics accelerator is set to "multiplication", and inputted image data are multiplied by image data for luminance adjustment by each pixel, and the frame buffer is updated with values resulting from multiplication. COPYRIGHT: (C)2004,JPO
TL;DR: It is reported that it is possible to obtain differences between a scene and subsequent different multiple input scenes from a single photographic plate by making sequential exposures of the transparencies with a multiple aperture screen placed before the imaging lens system.
Abstract: The usual techniques of random speckle coding can be used to obtain the difference between any two transparencies from a single photographic plate. The authors report that it is possible to obtain differences between a scene and subsequent different multiple input scenes from a single photographic plate. This is realized by making sequential exposures of the transparencies with a multiple aperture screen placed before the imaging lens system. The theory and experimental results with binary objects are presented.