Browse Prior Art Database

Interaction with a Projected Image

IP.com Disclosure Number: IPCOM000086153D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Young, JER: AUTHOR

Abstract

For interaction with a static projected image such as from a photographic projector or a storage tube, a raster is superimposed on the image so that a light pen can be used. A block diagram of the control system is shown in Fig. 1.

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Interaction with a Projected Image

For interaction with a static projected image such as from a photographic projector or a storage tube, a raster is superimposed on the image so that a light pen can be used. A block diagram of the control system is shown in Fig. 1.

One suitable optical system refreshed is shown in Fig. 2. The images from a storage tube and a refreshed CRT are superimposed by a Glazebrook prism beam splitter 1. The light from lamp 2 and its mirror 3 is split by the Glazebrook prism 1; half is directed onto the reflective storage tube, and the other half is stopped at 4. Alternatively, a liquid-filled folded Schmidt system can be used, as shown in Fig. 3, to project the CRT image, and keep the tube-face cool and clean.

The shape and nature of the interactive raster can freely be changed in accordance with the projected image. Thus it can be a menu at one edge of a projected image and then be changed to cover the whole image. To help interaction, the selected coordinates at which interaction is required may be offset from the light pen position.

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