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Browse Prior Art Database

Display With Compressed Margins

IP.com Disclosure Number: IPCOM000084128D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Young, JE: AUTHOR

Abstract

Those parts of an image extending to the margins 1 (Fig. 1) of a display 2 are displayed compressed. This enables an operator to determine if a misaligned image need be aligned, and consequently enables a designer of display equipment to use margins smaller than worst-case tolerances. The idea is also useful for the display of data with more addressable than displayable points.

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Display With Compressed Margins

Those parts of an image extending to the margins 1 (Fig. 1) of a display 2 are displayed compressed. This enables an operator to determine if a misaligned image need be aligned, and consequently enables a designer of display equipment to use margins smaller than worst-case tolerances. The idea is also useful for the display of data with more addressable than displayable points.

Compression can take place optically before scanning an object, by prisms, mirrors, cylindrical lenses, fiber optics or distorting lenses; or can be caused during scanning by nonregular scan devices, nonuniform scan motion, nonlinear scan rasters or interlace of different sized rasters; or can be caused after scanning by compression of digital data, a nonlinear display raster or point-to- point plotting, or compression into a grey scale or artificial color.

An optical arrangement suitable for microfilm and using a cylindrical lens is shown in Fig. 2. The cylindrical lens is at the.intermediate focus of the conventional lens system. For detecting images on paper, where curvature of the image is permissible, the underside of the glass platen supporting the paper can be shaped to form a cylindrical lens.

Compression of a linearly detected image can be done by recording each line of the image as, say, 1536 picture elements (pels). The first 256 pels are compressed, for example by the use of feedback shift registers, the next 944 pels are unchanged, and the final...