International Business Machines Corporation

John Alan Gerth

Michael Thomas Wheatley

Shawn Anthony Hall

Lawrence David Bergman

John Timothy Robinson

William Louis Luken

Bernice E Rogowitz

James A Brown

Production and processing of data representing digitized images are disclosed. The disclosure addresses the problem of providing an image which simultaneously represents both high spatial resolution information and low spatial resolution information which pertains to the high spatial resolution information. Images may be produced which represent high spatial resolution information in the form of relative luminance contrasts, and represent low spatial resolution information in the form of color variance. Images representing high spatial resolution information may be altered to represent areas sharing a common trait (low spatial resolution information) by altering image data to make all pixels of those areas a common color, while scaling the luminance of each altered pixel by a uniform factor relative to its luminance in the original representation of the image.

Method, system and program products for displaying multiple types of

The rasterization process is separated into two modes, a test mode and a normal mode, to eliminate shading calculations associated with all-hidden triangles, thereby providing improved efficiency over prior rasterization schemes.

Efficient two-pass rasterization scheme utilizing visibility information

APL, an interpretive processor, cooperates with external routines by calling those external routines to process data passed to them and receives results from the external routines. The called external routines, during their respective execution of the call, can request internal services of the calling APL interpretive processor. Such requests include execution of internal APL functions or operators, calling other external routines, recursive execution of external routines, and setting or obtaining values of internal APL data items.

Message interface and method for recursive calling between interpretive

A method for executing external processes and for accessing external data from within an interactive language workspace. The workspace task referencing the external processes or data is synchronized and locked until the process is completed or the data referenced. The method steps provide establishing a message interface and utilize coercion of arguments in a dynamic environment. This permits, for instance, the invocation of a FORTRAN language process or from within an APL workspace and a return of information from said external processor without terminating the APL workspace.

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Danbury, CT, United States of America

John Alan Gerth