Browse Prior Art Database

Semi-Automatic Front of Screen Geometry Set-Up using Touch

IP.com Disclosure Number: IPCOM000114870D
Original Publication Date: 1995-Feb-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 126K

Publishing Venue

IBM

Related People

Harley, M: AUTHOR [+2]

Abstract

The unique data inputs provided by touch-screen technology can be combined with automatic display adjustment to facilitate a new method for setting up the front of screen geometry. This semi-automatic set-up method can be used on any CRT based displays which can have its geometry automatically adjusted.

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Semi-Automatic Front of Screen Geometry Set-Up using Touch

      The unique data inputs provided by touch-screen technology can
be combined with automatic display adjustment to facilitate a new
method for setting up the front of screen geometry.  This
semi-automatic set-up method can be used on any CRT based displays
which can have its geometry automatically adjusted.

      The purpose of front of screen geometry set-up is to size,
shape and position the image produced by displays.  Set-up of front
of screen geometry by human operators can lack repeatability.  Fully
automatic set-up can be achieved with the use of sophisticated and
expensive vision systems which offers repeatability, but image
processing requirements often makes these systems slower than the
manual alternative.  The semi-automatic set-up method described here
gives the repeatability of an automatic system without requiring the
capital outlay needed for a vision system.  Opportunity for speed
improvements over manual set-up also exists.

      The set-up method is described in the following.  Initially,
the theory and assumptions behind the method are presented.  This is
followed by a description of the application of the set-up method.
Finally, a discussion of the advantages of using this set-up method
is given.

      Theory and Assumptions - "Automatic adjustment" is intended to
convey that variation of front of screen geometry can be achieved
without a direct manual operation i.e., without turning a pot or
adjusting a control.

      The touch feature used by this geometry set-up method is
assumed, for the purposes of description simplicity, to be integrated
into the CRT face-plate.  However, the method described can be
applied equally to any automatically adjustable display by using a
"touch tool" (e.g., a touch mask which could fit over the CRT
face-plate) as part of the set-up equipment.

      "Touch space" is considered to be the CRT face-plate as sensed
by the touch feature.  Touching any point on the CRT face-plate will
cause the touch feature to return data uniquely identifying that
point - its touch space coordinate.

      "Critical point" is a term used to refer to a point on the
surface of the CRT face-plate under which a known part of an image
should be aligned for correct set-up of the image.

      Geometry Set-Up Method - Semi-automatic geometry set-up using
touch is a two phase process - preparation and alignment.

      Preparation - A mask with holes in the position of the critical
points is placed over the display.  These critical points might be
the corner points of an image.  When the critical points are touched
the touch feature will return the "touch space" co-ordinates of the
critical points.  The mask is not required for the next phase.

      Alignment - An image is displayed on the Display Under Test
(DUT) and an operator touches the image points which should
correspond to the critical points...