Input coordinate transformation apparatus for converting coordinates input from a coordinate input device into coordinates in a display coordinate system for displaying images on a display
US6353434B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1999 |
| Grant date | Mar 5, 2002 |
| Priority date | — |
| Expiry date | Aug 2, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0418
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A control program designates two-dimensional coordinates in an image-displaying two-dimensional coordinate system and displays four mark images on a display screen. A touch panel obtains two-dimensional coordinates in a two-dimensional coordinate system inherent in the touch panel according to user operation corresponding to the four mark images. A touch-panel device driver obtains the coefficients in predetermined coordinate transformation expressions according to the two kinds of four coordinates, and performs coordinate transformation using the coordinate transformation expressions to convert two-dimensional coordinates in the touch-panel-inherent two-dimensional coordinate system that have been transmitted from the touch panel into two-dimensional coordinates in the image-displaying two-dimensional coordinate system and transfer the converted coordinates to an operating system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.