Method and apparatus for transforming coordinate systems in an a

Details Method and apparatus for transforming coordinate systems in an a Method and apparatus for transforming coordinate systems in an a

1994-06-13

1996-04-23

Chin, Tommy P.

Television

Monitoring, testing, or measuring

Testing of image reproducer

H04N 1704

Patent

active

055108334

ABSTRACT:
A system for transforming coordinate systems in an automated video monitor alignment system includes a camera and computer to capture an image of the display bezel surrounding the cathode ray tube and of the image displayed on the CRT. Three dimensional models of the CRT tube and display bezel are used to compute and compensate for camera perspective. Camera pixel data can then be transformed to `flat plane` coordinates. When the relative orientation of the camera and CRT are corrected for, the effects of parallax can be eliminated, allowing more accurate inspection, measurement, and lower cost fixturing on the production line. Thus, an accurate coordinate transformation from a camera-referenced coordinate system to a monitor-referenced coordinate system is made.

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