Patent ID: 6133950
Filing Date: 2000-10-17
Classification: G09G,H04N

Abstract:
A method of checking the calibration of a display system comprising the steps of:(a) generating a visual calibration test pattern intended to be displayed on a display means of the system and observed by the human eye, the test pattern comprising at least a first part formed by several separate regions each composed of a first area having a first light level and a second area having a second light level, all the light levels being different from one another and the difference between the two levels of the two areas of a region being predetermined and the same for all the regions;(b) determining an overall transfer function from a first predefined transfer function of the calibrated display system and a second predefined transfer function from a mathematical model of the human visual system;(c) determining a digital calibration image corresponding to the calibration test pattern from the visual calibration test pattern and from the inverse of the overall transfer function;(d) providing the digital calibration image as an input to the display system and;(e) displaying the resulting image thus on the display means; and(f) checking the calibration of the display system by displaying the resulting image.