Method to determine colors of objects, especially teeth; involves using calibration card under different light conditions to determine calibration factors for correcting image obtained with video camera

摘要

In a calibration step, a true-color image and a color scale on a white calibration card are imaged at a given light. The image and the color values for the calibration card are stored. In a first detection step, the calibration card is imaged under the new lighting, and the red-blue-green values are compared with the stored values. The variance is used to correct the color of the imaged object under the new lighting.