The present invention relates to a method for the colorimetric measurement of a defined region on an image representing a surface, characterized in that the said image of the said surface is taken using a color camera, in that the analogue information measured on the said surface is transformed and converted...http://www.google.com.au/patents/US6614530?utm_source=gb-gplus-sharePatent US6614530 - Method and device for the colorimetric measurement of a colored surface
