Patent Document ID: 20130329056
Application ID: 13908350
Patent Status: 0

Claim One:
1. Method to build a color calibration transform for the color calibration of an image capture device adapted for the capture of a specific scene, said color calibration being adapted to represent the captured colors of said scene in a specific output color space, an output color transform being predetermined that is able to transform any set of device-independent color coordinates representing any color in a given colorimetric color space into a set of output device-dependent color coordinates representing said color in said specific output color space, said method comprising the steps of: clustering the colors of pixels of an image representative of said specific scene captured by said image capture device into a plurality of color clusters, among said plurality, selecting a set of color clusters independently of a colour checker chart, defining a set of calibration colors within said scene such that each calibration color corresponds to a different selected color cluster, measuring each calibration color of said set such as to get a set of three calibration device-independent color coordinates to represent each calibration color in the given colorimetric color space, by using said image capture device, capturing calibration colors of said set such as to get a set of calibration device-dependent color coordinates to represent each calibration color in a device-dependent color space specific to said image capture device, estimating a parametric color transform such that any set of calibration device-dependent color coordinates corresponding to a calibration color is transformed into a set of calibration device-independent color coordinates corresponding to the same calibration color, building said color calibration transform by the concatenation of the parametric color transform with the output color transform.