Patent ID: 9679366
Date: 2017-06-13
CPC Classifications: G06T,H04N

Claim:
1. A method to perform color grading for obtaining a higher dynamic range color graded image, the method comprising the following computer-implemented steps: providing an ungraded image; providing a color graded lower dynamic range image representing the same material as the ungraded image; spatially and temporally aligning the ungraded image and the color graded lower dynamic range image thereby obtaining an aligned ungraded image; and color grading the aligned ungraded image based on the color graded lower dynamic range image, thereby obtaining the higher dynamic range color graded image, wherein: (a) the spatially and temporally aligning comprises: detecting feature points in the ungraded image and in the color graded lower dynamic range image; matching the feature points; and estimating a transformation between the ungraded image and the color graded lower dynamic range image, based on the matching of the feature points, and (b) the detecting further comprises extracting feature descriptors in at least one local region of the ungraded image and at least one local region of the color graded lower dynamic range image, and wherein the matching further comprises matching the feature descriptors.