Patent ID: 9454810
Filing Date: 2016-09-27
CPC Classification: G06T,H04N

Claim Text:
1. A method of correcting input chrominance values of pixels to determine corrected chrominance values for the pixels based on tone-mapped luminance values which have been determined by applying tone mapping to input luminance values of the pixels, the method comprising: determining candidate corrected chrominance values for the pixels based on the input chrominance values, the input luminance values and the tone-mapped luminance values, such that for each of the pixels, a first saturation determined from the input luminance value and the input chrominance value has a predetermined relationship to a second saturation determined from the tone-mapped luminance value and the candidate corrected chrominance value; determining confidence weightings which indicate confidences in the respective candidate corrected chrominance values, wherein the confidence weightings are determined in dependence on the input luminance values of the respective pixels; and using the determined confidence weightings to compute, for each of the pixels, a weighted combination of the respective candidate corrected chrominance value and the respective input chrominance value, thereby determining the corrected chrominance values for the pixels.