Image processing methods and apparatus using localized gamut definitions

摘要

Methods and apparatus are provided for encoding and decoding image data using localized gamut definitions. The localized gamut definitions may be defined based on gamut characteristics of the image data. A gamut transform is applied to the image data wherein color coordinates specified by the image data are mapped to corresponding color coordinates in the localized gamut definition. Use of localized gamut definitions may facilitate image data compression of increased color depth specification of image data.

主权项

1. A method of encoding image data for transmission to a downstream device, the method comprising:
receiving image data, the image data having a format and a content gamut; determining one or more gamut characteristics of the image data; based at least in part on the gamut characteristics, determining a localized gamut definition for the image data; and applying a gamut transform to the image data wherein color coordinates specified by the image data are mapped to corresponding color coordinates of the localized gamut definition; and wherein a gamut of the image data having the format is a range of colors capable of being represented by the format; the content gamut of the image data is a range of colors present in the image data; and the localized gamut definition defines fewer color coordinate values than the gamut of the image data having the format.