EXTENDING IMAGE DYNAMIC RANGE

摘要

Enhancing image dynamic range is described. An input video signal that is represented in a first color space with a first color gamut, which is related to a first dynamic range, is converted to a video signal that is represented in a second color space with a second color gamut. The second color space is associated with a second dynamic range. At least two (e.g., three) color-related components of the converted video signal are mapped over the second dynamic range.

主权项

1. A method to encode a video signal, the method comprising:
receiving an input video signal in a first content version in a first dynamic range and a second content version in a second dynamic range, wherein the first dynamic range is higher than the second dynamic range; applying a normalization process to the first content version and the second content version to generate a third content version, a fourth content version, and an invertible mapping function between the third and the fourth content versions, wherein the third content version represents a modified version of the first content version and the fourth content version represents a modified content version of the second content version; and generating an output coded bit stream based on a coded representation of the fourth content version and the invertible mapping function.