Hue plane color rendering for HDR displays
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Solution Overview
Problem
Visual content generated by high dynamic range (HDR) cameras often suffers from compromised contrast and radiance when displayed on devices with limited dynamic range, leading to color shifts and the need for additional rendering operations to correct hue characteristics.
Innovation Solution
Implementing color rendering on a hue plane, where three channels of color information are converted to two linearly related channels, allowing for rendering operations that maintain hue values without shifting them, thereby reducing the need for subsequent hue-correcting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If tone curves are applied to preserve radiance and contrast in limited dynamic range displays, then visual quality is improved, but hue characteristics are shifted and color accuracy deteriorates
Solution Approach 1:
The patent transforms the traditional three-channel (RGB) color space into a two-channel hue plane representation. By mapping color values onto a two-dimensional hue plane where the origin represents neutral gray and points on the perimeter represent saturated colors, the system separates luminance information (distance from origin) from hue information (angular position). This dimensional transformation allows tone curves to be applied along the radial direction (preserving hue angles) while adjusting luminance, thereby resolving the contradiction between radiance preservation and hue accuracy.
2Manufacturing precision
If additional rendering operations are applied to correct color shift, then hue accuracy is improved, but rendering complexity and resource costs increase
Solution Approach 1:
The patent performs preliminary color space transformation into the hue plane representation before applying tone curves. By pre-organizing color information in a coordinate system where hue and luminance are decoupled (hue as angular position, luminance as radial distance), the system enables direct application of tone curves without subsequent hue-correction operations. This preliminary reorganization eliminates the need for complex post-processing color correction, thereby reducing rendering complexity while maintaining hue accuracy.
Data Source
AI summary
In embodiments of color rendering on a hue plane, a color rendering module can receive three channels of color information. The color rendering module converts the three channels of color information to two channels of color information and performs a color rendering operation on the two channels of color information to provide two channels of rendered color information. The color rendering module then converts the two channels of rendered color information back to three channels of rendered color information.