Adaptive Jzazbz Color Volume Mapping for HDR Displays
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Solution Overview
Problem
Existing image processing techniques face challenges in bridging the dynamic range and color gamut differences between image capture and display devices, leading to inefficiencies and resource penalties, particularly in non-uniform color spaces like YUV, which affect latency, memory, and processing resources.
Innovation Solution
Perform tone mapping and inverse tone mapping operations in a perceptually uniform color space, such as Jzazbz, using two-dimensional lookup tables to convert and map image data, and employ adaptive color volume mapping to adjust brightness, contrast, and saturation based on device capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If tone mapping operations are performed in non-uniform color spaces like YUV, then image processing can be accomplished, but latency and computational load increase
Solution Approach 1:
The patent changes the fundamental parameter of color space uniformity by transitioning from non-uniform color spaces (YUV) to perceptually uniform color spaces (Jzazbz). This parameter change enables more efficient tone mapping operations that reduce computational load and processing latency while maintaining image quality, directly resolving the technical contradiction between processing speed and color space complexity.
2Manufacturing precision
If adaptive color volume mapping is implemented to preserve image details, then image quality is maintained, but processing resources are consumed
Solution Approach 1:
The patent segments the tone mapping process into distinct operational stages within the Jzazbz color space: luminance mapping for brightness/contrast adjustment and chromaticity mapping for saturation preservation. This segmentation allows the system to apply targeted processing to different image attributes, preserving fine details and aesthetics while optimizing resource consumption by avoiding unnecessary full-color-space processing.
3Reliability
If high dynamic range processing is performed to utilize full display capabilities, then image realism is improved, but device compatibility decreases
Solution Approach 1:
The patent introduces the Jzazbz perceptually uniform color space as an intermediary between the source image data and the target display device. This intermediary color space serves as a universal translation medium that can represent both HDR and SDR content accurately, enabling the system to process high dynamic range images for realistic display while maintaining compatibility with various display devices through adaptive mapping to their specific capabilities.
Data Source
AI summary
This disclosure provides methods, devices, and systems for color volume mapping (CVM) techniques that operate in the Jzazbz color space. In some aspects, an image processor may receive image data having color channels associated with a color space that is not perceptually uniform and may convert the image data to the Jzazbz color space. The image processor may perform a global CVM operation which maps a range of Jz, az, and bz values supported by the image source to a range of jz, az, and bz values supported by the image target. The image processor may further perform a local CVM operation which adaptively tunes the Jz, az, and bz channels of image data based on various properties of the received image. Still further, the image processor may adaptively blend Jz values at the edges of objects and other features to preserve details in low-contrast regions of the received image.