Color Mapping Function Estimation for Artistic Intent Preservation
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Solution Overview
Problem
Existing color mapping methods fail to preserve the artistic intent when transitioning between different color-graded versions of a picture, often resulting in saturated or intermediate color values that degrade the visual aspect of the mapped picture.
Innovation Solution
A method for estimating a color mapping function between two color-graded versions of a picture, which involves obtaining estimates of color transforms, detecting and reducing dynamic range exceeding values to prevent saturation, and iteratively refining the color mapping using scaling factors and histogram analysis to ensure accurate representation of color values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a default color mapping function is used to map between color volumes, then the mapping process is simple and fast, but the artistic intent is not preserved and color saturation occurs
Solution Approach 1:
The patent changes the parameters of the color mapping function by estimating transforms based on actual color values from both color-graded versions rather than using fixed default parameters. This involves calculating scaling factors and offset values that adapt to the specific picture content, thereby preserving artistic intent while maintaining computational efficiency.
Solution Approach 2:
The patent implements feedback by using the actual color values from the second color-graded version to refine and adjust the color mapping function. The estimated transform is validated against the target color values, and adjustments are made to scaling factors and other parameters to minimize color differences, ensuring both accuracy and artistic preservation.
2Reliability
If color values are clipped to prevent saturation, then the dynamic range is controlled, but the visual quality degrades due to loss of color information
Solution Approach 1:
The patent applies preliminary action by pre-calculating scaling factors and adjusting the color mapping function before saturation occurs. By estimating the transform and detecting potential saturation issues in advance, the system adjusts parameters proactively to prevent clipping while maintaining the full dynamic range and preserving color information.
3Manufacturing precision
If a complex color mapping function with multiple transforms is used, then color accuracy is improved, but the computational complexity increases
Solution Approach 1:
The patent segments the complex color mapping function into multiple independent transforms, each handling specific aspects of color transformation. This includes separate transforms for different color components and stages, allowing each to be optimized and processed independently, thereby reducing overall computational complexity while maintaining high accuracy.
Data Source
AI summary
A method and device for processing a picture comprises estimating a color mapping between a first and a second color-graded version of the picture by estimating a color mapping function that maps the color values of the first color-graded version of the picture onto the color values of the second color-graded version of the picture.