3D LUT Image Processing for Cross-Lighting Color Reproduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing color processing techniques for imaging devices struggle to accurately reproduce colors both within and outside the color gamut of a color chart, and are limited by light source conditions, restricting the range of colors that can be reproduced with high accuracy.
Innovation Solution
An information processing apparatus that generates a three-dimensional lookup table (3DLUT) by comparing image data captured under different environmental conditions, allowing for the conversion of color tones from one environment to another, thereby enhancing color reproduction accuracy across various lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color processing parameters are designed using a color chart, then colors within the color gamut of the color chart can be reproduced with high accuracy, but colors out of the color gamut of the color chart cannot be reproduced
Solution Approach 1:
The patent transitions from using a two-dimensional color chart to utilizing three-dimensional actually-captured image data. By incorporating the full spatial and color information from real images, the system expands the color reproduction capability beyond the limited color gamut of traditional color charts while maintaining accuracy through comprehensive color space mapping.
Solution Approach 2:
The patent changes the fundamental parameters used for color processing from standardized color chart values to actual captured image data under various lighting conditions. This parameter change enables the system to adapt to different environments and reproduce colors accurately across a broader gamut by learning from real-world imaging scenarios.
2Productivity
If representative colors are extracted from actually-captured images and a three×three matrix is used for conversion, then conversion is efficient, but the technique is limited in light source condition and object type
Solution Approach 1:
The patent creates a universal color processing system that can handle various light sources and object types through a single comprehensive 3DLUT. Instead of requiring separate processing for different conditions, the three-dimensional lookup table learned from diverse actually-captured images provides multi-functional color conversion capability across different lighting environments and object categories.
Solution Approach 2:
The patent performs preliminary learning and analysis of color relationships under various lighting conditions and object types during the 3DLUT generation phase. By pre-processing and capturing the essential color conversion patterns from diverse actually-captured images beforehand, the system enables efficient real-time color conversion without needing to reprocess each new image individually.
Data Source
AI summary
An apparatus includes an acquisition unit configured to acquire a pair of first data and second data, the first data being obtained by imaging an object under a first environment, the second data being obtained by imaging the object under a second environment, and a processing unit configured to generate a three-dimensional lookup table by using the pair of the first data and the second data, the three-dimensional lookup table holding a condition for image processing to convert the first data into the second data.