Spectral Color Conversion for Flexible Camera-to-Display Reproduction
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Solution Overview
Problem
Existing methods for reproducing the color of a subject on a display require multiple videos on a reference monitor and specific lighting conditions, limiting flexibility and increasing operational complexity.
Innovation Solution
An information processing apparatus that calculates conversion information to convert RGB values from an RGB image into XYZ values using spectroscopic data of both the imaging and display environments, reducing the need for specialized hardware and enabling flexible color reproduction under varying lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple videos are displayed on a reference monitor and photographed by a camera to establish correspondence relationships, then color reproduction accuracy is improved, but device complexity and operational complexity increase
Solution Approach 1:
The patent changes the fundamental parameters of color measurement from using camera RGB values to using spectrometer-measured spectroscopic data. This allows direct calculation of XYZ values without requiring multiple video photographs and correspondence relationship establishment, thereby improving color reproduction accuracy while reducing operational complexity
Solution Approach 2:
The patent replaces the mechanical/optical system of photographing multiple videos with a camera and manually establishing correspondence relationships with a computational system that directly processes spectrometer data. This substitution eliminates the need for complex operational procedures while maintaining high color reproduction accuracy
2Measurement precision
If a reference monitor is used as a light source to photograph the subject, then color reproduction is achieved, but adaptability to different lighting conditions deteriorates
Solution Approach 1:
The patent changes the measurement approach from relying on a specific reference monitor light source to using spectrometer-measured spectroscopic data of the actual light source. This allows the system to adapt to any lighting condition by directly measuring and compensating for the spectral characteristics of the actual illuminant, thereby improving both color reproduction accuracy and adaptability
Solution Approach 2:
The patent introduces spectrometer-measured spectroscopic data as an intermediary that bridges the gap between different lighting conditions and color reproduction requirements. This intermediary allows the system to accurately reproduce colors under any lighting condition without being constrained to a specific reference monitor setup
3Measurement precision
If XYZ values are calculated using display-side spectroscopic data and color spectroscopic data, then color reproduction accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent performs preliminary calculation of the conversion matrix using display-side spectroscopic data and color spectroscopic data before actual color conversion is needed. This pre-computation approach maintains high color reproduction accuracy while reducing real-time computational complexity, as the matrix can be stored and reused for multiple conversions
Data Source
AI summary
An information processing apparatus includes a control unit. The control unit calculates an RGB value output by an imaging apparatus when imaging of a predetermined color is performed by using the imaging apparatus by using characteristic data related to a spectroscopic sensitivity characteristic of the imaging apparatus, photographing-side spectroscopic data, and color spectroscopic data. The control unit acquires display-side spectroscopic data related to a spectroscopic distribution characteristic of a light source in a display environment in which imaged data imaged by the imaging apparatus is displayed on a display apparatus. The control unit calculates an XYZ value when the predetermined color is displayed on the display apparatus by using the display-side spectroscopic data and the color spectroscopic data. The control unit calculates conversion information for converting the RGB value into the XYZ value.