Color Correspondence Generation Without Physical Charts
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Solution Overview
Problem
Existing color management techniques require a designated chart for image capture and often depend on the ambient light source or imaging device characteristics, necessitating specialized equipment for accurate color representation.
Innovation Solution
A color correspondence information generating system that recognizes objects in images and generates color correspondence information without needing a designated chart or special measuring devices, using a database of object recognition information and color characteristic data to adjust pixel values for accurate color representation under any light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a designated chart is used for color management, then color accuracy is improved, but user convenience deteriorates due to the need to acquire and use special equipment
Solution Approach 1:
The patent replaces the physical designated chart with a digital reference chart that can be displayed on any display device. The system captures an image of the reference chart as it appears on the display device under the current lighting conditions, and uses this captured image as the basis for color correction. This eliminates the need for users to acquire special physical equipment while maintaining color accuracy.
Solution Approach 2:
The system uses the display device itself and the ambient lighting conditions to generate the reference chart image. By capturing how the reference chart appears on the display under the current lighting, the system creates a self-contained reference that adapts to the environment without requiring external specialized equipment.
2Measurement precision
If spectral energy distribution measurement is used for color correction, then color representation accuracy is improved, but device complexity increases due to the need for special measuring devices
Solution Approach 1:
The patent replaces complex spectral measurement devices with a standard image capturing device (camera or smartphone). Instead of measuring spectral energy distribution directly, the system captures an image of the reference chart under the ambient light and uses image processing to derive color correction information. This substitutes sophisticated optical measurement equipment with a common imaging device.
Solution Approach 2:
The reference chart image displayed on the screen acts as an intermediary between the lighting conditions and the color correction process. Rather than directly measuring the spectral properties of the light source, the system uses the reference chart as a mediator that encodes the lighting information in a form that can be captured and processed by standard imaging devices.
3Adaptability or versatility
If ambient light dependent color correction is used, then adaptability to different lighting conditions is improved, but color consistency deteriorates due to variations in lighting environments
Solution Approach 1:
The system captures an image of the reference chart under the current ambient lighting conditions and uses this captured image as feedback to generate appropriate color correction parameters. By continuously adapting to the actual lighting conditions present during image capture, the system maintains color consistency relative to those specific conditions while remaining adaptable to different environments.
Solution Approach 2:
The system dynamically adjusts color correction parameters based on the captured reference chart image. By changing the correction parameters according to the actual lighting conditions observed in the captured image, the system achieves both adaptability to different lighting environments and consistency within each specific lighting condition.
Data Source
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AI summary
The present invention is a color correspondence information generating system which generates color correspondence information indicating a correspondence relation between color information and color characteristic information using a first image obtained by capturing first objects under an environment of a light source. The color characteristic information indicating a characteristic of color represented by the color information, the system includes an object database that stores therein correspondences between recognition information which recognize the respective first objects and the color characteristic information about the first objects recognized by the recognition information; an object recognition section that recognizes the first objects in the first image from the first image and the recognition information, and outputs image regions of the first objects in the first image and first color characteristic information, the first color characteristic information being the color characteristic information corresponding to the first objects; and a color correspondence information generation section that generates the color correspondence information which is a correspondence relation between the color information and the color characteristic information, using the color information and the first color characteristic information of pixels in the image regions. The color characteristic information and the recognition information have a one-to-one correspondence relation with each other, or the color characteristic information being the recognition information itself.