Printed Image Information Extraction With Pre-Set White Balance
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Solution Overview
Problem
Existing methods struggle to accurately extract additional information embedded in printed images due to changes in color caused by auto white balance adjustments in image capturing, leading to incomplete or incorrect extraction of the embedded data.
Innovation Solution
An information processing apparatus and method that adjusts the white balance based on a predetermined adjustment value associated with the embedded image, rather than relying on auto white balance functions, and optionally uses controlled illumination to stabilize the capturing environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If auto white balance adjustment function is used to adapt to different capturing environments, then adaptability is improved, but measurement precision deteriorates due to color changes in the captured image
Solution Approach 1:
The patent applies preliminary action by pre-setting the white balance adjustment value based on the light source color temperature before capturing the printed image. This prevents color changes during capture, ensuring that the additional information embedded by color modulation remains accurate and can be extracted correctly without being affected by auto white balance adjustments.
2Adaptability or versatility
If white balance is adjusted based on capturing environment, then adaptability is improved, but manufacturing precision deteriorates due to color changes in the printed image
Solution Approach 1:
The system performs preliminary determination of the light source color temperature and pre-adjusts the white balance before capturing the printed image. This ensures that the color modulation used to embed additional information is not distorted by environmental lighting conditions, maintaining manufacturing precision while adapting to different light sources.
3Loss of information
If color modulation is used to embed additional information, then information capacity is improved, but reliability deteriorates due to sensitivity to color changes
Solution Approach 1:
The patent applies preliminary action by pre-determining the light source color temperature and pre-adjusting the white balance before capturing the printed image. This ensures that the color modulation used to embed additional information is not distorted by environmental lighting conditions, maintaining manufacturing precision while adapting to different light sources.
Solution Approach 2:
The system changes the parameter of white balance adjustment value based on the determined light source color temperature. By dynamically adjusting this parameter to match the capturing conditions, the system ensures accurate color representation and reliable extraction of additionally embedded information.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures accurate extraction of additional information by stabilizing the white balance during image capture, reducing color changes and enhancing the reliability of information retrieval from printed images.
Implementation Method 1
a light source configured to illuminate the image captured by the image capturing unit
Data Source
AI summary
An image capturing unit captures an image including an embedded image that is printed on the basis of image data in which at least a color component has been modulated according to additional information. An adjustment unit adjusts a white balance of the image captured by the image capturing unit on the basis of an adjustment value associated with the embedded image. A processing unit processes image data of the image captured by the image capturing unit whose white balance has been adjusted by the adjustment unit to read the additional information in the image captured by the image capturing unit.