Image Data Color Space Conversion for Digital Watermark Extraction
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Solution Overview
Problem
Conventional digital watermark techniques face issues with color modulation loss during color conversion, particularly when embedding additional information in images, which can lead to failure in extracting the embedded data due to differences between input and output color spaces, especially when the output color space has a narrower color reproduction range.
Innovation Solution
An information processing apparatus and method that converts image data into a color space specific to the output device, using a multiplex parameter to embed additional information in a way that prevents color modulation loss, ensuring the embedded data can be accurately extracted even after color conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If additional information is multiplexed on an image in the input color space by modulating color, then the additional information can be embedded in the image, but the color modulation may be lost during color conversion to the output color space, making extraction impossible
Solution Approach 1:
The patent performs color conversion from the input color space to the output color space before multiplexing the additional information. This preliminary action ensures that the color modulation is applied in the correct color space, preventing loss of modulation during subsequent color conversion and enabling reliable extraction of the embedded information.
2Ease of manufacture
If nonlinear color conversion is performed from input color space to output color space, then color reproduction is optimized for the output device, but color modulation embedded in the input color space is lost
Solution Approach 1:
The patent performs color conversion before multiplexing by converting the image from the input color space to the output color space in advance. This ensures that subsequent color modulations are applied in the correct color space, preventing loss of modulation during the nonlinear color conversion process while still allowing color reproduction optimization.
Data Source
AI summary
The first image data is converted into the second image data defined by a color space that depends on an output apparatus that outputs image data. Additional information is multiplexed on the converted second image data by using a multiplex parameter.