Image Processing Apparatus Illumination Derivation
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Solution Overview
Problem
Conventional image processing technologies fail to accurately reproduce the brightness of a print product when viewed in environments different from the original illumination conditions, leading to undesirable color appearance.
Innovation Solution
An image processing apparatus that determines and adjusts the illumination condition to irradiate the print product with higher illuminance than normal, based on exposure condition information from the image data captured, to reproduce the original brightness of the photographed state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image processing is performed based on predetermined illumination conditions (e.g., 80 cd/m2, 5000K), then the print product can be viewed with consistent color under normal illumination, but the brightness and color appearance deviate from the original captured image when viewed in different illumination environments
Solution Approach 1:
The patent changes the illumination parameter from a fixed predetermined value (80 cd/m2) to a variable value derived from exposure condition information. By calculating the actual illumination condition at the time of image capture and using this as the basis for image processing, the system adapts the processing parameters to match the original capture environment, thereby improving brightness reproduction accuracy while maintaining color consistency
Solution Approach 2:
The patent performs preliminary acquisition of exposure condition information (such as illuminance data from sensors or metadata from capture devices) before executing the image processing. This preliminary action allows the system to pre-determine the appropriate illumination condition parameters, ensuring that the subsequent image processing is based on accurate original capture conditions rather than generic assumptions
2Ease of manufacture
If the print product is designed for a fixed color gamut (e.g., sRGB at 80 cd/m2), then the color output is standardized and predictable, but it cannot accurately reproduce the brightness of the original captured image in different viewing environments
Solution Approach 1:
The patent introduces dynamics into the previously static color gamut mapping process by making the target white point and illumination parameters variable. Instead of always targeting sRGB at 80 cd/m2, the system dynamically adjusts the target color space parameters based on the original capture illumination conditions, allowing the same manufacturing process to adapt to different viewing environments while maintaining standardization through automated parameter selection
3Productivity
If conventional image processing assumes normal illumination (80 cd/m2, 5000K), then the processing is simple and fast, but it fails to reproduce the original brightness when the actual illumination differs from the assumed environment
Solution Approach 1:
The patent performs preliminary acquisition and processing of exposure condition information to determine the actual illumination parameters before the main image processing step. By having this information ready in advance, the system can quickly adjust processing parameters without adding significant computational overhead, thus maintaining high productivity while achieving accurate brightness reproduction through environment-aware processing
Data Source
AI summary
An illumination condition, which is used to irradiate a print product with light having illuminance higher than normal illumination, is derived based on exposure condition information at the time of photographing.