Dynamic Illumination Control for Wide Luminance Range Printing
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Solution Overview
Problem
Conventional image processing systems struggle to reproduce the wide luminance dynamic range of input image data, such as RAW data, when printing, as they are limited by the standard illumination conditions, leading to undesirable color and brightness changes under different observation environments.
Innovation Solution
An apparatus that determines the illumination condition for irradiating a printed product by acquiring luminance dynamic range information, exposure condition information, and recording medium characteristics, and adjusts the illumination using auxiliary lighting to expand the luminance range, allowing the printed product to accurately represent the original image data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard illumination conditions are used for printing, then the printed product can be produced with conventional equipment and processes, but the luminance dynamic range is insufficient to reproduce the original image data accurately
Solution Approach 1:
The patent changes the illumination parameter by introducing auxiliary lighting with controllable luminance to supplement standard illumination. This allows the total illumination luminance to be dynamically adjusted to match the luminance dynamic range of the input image data, thereby resolving the contradiction between conventional printing limitations and high-precision luminance reproduction requirements.
2Adaptability or versatility
If the printed product is observed under non-standard illumination environments, then the observation flexibility is improved, but the color and brightness deviate from the designed values
Solution Approach 1:
The patent performs preliminary color adjustment based on predicted observation environment illumination conditions before the actual observation occurs. By pre-compensating for the expected illumination deviations, the printed product maintains accurate color and brightness across different observation environments, resolving the contradiction between observation flexibility and color accuracy.
3Adaptability or versatility
If multiple lookup tables are prepared to handle different observation environments, then the adaptability to various environments is improved, but the device complexity increases
Solution Approach 1:
The patent replaces static multiple lookup tables with a dynamic color adjustment mechanism that predicts observation environment illumination and adjusts colors in real-time. This dynamic approach eliminates the need to pre-prepare and manage multiple lookup tables for different environments, reducing device complexity while maintaining environmental adaptability.
Data Source
AI summary
An apparatus is configured to determine an illumination condition for irradiating a printed product with light. The printed product is generated by outputting an image onto a recording medium based on fed input image data. The apparatus includes an input unit configured to receive inputs of luminance dynamic range information of the input image data and exposure condition information at the time of imaging regarding the input image data, an acquisition unit configured to acquire characteristic information of the recording medium, and a determination unit configured to determine the illumination condition based on the luminance dynamic range information, the exposure condition information, and the characteristic information.