Preview Image Luminance Compression for Display Compatibility
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Solution Overview
Problem
Existing image processing systems fail to appropriately display preview images of illuminated prints, as they do not consider the maximum luminance capabilities of the image display apparatus, leading to loss of gradation in high luminance regions when the input luminance exceeds the display's output capabilities.
Innovation Solution
An image processing apparatus that acquires both the maximum luminance values of the print product under auxiliary lighting and the image display apparatus, generates preview image data by converting the input data to ensure the maximum luminance of the preview image does not exceed the display's capabilities, thereby maintaining gradation in high luminance regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the preview image data is generated without considering the maximum luminance of the image display apparatus, then the luminance dynamic range of the illuminated image is preserved, but the gradation in high luminance regions is lost and the preview image cannot be appropriately expressed
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the luminance values in the preview image data based on the maximum luminance capability of the image display apparatus. When the calculated luminance exceeds the display's maximum, the patent transforms the luminance parameter to fit within the displayable range while preserving gradation information through proportional scaling or tone mapping operations.
2Manufacturing precision
If the maximum luminance value of the preview image data is limited to match the image display apparatus capabilities, then the gradation in high luminance regions is maintained, but the luminance dynamic range of the illuminated image is compressed
Solution Approach 1:
The patent applies partial action by selectively adjusting only the luminance values that exceed the display's maximum capability, while leaving lower luminance values unchanged. This partial transformation preserves the luminance dynamic range for displayable portions of the image while correcting only the problematic high luminance regions that would otherwise lose gradation.
3Measurement precision
If auxiliary lighting is used to illuminate the print product, then the luminance dynamic range of the printed image is widened, but the preview image cannot be appropriately displayed when the luminance exceeds the display apparatus capabilities
Solution Approach 1:
The patent applies preliminary action by calculating the maximum luminance of the illuminated print product before generating the preview image data. Based on this pre-calculated value, the patent proactively adjusts the luminance parameters to ensure compatibility with the image display apparatus, preventing display issues before they occur.
Data Source
AI summary
Luminance data indicating luminance of the print product illuminated by the lighting is calculated and processing for causing a high luminance region to have gradation characteristics is performed.