HDR to SDR Image Converter for Print Quality
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Solution Overview
Problem
Current image processing technologies face challenges in generating high-quality still image data for printing, particularly in converting High Dynamic Range (HDR) images to Standard Dynamic Range (SDR) formats suitable for printing, resulting in issues with blown-out highlights and crushed shadows.
Innovation Solution
An image processing device and method that acquire HDR still image data and convert it into SDR still image data based on printing performance and paper type, using a converter to adjust the dynamic range for optimal printing quality, ensuring the highest brightness range is compatible with the paper's reflection brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If HDR still image data is directly used for printing, then the dynamic range is preserved, but the print quality deteriorates due to blown-out highlights and crushed shadows
Solution Approach 1:
The patent applies parameter changes by converting HDR image data to SDR format and adjusting the brightness range to match paper reflection characteristics. The conversion process modifies the luminance parameters from HDR's wide brightness range to SDR's limited range, while applying tone mapping and brightness adjustment parameters to prevent blown-out highlights and crushed shadows, thereby achieving both dynamic range management and print quality improvement
2Manufacturing precision
If the brightness range is reduced to match paper reflection, then print quality improves, but the dynamic range information is lost
Solution Approach 1:
The patent applies preliminary action by performing brightness range adjustment and tone mapping before the actual printing process. The system pre-processes the HDR image data by converting it to SDR format and adjusting brightness parameters to match paper reflection characteristics, ensuring optimal print quality from the outset while preserving essential image information through careful parameter management
3Adaptability or versatility
If HDR to SDR conversion is performed, then compatibility with printing devices is improved, but image detail in extreme brightness areas is degraded
Solution Approach 1:
The patent applies the intermediary principle by introducing tone mapping and brightness adjustment processes as intermediate steps between HDR and SDR conversion. These intermediary processing stages preserve image details in extreme brightness areas by applying gradual tone transitions and preventing abrupt clipping, thereby maintaining image quality while achieving device compatibility
Data Source
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AI summary
The present disclosure provides an image processing device that provides still image data for printing high-quality printed matter. The image processing device includes an acquisition section configured to acquire first still image data obtained through imaging and having a brightness range defined in a first dynamic range and performance information indicating a printing performance of a printing device, a converter configured to convert the first still image data acquired by the acquisition section into second still image data defined in a second dynamic range having a smaller brightness range than the brightness range of the first dynamic range depending on the printing performance indicated by the performance information acquired by the acquisition section, and an output section configured to output the second still image data converted by the converter to the printing device.