Display Calibration for Spatial and Off-Axis DICOM Conformance
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Solution Overview
Problem
Medical displays, particularly LCDs, face challenges in maintaining DICOM conformance due to viewing angle variations and luminance non-uniformity, leading to poor image quality and diagnostic accuracy.
Innovation Solution
A method and system that corrects non-conformance in greyscale or color values of pixel zones by storing characterization data and adjusting drive signals based on viewing angles and environmental parameters, ensuring compliance with DICOM standards while warning users of unacceptable viewing angles or conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single global calibration function is used for the entire display, then the device complexity is reduced, but the spatial uniformity and off-axis conformance deteriorate
Solution Approach 1:
The display is divided into multiple zones (e.g., center zone, corner zones, edge zones) with each zone having its own calibration function. This segmentation allows different regions to be calibrated independently to account for spatial variations in luminance and viewing angle characteristics, resolving the contradiction between simplicity and spatial uniformity.
Solution Approach 2:
Different calibration functions are applied to different spatial zones of the display. Each zone receives a customized calibration function that accounts for its specific viewing angle and luminance characteristics, ensuring local optimization of display quality while maintaining overall system functionality.
2Manufacturing precision
If the display is calibrated for on-axis viewing, then the on-axis conformance is improved, but the off-axis viewing quality deteriorates
Solution Approach 1:
The calibration system dynamically selects or adjusts calibration functions based on the detected viewing angle. When a user views the display from an off-axis position, the system applies the appropriate calibration function for that viewing angle, maintaining display quality across multiple viewing conditions rather than being fixed for on-axis only.
Solution Approach 2:
Different calibration functions with varying parameters are applied depending on the viewing angle. The calibration parameters are changed based on the detected viewing conditions, allowing the display to maintain conformance across different viewing angles by adjusting the calibration characteristics dynamically.
3Stability of the object's composition
If luminance uniformity is improved across the display area, then the spatial conformance is improved, but the contrast ratio and peak luminance are reduced
Solution Approach 1:
Instead of applying a single uniform luminance level across the entire display, each spatial zone is calibrated to achieve optimal luminance uniformity within that zone while preserving the overall contrast ratio and peak luminance characteristics of the display.
Solution Approach 2:
The calibration function adjusts luminance parameters locally for different zones and viewing angles, achieving luminance uniformity where needed while maintaining high contrast ratio and peak luminance through selective parameter optimization rather than uniform reduction.
4Adaptability or versatility
If the display system is corrected for multiple viewing angles, then the off-axis conformance is improved, but the device complexity increases
Solution Approach 1:
The calibration system is segmented into multiple discrete calibration functions corresponding to different viewing angle zones. This segmentation allows the complex multi-angle calibration to be managed as separate, manageable modules rather than a single complex system.
Solution Approach 2:
The calibration system is designed to be multi-functional, handling multiple viewing angles through a unified framework that selects appropriate calibration functions based on detected viewing conditions. This universal approach manages complexity by providing a single interface for multiple functions.
Data Source
AI summary
The invention describes a method for improving the spatial and off-axis conformance of display systems with respect to an enforced greyscale or color display standard. In the display systems, the native transfer curve is obtained for each pixel or zone of pixels, i.e. as a function of position on the display and as a function of viewing-angle. Once that information is available, an optimal conversion scheme from P-value to DDL can be created for each position on the display and this for all possible viewing-angles. In use, the conversion scheme is used to obtain an improved DICOM behavior. This optimization is also done with respect to the viewing-angle, based on a pre-set, selectable or measured viewing angle.