Display Luminance Adjustment via GSDF Lookup Table
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Solution Overview
Problem
Medical display devices require precise adjustment of grayscale level luminance to ensure integrity and consistency across different locations and environments, which is challenging with existing methods that are not quick or accurate enough to meet standards like the DICOM standard.
Innovation Solution
A method and apparatus for adjusting the luminance of display devices by determining a grayscale level interval based on maximum and minimum luminance values, setting target luminance values for each grayscale level, and adjusting the luminance accordingly to match a predefined standard such as the GSDF, ensuring consistency and integrity across different use scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing luminance adjustment methods are used, then the adjustment process is simple, but the adjustment speed is slow and accuracy is insufficient to meet DICOM standard requirements
Solution Approach 1:
The patent pre-calculates and stores a lookup table containing luminance values for each grayscale level according to the GSDF curve before actual use. During adjustment, the system directly queries this pre-computed table rather than calculating in real-time, which significantly reduces adjustment time while maintaining high accuracy according to DICOM standards
Solution Approach 2:
The patent transforms the continuous GSDF curve into discrete grayscale levels with specific luminance values. By converting the theoretical curve into practical discrete parameters (grayscale level to luminance value mappings), the system achieves both measurement precision required by standards and operational efficiency through direct parameter lookup
2Reliability
If grayscale level luminance is adjusted to meet DICOM standard, then integrity and consistency are improved, but the complexity of the adjustment process increases
Solution Approach 1:
The patent creates a simplified copy of the complex GSDF curve in the form of a lookup table. Instead of implementing the entire complex curve calculation and adjustment process, the system copies the essential luminance values from the GSDF standard into a pre-computed table, reducing adjustment process complexity while maintaining display consistency and reliability
Solution Approach 2:
The patent segments the continuous GSDF curve into discrete grayscale levels (typically 256 levels for 8-bit displays). Each segment corresponds to a specific grayscale level with a predetermined luminance value from the lookup table. This segmentation simplifies the adjustment process by breaking down the complex continuous curve into manageable discrete steps
Data Source
AI summary
The present disclosure provides a method and an apparatus for adjusting luminance of a display device. The method of adjusting luminance of the display device includes: determining a gray scale level interval on a target gray scale curve based on a maximum luminance value and a minimum luminance value to be set; determining a target luminance value for each grayscale level of the display device on the target gray scale curve according to the gray scale level interval; and adjusting luminance of the grayscale level of the display device based on the determined target luminance value.