Display System Gradation Converter JND Consistency
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Solution Overview
Problem
Display systems face a reduction in image visibility when the gradation characteristic is changed, particularly in medical diagnostic images, due to inconsistent just-noticeable difference (JND) correspondence values across gradation values.
Innovation Solution
A display system with a gradation characteristic converter that shifts or changes the JND correspondence values to maintain constant differences between gradation values, allowing for adjustable luminance adjustments while preserving natural visibility, by shifting the gradation characteristic towards low or high values and altering differences between JND values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gradation characteristic is changed to adjust luminance, then the adaptability to different observation conditions is improved, but the visibility of the image is reduced
Solution Approach 1:
The patent changes the parameter of JND correspondence values in the gradation characteristic conversion process. Specifically, it adjusts the differences between JND correspondence values corresponding to each gradation value to be constant, while allowing the absolute JND correspondence values to vary. This enables luminance adaptation to different observation conditions while preserving image visibility through controlled parameter modification.
2Adaptability or versatility
If the luminance is increased or reduced to adapt to environment, then the adaptability is improved, but the natural visibility may be compromised
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different gradation values. It maintains constant differences between JND correspondence values for each gradation level, allowing localized adjustment of luminance perception while preserving the natural visibility characteristics of the image across different brightness regions.
Data Source
AI summary
The purpose of the present invention is to provide a display system capable of preventing a change in gradation characteristics from reducing the visibility of an image. The present invention provides a display system that includes a display unit and a display control unit, wherein: the display control unit includes a gradation characteristic converter; the gradation characteristic converter converts first gradation characteristics to second gradation characteristics; the first gradation characteristics maintain a constant level of the difference in the JND correspondence value between each gradation value; the gradation characteristic converter performs the conversion to maintain a constant level of the difference in JND correspondence value between each gradation value which is controlled by the second gradation characteristics; and the display unit displays input image data as an image at a luminance corresponding to the second gradation characteristics.