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Color Rendering in Medical Extended-Reality Applications.

Andrea Seung Kim¹, Wei-Chung Cheng¹, Ryan Beams¹

¹FDA, Silver Spring, Maryland, USA.

Journal of Digital Imaging

|November 18, 2020

Summary

This summary is machine-generated.

Color rendering in extended reality (XR) medical applications is inconsistent across platforms. This study quantifies color differences in Unity, finding default settings introduce significant deviations, while simpler configurations offer better consistency for medical visualizations.

Keywords:

Color transfer Graphics rendering Image quality Medical imaging Mixed reality Virtual reality

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Area of Science:

Medical Visualization
Extended Reality (XR)
Computer Graphics

Background:

Cross-platform development of medical applications for extended-reality (XR) head-mounted displays (HMDs) often utilizes game engines.
Standardization of color characterization in medical visualizations across different rendering models and platforms remains a challenge.
Inconsistent color representation can impact the accuracy and reliability of medical data presented in XR environments.

Purpose of the Study:

To examine the transfer of color properties through rendering pipelines in the Unity engine for XR medical applications.
To quantify color differences introduced by various rendering configurations and texture import settings.
To provide a basis for standardizing and optimizing color consistency in medical XR visualizations.

Main Methods:

Evaluated five rendering pipeline configurations in Unity using digital color patches and a tissue slide sample image.
Measured color differences using the CIE 1976 color difference (ΔE).
Assessed the impact of texture import settings on color properties using the TG18-QC test pattern.

Main Results:

Color differences (ΔE) ranged from 0 to 25.97 for digital color patches and 7.49 to 34.18 for the tissue sample.
Default Unity configurations resulted in the highest color differences across tested colors and images.
All nine investigated texture import settings showed differences in pixel values, indicating their impact on color fidelity.

Conclusions:

Significant variations in color transfer exist within the Unity engine, particularly with default rendering settings.
The 'Unlit Shader' configuration demonstrated greater color consistency compared to default settings.
Findings highlight the need for standardization and optimization of color rendering for reliable medical XR applications.