A method for evaluating luminance non-uniformity of displays by use of a commercially available digital camera

Kawamoto, Keishin; Tokurei, Shogo; Morishita, Junji

doi:10.1007/s12194-017-0412-7

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Another important aspect is how to evaluate and optimise display performance. Authors have investigated factors that may affect the performance of these displays, including luminance inhomogeneity, viewing angle, resolution, magnification, and window settings (Kawamoto et al, 2017). Others (Hatanaka et al, 2009) have investigated the effect of viewing angle on observer performance and compared the performance of different types of displays.…”

Section: Related Workmentioning

confidence: 99%

Impact of 222 Nm Uv-C Radiation on Color Accuracy of Video Displays in Public Buses

Kurmis*,

Drungilas,

Tadzijevas

et al. 2023

Materials, Methods & Technologies

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The purpose of this study is to investigate the effects of 222 nm UV-C radiation on the color accuracy of bus interior materials, specifically video displays. The research examines the effects of exposing bus interior displays to UV-C radiation and measuring the resulting changes in monitor color accuracy over time. This wavelength of UV-C radiation is commonly used for disinfection purposes and can be used against COVID-19. The results show that UV-C radiation has a significant negative effect on display color and other parameters. The results may be useful in ensuring optimal color accuracy and durability under UV-C exposure, while providing a safe and effective method of disinfection against COVID-19.

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Section: Related Workmentioning

confidence: 99%

Impact of 222 Nm Uv-C Radiation on Color Accuracy of Video Displays in Public Buses

Kurmis*,

Drungilas,

Tadzijevas

et al. 2023

Materials, Methods & Technologies

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A high-speed OLED monitor for precise stimulation in vision, eye-tracking, and EEG research

Dimigen,

Stein

2024

Preprint

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The recent introduction of organic light-emitting diode (OLED) monitors with refresh rates of 240 Hz or more opens new possibilities for their use as precise stimulation devices in vision research, experimental psychology, and electrophysiology. These affordable high-speed monitors, targeted at video gamers, promise several advantages over the cathode ray tube (CRT) and liquid crystal display (LCD) monitors commonly used in these fields. Unlike LCDs, OLED displays have self-emitting pixels that can show true black, resulting in superior contrast ratios, a broad color gamut, and good viewing angles. More importantly, the latest gaming OLEDs promise excellent timing properties with minimal input lags and rapid transition times. However, OLED technology also has potential drawbacks, notably Auto-Brightness Limiting (ABL) behavior, where the local luminance of a stimulus can change with the number of currently illuminated pixels. This study characterized a 240 Hz OLED monitor, the ASUS PG27AQDM, in terms of its timing properties, spatial uniformity, viewing angles, warm-up times, and ABL behavior. We also compared its responses to those of CRTs and LCDs. Results confirm the monitor’s excellent temporal properties with CRT-like transition times (around 0.3 ms), wide viewing angles, and decent spatial uniformity. Additionally, we found that ABL could be prevented with appropriate settings. We illustrate the monitor’s benefits in two time-critical paradigms: Rapid “invisible” flicker stimulation and the gaze-contingent presentation of stimuli during eye movements. Ourfindings suggest that the newest gaming OLEDs are precise and cost-effective stimulation devices for visual experiments that have several key advantages over CRTs and LCDs.

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Assessment Tool of Image Quality for Medical Liquid-crystal Displays Using Commercially Available Digital Cameras

Tokurei

Ogaki²,

Bamba³

et al. 2019

Nippon Hoshasen Gijutsu Gakkai Zasshi

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We developed a simplified tool for measuring image quality of medical liquid-crystal displays (LCDs) using a commercially available color digital camera. This tool implemented as a plug-in software for ImageJ (open-source image processing program) was designed to compute modulation transfer functions (MTFs) and Wiener spectra (WS) of monochrome and color LCDs from LCD photographed images captured by a camera. The intensities of the red (R), green (G), and blue (B) signals of the unprocessed image data depend on the spectral sensitivity of the image sensor used in the camera. In order to evaluate image quality based on LCD luminance, the plug-in software calibrates the RGB signals from the camera using measured luminance of the LCD and converts them into grayscale signals that correspond to the luminance of the LCD. The MTFs and WS are determined based on the line response from a one-pixel line image and the one-dimensional noise profiles acquired by scanning the uniform image using numerically synthesized slit, respectively. With this plug-in software for ImageJ, we are able to readily compute MTFs and WS of both monochrome and color LCDs from unprocessed image data of cameras. Our simplified tool is helpful to evaluate and understand the physical performance of LCDs for a large number of display users in hospitals and medical centers.

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A method for evaluating luminance non-uniformity of displays by use of a commercially available digital camera

Cited by 3 publications

References 13 publications

Impact of 222 Nm Uv-C Radiation on Color Accuracy of Video Displays in Public Buses

Impact of 222 Nm Uv-C Radiation on Color Accuracy of Video Displays in Public Buses

A high-speed OLED monitor for precise stimulation in vision, eye-tracking, and EEG research

Assessment Tool of Image Quality for Medical Liquid-crystal Displays Using Commercially Available Digital Cameras

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