78‐3: The Optimized Condition for Display Sparkle Contrast Measurement of Anti‐Glare Cover Glass based on the Solid Understandings

Isshiki, Masanobu; Inouye, A.; Tamada, Minoru; Kobayashi, Yusuke

doi:10.1002/sdtp.13127

Cited by 5 publications

(17 citation statements)

References 6 publications

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“…The inconsistency at 0.9° marks the position where the distance was changed. Apart from this small outlier, the shape of this curve is similar to that shown in Isshiki et al 12 …”

Section: Considerations During Sparkle Measurementssupporting

confidence: 84%

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Sparkle measurements for an automotive specification: Evaluation method for flexible setup conditions

Rotscholl¹,

Schlipf²,

Rickers

2022

J Soc Info Display

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This contribution proposes a sparkle evaluation based on a spatial frequency filter, taking into account various setup influences. Furthermore, the effect of flexible setup conditions on the reproducibility of measurement results is investigated. The procedure and concepts are derived for sampling resolutions between 15 and 30 cpx/mm with display pixel pitches between 183 and 224 ppi and validated by a round-robin experiment with different test devices, including glass and foil-based Anti-Glare Layers. The findings serve as a basis for the measurement conditions of an automotive display sparkle measurement specification.

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“…The inconsistency at 0.9° marks the position where the distance was changed. Apart from this small outlier, the shape of this curve is similar to that shown in Isshiki et al 12 …”

Section: Considerations During Sparkle Measurementssupporting

confidence: 84%

“…A simple experiment to measure the dependency of the sparkle on the angular aperture is to only change the ILMD aperture during measurement, as done in Isshiki et al 12 …”

Section: Considerations During Sparkle Measurementsmentioning

confidence: 99%

Sparkle measurements for an automotive specification: Evaluation method for flexible setup conditions

Rotscholl¹,

Schlipf²,

Rickers

2022

J Soc Info Display

View full text Add to dashboard Cite

show abstract

“…This is caused by the effect that an undetermined blur affects strong sparkle much more that low sparkle values. Earlier studies may have been affected by this effect [9].…”

Section: Enhancing Reproducibilitymentioning

confidence: 98%

“…The quantification of unwanted display sparkle, which arises due to the interaction of the pixel structure of information displays with Anti-Glare Layers (AGL) [1], has been the focus of several studies [1][2][3][4][5][6][7][8][9]. However, in many cases these studies focus only on the relative comparison of several glass samples, its correlation to human perception and repeatability.…”

Section: Introductionmentioning

confidence: 99%

24.3: Understanding and Achieving Reproducibility for the Evaluation of Display Sparkle Contrast

Rotscholl

Rasmussen²,

Rickers

et al. 2021

Symp Digest of Tech Papers

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The reproducible quantification of anti‐glare layer based display sparkle with Imaging Luminance Measurement Devices (ILMD) is essential for testing and conformity assessment of many displays aiming at outdoor applications. This study systematically researches relevant setup and system influences of a Fourier space‐based sparkle evaluation. These include 13 different antiglare layers, two displays with different PPI, and several different system setups featuring 12 different camera/lens combinations and more than 10000 individual luminance images. Based on the resulting sensitivities, the measurement procedure is optimized with respect to the achieved reproducibility. The resulting procedure serves as basis to define a new automotive specification for reproducible sparkle measurements and may do so for other applications, that need to quantify sparkle in a reproducible way.

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“…5,7 ), imaging conditions (focal length, Fnumber, etc. [8][9][10] ), and the pitch of the LMD detector array. 11 At the same time, there were several sources of "possible error" regarding the sparkle contrast measurement, such as focusing, low-frequency intensity variations, and the number of sampling points for the calculation of sparkle contrast.…”

Section: Introductionmentioning

confidence: 99%

Error analysis of sparkle contrast by applying image subtraction method

et al. 2022

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Measurement error of sparkle contrast was investigated by applying image subtraction method. The sparkle contrast was measured by changing the region of interest (ROI) and the imaging F‐number, while the measurement distance was fixed. The statistical error was dependent on the size of the ROI. It was suppressed when the ROI was over 100 × 100 LMD pixels under the condition which the intensity modulation of the image of the display matrix elements optically disappeared on the LMD sensor plane by choosing the specific combination of the effective F‐number of the imaging lens, the pitch of the display matrix element, and the optical magnification. The ratio of the intensity standard deviation of the subtracted image to that of the original image could be used as an error indicator of the statistical error by insufficient sampling points. It could also be used for analyzing the error caused by the low‐frequency intensity variations within the ROI. In case that the low‐frequency intensity variations were not eliminated from the measured sparkle pattern, the sparkle contrast kept changing with increasing the ROI. The error indicator was not converged to the certain value even if the size of the ROI was over 100 × 100 LMD pixels.

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78‐3: The Optimized Condition for Display Sparkle Contrast Measurement of Anti‐Glare Cover Glass based on the Solid Understandings

Cited by 5 publications

References 6 publications

Sparkle measurements for an automotive specification: Evaluation method for flexible setup conditions

Sparkle measurements for an automotive specification: Evaluation method for flexible setup conditions

24.3: Understanding and Achieving Reproducibility for the Evaluation of Display Sparkle Contrast

Error analysis of sparkle contrast by applying image subtraction method

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