Head-mounted display luminance characterization for medical virtual reality

Dahal, Eshan; Eby, Noah; Lemaillet, Paul; Badano, Aldo

doi:10.1117/12.2613053

Cited by 4 publications

(2 citation statements)

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“…Specifically, optical aberrations and scattered light caused by thin lenses can lead to image artifacts such as image blur, veiling glare, and chromatic aberrations especially at the periphery of the field of view (FOV). [4][5][6][7][8] These image artifacts can degrade the peripheral image contrast and resolution, thus resulting in spatial variations of the image quality on VR headsets.…”

Section: Introductionmentioning

confidence: 99%

Radially variant contrast measurement in virtual reality headsets using circular concentric ring patterns

2023

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Image quality on virtual reality (VR) head‐mounted displays (HMDs) is radially variant on each eyepiece from the visual center (optical axis of the HMD) towards the periphery. The virtual image is blurred at the periphery of display field of view (FOV) resulting in contrast and resolution degradation. Conventional measurement methods adopted from flat‐panel display evaluation do not consider the spatially dependent image artifacts by additional optical components such as HMD lenses and thus may not be adequate to assess the VR image quality. We develop a new method using circular concentric ring patterns to measure the radially variant Michelson contrast on multiple VR HMDs. The results show that measured image contrast reduces towards the periphery of display FOV especially at high‐spatial frequencies. In addition, image quality on VR HMDs can be affected by the 3D position of the eye (or the camera) within the eyebox. Specifically, contrast is further degraded if the interpupillary distance (IPD) setting of the HMD does not match that of the user. It also varies with the entrance pupil location of the light‐measuring device. We propose an efficient method for image quality evaluation that can facilitate the regulatory evaluation of VR headsets.

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Section: Introductionmentioning

confidence: 99%

Radially variant contrast measurement in virtual reality headsets using circular concentric ring patterns

2023

Self Cite

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“…Immersive VR experience is realized on a head-mounted display (HMD) by magnifying the near-eye virtual image and adjusting the focal distance using optical lenses on top of a display backplane. However, optical aberrations and scattered light caused by thin lenses (e.g., Fresnel lenses) can result in image artifacts such as image blur, veiling glare, and chromatic aberrations especially at the periphery of display field of view (FOV) [4][5][6][7][8]. Because of the angularly symmetric nature of optical lenses, image quality on VR HMDs is radially variant, i.e., image quality varies along the radial orientation across the visual center.…”

Section: Introductionmentioning

confidence: 99%

82‐1: Distinguished Paper: Radially Variant Contrast in Virtual Reality Headsets

Zhao,

Beams,

Badano

2023

Symp Digest of Tech Papers

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Monocular image quality on virtual reality (VR) head‐mounted displays (HMDs) is radially variant on each eye piece. The virtual image is blurred at the periphery of display field of view primarily by thin lenses stacked on top of the VR display backplane, resulting in image resolution and contrast degradation. Conventional measurement methods adopted from flat‐panel display evaluation do not consider the spatially variant image artifacts by the additional optical components, and thus may not be adequate to assess the image quality in VR. We develop novel test patterns and a new method to measure the radially variant Michelson contrast on VR HMDs. The new method demonstrates efficient VR image quality evaluation using varied interpupillary distance settings.

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Spatially dependent veiling glare degrades image quality in medical extended reality

Zhao,

Beams,

Dahal

et al. 2024

Virtual Reality

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Spatially dependent veiling glare in medical extended reality (MXR) degrades image quality and needs to be characterized across technologies. Measurement methods of veiling glare on virtual and augmented reality (VR and AR) head-mounted displays (HMDs) have not been established in regulatory evaluation of MXR devices or display measurement standards. We describe an experimental bench setup enabling highly flexible translations and rotations of the light measuring device in five degrees of freedom within the eye box. Glare point spread functions (PSFs) of multiple VR and AR headsets are extracted and compared across the display field of view (FOV) in dark environment. At the center, the evaluated VR headsets (HTC VIVE Pro and VIVE Pro 2) demonstrate reduced long-range glare compared to the tested AR HMDs (Microsoft HoloLens 2 and Epson Moverio BT-300). The measured PSFs at multiple locations are spatially invariant for the HoloLens 2. However, veiling glare on the evaluated VR HMDs substantially increases toward the periphery of the FOV primarily due to optical aberration. For VR devices in medical use, increased peripheral glare can lead to image quality degradation and poor visualization of anatomical details.

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Head-mounted display luminance characterization for medical virtual reality

Cited by 4 publications

References 0 publications

Radially variant contrast measurement in virtual reality headsets using circular concentric ring patterns

Radially variant contrast measurement in virtual reality headsets using circular concentric ring patterns

82‐1: Distinguished Paper: Radially Variant Contrast in Virtual Reality Headsets

Spatially dependent veiling glare degrades image quality in medical extended reality

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