Draft:Photon-to-Photon Latency

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Last edited by Keith D (talk | contribs) 23 days ago. (Update)

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Photon-to-Photon Latency (abbreviated as PTP Latency) is a metric used in the field of Extended Reality (XR) to measure the speed of a device's see-through capability. It is defined as the time required for an event in the real world to be displayed on the XR device's screen through see-through technology^[1]. Photon-to-Photon Latency is commonly used to evaluate the Video See-Through (VST) capability of XR devices.

Definition

The term refers to the time difference between the occurrence of a real-world event and its display on the XR device's screen:

$\Delta T=T1-T0$

where

T0 is the time point when the real-world event occurs.

T1 is the time point when the XR device, through video see-through technology, displays the event on the screen.

Photon-to-Photon Latency of Various XR Devices

Apple claims that the Photon-to-Photon Latency of its Apple Vision Pro is within 12 milliseconds^[2].

References

^ Xiao, Longyun; Jin, Wangzan; Wang, Qining; Zhao, Lei (April 2024). "46‐5: Photon‐to‐Photon Latency Test Solution to Video See‐Through of Mixed Reality Headset". SID Symposium Digest of Technical Papers. 55 (S1): 421–424. doi:10.1002/sdtp.17099. ISSN 0097-966X.
^ "Apple Vision Pro - Technical Specifications". Apple (China) - Official Website (in Chinese (China)). Retrieved 2024-08-19.

[1] Xiao, Longyun; Jin, Wangzan; Wang, Qining; Zhao, Lei (April 2024). "46‐5: Photon‐to‐Photon Latency Test Solution to Video See‐Through of Mixed Reality Headset". SID Symposium Digest of Technical Papers. 55 (S1): 421–424. doi:10.1002/sdtp.17099. ISSN 0097-966X.

[2] "Apple Vision Pro - Technical Specifications". Apple (China) - Official Website (in Chinese (China)). Retrieved 2024-08-19.

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