Qian Long, Song Tianyu, Unberath Mathias, Kazanzides Peter
IEEE Trans Vis Comput Graph. 2022 Jul;28(7):2550-2562. doi: 10.1109/TVCG.2020.3037284. Epub 2022 May 26.
Head-mounted loupes can increase the user's visual acuity to observe the details of an object. On the other hand, optical see-through head-mounted displays (OST-HMD) are able to provide virtual augmentations registered with real objects. In this article, we propose AR-Loupe, combining the advantages of loupes and OST-HMDs, to offer augmented reality in the user's magnified field-of-vision. Specifically, AR-Loupe integrates a commercial OST-HMD, Magic Leap One, and binocular Galilean magnifying loupes, with customized 3D-printed attachments. We model the combination of user's eye, screen of OST-HMD, and the optical loupe as a pinhole camera. The calibration of AR-Loupe involves interactive view segmentation and an adapted version of stereo single point active alignment method (Stereo-SPAAM). We conducted a two-phase multi-user study to evaluate AR-Loupe. The users were able to achieve sub-millimeter accuracy ( 0.82 mm) on average, which is significantly ( ) smaller compared to normal AR guidance ( 1.49 mm). The mean calibration time was 268.46 s. With the increased size of real objects through optical magnification and the registered augmentation, AR-Loupe can aid users in high-precision tasks with better visual acuity and higher accuracy.
头戴式放大镜可以提高用户的视敏度以观察物体细节。另一方面，光学透视头戴式显示器（OST-HMD）能够提供与真实物体配准的虚拟增强信息。在本文中，我们提出了AR-Loupe，它结合了放大镜和OST-HMD的优点，以在用户放大的视野中提供增强现实。具体而言，AR-Loupe集成了一款商用OST-HMD（Magic Leap One）和双目伽利略放大镜，并配有定制的3D打印附件。我们将用户眼睛、OST-HMD屏幕和光学放大镜的组合建模为针孔相机。AR-Loupe的校准涉及交互式视图分割和立体单点主动对齐方法（Stereo-SPAAM）的改进版本。我们进行了一项两阶段多用户研究来评估AR-Loupe。用户平均能够达到亚毫米级精度（0.82毫米），与普通AR引导（1.49毫米）相比显著更小。平均校准时间为268.46秒。通过光学放大增加真实物体的尺寸以及配准的增强信息，AR-Loupe可以帮助用户以更好的视敏度和更高的精度完成高精度任务。
