Harvard College

Meta Platforms Technologies, LLC

Qi Guo

Federico Capasso

Yao-Wei Huang

Zhujun Shi

Todd Zickler

Emma Alexander

Steven John Lovegrove

Huixuan Tang

Hauke Malte Strasdat

Disclosed is a depth sensor for determining depth. The depth sensor can include a photosensor, a metalens configured to manipulate light to simultaneously produce at least two images having different focal distances on a surface of the photosensor, and processing circuitry configured to receive, from the photosensor, a measurement of the at least two images having different focal distances. The depth sensor can determine, according to the measurement, a depth associated with at least one feature in the at least two images.

Compact metalens depth sensors

Raycast-based calibration techniques are described for determining calibration parameters associated with components of a head mounted display (HMD) of an augmented reality (AR) system having one or more off-axis reflective combiners. In an example, a system comprises an image capture device and a processor executing a calibration engine. The calibration engine is configured to determine correspondences between target points and camera pixels based on images of the target acquired through an optical system, the optical system including optical surfaces and an optical combiner. Each optical surface is defined by a difference of optical index on opposing sides of the surface. At least one calibration parameter for the optical system is determined by mapping rays from each camera pixel to each target point via raytracing through the optical system, the raytracing being based on the index differences, shapes, and positions of the optical surfaces relative to the one or more cameras.

Raycast calibration for artificial reality head-mounted displays

Growing community of inventors

Cambridge, MA, United States of America

Qi Guo