US 10,948,283 B1Granted

Tileable structured light projection system

AssigneeFacebook Technologies, LLC

InventorsMark Timothy Sullivan, Andrew Matthew Bardagjy, Joseph Duggan, Fei Liu, Simon Morris Shand Weiss

Life of this patent

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Abstract

A head-mounted display (HMD) system includes a projector system configured to emit a structured light (SL) pattern onto one or more objects in a local area, the projected SL pattern comprises at least a first SL pattern having a first field of view (FOV) corresponding to a first tileable boundary, and a second SL pattern having a second FOV corresponding to a second tileable boundary. Each of the projected SL patterns contains fiducials at predetermined locations within the SL pattern. An imaging device captures images of the local area including at least portions of the first SL pattern or the second SL patterns. The detected locations of the fiducials in the captured images is used to determine the boundary locations of the first and second SL patterns. Depth information of the local area is generated based upon the determined locations of the first and second SL patterns.

Claims20

Dependent claims

A projector system, comprising:

an illumination source that emits source light;
a projector assembly configured to diffract a first portion of the source light to form a first structured light (SL) pattern having a first tileable boundary, the first structured light pattern including a first set of fiducials, and to diffract a second portion of the source light to form a second SL pattern having a second tileable boundary, the second structured light pattern including a second set of fiducials;
wherein the projector assembly is configured to project the first structured light pattern and the second structured light pattern into a local area such that the first tileable boundary and the second tileable boundary tessellate with each other, and wherein a controller identifies locations of the first tileable boundary and the second tileable boundary using the first set of fiducials and the second set of fiducials, respectively, and uses a remaining portion of the first SL pattern and the second SL pattern in the image, which is identified based upon the determined locations of the first tileable boundary and the second tileable boundary, to determine a depth of the object.

Dependencies are inferred from the claim text.

Facts

Application: 16/808,190Filed 3 Mar 2020 · continuation
Priority: 31 Oct 2017
Granted: 16 Mar 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

G01B 11/22
Measuring arrangements characterised by the use of optical techniques: for measuring depth
G01B 11/028
For measuring length, width or thickness: by measuring lateral position of a boundary of the object
G01B 11/2513
By projecting a pattern, e.g. one or more lines, moiré fringes on the object: with several lines being projected in more than one direction, e.g.…
G02B 27/0101
Head-up displays: characterised by optical features