US 12,183,039 B2Granted

Camera calibration

AssigneeMicrosoft Technology Licensing, LLC

InventorsHongli Deng, Duong Nguyen, Gabriel Blanco Saldana, Ryan S. Menezes

Life of this patent

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Abstract

The description relates to cameras, and camera calibration for enhancing user experiences. One example can receive a first image of a user at a first location relative to a camera. The first image can include the user's upper body but does not include the user from head to toe. The example can receive a second image of the user at a second location relative to a camera. The second image can include the user's upper body but does not include the user from head to toe. The example can estimate a distance of the second location from the first location relative to the camera and calibrate a height and tilt angle of the camera from the first image, the second image, and the estimated distance and without a full body image of the user.

Claims4

Dependent claims

A system, comprising:

a camera configured to be positioned to capture images of a user;
and,
a processor configured to:
identify a first horizontal distance from the camera to the user in a first image of the user that includes the user's upper body but not the user's whole body;
identify a second horizontal distance from the camera to the user in a second image of the user that includes the user's upper body but not the user's whole body;
estimate a distance and a direction separating the user in the first image and the second image;
determine a height of the camera, a tilt of the camera, and a focal length of the camera utilizing the first horizontal distance, the second horizontal distance, and the distance and direction;
and,
calibrate the camera based at least in part on the height of the camera, the tilt of the camera, and the focal length of the camera.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/717,354Filed 11 Apr 2022
Published: US 2023/0326076 A112 Oct 2023
Granted: 31 Dec 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G06T 7/80
Image analysis: analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
G06F 3/013
Arrangements for interaction with the human body, e.g. for user immersion in virtual reality: eye tracking input arrangements
G06F 3/017
Input arrangements or combined input and output arrangements for interaction between user and computer: gesture based interaction, e.g. based on a…
G06T 7/55
Depth or shape recovery: from multiple images

Family

US 2023/0326076 A1Pre-grant publication · published 12 Oct 2023
US 12,183,039 B2This patent

From the US filing history. Foreign family members aren’t listed.

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