Camera calibration verification using hand imaging and product packaging
AssigneeGoogle Inc.
InventorsNarges Noori, Zhiheng Jia, Zhaowei Wang, Dao Zhou
Life of this patent
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Abstract
Techniques are directed to identifying focus points of a body part of a user as alignment features for calibration verification. In some implementations, a body part of the user may be a hand, and the focus points are joints. A calibration verification involves, in some implementations, capturing an image of a user's hand and detecting the joints of the hand. The calibration verification then involves, in such implementations, determining distances between joints and computing a metric based on the distances. This metric is then compared to a ground truth metric and the calibration is evaluated based on the verification.
Claims21
A method, comprising:
- computing a ground truth distance by capturing an image of an object having a predetermined size with a camera, the predetermined size being used to determine a scale of a body part;
- verifying a calibration of the camera of a wearable device worn by a user by:
- detecting a first focus point of the body part of the user and a second focus point of the body part using the camera;
- determining a first distance between the first focus point and the second focus point;
- and
- producing a verification of the scale by comparing the first distance with the ground truth distance;
- and
- in response to the verification of the scale indicating an error in the calibration of the camera, correcting the error by adjusting the camera.
A computer program product comprising a nontransitory storage medium, the computer program product including code that, when executed by a processor, causes the processor to perform a method, the method comprising:
- computing a ground truth distance by capturing an image of an object having a predetermined size with a camera, the predetermined size being used to determine a scale of a body part;
- verifying a calibration of the camera of a wearable device worn by a user by:
- detecting a first focus point of the body part of the user and a second focus point of the body part using the camera;
- determining a first distance between the first focus point and the second focus point;
- and
- producing a verification of the scale by comparing the first distance with the ground truth distance;
- and
- in response to the verification of the scale indicating an error in the calibration of the camera, correcting the error by adjusting the camera.
An apparatus, comprising:
- a memory;
- and
- a processor coupled to the memory, the processor being configured to:
- compute a ground truth distance by capturing an image of an object having a predetermined size with a camera, the predetermined size being used to determine a scale of a body part;
- verify a calibration of the camera of a wearable device worn by a user by:
- detecting a first focus point of the body part of the user and a second focus point of the body part using the camera;
- determining a first distance between the first focus point and the second focus point;
- and
- producing a verification of the scale by comparing the first distance with the ground truth distance;
- and
- in response to the verification of the scale indicating an error in the calibration of the camera, correct the error by adjusting the camera.
Dependencies are inferred from the claim text.