US 9,807,383 B2Granted

Wearable video headset and method for calibration

AssigneeDaqri, LLC

InventorsSterling Crispin, Mark Anthony Sararu

Life of this patent

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Abstract

During calibration, a wearable video headset displays a pattern on a partially transparent display positioned in a field of view of a user's eye. The user has a hand-held marker that includes a scaled version of the displayed pattern. The user moves the marker toward or away from the user's eye until the pattern on the marker appears to be the same size as the pattern on the display. When the sizes match, the headset measures a distance between a forward-facing camera and the hand-held marker. The headset uses the measured distance, and geometrical relationships, to determine the spacing between the user's eye and the display. Such calibration can ensure that the images displayed to the user mesh realistically with the surroundings, which remain partially visible through the partially transparent display of the video headset.

Claims16

Dependent claims

A method for calibrating a video headset worn on a head of a user, the method comprising:

displaying a pattern on a display of the video headset, the display being at least partially transparent and positioned in a field of view of an eye of the user;
determining that a marker including a scaled version of the pattern is positioned in the field of view of the eye at a first longitudinal position away from the video headset, such that when the marker is positioned at the first longitudinal position, the pattern on the marker appears to be the same size as the pattern on the display in the field of view of the eye;
when the marker is positioned at the first longitudinal position, measuring a distance between a forward-facing camera on the video headset and the marker;
and
calculating, with a processor, a spacing between the eye and the display, based in part on the measured distance;
wherein calculating the spacing between the eye and the display comprises:
receiving the measured distance between the forward-facing camera and the marker;
and
calculating, with the processor, the spacing between the eye and the display, based in part on the received measured distance, and using an expression based on a linear increase of the field of view of the eye, as a function of longitudinal distance, from a fovea of the eye;
wherein:
the expression comprises
ID
=
(
DC
+
CM
)
⁢
(
1
XMARK
XDISP
-
1
)
-
FI
;
FI is a longitudinal spacing between the fovea of the eye and an iris of the eye;
ID is a longitudinal spacing between the iris of the eye and the display;
DC is a longitudinal spacing between the display and the forward-facing camera;
CM is the received measured distance, corresponding to a measured longitudinal spacing between the forward-facing camera and the marker when the pattern on the marker appears to be the same size as the pattern on the display in the field of view of the eye;
XMARK is a relative size of the pattern on the marker along one lateral dimension;
and
XDISP is a relative size of the pattern on the display along the same lateral dimension.

33 more elements

A video headset wearable on a head of a user, comprising:

a display being at least partially transparent and positioned in a field of view of an eye of the user;
a processor;
and
memory including instructions that, when executed on the processor, cause the processor to perform operations, the operations comprising:
displaying a pattern on the display;
determining that a marker including a scaled version of the pattern is positioned in the field of view of the eye at a first longitudinal position away from the video headset, such that when the marker is positioned at the first longitudinal position, the pattern on the marker appears to be the same size as the pattern on the display in the field of view of the eye;
when the marker is positioned at the first longitudinal position, measuring a distance between a forward-facing camera on the video headset and the marker;
and
calculating, with the processor, a spacing between the eye and the display, based in part on the measured distance;
wherein calculating the spacing between the eye and the display comprises:
receiving the measured distance between the forward-facing camera and the marker;
and
calculating, with the processor, the spacing between the eye and the display, based in part on the received measured distance, and using an expression based on a linear increase of the field of view of the eye, as a function of longitudinal distance, from a fovea of the eye;
wherein:
the expression comprises
ID
=
(
DC
+
CM
)
⁢
(
1
XMARK
XDISP
-
1
)
-
FI
;
FI is a longitudinal spacing between the fovea of the eye and an iris of the eye;
ID is a longitudinal spacing between the iris of the eye and the display;
DC is a longitudinal spacing between the display and the forward-facing camera;
CM is the received measured distance, corresponding to a measured longitudinal spacing between the forward-facing camera and the marker when the pattern on the marker appears to be the same size as the pattern on the display in the field of view of the eye;
XMARK is a relative size of the pattern on the marker along one lateral dimension;
and
XDISP is a relative size of the pattern on the display along the same lateral dimension.

37 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/085,084Filed 30 Mar 2016
Published: US 2017/0289535 A15 Oct 2017
Granted: 31 Oct 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04N 17/004
Diagnosis, testing or measuring for television systems or their details: for digital television systems
G02B 27/017
Head-up displays: head mounted
G02B 27/0179
Head-up displays: display position adjusting means not related to the information to be displayed
G02B 2027/0129
Characterised by optical features: comprising devices for correcting parallax