HEAD-UP DISPLAY CALIBRATION

1 - 15 . (canceled)

16 . A method for an end-user to perform in-situ calibration of the imagery of a head-up display in a vehicle, the method comprising:

receiving an instruction to enter a head-up display calibration mode; then, in response to receiving the instruction;

obtaining information on a real-world scene within a field of view of the head-up display from a vehicle sensor system of the vehicle;

using the information obtained from the vehicle sensor system to identify at least one feature in the field of view satisfying a suitability criterion for the head-up display calibration mode;

projecting an image using the head-up display, wherein the image comprises an image element corresponding to each feature; and

receiving at least one first user-input and changing the image in response to each first user-input.

17 . The method as claimed in claim 16 wherein changing the image comprises at least one selected from the group comprising: a translating, rotating, skewing or keystoning the image.

18 . The method as claimed in claim 16 wherein the at least one feature comprises a plurality of features each satisfying a suitability criterion.

19 . The method as claimed in claim 18 wherein a first feature of the plurality of features satisfies a first suitability criterion and a second feature of the plurality of features satisfies a second suitability criterion different to the first suitability criterion.

20 . The method as claimed in claim 16 wherein the suitability criterion relates to a physical property or parameter of the at least one feature such as shape or length.

21 . The method as claimed in claim 16 wherein satisfying the suitability criterion comprises having a straight line or edge with a minimum length; or having at least two straight sides.

22 . The method as claimed in claim 21 wherein satisfying the suitability criterion comprises a having a polygonal shape, a circular shape or an elliptical shape.

23 . The method as claimed in claim 21 wherein the polygonal shape is a triangular shape.

24 . The method as claimed in claim 16 further comprising identifying at least one feature outside of the field of view that satisfies a suitability criterion and providing an output for the end-user.

25 . The method as claimed in claim 24 wherein the output comprises an instruction to the end-user to reposition the vehicle.

26 . The method as claimed in claim 16 further comprising receiving a second user-input and, in response to the second user-input, determining a calibration function, wherein the calibration function corresponds to the total change to the image made in response to the at least one first user-input.

27 . The method as claimed in claim 16 wherein the step of projecting an image using the head-up display comprises:

determining an input image from the obtained information on the real-world scene;

determining a hologram of the input image; and

illuminating the hologram to form the image.

28 . The method as claimed in claim 16 wherein the information obtained on the real-world scene is a first image of the real-world scene.

29 . A head-up display having a calibration mode for an end-user to perform in-situ calibration of the imagery of the head-up display in a vehicle, wherein the head-up display is arranged to:

receive an instruction to enter a head-up display calibration mode, and in response to receiving the instruction;

obtain information on the real-world scene within a field of view from a vehicle sensor system of the vehicle;

identify at least one feature in the field of view that satisfies a suitability criterion using the information obtained from the vehicle sensor system;

project an image, wherein the image comprises an image element corresponding to each feature;

receive at least one first user-input and change the image in response to each first user-input.

30 . The head-up display as claimed in claim 29 wherein changing the image comprises at least one selected from the group comprising: a translation, rotation, skew or keystone of the image.

31 . The head-up display as claimed in claim 29 wherein the head-up display is arranged to receive a second user-input and, in response to the second user-input, determine a calibration function, wherein the calibration function represents the total change to the image made in response to the at least one first user-input.

32 . The head-up display as claimed in claim 31 wherein the head-up display is arranged, during normal display operation, to apply the calibration function to each source image before projection.

33 . The head-up display as claimed in claim 29 , wherein the head-up display is further arranged to:

determine an input image from the obtained information on the real-world scene;

determine a hologram of the input image; and

illuminate the hologram in order to project the image.

34 . The head-up display as claimed in claim 29 wherein the suitability criterion relates to a physical property or parameter of the at least one feature such as shape or length.

35 . The head-up display as claimed in claim 29 wherein satisfying the suitability criterion comprises having at least one selected from the group comprising: a straight line or edge with a minimum length; at least two straight sides each with a minimum length; a polygonal shape with a minimum area; or a circular or elliptical shape with an minimum dimension or area.