Projection Method and Apparatus, Vehicle, and AR-HUD
This application is applicable to the field of intelligent vehicles, and specifically provides a projection method and apparatus, a vehicle, and an AR-HUD. The projection method includes: obtaining image information and position information of a calibration object; projecting the calibration object based on the image information and the position information of the calibration object and an imaging model; and when an overlap ratio between the calibration object and a projection plane of the calibration object is less than a first threshold, adjusting a parameter of the imaging model. According to this application, an image projected and displayed may be aligned with a real world, which improves a projection display effect.
1 . A projection method, comprising:
obtaining image information and position information of a calibration object;
projecting the calibration object based on the image information and the position information of the calibration object and an imaging model; and
adjusting a parameter of the imaging model when an overlap ratio between the calibration object and a projection plane of the calibration object is less than a first threshold.
2 . The method according to claim 1 , wherein the adjusting a parameter of the imaging model comprises:
adjusting one or more parameters of a field of view and a position of an imaging plane of the imaging model.
3 . The method according to claim 2 , wherein the adjusting a parameter of the imaging model when an overlap ratio between the calibration object and a projection plane of the calibration object is less than a first threshold specifically comprises:
when an area difference between the calibration object and the projection plane of the calibration object is greater than a second threshold, adjusting the field of view of the imaging model.
4 . The method according to claim 2 , wherein the adjusting a parameter of the imaging model when an overlap ratio between the calibration object and a projection plane of the calibration object is less than a first threshold specifically comprises:
when an offset between the calibration object and the projection plane of the calibration object is greater than a third threshold, adjusting a two-dimensional position of the imaging plane of the imaging model.
5 . The method according to claim 1 , wherein
the overlap ratio between the calibration object and the projection plane of the calibration object is determined by using a pixel offset between the calibration object and the projection plane of the calibration object, and the pixel offset is determined by using an image that is captured by a camera and that comprises the calibration object and the projection plane of the calibration object.
6 . The method according to claim 1 , wherein
the imaging model is trained based on a training set comprising a plurality of training samples, wherein the training samples comprise parameters of human-eye position information, the image information and the position information of the calibration object, and the overlap ratio between the calibration object and the projection plane of the calibration object.
7 . The method according to claim 1 , wherein the method further comprises:
obtaining an alignment requirement of a user, and sending an alignment start prompt message to the user;
obtaining a human-eye position of the user, and aligning the parameter of the imaging model based on the human-eye position of the user; and
after the alignment is completed, sending an alignment completion prompt message to the user.
8 . The method according to claim 7 , wherein the method further comprises:
determining, by using a human eye, whether the calibration object overlaps the projection plane of the calibration object; and
when the calibration object does not overlap the projection plane of the calibration object, adjusting a parameter of an aligned imaging model according to an adjustment instruction of the user.
9 . A projection apparatus, comprising:
an obtaining module, configured to obtain image information and position information of a calibration object;
a projection module, configured to project the calibration object based on the image information and the position information of the calibration object and an imaging model; and
an adjustment module, configured to: when an overlap ratio between the calibration object and a projection plane of the calibration object is less than a first threshold, adjust a parameter of the imaging model.
10 . The apparatus according to claim 9 , wherein when being configured to adjust the parameter of the imaging model, the adjustment module is specifically configured to:
adjust one or more parameters of a field of view and a position of an imaging plane of the imaging model.
11 . The apparatus according to claim 10 , wherein the adjustment module is specifically configured to:
when an area difference between the calibration object and the projection plane of the calibration object is greater than a second threshold, adjust the field of view of the imaging model.
12 . The apparatus according to claim 10 , wherein the adjustment module is specifically configured to:
when an offset between the calibration object and the projection plane of the calibration object is greater than a third threshold, adjust a two-dimensional position of the imaging plane of the imaging model.
13 . The apparatus according to claim 9 , wherein
the overlap ratio between the calibration object and the projection plane of the calibration object is determined by using a pixel offset between the calibration object and the projection plane of the calibration object, and the pixel offset is determined by using an image that is captured by a camera and that comprises the calibration object and the projection plane of the calibration object.
14 . The apparatus according to claim 9 , wherein
the imaging model is trained based on a training set comprising a plurality of training samples, wherein the training samples comprise parameters of human-eye position information, the image information and the position information of the calibration object, and the overlap ratio between the calibration object and the projection plane of the calibration object.
15 . The apparatus according to claim 9 , wherein the apparatus further comprises:
a prompt module, configured to: when obtaining an alignment requirement of a user, send an alignment start prompt message to the user;
the adjustment module is further configured to align the parameter of the imaging model based on an obtained human-eye position of the user; and
the prompt module is further configured to: after the alignment is completed, send an alignment completion prompt message to the user.
16 . The apparatus according to claim 15 , wherein
the prompt module is further configured to prompt the user to determine, by using a human eye, whether the calibration object overlaps the projection plane of the calibration object; and
the adjustment module is further configured to: when the calibration object does not overlap the projection plane of the calibration object, adjust a parameter of an aligned imaging model according to an adjustment instruction of the user.
17 . A computer-readable storage medium, wherein the computer-readable medium stores program code, and when the program code is executed by a computer or a processor, the computer or the processor is enabled to perform the projection method according to claim 1 .