CN112666713B - Method for updating calibration data of head-up display - Google Patents
Method for updating calibration data of head-up display Download PDFInfo
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- CN112666713B CN112666713B CN202110007472.XA CN202110007472A CN112666713B CN 112666713 B CN112666713 B CN 112666713B CN 202110007472 A CN202110007472 A CN 202110007472A CN 112666713 B CN112666713 B CN 112666713B
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Abstract
The invention provides a method for updating calibration data of a head-up display, wherein a diagnosis device or a calibration data writing module is connected with the head-up display, and the method comprises the following steps of: acquiring a deflection angle of a current head-up display; acquiring second calibration data, which is calibration data corresponding to the deflection angle, from a plurality of first calibration data stored in a diagnostic device or a calibration data writing module; storing the second calibration data in a heads-up display; the image of the heads-up display is predistorted using the second calibration data. According to the method for updating the calibration data of the head-up display, only the predistortion data corresponding to the deflection angle of the current head-up display is stored, so that the space occupied by the predistortion data is reduced, and the space occupied by the predistortion data is not increased when the accuracy of the deflection angle is improved.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a method for updating calibration data of a head-up display.
Background
More and more vehicles are provided with head-up displays, and images generated by an image generating unit of the head-up displays are reflected to a windshield of the vehicle through optical components to form virtual images in front of a driver to present driving and navigation states and data.
Because the windshield is curved, the virtual image formed is distorted, and usually, predistortion data is used for calibration, for example, the generated image is rectangular, I points are taken in the length direction, J points are taken in the height direction, that is, i×j points are taken as reference points.
And acquiring the offset of the reference point when the head-up display displays the regular rectangle through detection equipment or an optical simulation system, and obtaining predistortion data after inversion. When the image is displayed, the image is adjusted according to the predistortion data, fig. 1 shows a predistortion schematic diagram of a regular rectangle with an assembly deflection angle of-2 degrees, the data adjustment of corresponding points is directly used for reference points, interpolation is carried out on the points between the reference points, namely, the predistortion is carried out, and the regular image is presented after the reflection of a curved windshield.
The head-up displays are assembled on the whole vehicle, each head-up display has different assembly deflection angles, and corresponding predistortion is needed to be carried out aiming at the deflection angle of the current head-up display so as to ensure the display effect.
The head-up display also has the function of adjusting the height of the virtual image according to the height of the driver, and corresponding predistortion is needed for different drivers according to the positions of eyes of the drivers.
For example, a set of predistortion data including offset data of 21 x 9 points is 1.6k, and is generally stored in an EEPROM, the assembly deflection angle precision of the head-up display is 1 degree, and predistortion data corresponding to a plurality of deflection angles of [ -2, -1,0,1,2] are provided. If the deflection angle accuracy is improved, for example by 0.1 degrees, it may be desirable to provide [ -2.0, -1.9, …, -0.1,0,0.1, …,1.9,2.0], requiring a greater amount of predistortion data to be stored.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for updating the predistortion data of the head-up display, which only stores the predistortion data corresponding to the deflection angle of the current head-up display, not only reduces the space occupied by the predistortion data, but also does not increase the space occupied by the predistortion data when the precision of the deflection angle is improved.
The invention provides a method for updating calibration data of a head-up display, wherein a diagnosis device or a calibration data writing module is connected with the head-up display, and the method comprises the following steps of:
acquiring a deflection angle of a current head-up display;
acquiring second calibration data, which is calibration data corresponding to the deflection angle, from a plurality of first calibration data stored in a diagnostic device or a calibration data writing module;
storing the second calibration data in a heads-up display;
the image of the heads-up display is predistorted using the second calibration data.
Further, obtaining the deflection angle of the head-up display includes: obtained from a yaw angle detection device or obtained through communication with a diagnostic device.
Further, each first calibration data corresponds to a deflection angle.
Further, the first calibration data includes one or more predistortion data.
Further, when the first calibration data includes N pieces of predistortion data, N is an integer greater than or equal to 2, and the second calibration data includes M pieces of predistortion data, M is less than or equal to N.
Further, when M is greater than or equal to 2, height adjustment is performed using the M predistortion data.
Further, when M is equal to 3, height adjustment is performed using predistortion data corresponding to the upper, middle, and lower three positions.
Further, the diagnostic device or the calibration data writing module is connected with the head-up display through a cable or a bus.
Further, the diagnosis device or the calibration data writing module comprises a plurality of sets of calibration data with different deflection angle precision, and when the calibration data of the head-up display is updated, second calibration data is obtained from first calibration data with the same corresponding deflection angle or the minimum difference value.
Further, the diagnostic device or the calibration data writing module comprises a plurality of sets of calibration data with different reference points, and when updating the calibration data of the head-up display, second calibration data is acquired from the first calibration data suitable for the reference point of the current head-up display.
Compared with the prior art, the method for updating the calibration data of the head-up display has the following beneficial effects: only the predistortion data corresponding to the deflection angle of the current head-up display is stored, so that not only is the space occupied by the predistortion data reduced, but also the space occupied by the predistortion data is not increased when the accuracy of the deflection angle is improved.
Drawings
FIG. 1 is a schematic diagram of predistortion of a regular rectangle with an assembly deflection angle of-2 degrees;
FIG. 2 is an enlarged view of a portion of the left side of FIG. 1;
FIG. 3 is a schematic representation of updating head-up display calibration data according to one embodiment of the invention;
FIG. 4 is a schematic diagram of updating head-up display calibration data according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of updating head-up display calibration data according to yet another embodiment of the present invention;
FIG. 6 is a schematic diagram of updating head-up display calibration data according to yet another embodiment of the present invention;
FIG. 7 is a schematic diagram of updating head-up display calibration data according to yet another embodiment of the present invention.
Detailed Description
As shown in fig. 3, the diagnostic device DD or the calibration data writing module (for example, a host computer or a software module connected via a CAN) is connected to the head-up display HUD, and the storage of the diagnostic device or the calibration data writing module includes 5 first calibration data, each of which corresponds to a yaw angle, and the 5 first calibration data respectively correspond to yaw angles-2, -1,0,1, 2.
In this embodiment, each first calibration data includes a predistortion data whereby the predistortion data predistorts the image to be displayed (i.e., preconditions a regular rectangle to the shape of fig. 1) presenting a regular image in front of the driver (the virtual image formed by the windscreen reflection is a regular rectangle).
Specifically, for 21 x 9 reference points, the first calibration data includes predistortion data for each reference point, such as:
{A11，B11，A12，B12，…，A121，B121，
A21，B21，A22，B22，…，A221，B221，
…，
A91，B91，A92，B92，…，A921，B921}
a method of updating head-up display calibration data according to one embodiment of the present invention includes the steps of:
acquiring a deflection angle of the current head-up display, for example, the deflection angle of the current head-up display is-2 degrees, and acquiring the deflection angle of the head-up display can be acquired from a deflection angle detection device connected by a cable or a network or acquired through communication with a diagnostic device;
acquiring second calibration data, which is calibration data corresponding to the deflection angle (-2 degrees), from a plurality of first calibration data stored in a diagnostic device or a calibration data writing module;
storing the second calibration data in a heads-up display;
the image of the heads-up display is predistorted using the second calibration data.
The deflection angle of the current head-up display is-2 degrees, only the calibration data corresponding to-2 degrees are stored, all 5 first calibration data in the diagnosis device are not required to be stored, only the predistortion data corresponding to the deflection angle are stored in the current head-up display, and the space occupied by the predistortion data is reduced.
As shown in fig. 4, if the deflection angle accuracy is improved, for example, 0.1 degrees, predistortion data corresponding to the deflection angle [ -2.0, -1.9, …, -0.1,0,0.1, …,1.9,2.0] is stored in the diagnostic apparatus, and thus 41 sets of predistortion data are stored.
The deflection angle of the current head-up display HUD is 0.1 (for example, clockwise direction may be positive direction, and anticlockwise direction may be negative direction), which means that the assembly deflection angle of the head-up display HUD is-0.1, that is, the head-up display HUD is deflected to the left by 0.1 degree, and predistortion data corresponding to 0.1 degree is stored in a corresponding storage unit of the head-up display HUD.
When the deflection angle of the current head-up display is detected to be 0.1 degree, only the predistortion data corresponding to the deflection angle (0.1 degree) is stored in the current head-up display, namely, when the accuracy of the deflection angle is improved, the space occupied by the predistortion data is not increased.
The diagnostic device can simultaneously store first calibration data with deflection angle precision of 1 degree and first calibration data with deflection angle precision of 0.1 degree, namely the diagnostic device or the calibration data writing module comprises a plurality of sets of calibration data with different deflection angle precision, and when updating the calibration data of the head-up display, second calibration data is obtained from the first calibration data with equal corresponding deflection angle or minimum difference value.
The driver's height is different, is fit for also can adjust in the height of this driver's new line display virtual image, can throw in windshield's relevant position, new line display HUD need needle in different heights and calibrate.
As shown in fig. 5, the diagnostic apparatus stores therein first calibration data corresponding to the deflection angles [ -2, -1,0,1,2], each of the first calibration data including high-order (H) predistortion data and low-order (L) predistortion data, for example, high-order predistortion data 1H and low-order predistortion data 1L corresponding to the deflection angle of 1 degree, the first calibration data including 2 predistortion data.
The deflection angle of the current head-up display HUD is 1 degree, high-order predistortion data 1H and low-order predistortion data 1L are obtained from first calibration data corresponding to the deflection angle of 1 degree, and the high-order predistortion data 1H and the low-order predistortion data 1L are used as second calibration data and stored in the current head-up display HUD.
That is, when the first calibration data includes N (n=2) pieces of predistortion data, N is an integer greater than or equal to 2, and the second calibration data includes M (m=2) pieces of predistortion data, M being equal to N. When M is greater than or equal to 2, M predistortion data can be used to make height adjustments.
And according to the height of the driver, carrying out linear difference on the high-order predistortion data 1H and the low-order predistortion data 1L to obtain predistortion data Dat, and calibrating by using the predistortion data Dat during calibration.
In another embodiment, as shown in fig. 6, first calibration data corresponding to deflection angles [ -2, -1,0,1,2] are stored in the diagnostic device, each first calibration data including high-order (H) predistortion data, medium-order (M) predistortion data, and low-order (L) predistortion data, the first calibration data including 3 predistortion data.
The deflection angle of the current head-up display HUD is 1 degree, high-order predistortion data 1H, middle-order predistortion data 1M and low-order predistortion data 1L corresponding to the deflection angle of 1 degree are obtained and used as second calibration data to be stored in the current head-up display HUD.
And according to the height of a driver, carrying out linear difference on the high-order predistortion data 1H, the middle-order predistortion data 1M and the low-order predistortion data 1L to obtain predistortion data Dat, and calibrating by using the predistortion data Dat during calibration.
Of course, if the performance of the controller is low, for example, height adjustment may not be performed, and as shown in fig. 7, only the middle (M) predistortion data corresponding to the deflection angle may be acquired as the second calibration data and stored in the current head up display HUD.
Or only the high-order predistortion data 1H and the low-order predistortion data 1L corresponding to deflection angles are acquired as second calibration data and stored in the current head-up display HUD.
That is, when the first calibration data includes N (n=3) pieces of predistortion data, N is an integer greater than or equal to 2, and the second calibration data includes M (m=1 or m=2) pieces of predistortion data, M is smaller than N. When M is greater than or equal to 2, height adjustment can be performed using M pieces of predistortion data, and when m=1, height adjustment is not performed.
In yet another embodiment, a calibration data writing module connected to the head-up display, such as an application installed on a computer, tablet or cell phone, is used to obtain the deflection angle from the head-up display by communication, obtain corresponding predistortion data from the data stored in the application, transmit to the head-up display HUD, and update the calibration data.
Because the stored data has no complex logic structure, the method can be used for after-sales, after-loading of head-up displays and the like, for example, a windshield is replaced, and the pre-distortion data of the head-up displays can be updated through a diagnosis device or a calibration data writing module which stores the pre-distortion data corresponding to the windshield, so that the image display quality of the head-up displays is improved.
In yet another embodiment, the diagnostic device or the calibration data writing module includes a plurality of sets of calibration data with different reference points, the more the reference points, the better the calibration effect, for example, the predistortion data with reference points of 21×9, the better the calibration effect is than the predistortion data with reference points of 15×7 (the number of reference points in the width direction is 15, and the number of reference points in the height direction is 7), and the better the quality of the image display is.
However, the more reference points, the greater the amount of calibration calculation will be, which is not necessarily suitable for heads-up displays with lower calculation performance.
Thus, when updating the head-up display calibration data, second calibration data is acquired from the first calibration data that is appropriate for the reference point of the current head-up display.
While the invention has been described in terms of preferred embodiments, the invention is not so limited. Any person skilled in the art shall not depart from the spirit and scope of the present invention and shall accordingly fall within the scope of the invention as defined by the appended claims.
Claims (8)
1. A method of updating calibration data of a head-up display to which a diagnostic device or a calibration data writing module is connected, the method comprising the steps of:
acquiring a deflection angle of a current head-up display;
acquiring second calibration data from a plurality of first calibration data stored in a diagnostic device or a calibration data writing module, wherein the first calibration data comprises one or more predistortion data, each first calibration data corresponds to a deflection angle, and the second calibration data corresponds to the deflection angle;
storing the second calibration data in a heads-up display;
the image of the heads-up display is predistorted using the second calibration data.
2. The method of updating heads-up display calibration data of claim 1 wherein obtaining a deflection angle of a heads-up display comprises: obtained from a yaw angle detection device or obtained through communication with a diagnostic device.
3. The method of updating heads-up display calibration data of claim 1 wherein when the first calibration data comprises N predistortion data, N is an integer greater than or equal to 2 and the second calibration data comprises M predistortion data, M is less than or equal to N.
4. The method of updating heads-up display calibration data as claimed in claim 3 wherein the height adjustment is performed using M predistortion data when M is greater than or equal to 2.
5. The method of updating head-up display calibration data of claim 4, wherein when M is equal to 3, height adjustment is performed using predistortion data corresponding to upper, middle, and lower three positions.
6. The method of updating heads-up display calibration data of claim 1 wherein the diagnostic device or calibration data writing module is connected to the heads-up display by a cable or bus.
7. The method for updating calibration data of a head-up display according to claim 1, wherein the diagnostic device or the calibration data writing module includes a plurality of sets of calibration data having different deflection angle precision, and when updating the calibration data of the head-up display, the second calibration data is acquired from the first calibration data having the same or minimum difference corresponding to the deflection angle.
8. The method of updating head-up display calibration data of claim 1, wherein the diagnostic device or the calibration data writing module comprises a plurality of sets of calibration data having different reference points, and wherein the second calibration data is obtained from the first calibration data for the reference point of the current head-up display when updating the head-up display calibration data.
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