CN111754442A - HUD image correction method, device and system - Google Patents
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Abstract
The invention relates to the technical field of HUD image correction, in particular to a HUD image correction method, device and system. The method comprises the following steps: acquiring an image to be corrected, projection plane parameters and display resolution; carrying out image segmentation on an image to be corrected according to the display resolution to obtain an image unit before the conversion of the corrected image; obtaining a correction parameter corresponding to the image unit according to the projection surface parameter and the image unit; respectively carrying out image correction on the corresponding image units according to the correction parameters to obtain image units after image conversion to be corrected; and integrating the corrected image units to obtain a corrected image. The invention preprocesses the image to be corrected to obtain the corrected image which can be displayed on the display medium without distortion, solves the problem that the image is easy to be distorted after HUD projection, greatly improves the precision of the HUD projection image, and rapidly outputs the corrected display video in real time, thereby displaying the video and the image on the specific display medium without distortion.
Description
Technical Field
The invention relates to the technical field of HUD image correction, in particular to a HUD image correction method, device and system.
Background
With the development of the automobile industry and the improvement of the living standard of people, the requirement of a user on vehicle-mounted information display is higher and higher. In addition to the Display of information on meters and central controls, more and more vehicles are beginning to use HUDs (Head-Up-displays) for information Display as an extension and supplement to the meter Display information. In order to facilitate development of the HUD as an independent module by applying a plurality of automobile factories and suppliers, associated peripheral elements such as a power supply, control and communication need to be added to the HUD module, and the cost of the product is increased.
Meanwhile, HUDs are generally used to project display information onto the windshield of an automobile, but because the windshield has a certain curvature, it is necessary to correct the information to be projected and displayed to ensure that the information can be displayed without distortion on the windshield. However, it is a difficult problem in the industry to ensure that a regular image can be displayed on an uneven windshield plane, and until now, no method or device for properly processing the HUD image correction exists.
Disclosure of Invention
The present invention provides a HUD image correction method, device and system to overcome at least one of the above-mentioned drawbacks (shortcomings) of the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a HUD image correction method is applied to a HUD image correction device, and comprises the following steps:
acquiring an image to be corrected, projection plane parameters and display resolution;
carrying out image segmentation on an image to be corrected according to the display resolution to obtain an image unit before the conversion of the corrected image;
obtaining a correction parameter corresponding to the image unit according to the projection surface parameter and the image unit;
respectively carrying out image correction on the corresponding image units according to the correction parameters to obtain image units after image conversion to be corrected;
and integrating the corrected image units to obtain a corrected image.
Further, the projection surface parameters include display medium curvature and size shape; the display medium is automobile front windshield glass, side windshield glass, rear windshield glass or skylight glass.
Further, the image segmentation of the image to be corrected according to the display resolution to obtain the image unit before the conversion of the corrected image includes:
obtaining a minimum correction unit according to the display resolution;
and carrying out image segmentation on the image to be corrected according to the minimum correction unit to obtain an image unit before the correction image is converted.
Further, the obtaining a correction parameter corresponding to the image unit according to the projection plane parameter and the image unit includes:
acquiring the center coordinates of each image unit;
and obtaining the correction parameters corresponding to each image unit according to the projection plane parameters and the center coordinates of each image unit.
Further, the image correction of the corresponding image units according to the correction parameters to obtain the image units after the image conversion to be corrected specifically includes:
and according to the correction parameters, performing correction operation on the central coordinates of the image units corresponding to the correction parameters to obtain the central coordinates of the corrected image units.
Further, the correction operations include rotation, scaling, translation, shearing, keystone correction, and conic correction.
Further, the integrating the image unit to obtain the corrected image specifically includes:
integrating and summarizing the central coordinates of the corrected image units to obtain an image unit central coordinate set of the corrected image;
and obtaining a corrected image according to the central coordinate set of the image unit.
The present invention also provides a HUD image correction device including:
the image generation module is used for being in communication connection with the vehicle-mounted bus, acquiring vehicle-mounted information, generating and sending image information to be displayed;
the image correction module is used for receiving the image information sent by the image generation module and correcting the image information to obtain corrected image information; and
and the image output module is in communication connection with the external optical module and is used for receiving the corrected image information, synthesizing the image and outputting the image to the optical module for image projection.
In addition, the invention also provides a HUD image correction system, which comprises a vehicle-mounted instrument and the HUD image correction device; the vehicle instrument comprises a processor; the HUD image correction device is in control connection with the processor and executes the following steps through the processor:
acquiring an image to be corrected, projection plane parameters and display resolution;
carrying out image segmentation on an image to be corrected according to the display resolution to obtain an image unit before the conversion of the corrected image;
obtaining a correction parameter corresponding to the image unit according to the projection surface parameter and the image unit;
respectively carrying out image correction on the corresponding image units according to the correction parameters to obtain image units after image conversion to be corrected;
and integrating the corrected image units to obtain a corrected image.
Further, the vehicle-mounted instrument further comprises a power module and a communication module; HUD image correction device realizes power supply and external communication through the power module and the communication module of on-vehicle instrument respectively.
The invention carries out pretreatment on the image to be corrected, obtains the correction parameter according to the projection surface parameter and the display resolution, and carries out correction treatment on the central coordinate of the image unit to obtain the corrected image which can be displayed on the display medium without distortion, solves the problem that the HUD is easy to distort after projection, greatly improves the precision of the HUD projection image, and outputs the corrected display video in real time rapidly to match with the irregular display medium, thereby displaying the video and the image on the specific display medium without distortion.
Drawings
Fig. 1 is a flow chart of a HUD image correction method according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a detailed structure of step 102 of the HUD image correction method according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating the detailed structure of step 103 of the HUD image calibration method according to the embodiment of the present invention.
FIG. 4 is a flowchart illustrating the detailed structure of step 105 of the HUD image calibration method according to the embodiment of the present invention.
Fig. 5 is an image contrast chart before and after the HUD image correction method according to the embodiment of the present invention.
FIG. 6 is a diagram illustrating a HUD image correction method according to an embodiment of the present invention.
FIG. 7 is a schematic diagram illustrating image unit rotation correction in the HUD image correction method according to the embodiment of the present invention.
Fig. 8 is a block diagram of the HUD image correction apparatus according to the embodiment of the present invention.
Fig. 9 is a block diagram of the HUD image correction system according to the embodiment of the present invention.
FIG. 10 is a block diagram of the communication between the modules of the HUD image calibration system according to the embodiment of the present invention.
FIG. 11 is a diagram illustrating the layout of the HUD image calibration system according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Fig. 1 is a flow chart showing a structure of a Head-Up-Display (HUD) image correction method according to an embodiment of the present invention.
As shown in fig. 1, the present embodiment provides a HUD image correction method, which is applied to a HUD image correction device for generating and correcting a HUD band display image so that it can be projected onto an irregular display medium without distortion. The method specifically comprises the following steps:
101. and acquiring an image to be corrected, projection plane parameters and display resolution.
The processor presets the display rule according to the HUD, presets the demonstration and obtains the image of treating the correction that has not been rectified yet to according to the projection environment of HUD, acquire its projection surface parameter and display resolution. Specifically, the projection plane parameters and the display resolution can be adjusted according to the projection requirements of the HUD.
It should be noted that the image to be corrected in this embodiment does not refer to a static image alone, but also includes video information composed of a dynamic image or a plurality of static images, that is, the application range of the image correction method includes a static image, a dynamic image, and a video.
For example, when the HUD is pre-installed, the projection plane parameters of the HUD are acquired according to the curvature and size of the display medium to be projected by the HUD, and the display resolution of the HUD is acquired according to the preset projection requirements of the HUD.
102. And carrying out image segmentation on the image to be corrected according to the display resolution to obtain an image unit before the conversion of the corrected image.
The display correction of the HUD image is performed for the subject based on the plane related to the display resolution, that is, the minimum correction unit, and the display plane may be divided into a plurality of minimum correction units according to the difference of the display resolution.
103. And obtaining a correction parameter corresponding to the image unit according to the projection plane parameter and the image unit.
In the correction process, the correction processing is performed in units of minimum correction units, i.e., in units of divided image units, each image unit corresponding to one correction parameter. Specifically, the position of the image unit is determined according to the coordinate position of the center point, and the position of the corrected image unit is determined according to the coordinate position of the center point after correction.
For example, assuming that the coordinates of the center point of the image unit before correction are (Xin, Yin) and the coordinates of the center point of the image unit after correction are (Xout, Yout), the position of the image unit before correction is represented by (Xin, Yin) and the position of the image unit after correction is represented by (Xout, Yout).
In the process of acquiring the correction parameters, the storage space of the parameters is divided and planned in advance, for example, 2 bytes of Byte per correction unit, and if the resolution of the display output is 320 × 240, the size of the divided storage space of the correction parameters is: 320x240x2 153600 Byte.
104. And respectively carrying out image correction on the corresponding image units according to the correction parameters to obtain the image units after the image to be corrected is transformed.
And after the processor acquires the correction parameters of each image unit, correcting the image units according to the correction parameters and preset correction rules, specifically, correcting data actually by using the coordinates of the center point of the image units.
For example, after the correction parameters are acquired, the coordinates of the center point of the image unit are corrected according to the correction parameters and preset correction rules, so that the operations of rotation, scaling, translation, shearing, trapezoidal correction and quadratic curve correction of the image unit are realized.
105. And integrating the corrected image units to obtain a corrected image.
And after the processor obtains the corrected image units, the corrected image units are collected and integrated according to the positions of the image units in the image to obtain a corrected image.
The method has the advantages that the image to be corrected is preprocessed, the correction parameters are obtained according to the projection surface parameters and the display resolution, the center coordinates of the image unit are corrected, the corrected image which can be displayed on the display medium in a distortion-free mode is obtained, the problem that distortion easily occurs after HUD projection is solved, the accuracy of the HUD projection image is greatly improved, the corrected display video is rapidly output in real time to match irregular display media, and therefore the video and the image are displayed on the specific display medium in a distortion-free mode.
In some embodiments, the projection surface parameters of the present embodiment specifically include the curvature and size shape of the display medium. In the present embodiment, the display medium is an automobile front windshield, side windshield, rear windshield, or sunroof.
Fig. 2 shows a flowchart of a detailed structure of step 102 of the HUD image correction method according to this embodiment.
As shown in fig. 2, in some embodiments, the step of performing image segmentation on the image to be corrected according to the display resolution to obtain an image unit before the correction image transformation specifically includes:
201. and obtaining a minimum correction unit according to the display resolution.
202. And carrying out image segmentation on the image to be corrected according to the minimum correction unit to obtain an image unit before the correction image is converted.
The minimum correction unit can be set according to actual requirements, and in this embodiment, the size of the minimum correction unit is one pixel.
Fig. 3 shows a flowchart of a specific structure of step 103 of the HUD image correction method according to this embodiment.
As shown in fig. 3, in some embodiments, the obtaining, according to the projection plane parameter and the image unit, a correction parameter corresponding to the image unit specifically includes:
301. the center coordinates of each image unit are acquired.
302. And obtaining the correction parameters corresponding to each image unit according to the projection plane parameters and the center coordinates of each image unit.
Specifically, the correction parameters include image correction parameters such as Tx, Ty, Ca, Cb, Cc, Cd, and the like, where Tx, Ty, a linear translation factor, that is, a factor that moves a point with original coordinates (x, y) by a distance T, can cooperate with the rotation distortion to operate together; ca, Cb, Cc and Cd are rotation factors for rotating the pixel (x, y) by an angle theta, and the correction parameters can be adjusted and replaced according to the curvature and the size and shape of the actual display medium.
In some embodiments, the step of performing image correction on the corresponding image units according to the correction parameters to obtain the image unit after the image to be corrected is specifically:
and according to the correction parameters, performing correction operation on the central coordinates of the image units corresponding to the correction parameters to obtain the central coordinates of the corrected image units.
In some embodiments, the corrective action includes rotation, scaling, translation, shearing, keystone correction, and conic correction.
Fig. 4 shows a flowchart of a detailed structure of step 105 of the HUD image correction method according to the present embodiment.
As shown in fig. 4, in some embodiments, the step of integrating the image units to obtain the corrected image specifically includes:
401. and integrating and summarizing the central coordinates of the corrected image units to obtain an image unit central coordinate set of the corrected image.
402. And obtaining a corrected image according to the central coordinate set of the image unit.
The processor sorts and summarizes the corrected image units to obtain corrected images, and then the corrected images are sent to the external optical projection component.
For better operation experience, referring to fig. 5-7, a specific calibration operation flow and a calculation method of the HUD image calibration method of the present embodiment are provided, specifically, before calibration, a calibration parameter storage space is to be divided according to the display resolution.
The coordinates of the center point before the correction of the image unit are assumed to be (Xin, Yin), and the coordinates of the center point after the distortion correction are assumed to be (Xout, Yout). During correction, the processor determines and obtains correction parameters of each image unit according to the curvature and the size layout of the display medium, wherein the correction parameters comprise Tx, Ty, Ca, Cb, Cc and Cd. After the correction parameters are obtained, the required correction mode is obtained according to the corresponding position of the image unit, and the preset correction rule of the image unit is obtained, wherein in this embodiment, the preset correction rule includes rotation, scaling, translation, shearing, trapezoidal correction, and conic correction.
Specifically, the present embodiment provides specific calculation of the preset correction rule:
wherein, the translation calculation formula is as follows:
the calculation formula of rotation and scaling is as follows:
and (Xout, Yout) correction transformation of transforming the position of the pixel point with the original coordinate of (Xin, Yin) is realized through the matrix calculation formula.
Of course, specifically, if the image is to be rotated by θ degrees, the calculation formula is:
as described above, in the data debugging aspect, the control variable data related to the correction is set up and adjusted according to the actual projection display medium through the used correction calibration interface in the instrument development stage, i.e., the debugging stage, and the finally adjusted parameters are solidified in the program code, so that the image correction after the instrument is powered on is realized, and the display effect of adapting the display medium is finally achieved.
More specifically, after the HUD development is finished, in the mass production stage, the calibrated data is solidified into the program code and stored in the specific memory, so as to realize the debugging of the correction parameters in the HUD image correction method.
Fig. 8 shows a block diagram of the HUD image correction apparatus of the present embodiment.
As shown in fig. 8, the present embodiment also provides a HUD image correction device, which mainly performs a correction operation on an output image of a HUD according to a HUD image correction method, and specifically, the device includes an image generation module 501, an image correction module 502, and an image output module 503. The image generation module 501 is used for communicating with a vehicle-mounted bus, acquiring vehicle-mounted information, generating and sending image information to be displayed; the image correction module 502 is configured to receive the image information sent by the image generation module 501, and correct the image information to obtain corrected image information; the image output module 503 is in communication connection with an external optical module, and is configured to receive the corrected image information, perform image synthesis, and output the image information to the optical module for image projection.
The advantage of the device of this embodiment is that this device realizes the correction operation of HUD output image through image generation module 501, image correction module 502 and image output module 503, makes its image or video can undistorted projection on the display medium to improve its projection accuracy, increase user's use and experience, and then improve the market competitiveness of product.
Fig. 9 shows a block diagram of the HUD image correction system of the present embodiment.
As shown in fig. 9, the present embodiment also provides a HUD image correction system, including an in-vehicle meter 610 and the HUD image correction device 500 described above; referring to fig. 9-11, the vehicle-mounted meter 610 includes a processor 611, and the processor 611 is mainly used for processing information communication and data processing of the vehicle-mounted meter 610; in the present embodiment, the HUD image correction apparatus 500 is in control connection with the processor 611, multiplexes the processor 611 with the in-vehicle meter 610, and executes the following steps by the processor 611:
acquiring an image to be corrected, projection plane parameters and display resolution;
carrying out image segmentation on an image to be corrected according to the display resolution to obtain an image unit before the conversion of the corrected image;
obtaining a correction parameter corresponding to the image unit according to the projection surface parameter and the image unit;
respectively carrying out image correction on the corresponding image units according to the correction parameters to obtain image units after image conversion to be corrected;
and integrating the corrected image units to obtain a corrected image.
More specifically, in some embodiments, the vehicle instrument 610 further includes a power module 612 and a communication module 613; the HUD image correction device 500 and the vehicle-mounted instrument 610 multiplex the power module 612 and the communication module 613, and power supply in the device and communication with the outside are realized through the power module 612 and the communication module 613 of the vehicle-mounted instrument 610, respectively.
The benefit of this embodiment system lies in, this system will be applied to the HUD image correcting unit 500 integration in the car inside the instrument, and multiplex HUD image correcting unit 500's essential device and on-vehicle instrument 610, realize the integration of HUD image correcting unit 500 and automobile body information and show, entire system's cost has been saved widely, and satisfy the correction preliminary treatment at automobile each azimuth windshield's projection display image, it is too many to have solved basic equipment in the current HUD image correction scheme, the problem of too high cost, promote the development efficiency of HUD projection product, the stability of reinforcing system.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A HUD image correction method, applied to a HUD image correction device, comprising:
acquiring an image to be corrected, projection plane parameters and display resolution;
carrying out image segmentation on an image to be corrected according to the display resolution to obtain an image unit before the conversion of the corrected image;
obtaining a correction parameter corresponding to the image unit according to the projection surface parameter and the image unit;
respectively carrying out image correction on the corresponding image units according to the correction parameters to obtain image units after image conversion to be corrected;
and integrating the corrected image units to obtain a corrected image.
2. The HUD image correction method according to claim 1, wherein the projection plane parameters include a display medium curvature and a size shape; the display medium is automobile front windshield glass, side windshield glass, rear windshield glass or skylight glass.
3. The HUD image correction method according to claim 1, wherein the image segmentation of the image to be corrected according to the display resolution to obtain the image unit before the correction image transformation comprises:
obtaining a minimum correction unit according to the display resolution;
and carrying out image segmentation on the image to be corrected according to the minimum correction unit to obtain an image unit before the correction image is converted.
4. The HUD image correction method according to claim 1, wherein the deriving the correction parameter corresponding to the image unit based on the projection plane parameter and the image unit comprises:
acquiring the center coordinates of each image unit;
and obtaining the correction parameters corresponding to each image unit according to the projection plane parameters and the center coordinates of each image unit.
5. The HUD image correction method according to claim 1, wherein the image correction is performed on the corresponding image units according to the correction parameters, and the obtaining of the image unit after the image to be corrected is specifically:
and according to the correction parameters, performing correction operation on the central coordinates of the image units corresponding to the correction parameters to obtain the central coordinates of the corrected image units.
6. The HUD image correction method according to claim 5, characterized in that the correction operation includes rotation, scaling, translation, clipping, keystone correction, and conic correction.
7. The HUD image correction method according to claim 5, wherein the integrating the image units to obtain the corrected image specifically comprises:
integrating and summarizing the central coordinates of the corrected image units to obtain an image unit central coordinate set of the corrected image;
and obtaining a corrected image according to the central coordinate set of the image unit.
8. A HUD image correction device characterized by comprising:
the image generation module is used for being in communication connection with the vehicle-mounted bus, acquiring vehicle-mounted information, generating and sending image information to be displayed;
the image correction module is used for receiving the image information sent by the image generation module and correcting the image information to obtain corrected image information; and
and the image output module is in communication connection with the external optical module and is used for receiving the corrected image information, synthesizing the image and outputting the image to the optical module for image projection.
9. A HUD image correction system characterized by comprising an in-vehicle instrument and the HUD image correction device according to claim 8; the vehicle instrument comprises a processor; the HUD image correction device is in control connection with the processor and executes the following steps through the processor:
acquiring an image to be corrected, projection plane parameters and display resolution;
carrying out image segmentation on an image to be corrected according to the display resolution to obtain an image unit before the conversion of the corrected image;
obtaining a correction parameter corresponding to the image unit according to the projection surface parameter and the image unit;
respectively carrying out image correction on the corresponding image units according to the correction parameters to obtain image units after image conversion to be corrected;
and integrating the corrected image units to obtain a corrected image.
10. The HUD image correction system according to claim 9, wherein the vehicle-mounted meter further includes a power module and a communication module; HUD image correction device realizes power supply and external communication through the power module and the communication module of on-vehicle instrument respectively.
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