Projection device for a vehicle projector

Abstract

A control system for a vehicle projector, characterized in that it comprises a vehicle control subsystem and a vehicle projector; wherein the vehicle projector is configured to display a mode selection page of the vehicle projector in response to a start operation for the vehicle projector, the mode selection page containing a plurality of projection modes; and to obtain a target projection mode in response to a user-initiated mode selection operation for the plurality of projection modes; and the vehicle control subsystem is configured to determine a projection direction and a projection angle of the vehicle projector corresponding to the target projection mode, and to control the vehicle projector to project a projection image in the projection direction and at the projection angle.

Description

Technical FieldThe present invention relates to the technical field of automatic vehicle control, and more particularly, to a projection method, an apparatus, and a medium for a vehicle projector.Prior ArtAs smart vehicles become increasingly widely used, various auxiliary devices in vehicles are becoming more and more versatile, with vehicle projectors being among the more common auxiliary devices. The vehicle projectors may normally be mounted in the vicinity of the vehicle headlights.Currently, vehicle projectors are generally used only for the conventional projection function, such as projection on a canvas for reproducing images and videos. However, the vehicle projectors may not meet the needs of the users in various scenarios, resulting in lower user experience.Content of the Present Utility ModelThe present invention provides a projection method, an apparatus, and a medium for a vehicle projector to solve technical problems that the application of conventional vehicle projectors is simple, which cannot satisfy the reproduction needs of the users and impair the user experience.According to a first aspect of the present invention, there is provided a control method for a vehicle projector, comprising:displaying a mode selection side of the vehicle projector in response to a start operation for the vehicle projector, the mode selection side including a plurality of projection modes, the plurality of projection modes including at least one light mode;obtaining a target projection mode in response to a user-initiated mode selection operation for the plurality of projection modes;determining a projection direction and a projection angle of the vehicle projector corresponding to the target projection mode;controlling the vehicle projector to project a projection image in the projection direction and at the projection angle.In one possible embodiment, determining the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode comprises:determining a tilting direction and a tilting angle of the vehicle in which the vehicle projector is located, wherein the tilting angle denotes the angle between the x-axis of the vehicle coordinate system of the vehicle and the horizontal plane, and the tilting direction denotes the direction of the x-axis of the vehicle coordinate system of the vehicle with respect to the horizontal plane;determining the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode according to the inclination direction and the inclination angle.In one possible embodiment, the determining of the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode according to the inclination direction and the inclination angle includes:determining the inclination angle as the projection angle of the vehicle projector corresponding to the target projection mode;determining the direction opposite to the inclination direction as the projection direction of the vehicle projector corresponding to the target projection mode.In one possible embodiment, the determination of the inclination direction and the inclination angle of the vehicle in which the vehicle projector is located comprises:determining a first height detected by a first sensor, wherein the first sensor is a height sensor located at the front wheel of the vehicle;determining a second height detected by a second sensor, wherein the second sensor is a height sensor located at the rear wheel of the vehicle;determining a distance between the first sensor and the second sensor; andperforming a rules making calculation based on the distance, the first height, and the second height to determine the inclination direction and the inclination angle of the vehicle in which the vehicle projector is located.In a possible embodiment, the plurality of projection modes also include at least a horizontal projection mode and a ground projection mode, wherein the horizontal projection mode refers to the projector projecting a projection image onto a screen and the ground projection mode refers to the projector projecting downwardly onto the ground at a predefined angle.In one possible embodiment, a projection lens of the vehicle projector is arranged on a rotation axis, wherein the rotation axis is controlled by a stepping motor which is located on the vehicle projector, and comprises controlling the vehicle projector for projecting the projection image in the projection direction and at the projection angle:calculating a number of rotations of the stepping motor according to the projection angle and the pitch of the stepping motor corresponding to the projector;determining a rotational direction of the stepping motor according to the projection direction;controlling the stepping motor to rotate in the rotational direction and the number of rotations so that the vehicle projector projects the projection image in the projection direction and at the projection angle.In one possible embodiment, when the target projection mode is the light mode, controlling the vehicle projector to project the projection image in the projection direction and at the projection angle comprises:controlling the vehicle projector to perform projection in the projection direction and at the projection angle.In a possible embodiment, it further comprises one of the following:The vehicle projector is mounted between both headlights of the vehicle;There are two vehicle projectors which are respectively mounted in the headlight regions of the two headlights of the vehicle.According to a second aspect of the present invention, there is provided a control device for a vehicle projector, comprising:a start unit for displaying a mode selection side of the vehicle projector in response to a start operation for the vehicle projector, the mode selection side including a plurality of projection modes, the plurality of projection modes including at least one light mode;a selection unit for obtaining a target projection mode in response to a user-initiated mode selection operation for the plurality of projection modes;a determination unit for determining a projection direction and a projection angle of the vehicle projector corresponding to the target projection mode;a projection unit for controlling the vehicle projector to project a projection image in the projection direction and at the projection angle.According to a third aspect of the present invention, there is provided an electronic device comprising: a processor; and a memory communicatively connected to the processor, the memory configured to store a computer execution instruction; the processor configured to execute the computer execution instruction stored in the memory to implement the method according to any one of the embodiments of the first aspect.According to a fourth aspect of the present invention, there is provided a computer readable storage medium, the computer readable storage medium storing a computer execution instruction, the computer execution instruction, when executed, for realizing the method according to any one of the embodiments of the first aspect.According to a fifth aspect of the present invention, there is provided a computer program product comprising a computer program, the computer program, when executed, realizing the method according to any of the embodiments of the first aspect.In the technical solutions of the present invention, a mode selection side of the vehicle projector may be displayed in response to a start operation for the vehicle projector, the mode selection side including a plurality of projection modes. The provision of the plurality of projection modes may result in the operating modes of the vehicle projector becoming more versatile. Based on the mode selection operation performed by the user, a target projection mode selected by the user may be obtained, so that the projection mode of the vehicle projector is better matched to the needs of the user. After obtaining the target projection mode, the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode may be determined to control the vehicle projector to project a projection image in the projection direction and at the projection angle. By determining the projection direction and the projection angle of the vehicle projector, a better projection effect is achieved in the projection of the projection image. At the same time, not only the number of the projection modes is increased, but also better projection performance is achieved, thereby enhancing the experience of use of the vehicle projector.Brief Description of the DrawingsThe drawings attached herein are incorporated in and constitute a part of the specification, illustrate embodiments according to the present invention, and together with the description serve to explain the principles of the present invention. FIG. 1 is a schematic diagram of a control system of a vehicle projector in the related art according to an exemplary embodiment of the present invention; FIG. 2 is a schematic diagram of a control system of a vehicle projector according to an exemplary embodiment of the present invention; FIG. 3 is a flowchart of a control method for a vehicle projector according to an exemplary embodiment of the present invention; FIG. 4 is an exemplary illustration of vehicle inclination according to an exemplary embodiment of the present invention; FIG. 5 is a flowchart of a control method for a vehicle projector according to an exemplary embodiment of the present invention; FIG. 6 is an exemplary diagram of an application of a horizontal projection mode according to an exemplary embodiment of the present invention; FIG. 7 is an exemplary diagram of an application of a ground projection mode according to an exemplary embodiment of the present invention; FIG. 8 is an exemplary diagram showing the structure of a vehicle projector according to an exemplary embodiment of the present invention; FIG. 9 is a flowchart for controlling a vehicle projector according to an exemplary embodiment of the present invention; FIG. 10 is an exemplary diagram of an application of a light mode according to an exemplary embodiment of the present invention; FIG. 11 is a schematic diagram of a control device for a vehicle projector according to an exemplary embodiment of the present invention; FIG. 12 is a schematic diagram of the structure of an electronic device according to an exemplary embodiment of the present invention.Referring to the above drawings, there are shown specific embodiments of the present invention which will be described in more detail below. These accompanying drawings and descriptions are not intended to limit the scope of the present invention in any way, but should explain the concept of the present invention to a person skilled in the art by way of specific embodiments.DETAILED EMBODIMENTSExemplary embodiments illustrated in the accompanying drawings will be described in detail herein. When the following descriptions refer to the drawings, like reference numerals in different drawings designate like or similar elements, unless otherwise specified. The embodiments described in the following exemplary embodiments do not represent all embodiments that are consistent with this utility model. On the contrary, they are merely examples of apparatus and methods consistent with some aspects of the utility model as described in detail in the appended claims.In the specification and claims of the present invention, terms such as "first", "second", etc. are used to distinguish similar objects and not to describe a particular order or sequence. It is understood that these terms are interchangeable under appropriate circumstances, such that the embodiments of the present invention described herein may be carried out, for example, in a different order than that illustrated or described herein. Moreover, the terms "comprise" and "have", as well as all their variations, are intended to cover a non-exclusive inclusion. For example, a method, system, product, or apparatus comprising a series of steps or units need not be limited to the expressly listed steps or units, but may also include other steps or units not expressly listed or inherent to that method, product, or apparatus.It should be noted that the user information (including, but not limited to, user device information, personal user information, etc.) and data (including, but not limited to, analytics data, stored data, displayed data, etc.) involved in the present utility model are all authorized by the user or fully authorized by all parties. The collection, use, and processing of the relevant data must comply with applicable laws, regulations, and standards, and appropriate access has been provided to users during data collection to grant or deny approval.By way of example, FIG. 1 is a schematic diagram of a control system of a vehicle projector in the related art according to an exemplary embodiment of the present invention.As shown in FIG. 1, the related art system includes a vehicle control subsystem 10 and a vehicle projector 20. However, the vehicle projector 20 has only one projection function so far. This means that the function mode of the vehicle projector 20 is relatively simple and only provides the projection function to the users. Therefore, the vehicle projector may not meet the needs of the users in various scenarios, resulting in a lower user experience.By way of example, the vehicle control subsystem 10 may be located in a vehicle computer or in a terminal communicatively connected to the vehicle computer. Of course, the provision of the vehicle control subsystem 10 is not limited thereto and may be on servers, server clusters, and other devices. This embodiment does not further limit this.In order to solve the above-mentioned problems, the technical solutions of the present disclosure offer different projection modes based on the projection function of the vehicle projector. The extension of the projection modes allows the vehicle projector to adapt to different application scenarios. This provides users with corresponding projection modes for use requirements in different scenarios, thereby enabling application of the projector in multiple scenarios.In actual projection, it has been determined that different projection modes may require different projection effects. Different projection effects are influenced by the projection direction and the projection angle during the specific working process of the projector. Therefore, after the change of the projection mode, the projection direction and the projection angle can be adjusted to achieve a better projection effect of the adjusted projector.Reference is made to the control system of the vehicle projector shown in FIG. 2. After the projector's function modes are expanded, the vehicle control subsystem 10 may provide a selection function for the various modes and receive a user selected target projection mode after the user has been guided to perform the mode selection. After the target projection mode is obtained, a projection angle and a projection direction corresponding to the target projection mode may be obtained, and then the vehicle projector 20 may be adjusted based on the obtained projection angle and the projection direction. The projection direction of the vehicle projector may be, for example, D 1, D 2, or D 3. D 1 corresponds, for example, to a projection angle of a 1, and D 2 corresponds, for example, to a projection angle of a 2. D 3 corresponds to a projection angle of 0. Of course, the above-mentioned projection angles and projection directions are only exemplary and do not represent a specific limitation.Optionally, the control solution for a vehicle projector according to the embodiments of the present invention may be widely used in various scenarios such as city driving, cornering, high-speed driving, and outdoor activities. By expanding the projection modes of the vehicle projector, a solution is provided for the application of the projector in various scenarios.Hereinafter, the technical solutions of the present invention and the manner in which the technical solutions of the present invention solve the above-mentioned technical problems will be explained in detail using specific embodiments. The following specific embodiments may be combined with each other, and identical or similar concepts or processes may not be repeated in some embodiments. Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings.FIG. 3 is a flowchart of a control method for a vehicle projector according to an exemplary embodiment of the present invention. As shown in FIG. 3, the control method for a vehicle projector includes the following steps:S 301: displaying a mode selection side of the vehicle projector in response to a start operation for the vehicle projector, wherein the mode selection side includes a plurality of projection modes.Optionally, the vehicle projector control method provided by the present disclosure may be implemented by a vehicle projector control device that may be located in an electronic device. The electronic device can be, for example, a vehicle computer or a terminal device which is / is in a communication connection with the vehicle projector. That is, the vehicle control subsystem in the above-mentioned embodiment may be located in the vehicle computer or the terminal, and is for executing the control method for a vehicle projector according to the present disclosure.It should be understood that the vehicle projector may be any type of projector, for example, a digital projector, a laser projector, etc. In this embodiment, the specific type of vehicle projector is not limited any further.It should be understood that the vehicle projector launch operation may refer to a software or hardware launch operation initiated for the vehicle projector.Here, the software start operation refers to a start operation performed by operating a start button on a start side of the vehicle projector based on a connection established with the vehicle projector.The hardware start operation may refer to a start operation performed by operating a start button located on the housing of the vehicle projector or separately.Whether it is the software or hardware start operation, a mode selection side of the vehicle projector may be displayed on a display of the electronic device after the vehicle projector is started. The mode selection page may include multiple projection modes to provide the user with a selection option for the modes.Moreover, the mode selection side may also include other information for configuring the vehicle projector, such as the configuration of the projection parameters and projection contents. The present invention is not limited thereto.It is understood that the projection modes may refer to the specific operating modes of the vehicle projector, where the different projection modes have different operating parameters or modes. The mode selection page may display respective indications for the different projection modes, such as the name of the projection mode, its functions and the objects to be projected. By displaying the indicia, the user can be provided with a reliable orientation in selecting the projection mode so that he can quickly select the mode that better meets his requirements and the efficiency of the mode selection is thus enhanced.S 302: obtaining a target projection mode in response to a user-initiated mode selection operation for the plurality of projection modes.Optionally, the mode selection operation may be an operation initiated by the user for the target projection mode among a plurality of projection modes. That is, in response to the operation triggered by the user for the target projection mode among a plurality of projection modes, the target projection mode selected by the user can be obtained.The triggered operation may include, for example, a click operation, a double click operation, a swiping operation, etc., which is not further limited in this embodiment.S 303: determining a projection direction and a projection angle of the vehicle projector corresponding to the target projection mode.Optionally, step 303 may include: determining the projection direction and the projection angle of the vehicle projector according to the target projection mode. In other words, for the vehicle projector, the projection direction and the projection angle corresponding to the target projection mode are determined.Here, the projection direction may refer to a specific propagation direction of the light emitted by the vehicle projector. By way of example, the projection direction can comprise at least one of the following directions: a horizontal direction, an upward direction and a downward direction. The projection angle may refer to an angle between the light irradiated from the vehicle projector and the horizontal line.For example, when the projection direction is horizontal, the light of the vehicle projector is horizontally irradiated. When the projection direction is directed upward, the light of the vehicle projector is radiated at an elevation angle, that is, the light is radiated so as to be incident above the horizontal line. When the projection direction is directed downward, the light of the vehicle projector is radiated at an angle of depression, that is, the light is radiated so as to be incident below the horizontal line.It is understood that the light emitted by the vehicle projector may be the light that passes through the center of a lens of the vehicle projector and is perpendicular to the plane of this lens. To facilitate understanding, this lens may denote an extreme lens of the vehicle projector.S 304: controlling the vehicle projector to project a projection image in the projection direction and at the projection angle.Optionally, step 304 may include: controlling the rotation of the lens of the vehicle projector based on the projection direction and the projection angle such that the direction and angle of the lens coincide with the projection direction and the projection angle. After the lens is rotated, the projector may be controlled to project the projection image through that lens.It is to be understood that a selection page for the projection image can also be provided, via which the user can provide an object to be projected. The object to be projected may be images, videos, documents, or other multimedia contents, for example. The specific type of the object to be projected is not further limited in this embodiment.The projection image may denote a representation obtained by the projection of the object to be projected by the vehicle projector. For example, when the object to be projected is a video, the projection image may denote a representation obtained by projecting the video onto a canvas. Of course, the projection image can also relate to a reproduction of the object to be projected. In this embodiment, this is not further limited.In the control method for a vehicle projector according to the embodiments of the present invention, by providing the plurality of projection modes, the user is allowed to execute mode selection, so that a target projection mode better matched to the needs of the user is obtained. After obtaining the target projection mode, the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode may be determined to control the vehicle projector to project a projection image in the projection direction and at the projection angle. By determining the projection direction and the projection angle of the vehicle projector, a better projection effect is achieved in the projection of the projection image. At the same time, not only the number of the projection modes is increased, but also better projection performance is achieved, thereby enhancing the experience of use of the vehicle projector.In some embodiments, determining the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode includes:determining a tilting direction and a tilting angle of the vehicle in which the vehicle projector is located, wherein the tilting angle denotes the angle between the x-axis of the vehicle coordinate system of the vehicle and the horizontal plane, and the tilting direction denotes the direction of the x-axis of the vehicle coordinate system of the vehicle with respect to the horizontal plane;determining the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode according to the inclination direction and the inclination angle.FIG. 4 shows an example illustration of vehicle pitch. Referring to FIG. 4, it is assumed that the vehicle inclines upward when the vehicle compartment is loaded. In this case, the head of the vehicle inclines upward. The x-axis of the vehicle coordinate system may be designated 401, the horizontal plane or line as 402, and the angle between the two is α.Of course, in this case, the x-axis 401 points upward relative to the horizontal plane 402. Thus, the inclination direction is defined as a direction in which the x-axis of the vehicle coordinate system faces upward relative to the horizontal plane, or simply as an upward direction.Accordingly, the downward direction may mean a downward inclination of the vehicle, which will not be explained further here.Optionally, the determining the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode according to the inclination direction and the inclination angle may include: determining the projection direction of the vehicle projector corresponding to the target projection mode according to the inclination direction; determining the projection angle of the vehicle projector corresponding to the target projection mode according to the inclination angle.In this embodiment, in determining the projection direction and the projection angle corresponding to the target projection mode, real-time adjustment may be performed according to the inclination direction and the inclination angle of the vehicle to ensure that the projection direction and the projection angle of the vehicle projector match the vehicle position. This makes it possible to adaptively adjust the projection direction and the projection angle of the vehicle projector in accordance with the vehicle position, establish an association between the vehicle position and the projection of the vehicle projector, and achieve a more precise projection.In some embodiments, determining the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode according to the inclination direction and the inclination angle includes:determining the inclination angle as the projection angle of the vehicle projector corresponding to the target projection mode;determining the direction opposite to the inclination direction as the projection direction of the vehicle projector corresponding to the target projection mode.Optionally, the determining of the inclination angle as the projection angle of the vehicle projector corresponding to the target projection mode may include: setting the value of the inclination angle as the value of the projection angle of the vehicle projector corresponding to the target projection mode.Optionally, the determining of the direction opposite to the inclination direction as the projection direction of the vehicle projector corresponding to the target projection mode may refer to, when the inclination direction is the upward direction, determining the downward direction as the projection direction of the vehicle projector corresponding to the target projection mode; when the inclination direction is the downward direction, determining the upward direction as the projection direction of the vehicle projector corresponding to the target projection mode.Therefore, when the inclination direction is directed downward, the projection direction is directed upward. When the inclination direction is directed upward, the projection direction is directed downward.In the technical solutions of this disclosure, since the projector is fixed relative to the vehicle, the projector inclines as the vehicle inclines. Because the projection direction is provided opposite to the inclination direction of the vehicle, the projection direction of the vehicle projector can be compensated. Moreover, since the projection angle is made equal to the inclination angle, the negative influence of the vehicle posture on the projection can be compensated, which improves the projection effect and further enhances the user experience.In some embodiments, determining the direction of inclination and the angle of inclination of the vehicle in which the vehicle projector is located comprises:determining a first height detected by a first sensor, wherein the first sensor is a height sensor located at the front wheel of the vehicle;determining a second height detected by a second sensor, wherein the second sensor is a height sensor located at the rear wheel of the vehicle;determining a distance between the first sensor and the second sensor; andperforming a rules making calculation based on the distance, the first height, and the second height to determine the inclination direction and the inclination angle of the vehicle in which the vehicle projector is located.In order to facilitate understanding of the calculation process for the inclination direction and the inclination angle, reference is made to FIG. 4. Herein, the height detected by the first sensor 403 is the first height H 1, and the height detected by the second sensor 404 is the second height H 2.For example, when H1 is larger than H2, an upward inclination occurs, whereby the projection direction is determined to be an upward direction; when H1 is smaller than H2, an upward inclination occurs, whereby the projection direction is determined to be a downward direction.By way of example, the trigonometric calculation of the inclination distance of the vehicle can also be carried out by H 1, H 2 and the distance between the two sensors in order to determine the inclination angle.It is understood that the first sensor may communicate the detected first height to the electronic device. The second sensor may communicate the detected second height to the electronic device.In the technical solutions of the present utility model, the inclination direction and the inclination angle of the vehicle in which the vehicle projector is located may be determined in the above-described manner. The real-time detection of the tire height enables quick and precise determination of the inclination direction and the inclination angle of the vehicle, thereby improving the efficiency and accuracy of the calculation of the vehicle posture.In some embodiments, the plurality of projection modes also include at least a horizontal projection mode and a ground projection mode, wherein the horizontal projection mode refers to the projector projecting a projection image onto a screen and the ground projection mode refers to the projector projecting downwardly onto the ground at a predefined angle.FIG. 5 is a flowchart of a control method for the vehicle projector. Referring to FIG. 5, a digital projector may be started with a cell phone or a vehicle computer. Thereafter, the mode selection page may be displayed on the display of the mobile phone or vehicle computer. The user may select a mode as needed to obtain the corresponding target projection mode. After the target projection mode is obtained, the corresponding projection angle and the corresponding projection direction may be determined. Then, the vehicle projector is controlled for projection at the determined projection angle and in the projection direction. For example, in the horizontal projection mode, the projection may be onto the canvas to reproduce documents or videos. For example, in the ground projection mode, the projection may be performed on the ground to reproduce images or videos. The projected images may be, for example, cereal light, traffic signs, solid images, or game images.FIG. 6 is an exemplary illustration of an application of a horizontal projection mode. Referring to FIG. 6, the vehicle projector 601 may be located in the area of the headlights. The light emitted from the vehicle projector 601 may be projected horizontally onto the canvas 602. The horizontal plane or line is indicated by 603. The provision of the horizontal projection enables a normal projection of the vehicle projector and makes the vehicle projector suitable for scenarios such as external projection.FIG. 7 is an exemplary illustration of an application of a ground projection mode. Referring to FIG. 7, the vehicle projector 701 may be located in the area of the headlights. The light of the vehicle projector 701 may be radiated downward onto the floor 703. The projection area is labeled 702 as shown. Providing the ground projection mode enables projection without screen, whereby a simpler projection method can be adjusted and the range of application of the vehicle projector is effectively expanded.Based on the above embodiments, in some embodiments, a projection lens of the vehicle projector is arranged on a rotation axis, the rotation axis being controlled by a stepping motor located on the vehicle projector, and comprising controlling the vehicle projector to project the projection image in the projection direction and at the projection angle:calculating a number of rotations of the stepping motor according to the projection angle and the pitch of the stepping motor corresponding to the projector;determining a rotational direction of the stepping motor according to the projection direction;controlling the stepping motor to rotate in the rotational direction and the number of rotations so that the vehicle projector projects the projection image in the projection direction and at the projection angle.FIG. 8 is an exemplary diagram showing the structure of a vehicle projector. As shown in FIG. 8, the vehicle projector 802 may be located on a fixed bracket 804, and the lens of the vehicle projector 802 may be located on a rotating bracket 803. The rotary bracket 803 can be connected to the stepping motor 801.In doing so, stepper motor 801 may be controlled by the vehicle control subsystem and receives commands or instructions from the vehicle control subsystem.That is, controlling the stepping motor to rotate in the rotational direction and the number of rotations may be generating the commands or instructions to control the stepping motor according to the rotational direction and the number of rotations, sending them to the controller of the stepping motor, so that the controller rotates the stepping motor with the number and the direction of rotations indicated in the commands or instructions until the rotation is completed.FIG. 9 is a flowchart for controlling a vehicle projector. As shown in FIG. 9, the first and second vehicle tire sensors may send the first and second heights to the vehicle control subsystem, which determines the direction of projection and the angle of projection by calculating a vehicle pose as well as assigning the vehicle pose to an angle and a direction. Thus, the vehicle control subsystem can control the stepper motor based on this direction of projection and this angle of projection. After the stepping motor is completely controlled, the vehicle projector can be controlled to project the projection image.It is to be understood that determining the rotation direction of the stepping motor according to the projection direction may be concrete to bring the rotation direction of the stepping motor into agreement with the direction of the vehicle projector. An example of the rotation of the stepping motor is: the stepping motor rotates in a first direction, the vehicle projector rotates upward. The stepper motor rotates in a second direction, the vehicle projector rotates downward. In this example, the rotation direction of the stepping motor is the first direction when the projection direction faces upward. When the projection direction faces downward, the rotation direction of the stepping motor is the second direction.Of course, the above example of the rotation of the stepper motor is only exemplary, with the first and second directions only serving to distinguish different rotations for different rotational directions. In this embodiment, there are no other restrictions on the specific directions of the first and second directions. For example, the first direction may be a left rotation and the second direction may be a right rotation. Or, for example, the first direction may be a right rotation and the second direction may be a left rotation. Or, for example, the first direction may be a downward rotation and the second direction may be an upward rotation. Or, for example, the first direction may be an upward rotation and the second direction may be a downward rotation.In the technical solutions of the present disclosure, it is possible to calculate the number of rotations of the stepping motor by the projection angle and determine the rotation direction of the stepping motor by the projection direction. Then, based on the number of rotations and the rotational direction, the vehicle projector is controlled in terms of the angle and the direction. Thereby, the control process of the vehicle projector is made simpler and the rotation efficiency of the vehicle projector is improved.Based on the above embodiments, in some embodiments, the plurality of projection modes include at least one light mode, and when the target projection mode is the light mode, controlling the vehicle projector to project the projection image in the projection direction and at the projection angle includes:controlling the vehicle projector to project a white projection image in the projection direction and at the projection angle.Optionally, controlling the vehicle projector to project the white projection image in the projection direction and at the projection angle may include: controlling the projector to project a white image; or controlling a light emitting device of the projector to emit white light.In the projection area of the vehicle projector, a black or dark image can be projected in the white projection image onto the area in which a preceding vehicle is located. This prevents driving risks that might arise if the driver does not recognize the vehicle driving ahead in time on the basis of a completely white projection image, and thus further increases the projection safety.FIG. 10 shows an example illustration of an application of a light mode. Referring to FIG. 10, while the vehicle is traveling on a road 1004, the vehicle projector 1001 may project the white projection image forward. The projection angle and the projection direction can be adjusted according to the range and the direction of 1003. A black or dark image can be projected onto the area in which the preceding vehicle 1003 is located in order to increase the projection safety.By way of example, the light control system updates the light strategy when there is no object such as a vehicle, person, or animal in front of the vehicle and sends the updated light strategy to the projector engine. Accordingly, in one implementation, based on the updated light strategy, the projector drive controls the projector to project the white projection image into the illumination area of the vehicle to supplement the illumination area of the vehicle and to further increase the driving safety of the user by enhancing the light intensity.In another implementation, the light control system updates the light strategy when there is no object such as a vehicle, person, or animal in front of the vehicle and sends the updated light strategy to the projector engine. The projector drive then switches the projector off based on the updated light strategy or switches from the operating mode to the standby mode in order to reduce the energy consumption.In some embodiments, the control method for a vehicle projector further comprises one of the following:It further comprises one of the following:The vehicle projector is mounted between both headlights of the vehicle;There are two vehicle projectors which are respectively mounted in the headlight regions of the two headlights of the vehicle.Optionally, in the case of two vehicle projectors, the first vehicle projector can be mounted in the headlight region of the first front headlight and the second vehicle projector can be mounted in the headlight region of the second front headlight.In the technical solutions of the present disclosure, by attaching the projector between the two headlights, the projector can be positioned at the center of the vehicle. This allows a single projector to perform multiple projection functions, thereby reducing hardware costs. When the two projectors are respectively attached to the two headlights, the attachment of the two projectors may result in the projection effects of the two headlights being more uniform. In particular in the light mode, this can lead to the illumination of the two headlights being uniform in the projection regions, which further improves the driving safety of the vehicle.It should be noted that the projector described in the present invention, particularly the digital light processing (DLP) projector, employs an illumination method based on digital light processing (DLP) technology. The core part of DLP technology is the digital micromirror device (DMD) chip as an imaging device, which allows the projection of images by regulating the reflected light and can therefore realize high-resolution digital light curtains. Accordingly, the DLP projector updates the light strategy based on the situation of a vehicle or person in front of the vehicle and automatically switches between high and low beams according to the light strategy to create a dark zone in the area where the vehicle or person is located, thus avoiding glare. This can be used widely in various scenarios such as city driving, cornering, high-speed driving and in rainy weather and can further increase the driver safety. In addition, the DLP projector offers various new applications such as low beam, adaptive low beam, brightness control of road signs and weather recognition, which can be used to extend the vehicle functions and to improve the lighting system of the vehicle.In some embodiments, a portion of the projectors, in particular the laser projectors, can replace the headlights of the vehicle, taking into account their high brightness, and partially or completely fulfil the functions of the far and low beams. At the same time, they can, based on the road and vehicle situation, implement functions of the adaptive driving light system (AFS) such as the adaptive light distribution (ADB).An embodiment of the apparatus of the present invention which can be used to carry out the embodiment of the method of the present invention will be described below. For non-disclosed details in the embodiment of the apparatus of the present invention, reference is made to the embodiment of the method of the present invention.FIG. 11 is a schematic diagram showing the structure of a control device of a vehicle projector according to an exemplary embodiment of the present invention. As shown in FIG. 11, the control device 1100 of the vehicle projector includes a start unit 1101, a selection unit 1102, a determination unit 1103, and a projection unit 1104, wherein the start unit 1101 is configured to display a mode selection side of the vehicle projector in response to a start operation for the vehicle projector, the mode selection side including a plurality of projection modes; the selection unit 1102 is configured to obtain a target projection mode in response to a user-initiated mode selection operation for the plurality of projection modes; the determination unit 1103 is configured to determine a projection direction and a projection angle of the vehicle projector corresponding to the target projection mode; the projection unit 1104 is configured to control the vehicle projector to project a projection image in the projection direction and at the projection angle.In a possible embodiment, the determination unit 1103 may comprise:a determination module for determining a direction of inclination and an angle of inclination of the vehicle in which the vehicle projector is located, wherein the angle of inclination denotes an angle between the x-axis of the vehicle coordinate system of the vehicle and the horizontal plane, and the direction of inclination denotes a direction of the x-axis of the vehicle coordinate system of the vehicle with respect to the horizontal plane;a determining module for determining the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode according to the inclination direction and the inclination angle.In a possible embodiment, the determining module may comprise:an angle determination submodule for determining the inclination angle as a projection angle of the vehicle projector corresponding to the target projection mode;a direction determination submodule for determining the direction opposite to the inclination direction as a projection direction of the vehicle projector corresponding to the target projection mode.In one possible embodiment, the determination module may comprise:a first determination submodule for determining a first height detected by a first sensor, the first sensor being a height sensor located at the front wheel of the vehicle;a second determination submodule for determining a second height detected by a second sensor, the second sensor being a height sensor located at a rear wheel of the vehicle;a third determining submodule for determining a distance between the first sensor and the second sensor;a fourth determination submodule for performing a trigonometric calculation based on the distance, the first height, and the second height to determine the inclination direction and the inclination angle of the vehicle in which the vehicle projector is located.In a possible embodiment, the plurality of projection modes also include at least a horizontal projection mode and a ground projection mode, wherein the horizontal projection mode refers to the projector projecting a projection image onto a screen and the ground projection mode refers to the projector projecting downwardly onto the ground at a predefined angle.In one possible embodiment, a projection lens of the vehicle projector is arranged on a rotation axis, wherein the rotation axis is controlled by a stepping motor which is located on the vehicle projector, and the projection unit comprises:a first calculation module for calculating a number of rotations of the stepping motor according to the projection angle and the pitch of the stepping motor corresponding to the projector;a second calculation module for determining a rotation direction of the stepping motor according to the projection direction;a projection control module for controlling the stepping motor to rotate in the rotational direction and the number of rotations so that the vehicle projector projects the projection image in the projection direction and at the projection angle.In one possible embodiment, the plurality of projection modes include at least one light mode, and when the target projection mode is the light mode, the projection unit includes a white projection image projection unit for controlling the vehicle projector to project a white projection image in the projection direction and at the projection angle.In a possible embodiment, it further comprises one of the following:The vehicle projector is mounted between both headlights of the vehicle; there are two vehicle projectors mounted respectively in the headlight regions of the two headlights of the vehicle.The control device of the vehicle projector according to the embodiments of the present invention can execute the technical solutions shown in the above-mentioned embodiment of the method. The functional principle and the advantages are similar and will not be repeated here.It should be noted that the above-described division of the various modules of the device is only a logical function division. In the actual implementation, they may be wholly or partly integrated into a physical unit or physically separated. These modules may all be implemented in the form of software called by processing elements; they may also all be implemented in the form of hardware; or some modules may be implemented in the form of software called by processing elements and some modules in the form of hardware. For example, the processing module can be configured as an independent processing element or integrated into one of the chips of the above-mentioned device. Moreover, it can be stored in the form of program code in a memory of the above-mentioned device, the function of the processing module being called up and executed by one of the processing elements of the device. The implementation of other modules is similar. Moreover, these modules may be fully or partially integrated or implemented independently of each other. Here, the processing elements may be integrated circuits having signal processing capability. In the implementation, the individual steps of the above method or the above modules may be performed by integrated logic circuits of the hardware of the processing elements or by software-based instructions.For example, the above modules may be configured as one or more integrated circuits that are used to implement the above method, such as one or more application specific integrated circuits (ASIC), or one or more microprocessors (digital signal processor, DSP), or one or more programmable logic gate arrays (FPGA), etc. Moreover, when one of the above modules is called in the form of program code by a processing element, this processing element may be, for example, a universal processor, such as a central processing unit (CPU) or another processor capable of calling program code. Moreover, these modules may be integrated and implemented in the form of a system on a chip (SOC), for example.In the above embodiments, they may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, they may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions. When loading and executing the computer instructions on a computer, the processes or functions according to the embodiments of the present invention are generated in whole or in part. The computer may be a general purpose computer, a specialized computer, a computer network, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server, or data center via a wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, radio, microwave, etc.) This may be carried out in a further embodiment of the invention by transmitting a connection to another website, a different computer, server or data center. The computer readable storage medium may be any available medium accessible to the computer or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disk, hard disk, magnetic tape), optical media (e.g., digital versatile disk, DVD for short), or solid state disk (e.g., SSD for short), etc.FIG. 12 is a schematic diagram showing the structure of an electronic device according to an exemplary embodiment of the present invention. As shown in FIG. 12, the electronic device 120 of this embodiment includes:at least one processor 121; and a memory 122 communicatively connected to the processor.In this case, the memory 122 stores an instruction which can be executed by the at least one processor 121, wherein the instruction is executed by the at least one processor 121 in order to cause the electronic device to execute the method according to one of the above-mentioned exemplary embodiments.Optionally, the memory 122 may be either independent or integrated with the processor 121.The memory 122 may include a random access memory (RAM) and possibly also a non-volatile memory (non-volatile memory), such as at least one hard disk drive.The processor 121 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits used to implement the embodiments of the present invention. In particular, in implementing the control method for a vehicle projector described in the above-mentioned exemplary embodiment of the method, the electronic device may be, for example, a control device for a vehicle projector provided in a vehicle, such as a processor chip, or may be an electronic device having processing functions such as a server.Optionally, the electronic device may also include a communication interface 123. In a specific implementation, when the communication interface 123, the memory 122, and the processor 121 are implemented independently of each other, the communication interface 123, the memory 122, and the processor 121 may be connected to each other via a bus and communicate with each other. The bus may be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, or an extended industry standard architecture (EISA) bus, etc. The bus may be divided into address bus, data bus and control bus, but this does not mean that there is only one bus or one type of bus.Optionally, in a particular implementation, when the communication interface 123, the memory 122, and the processor 121 are integrated on a chip, the communication interface 123, the memory 122, and the processor 121 may communicate via internal interfaces.The implementation principles and technical effects of the electronic device provided in this embodiment can be taken from the previous embodiments and will not be explained further here.According to the embodiments of the present invention, a computer-readable storage medium is furthermore provided, wherein the computer-readable storage medium stores a computer execution instruction, wherein the computer execution instruction, when executed, serves to realize the method steps according to the above-mentioned embodiments of the method. The specific implementation methods and technical effects are similar and will not be discussed further herein.The above-mentioned computer-readable storage medium may be implemented by any type of volatile or nonvolatile memory devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable programmable read only memory (EPROM), programmable read only memory (PROM), read only memory (ROM), magnetic memory, flash memory, hard disk, or optical disk. The readable storage medium may be any available medium accessible from a general purpose or specialized computer.An example readable storage medium is coupled to a processor, whereby the processor is capable of reading information from and writing information to that readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may be incorporated in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium may also exist as separate components in the control device for a vehicle projector.According to the embodiments of the present invention, a computer program product is also provided which comprises a computer program, wherein the computer program, when executed, implements the method steps according to the above-mentioned embodiments of the method. The specific implementations and technical effects are similar and will not be discussed further herein.In addition, the present invention also provides a vehicle projector which can comprise a computer program, wherein the computer program, when executed, implements the method steps in the above-mentioned exemplary embodiments of the method. The specific implementation methods and technical effects are similar and will not be discussed further herein.One skilled in the art, having made the description and practice of the invention disclosed herein, will readily appreciate other embodiments of the present invention. The present invention is intended to cover all variations, uses or adaptations of this invention following the general principles of this invention and including the common technical knowledge or means within this field of art not disclosed in this invention. The specification and embodiments are to be considered as exemplary only, with the true scope and spirit of the present invention being defined by the following claims.It is to be understood that the present invention is not limited to the above-described detailed structure illustrated in the drawings, and various modifications and changes may be made within the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

A control system for a vehicle projector, characterized by comprising a vehicle control subsystem and a vehicle projector; wherein the vehicle projector is configured to display a mode selection side of the vehicle projector in response to a start operation for the vehicle projector, the mode selection side including a plurality of projection modes; and a target projection mode is obtained in response to a user-initiated mode selection operation for the plurality of projection modes; and the vehicle control subsystem is configured to determine a projection direction and a projection angle of the vehicle projector corresponding to the target projection mode, and to control the vehicle projector to project a projection image in the projection direction and at the projection angle.The control system according to claim 1, characterized in that the vehicle control subsystem is configured such that, when determining the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode, a tilt direction and a tilt angle of the vehicle in which the vehicle projector is located are determined, the tilt angle indicating an angle between the x-axis of the vehicle coordinate system of the vehicle and the horizontal plane, and the tilt direction indicating an x-axis direction of the vehicle coordinate system of the vehicle with respect to the horizontal plane; the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode are determined according to the tilt direction and the tilt angle.The control system according to claim 2, characterized in that the vehicle control subsystem is configured such that, when determining the projection direction and the projection angle of the vehicle projector corresponding to the target projection mode according to the inclination direction and the inclination angle, the inclination angle is determined as the projection angle of the vehicle projector corresponding to the target projection mode; the direction opposite to the inclination direction is determined as the projection direction of the vehicle projector corresponding to the target projection mode.The control system according to claim 2, characterized in that the vehicle control subsystem is configured such that, when detecting the inclination direction and the inclination angle of the vehicle in which the vehicle projector is located, a first height detected by a first sensor is detected, the first sensor being a height sensor located at the front wheel of the vehicle; a second height detected by a second sensor, the second sensor being a height sensor located at the rear wheel of the vehicle; a distance between the first sensor and the second sensor is detected; and a trigonometric calculation is performed based on the distance, the first height and the second height to detect the inclination direction and the inclination angle of the vehicle in which the vehicle projector is located.The control system according to any one of claims 1 to 4, characterized in that the plurality of projection modes include at least a horizontal projection mode and a ground projection mode, wherein the horizontal projection mode refers to the projector projecting a projection image onto a screen, and the ground projection mode refers to the projector projecting downward onto the ground at a predefined angle.The control system according to any one of claims 1 to 4, characterized in that a projection lens of the vehicle projector is disposed on a rotation axis, the rotation axis being controlled by a stepping motor disposed on the vehicle projector, and the vehicle control subsystem is configured such that, in controlling the vehicle projector to project the projection image in the projection direction and at the projection angle, a number of rotations of the stepping motor is calculated according to the projection angle and the pitch of the stepping motor corresponding to the projector; a rotation direction of the stepping motor is determined according to the projection direction; the stepping motor is controlled to rotate in the rotation direction and at the number of rotations so that the vehicle projector projects the projection image in the projection direction and at the projection angle.The control system according to any one of claims 1 to 4, characterized in that the plurality of projection modes include at least one light mode, wherein when the target projection mode is the light mode, the vehicle control subsystem is configured such that, in controlling the vehicle projector to project the projection image in the projection direction and at the projection angle, the vehicle projector is controlled to project a white projection image in the projection direction and at the projection angle.The control system according to any one of claims 1 to 4, characterized in that it further comprises one of: the vehicle projector is mounted between both headlights of the vehicle; two vehicle projectors are provided respectively mounted in the headlight areas of the two headlights of the vehicle.

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