CN114268777B - Starting method of laser projection equipment and laser projection system - Google Patents
Starting method of laser projection equipment and laser projection system Download PDFInfo
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- CN114268777B CN114268777B CN202111560475.2A CN202111560475A CN114268777B CN 114268777 B CN114268777 B CN 114268777B CN 202111560475 A CN202111560475 A CN 202111560475A CN 114268777 B CN114268777 B CN 114268777B
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Abstract
The application discloses a starting method of laser projection equipment and a laser projection system, and belongs to the technical field of laser projection. The method comprises the following steps: responding to a starting instruction, and projecting a starting picture with a plurality of characteristic patterns to a projection screen after the laser projection equipment is powered on; acquiring a shooting image obtained by shooting a projection screen by a camera; and if the projection image to be displayed is detected to need to be subjected to correction processing according to the shooting image, correcting the projection image to be displayed based on the characteristic graph in the shooting image. The correction process of the projection image to be displayed by the laser projection equipment can be hidden in the starting-up process of the laser projection equipment, so that the correction efficiency of the projection image to be displayed by the laser projection equipment is effectively improved.
Description
Technical Field
The present application relates to the field of laser projection technologies, and in particular, to a startup method of a laser projection device and a laser projection system.
Background
The ultra-short focal laser projection device may project a projected image onto a projection screen. For the ultra-short focal laser projection device, because the principle of projection imaging makes light emergent obliquely upwards, the position between the laser beam emergent from the optical engine in the ultra-short focal laser projection device and the projection screen must be aligned strictly, and slight shift of the ultra-short focal laser projection device can also cause deformation or distortion of a picture. If the user carelessly moves the ultra-short focal laser projection device, the projected image projected and displayed by the ultra-short focal laser projection device may exceed the projection screen, resulting in poor display effect of the displayed projected image.
Disclosure of Invention
The embodiment of the application provides a starting-up method of laser projection equipment and a laser projection system. The problem of the relatively poor display effect of projection image of prior art can be solved, technical scheme is as follows:
in one aspect, a method for starting up a laser projection device is provided, where the method includes:
responding to a starting instruction, and projecting a starting picture with a plurality of characteristic patterns to a projection screen after the laser projection equipment is powered on;
acquiring a shooting image obtained by shooting the projection screen by a camera;
and if the projection image to be displayed is detected to need to be corrected according to the shooting image, correcting the projection image to be displayed based on the characteristic graph in the shooting image.
In another aspect, there is provided a laser projection system comprising: the device comprises a laser projection device, a projection screen and a camera; the laser projection device is used for:
responding to a starting instruction, and projecting a starting picture with a plurality of characteristic patterns to the projection screen after the laser projection equipment is powered on;
acquiring a shooting image obtained by shooting the projection screen by the camera;
and if the projection image to be displayed is detected to need to be corrected according to the shooting image, correcting the projection image to be displayed based on the characteristic graph in the shooting image.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
the laser projection device can project a startup picture with a plurality of characteristic patterns to the projection screen in the startup process. Thus, after the laser projection device obtains the shooting image of the camera shooting the projection screen, the projection picture to be displayed can be corrected based on the characteristic graph in the shooting image. After the laser projection device projects the corrected projection image to the projection screen, the corrected projection image cannot exceed the projection screen, and the good display effect of the projection image displayed on the projection screen can be ensured. The correction instruction is not required to be manually triggered by a user, the laser projection equipment can realize the correction process of the projection image to be displayed, the correction process of the projection image to be displayed by the laser projection equipment can be hidden in the starting-up process of the laser projection equipment, the interaction process of the user and the laser projection equipment is simplified, the correction efficiency of the projection image to be displayed by the laser projection equipment is effectively improved, and the user experience is good.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a laser projection system according to an embodiment of the present application;
FIG. 2 is a flowchart of a method for starting up a laser projection device according to an embodiment of the present application;
FIG. 3 is a flowchart of another method for powering on a laser projection device according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a startup picture according to an embodiment of the present application;
fig. 5 is a schematic diagram of another boot-strap screen according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a laser projection system according to an embodiment of the application. The laser projection system 100 may include: a laser projection device 101, a camera 102 and a projection screen 103.
The laser projection device 101 may be an ultra-short focal laser projection device such as a laser television, among others. The projection screen 103 may typically be suspended from a wall, and the laser projection device 101 may project a picture onto the projection screen 103 such that the projection screen 103 is capable of presenting a corresponding picture.
The lens of the camera 102 may be an ultra-short focal ultra-wide angle lens. The camera 102 may be mounted on the laser projection device 101 and the camera 102 needs to be directed towards the projection screen 103. Here, the camera 102 may be electrically connected to the laser projection device 101.
In this way, when there is a deviation between the screen projected by the laser projection apparatus 102 and the projection screen 103, the laser projection apparatus 101 can control the camera 102 to take a picture of the projection screen 103 when projecting a correction image to the projection screen 103, and the camera 102 can transmit the picture taken by it to the laser projection apparatus, so that the laser projection apparatus 101 can correct the projection image to be displayed based on the positional relationship between the projection screen and the correction image in the picture taken by the camera. In this way, the corrected projection image to be displayed has a smaller deviation from the projection screen 103 when displayed on the projection screen 103.
In the related art, after a deviation exists between a picture projected by the laser projection device and a projection screen, a user is required to manually trigger a correction command. By way of example, a user may trigger a correction instruction through a projection client installed in a mobile terminal (e.g., a cell phone) communicatively coupled to the laser projection device. For example, the display interface of the projection client may display a correction button, and the projection client may generate a correction instruction after detecting a click operation of the correction button by the user. The projection client may then send the correction instructions to the laser projection device. After receiving the correction instruction sent by the projection client, the laser projection device can respond to the correction instruction to correct the projection image to be displayed. The process of correcting the projected image projected by the laser projection device is complicated.
However, the manner of manually triggering the correction instruction is complicated, resulting in a lower efficiency of correcting the projected image to be displayed by the laser projection apparatus.
Referring to fig. 2, fig. 2 is a flowchart of a startup method of a laser projection device according to an embodiment of the application. The power-on method of the laser projection device is applied to the laser projection device 101 in the power-on projection system 100 shown in fig. 1. The starting-up method of the laser projection device can comprise the following steps:
step 201, in response to a power-on instruction, after the laser projection device is powered on, a power-on picture with a plurality of feature patterns is projected to a projection screen.
In the embodiment of the application, after the laser projection equipment receives the starting-up instruction, the laser projection equipment can respond to the starting-up instruction to perform power-up operation. After completion on the laser projection device, the laser projection device may project a boot-up screen with a plurality of feature graphics onto the projection screen.
Step 202, obtaining a shooting image obtained by shooting a projection screen by a camera.
In the embodiment of the application, after the laser projection device projects the startup picture to the projection screen, the laser projection device can control the camera to shoot the projection screen, and the laser projection device can also acquire a shooting image obtained by shooting the projection screen by the camera.
Step 203, if it is detected that the projected image to be displayed needs to be corrected according to the captured image, correcting the projected image to be displayed based on the feature pattern in the captured image.
In the embodiment of the application, after the laser projection device acquires the shot image, whether the projection image to be displayed needs to be corrected or not can be detected according to the shot image. If the laser projection device detects that the projected image to be displayed needs to be corrected, the laser projection device can correct the projected image to be displayed based on the feature pattern in the photographed image.
In summary, according to the startup method of the laser projection device provided by the embodiment of the application, the laser projection device can project the startup picture with a plurality of characteristic patterns to the projection screen in the startup process. Thus, after the laser projection device obtains the shooting image of the camera shooting the projection screen, the projection picture to be displayed can be corrected based on the characteristic graph in the shooting image. After the laser projection device projects the corrected projection image to the projection screen, the corrected projection image cannot exceed the projection screen, and the good display effect of the projection image displayed on the projection screen can be ensured. The correction instruction is not required to be manually triggered by a user, the laser projection equipment can realize the correction process of the projection image to be displayed, the correction process of the projection image to be displayed by the laser projection equipment can be hidden in the starting-up process of the laser projection equipment, the interaction process of the user and the laser projection equipment is simplified, the correction efficiency of the projection image to be displayed by the laser projection equipment is effectively improved, and the user experience is good.
Referring to fig. 3, fig. 3 is a flowchart of another method for starting up a laser projection device according to an embodiment of the application. The power-on method of the laser projection device is applied to the laser projection device 101 in the power-on projection system 100 shown in fig. 1. The starting-up method of the laser projection device can comprise the following steps:
step 301, in response to a power-on command, after the laser projection device is powered on, a power-on picture with a plurality of feature patterns is projected to a projection screen.
By way of example, a user may trigger a power-on command via a mobile device communicatively coupled to the laser projection device. The mobile device may be a mobile terminal such as a mobile phone, or a remote controller paired with the laser projection device. In one possible case, when the mobile device is a mobile terminal, a display interface of a projection client installed in the mobile terminal may display a start button, and after detecting a click operation of a user on the start button, the projection client may generate a start instruction, and the projection client may send the start instruction to the laser projection device. In another possible case, when the mobile device is a remote controller, a power-on button may be integrated on the remote controller, and after the remote controller detects a pressing operation of the power-on button by a user, a power-on instruction may be generated and sent to the laser projection device.
In the embodiment of the application, after the laser projection equipment receives the starting-up instruction, the laser projection equipment can respond to the starting-up instruction, and the laser projection equipment can be started up. In the process of starting up the laser projection device, the laser projection device needs to perform power-on operation on various devices (such as a laser, a light valve and the like) integrated therein, and also needs to perform initialization process on various functional modules (such as a laser projection main board, a motion compensation module, an image display module and the like) integrated therein.
In the application, after the laser projection equipment is powered on, devices such as a laser, a light valve and the like in the laser projection equipment can work normally, so that the laser projection equipment can project a startup picture with a plurality of characteristic patterns to a projection screen.
As shown in fig. 4, fig. 4 is a schematic diagram of a boot image according to an embodiment of the present application. The boot-up picture projected by the laser projection device may include: a main screen 01, and a plurality of feature patterns 02 surrounding the main screen. The main picture 01 can be pictures such as a startup animation or a brand icon; feature pattern 02 may be diamond, five-pointed star, cross, etc. The feature patterns 02 may be uniformly distributed around the main screen 01, and each feature pattern 02 in the startup screen may be the same or different, which is not limited herein.
In the present application, in order to facilitate the correction of the projected image to be displayed by the subsequent laser projection apparatus based on the feature patterns in the boot-strap picture, the color of each feature pattern 02 in the boot-strap picture may be different from the background color of the region other than the main picture in the boot-strap picture.
For example, as shown in fig. 4, the shape of the feature pattern 02 in the boot-strap picture is diamond-shaped, and the color of the feature pattern 02 is black; the background color of the region between the main pictures is white.
For another example, as shown in fig. 5, fig. 5 is a schematic diagram of another boot image according to an embodiment of the present application. The shape of the feature pattern 02 in the starting picture is five-pointed star, and the color of the feature pattern 02 is white; the background color of the region between the main pictures is black.
Step 302, obtaining a shooting image obtained by shooting a projection screen by a camera.
In the embodiment of the application, after the laser projection device projects the startup picture to the projection screen, the laser projection device can control the camera to shoot the projection screen. After the projection screen is shot by the camera, a shot image can be obtained, and the camera can send the shot image to the laser projection device. Thus, the laser projection device can acquire the shooting image obtained by shooting the projection screen by the camera.
The projection screen is provided with a startup picture projected by the laser projection device, so that a shooting image obtained after the camera shoots the projection screen can be: an image comprising a projection screen and a boot picture presented on the projection screen.
Step 303, detecting whether the projection image to be displayed needs to be corrected or not according to the shot image.
In the embodiment of the application, after the laser projection device acquires the shot image, the laser projection device can detect whether the projection image to be displayed needs to be corrected or not according to the shot image. The projection image to be displayed refers to a projection image which is to be projected by the laser projection device but is not projected yet.
For example, if the laser projection device detects that the projected image to be displayed needs to be corrected according to the captured image, step 304 is executed; if the laser projection device detects that the projected image to be displayed does not need to be corrected according to the captured image, step 305 is executed.
In the present application, there are various ways in which the laser projection device detects whether an image to be displayed needs to be corrected according to a captured image, and the following three alternative implementation ways are taken as examples for illustrative purposes in the embodiment of the present application:
in a first alternative implementation manner, the detecting, by the laser projection device, whether the image to be displayed needs to be subjected to correction processing according to the captured image may include:
and A1, detecting whether a starting picture in the shot image exceeds the frame of the projection screen according to the shot image.
In the embodiment of the application, the shot image can contain a projection screen and a startup picture presented on the projection screen. Thus, the laser projection device can detect whether the boot picture in the captured image exceeds the frame of the projection screen. For example, if the laser projection device detects that the startup picture in the shot image exceeds the frame of the projection screen, executing the step B1; if the laser projection device detects that the starting picture in the shot image does not exceed the frame of the projection screen, the step C1 is executed.
In the present application, there are various ways in which the laser projection device detects whether the startup picture in the shot image exceeds the frame of the projection screen, and the following two possible cases will be schematically described in the embodiments of the present application.
In a first possible case, the laser projection device may determine the outline of the border of the projection screen, as well as the outline of the boot picture, in the captured image. If the laser projection device detects that the area surrounded by the outline of the starting-up picture is at least partially outside the area surrounded by the outline of the frame of the projection screen, the laser projection device can determine that the starting-up picture in the shot image exceeds the frame of the projection screen, and at this time, the laser projection device needs to execute the following step B1; if the laser projection device detects that the area surrounded by the outline of the startup picture is all located in the area surrounded by the outline of the frame of the projection screen, the laser projection device can determine that the startup picture in the shot image does not exceed the frame of the projection screen, and at this time, the laser projection device needs to execute the following step C1.
By way of example, since the color of the projection screen in the captured image is typically black (or gray). Therefore, in order to facilitate the laser projection apparatus to distinguish the projection screen from the boot-up screen in the captured image, the background color of the boot-up screen projected by the laser projection apparatus may be set to white, that is, the boot-up screen projected by the laser projection apparatus is the boot-up screen shown in fig. 4.
In this case, the laser projection device may determine the position of the outline of the bezel of the projection screen in the captured image and the position of the outline of the boot screen in the captured image based on the gray-scale values of the respective pixels in the captured image. In this way, the laser projection device can determine the positional relationship between the area surrounded by the outline of the startup picture and the area surrounded by the outline of the frame of the projection screen according to the position of the outline of the frame of the projection screen in the shot image and the position of the outline of the startup picture in the shot image, so as to determine whether the startup picture in the shot image exceeds the frame of the projection screen.
In a second possible case, the laser projection device may determine the target projection position of each feature pattern of the boot-strap picture on the projection screen according to the captured image. If the laser projection device detects that the deviation between the target projection position of the feature pattern on the projection screen and the initial position of the feature pattern on the projection screen is larger than a preset value, and the starting picture in the shot image is determined to exceed the frame of the projection screen, the laser projection device needs to execute the following step B1; if the laser projection device detects that the deviation between the target projection position of the feature pattern on the projection screen and the initial position of the feature pattern on the projection screen is not greater than the preset value, and it is determined that the starting picture in the shot image does not exceed the frame of the projection screen, the laser projection device needs to execute the following step B2.
Here, the initial positions of the feature patterns in the starting picture on the projection screen are: and when the starting-up picture does not exceed the projection screen, the position of each characteristic graph in the starting-up picture on the projection screen. In other possible implementations, since the outer boundary of the boot-up screen coincides with the inner boundary of the frame of the projection screen when the boot-up screen does not exceed the projection screen, the position of each feature pattern in the boot-up screen may also be determined as the initial position of each feature pattern on the projection screen.
In the application, the laser projection equipment determines the target projection positions of all characteristic patterns of the starting picture on the projection screen according to the shot image, namely: the actual position of the feature pattern on the projection screen. Therefore, whether the starting picture in the shot image exceeds the frame of the projection screen can be determined through the difference between the target projection position and the initial position of the feature pattern on the projection screen.
The manner in which the laser projection device determines the target projection position of each feature pattern on the projection screen will be described in detail later, and will not be described here.
And step B1, if the starting picture in the shot image is detected to exceed the frame of the projection screen, determining that the projection image to be displayed needs to be corrected.
In the embodiment of the application, if the laser projection device detects that the starting picture in the shot image exceeds the frame of the projection screen, the laser projection device determines that the projection image to be displayed needs to be corrected.
For example, when the boot-up picture in the shot image exceeds the frame of the projection screen, it is indicated that the boot-up picture projected by the laser projection device to the projection screen exceeds the projection screen, in order to ensure that the display effect of the projection image projected by the subsequent laser projection device to the projection screen is better, the laser projection device needs to correct the projection image to be displayed, and at this time, the laser projection device needs to execute step 304 described below.
And step C1, if the starting picture in the shot image is detected to be not beyond the frame of the projection screen, determining that the projection image to be displayed does not need correction processing.
In the embodiment of the application, if the laser projection device detects that the starting picture in the shot image does not exceed the frame of the projection screen, the laser projection device determines that the projection image to be displayed does not need correction processing.
For example, when the starting-up picture in the shot image does not exceed the frame of the projection screen, it is indicated that the starting-up picture projected by the laser projection device to the projection screen does not exceed the projection screen, the display effect of the picture presented on the projection screen is better, the laser projection device does not need to correct the projected image to be displayed, and at this time, the laser projection device needs to execute the following step 305.
In a second alternative implementation manner, the detecting, by the laser projection device, whether the image to be displayed needs to be corrected according to the captured image may include:
and A2, detecting whether the characteristic graph of the starting picture in the shot image is deformed or not according to the shot image.
In the embodiment of the application, since the shot image can contain the startup picture, the laser projection equipment can detect whether the startup picture in the shot image is deformed or not. For example, if the laser projection device detects that the feature pattern of the startup picture in the shot image is deformed, executing the step B2; and if the laser projection equipment detects that the feature of the starting picture in the shot image is not deformed, executing the step B3.
In the application, if the laser projection device projects the startup picture to the projection screen, the shape of the characteristic graph of the startup picture presented on the projection screen is consistent with the shape of the characteristic graph of the startup picture, namely, the characteristic graph of the startup picture presented on the projection screen cannot be deformed. If the laser projection device is inclined relative to the projection screen, after the laser projection device projects the boot image to the projection screen, the shape of the feature image of the boot image presented on the projection screen is inconsistent with the shape of the feature image of the boot image, that is, the feature image of the boot image presented on the projection screen is deformed.
For this reason, the laser projection apparatus can determine whether the shape of the feature pattern is deformed after recognizing the shape of the pattern of each feature in the captured image.
By way of example, the color of the feature pattern in the boot-up picture is different from the background color. Therefore, the laser projection device can determine and distinguish the characteristic pattern from the photographed image according to the gray value of the photographed pattern, and can determine the shape of the characteristic pattern.
In order to facilitate the laser projection device to check whether the shape of the feature pattern in the startup picture changes, the shape of the feature pattern of the startup picture projected by the laser projection device may be set to a shape with more obvious deformation. For example, the shape of the feature pattern may be diamond or five-pointed star, etc.
And step B2, if deformation of the characteristic pattern is detected, determining that the projection image to be displayed needs correction processing.
In the embodiment of the application, if the laser projection device detects that the characteristic pattern in the shooting image is deformed, the laser projection device determines that the projection image to be displayed needs to be corrected.
For example, when the feature pattern of the boot-strap picture in the shot image is deformed, which indicates that the laser projection device is tilted relative to the projection screen, in order to ensure that the display effect of the projection image projected by the subsequent laser projection device onto the projection screen is better, the laser projection device needs to perform correction processing on the projection image to be displayed, and at this time, the laser projection device needs to execute step 304 described below.
And C2, if the characteristic graph is detected to be not deformed, determining that the projection image to be displayed does not need correction processing.
In the embodiment of the application, if the laser projection device detects that the characteristic graph in the shooting image is not deformed, the laser projection device determines that the projection image to be displayed does not need correction processing.
For example, when the feature pattern of the boot-up picture in the shot image is not deformed, which means that the display effect of the boot-up picture projected by the laser projection device to the projection screen is better, the laser projection device does not need to perform correction processing on the projected image to be displayed, and at this time, the laser projection device needs to execute the following step 305.
In a third alternative implementation manner, the laser projection device may detect whether the startup picture in the shot image exceeds the frame of the projection screen at the same time, and detect whether the feature pattern of the startup picture in the shot image is deformed. For example, if the laser projection device detects that the starting-up picture in the shot image exceeds the frame of the projection screen and detects that the feature pattern of the starting-up picture in the shot image is deformed, the laser projection device determines that the projection pattern to be displayed needs to be corrected, and at this time, the following step 304 needs to be executed; otherwise, the laser projection device determines that the projected pattern to be displayed does not need to be subjected to correction processing, at which time the following step 305 needs to be performed.
And 304, if the projection image to be displayed is detected to need to be corrected according to the shooting image, correcting the projection image to be displayed based on the characteristic graph in the shooting image.
In the embodiment of the application, if the laser projection device detects that the projection image to be displayed needs to be corrected according to the shot image, the laser projection device can correct the projection image to be displayed based on the characteristic graph in the shot image.
For example, the laser projection device may determine correction parameters based on feature patterns in the captured image, and correct the projected image to be displayed based on the correction parameters.
Wherein the correction parameters may include: and correcting positions of a plurality of vertexes in the projection image to be displayed in the first image coordinate system. If the projected image to be displayed is a quadrilateral, the vertices of the projected image to be displayed may include an upper left vertex, a lower left vertex, an upper right vertex, and a lower right vertex.
The following describes a process for determining, by a laser projection device, a correction position of a target vertex in a first image coordinate system in a projected image to be displayed, where the target vertex may be any vertex of the projected image to be displayed:
first, the laser projection device may determine a target projection position of the target feature pattern in the projection screen according to the perspective transformation coefficient of the camera and the position of the target feature pattern in the captured image. The target feature pattern may be a feature pattern closest to a projection position of the target vertex among the feature patterns. For example, assuming that the target vertex of the projection image to be displayed is an upper right vertex, the target feature pattern may be a feature pattern located in an upper right corner among the plurality of feature patterns. For example, referring to fig. 4, the target feature pattern may be the feature pattern 02 in the upper right corner of the boot-strap screen.
Wherein the perspective transformation coefficient is capable of transforming the position of any point in the projection screen to a position in the captured image, i.e. the perspective transformation coefficient is a coefficient of variation between the screen coordinate system of the projection screen and the second image coordinate system of the captured image. The perspective transformation coefficient is related to the shooting position of the camera, the distance between the camera and the projection screen, and the resolution of the camera.
The laser projection device may then determine an actual relative position between the position of the target vertex of the bezel of the projection screen and the target projection position, and may determine an initial relative position of the target vertex of the bezel and the initial projection position of the target feature pattern. The laser projection device may then determine a target offset based on the actual relative position and the initial relative position. The target offset is the offset of the target vertex of the starting picture at the target projection position of the projection screen relative to the initial projection position of the projection screen. It is understood that the target offset may be a vector including an offset direction and an offset value magnitude.
And when the starting picture does not exceed the projection screen, the initial projection position of the target feature graph is the projection position of the target feature graph in the projection screen. The target vertex of the frame of the projection screen may be a vertex of the plurality of vertices of the frame that is in the same orientation as the target vertex in the projected image to be displayed. The target vertex of the starting-up picture is the vertex which is in the same azimuth with the target vertex in the projection image to be displayed in a plurality of vertexes of the starting-up picture. For example, if the target vertex in the projected image to be displayed is the top right vertex of the projected image to be displayed, the target vertex of the frame is the top right vertex of the frame, and the target vertex of the startup picture is the top right vertex of the startup picture.
Further, the laser projection device may determine, based on the target offset, a pixel offset of a target vertex of the projection image to be displayed in the first image coordinate system from a pre-stored correspondence, so that a correction position of the target vertex of the projection image to be displayed in the first image coordinate system may be determined according to the pixel offset and an initial position of the target vertex of the projection image to be displayed in the first image coordinate system.
The pixel offset may be a vector including an offset direction and an offset value. The correspondence is that of an offset in the screen coordinate system with an offset in the first image coordinate system.
Based on the method, the laser projection device can determine the correction position of each vertex in the projection image to be displayed in the first image coordinate system, and can correct the projection image to be displayed according to the correction position of each vertex in the projection image to be displayed in the first image coordinate system, so as to obtain the projection image after correction.
In the embodiment of the application, after the laser projection equipment corrects the projection image to be displayed, when the laser projection equipment projects the corrected projection image to the projection screen, the corrected projection image does not exceed the projection screen, and the corrected image presented on the projection screen does not deform. And, the laser projection device also needs to continue to perform the power-on operation.
Step 305, if it is detected that the projected image to be displayed does not need to be corrected according to the captured image, the start-up operation is continuously performed.
In the embodiment of the application, if the laser projection equipment detects that the projection image to be displayed does not need to be corrected according to the shot image, the laser projection equipment continues to execute the starting operation, so that each functional module in the laser projection equipment can complete the initialization process, and each functional module can be ensured to work normally.
It should be noted that, the sequence of the steps of the starting method of the laser projection device provided in the embodiment of the present application may be appropriately adjusted, the steps may also be increased or decreased according to the situation, and any method that is easily conceivable to be changed by those skilled in the art within the technical scope of the disclosure of the present application should be covered within the protection scope of the present application, so that the description is omitted.
In summary, according to the startup method of the laser projection device provided by the embodiment of the application, the laser projection device can project the startup picture with a plurality of characteristic patterns to the projection screen in the startup process. Thus, after the laser projection device obtains the shooting image of the camera shooting the projection screen, the projection picture to be displayed can be corrected based on the characteristic graph in the shooting image. After the laser projection device projects the corrected projection image to the projection screen, the corrected projection image cannot exceed the projection screen, and the good display effect of the projection image displayed on the projection screen can be ensured. The correction instruction is not required to be manually triggered by a user, the laser projection equipment can realize the correction process of the projection image to be displayed, the correction process of the projection image to be displayed by the laser projection equipment can be hidden in the starting-up process of the laser projection equipment, the interaction process of the user and the laser projection equipment is simplified, the correction efficiency of the projection image to be displayed by the laser projection equipment is effectively improved, and the user experience is good.
The embodiment of the present application further provides a laser projection system, as shown in fig. 1, the laser projection system 100 may include: a laser projection device 101, a camera 102 and a projection screen 103.
Wherein the laser projection device 101 is configured to: in response to the start-up instruction, after the laser projection device 101 is powered up, projecting a start-up picture with a plurality of feature patterns to the projection screen 103; acquiring a shooting image obtained by shooting the projection screen 103 by the camera 102; and if the projection image to be displayed is detected to need to be subjected to correction processing according to the shooting image, correcting the projection image to be displayed based on the characteristic graph in the shooting image.
Alternatively, the laser projection device 101 is configured to: detecting whether a starting picture in the shot image exceeds the frame of the projection screen according to the shot image; if the starting picture in the shot image is detected to exceed the frame of the projection screen, determining that the projection image to be displayed needs to be subjected to correction processing.
Alternatively, the laser projection device 101 is configured to: determining the outline of the frame of the projection screen and the outline of the starting picture in the shot image; if the region surrounded by the outline of the starting-up picture is detected to be at least partially outside the region surrounded by the outline of the frame of the projection screen, the starting-up picture in the shooting image is determined to exceed the frame of the projection screen.
Alternatively, the laser projection device 101 is configured to: determining target projection positions of all feature patterns of the starting picture on a projection screen according to the shot images; if the deviation between the target projection position of the feature pattern on the projection screen and the initial position of the feature pattern on the projection screen is detected to be larger than a preset value, determining that a starting picture in the shot image exceeds the frame of the projection screen.
Alternatively, the laser projection device 101 is configured to: detecting whether the characteristic graph of a starting picture in the shot image is deformed or not according to the shot image; if the deformation of the characteristic pattern is detected, determining that the projection image to be displayed needs to be corrected.
Optionally, the laser projection device 101 is further configured to: after correcting the projection image to be displayed based on the characteristic graph in the shooting image, continuing to execute starting operation; or if the projection image to be displayed is detected to be free from correction processing according to the shot image, starting operation is continuously executed.
Alternatively, the laser projection device 101 is configured to: correction parameters are determined based on the captured image, and the projection image to be displayed is corrected based on the correction parameters.
Optionally, the startup picture includes: a main picture, and a plurality of feature patterns surrounding the main picture.
Optionally, the color of each feature pattern is different from the background color of the region of the boot picture other than the main picture.
In summary, the laser projection system provided in the embodiment of the present application includes: laser projection device, camera and projection screen. The laser projection device can project a startup picture with a plurality of characteristic patterns to the projection screen in the startup process. Thus, after the laser projection device obtains the shooting image of the camera shooting the projection screen, the projection picture to be displayed can be corrected based on the characteristic graph in the shooting image. After the laser projection device projects the corrected projection image to the projection screen, the corrected projection image cannot exceed the projection screen, and the good display effect of the projection image displayed on the projection screen can be ensured. The correction instruction is not required to be manually triggered by a user, the laser projection equipment can realize the correction process of the projection image to be displayed, the correction process of the projection image to be displayed by the laser projection equipment can be hidden in the starting-up process of the laser projection equipment, the interaction process of the user and the laser projection equipment is simplified, the correction efficiency of the projection image to be displayed by the laser projection equipment is effectively improved, and the user experience is good.
The present application also provides a laser projection apparatus, which may include: the system comprises a processor and a memory, wherein at least one instruction is stored in the memory, and the instruction is loaded and executed by the processor to realize the starting method of the laser projection device shown in fig. 2 or 3.
The embodiment of the application also provides a computer readable storage medium. The computer readable storage medium has instructions stored therein that, when executed on a processing component, cause the processing component to perform a power-on method of implementing the laser projection device shown in fig. 2 or 3.
In the present disclosure, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" refers to two or more, unless explicitly defined otherwise.
The foregoing description of the preferred embodiments of the present application is not intended to limit the application, but is intended to cover all modifications, equivalents, alternatives, and improvements falling within the spirit and principles of the application.
Claims (9)
1. A method for powering on a laser projection device, the method comprising:
and responding to a starting instruction, and after the laser projection equipment is powered on, projecting a starting picture with a plurality of characteristic patterns to a projection screen, wherein the starting picture comprises the following components: a main picture and a plurality of feature graphics surrounding the periphery of the main picture, wherein the main picture is a starting animation or a brand icon;
acquiring a shooting image obtained by shooting the projection screen by a camera;
and if the projection image to be displayed is detected to need to be corrected according to the shooting image, correcting the projection image to be displayed based on the characteristic graph in the shooting image.
2. The method according to claim 1, wherein the method further comprises:
detecting whether a starting picture in the shot image exceeds the frame of a projection screen according to the shot image;
and if the starting picture in the shooting image is detected to exceed the frame of the projection screen, determining that the projection image to be displayed needs to be subjected to correction processing.
3. The method according to claim 2, wherein the method further comprises:
determining the outline of the frame of the projection screen and the outline of the starting picture in the shot image;
and if the region surrounded by the outline of the starting picture is detected to be at least partially outside the region surrounded by the outline of the frame of the projection screen, determining that the starting picture in the shooting image exceeds the frame of the projection screen.
4. The method according to claim 2, wherein the method further comprises:
determining target projection positions of all feature patterns of the starting picture on the projection screen according to the shot images;
and if the deviation between the target projection position of the characteristic pattern on the projection screen and the initial position of the characteristic pattern on the projection screen is detected to be larger than a preset value, determining that a starting picture in the shot image exceeds the frame of the projection screen.
5. The method according to claim 1, wherein the method further comprises:
detecting whether a characteristic figure of a starting picture in the shooting image is deformed or not according to the shooting image;
and if the deformation of the characteristic graph is detected, determining that the projection image to be displayed needs to be subjected to correction processing.
6. The method according to any one of claims 1 to 5, further comprising:
after correcting the projection image to be displayed based on the characteristic graph in the shooting image, continuing to execute starting operation;
or if the projection image to be displayed is detected to be free from correction processing according to the shooting image, starting operation is continuously executed.
7. The method according to any one of claims 1 to 5, wherein correcting the projected image to be displayed based on the feature pattern in the captured image includes:
and determining a correction parameter based on the characteristic graph in the shooting image, and correcting the projection image to be displayed based on the correction parameter.
8. The method of claim 1, wherein each of the feature patterns has a color different from a background color of an area of the starting-up picture other than the main picture.
9. A laser projection system, comprising: the device comprises a laser projection device, a projection screen and a camera; the laser projection device is used for:
and responding to a starting instruction, and after the laser projection equipment is powered on, projecting a starting picture with a plurality of characteristic patterns to the projection screen, wherein the starting picture comprises the following components: a main picture and a plurality of feature graphics surrounding the periphery of the main picture, wherein the main picture is a starting animation or a brand icon;
acquiring a shooting image obtained by shooting the projection screen by the camera;
and if the projection image to be displayed is detected to need to be corrected according to the shooting image, correcting the projection image to be displayed based on the characteristic graph in the shooting image.
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| CN202111560475.2A CN114268777B (en) | 2021-12-20 | 2021-12-20 | Starting method of laser projection equipment and laser projection system |
| PCT/CN2022/101830 WO2023071256A1 (en) | 2021-10-29 | 2022-06-28 | Laser projection device, and correction method for projected image |
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| WO2023071256A1 (en) * | 2021-10-29 | 2023-05-04 | 青岛海信激光显示股份有限公司 | Laser projection device, and correction method for projected image |
| CN114979600B (en) * | 2022-06-13 | 2024-04-26 | 青岛海信激光显示股份有限公司 | Laser projection apparatus and correction method of projection image |
| CN115348429A (en) * | 2022-06-30 | 2022-11-15 | 青岛海信激光显示股份有限公司 | Correction method of projection picture and laser projection system |
| CN116684561B (en) * | 2023-08-03 | 2023-11-24 | 深圳新智联软件有限公司 | Startup image adjusting method and device, electronic equipment and storage medium |
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