CN114979599B - Laser projection apparatus and correction method of projection image - Google Patents
Laser projection apparatus and correction method of projection image Download PDFInfo
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- 230000008569 process Effects 0.000 claims abstract description 23
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
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- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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Abstract
The application discloses laser projection equipment and a correction method of a projection image, and belongs to the technical field of electronics. The laser projection device may correct the display effect of the projected image according to the determined first transformation relation and the reference positions of the four vertices of the projected image in the second coordinate system. This ensures that the projection image is projected into the projection screen, and that the projection shape of the projection image is the same as the shape of the projection screen, thereby ensuring that the display effect of the projection image is good. Moreover, the laser projection equipment can carry out automatic geometric correction based on a user interaction interface included in the projection image without displaying a correction chart card for image correction, so that the perception of a user on the automatic geometric correction process is reduced, and the user experience is improved.
Description
Technical Field
The disclosure relates to the field of electronic technology, and in particular, to a laser projection device and a correction method for a projection image.
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 cover the top point of the projection screen, resulting in poor display effect of the displayed projected image.
Disclosure of Invention
The embodiment of the disclosure provides a laser projection device and a correction method of a projection image, which can solve the problem of poor display effect of the projection image under the condition that the laser projection device is deviated in the related art. The technical scheme is as follows:
in one aspect, there is provided a method of correcting a projection image, the method comprising:
acquiring a shooting image obtained by shooting a projection image in the process of projecting the projection image onto a projection screen, wherein the projection image covers four vertexes of the projection screen, the projection image comprises a user interaction interface, and the user interaction interface comprises a polygonal frame;
Determining a first transformation relationship between a first coordinate system and a second coordinate system of the polygonal frame according to a first target position of a plurality of first vertexes of the polygonal frame in the first coordinate system of the photographed image and a first initial position of the plurality of first vertexes in the second coordinate system of the projected image;
correcting the display effect of the projection image according to the first transformation relation and the reference positions of the four second vertexes of the projection image in the second coordinate system.
In another aspect, a laser projection device is provided for:
acquiring a shooting image obtained by shooting a projection image in the process of projecting the projection image onto a projection screen, wherein the projection image covers four vertexes of the projection screen, the projection image comprises a user interaction interface, and the user interaction interface comprises a polygonal frame;
Determining a first transformation relationship between a first coordinate system and a second coordinate system of the polygonal frame according to a first target position of a plurality of first vertexes of the polygonal frame in the first coordinate system of the photographed image and a first initial position of the plurality of first vertexes in the second coordinate system of the projected image;
correcting the display effect of the projection image according to the first transformation relation and the reference positions of the four second vertexes of the projection image in the second coordinate system.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that at least:
The embodiment of the disclosure provides a laser projection device and a correction method of a projection image, wherein the laser projection device can correct the display effect of the projection image according to the first transformation relation and the reference positions of four vertexes of the projection image in a second coordinate system. This ensures that the projection image is projected into the projection screen, and that the projection shape of the projection image is the same as the shape of the projection screen, thereby ensuring that the display effect of the projection image is good.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a flow chart of a method for correcting a projected image provided by an embodiment of the present disclosure;
FIG. 2 is a flow chart of another method of correcting a projected image provided by an embodiment of the present disclosure;
FIG. 3 is a schematic illustration of a projected image provided by an embodiment of the present disclosure;
FIG. 4 is a schematic illustration of another projected image provided by an embodiment of the present disclosure;
FIG. 5 is a schematic illustration of yet another projected image provided by an embodiment of the present disclosure;
FIG. 6 is a schematic illustration of yet another projected image provided by an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a second coordinate system provided by an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of a laser projection device according to an embodiment of the present disclosure;
FIG. 9 is a schematic diagram of another laser projection device provided in an embodiment of the present disclosure;
FIG. 10 is a schematic illustration of a projected image deformation provided by an embodiment of the present disclosure;
FIG. 11 is a schematic illustration of another projected image deformation provided by an embodiment of the present disclosure;
FIG. 12 is a schematic illustration of yet another projected image deformation provided by an embodiment of the present disclosure;
FIG. 13 is a schematic diagram of a calibration chart provided by an embodiment of the present disclosure;
fig. 14 is a schematic diagram of another calibration chart provided by an embodiment of the present disclosure.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
Fig. 1 is a flowchart of a correction method for a projected image according to an embodiment of the present disclosure, where the correction method may be applied to a laser projection device, and optionally, the laser projection device may be an ultra-short focal laser projection device or a mid-long focal laser projection device. As shown in fig. 1, the method includes:
step 101, acquiring a shooting image obtained by shooting the projection image in the process of projecting the projection image on a projection screen.
In the embodiment of the disclosure, the laser projection device may acquire a captured image obtained by capturing the projection image during the process of projecting the projection image onto the projection screen.
Wherein the projected image can cover four vertices of the projection screen, and the projected image can include a polygonal frame. The area of the polygonal frame is greater than an area threshold, i.e., the area of the polygonal frame is greater.
Alternatively, the projected image may include a user interaction interface, also known as a User Interface (UI). A polygonal box may be included in the user interaction interface.
Step 102, determining a first transformation relation between the first coordinate system and the second coordinate system according to a first target position of a plurality of first vertexes of the polygonal frame in the first coordinate system of the photographed image and a first initial position of the plurality of first vertexes in the second coordinate system of the projected image.
After the laser projection device acquires the shot image, a first transformation relationship between the first coordinate system and the second coordinate system can be determined according to a first target position of a plurality of first vertexes of the polygonal frame in the first coordinate system of the shot image and a first initial position of the plurality of first vertexes in the second coordinate system of the projection image. The laser projection device may have a plurality of first initial positions of the first vertices stored therein in advance.
And step 103, correcting the display effect of the projection image according to the first transformation relation and the reference positions of the four second vertexes of the projection image in the second coordinate system.
After determining the first transformation relation between the first coordinate system and the second coordinate system, the laser projection device may correct the display effect of the projection image according to the first transformation relation and the reference positions of the four second vertices of the projection image in the second coordinate system. The laser projection device may have four reference positions of the second vertices stored therein in advance.
The display effect of the projection image may include a projection position of the projection image on the projection screen and/or a projection shape of the projection image on the projection screen. The projection position of the corrected projection image is positioned in the projection screen, and the projection shape of the projection image is the same as the shape of the projection screen. Wherein, the projection position of the projection image being located in the projection screen means that the projection positions of all pixels in the projection image are located in the projection screen, and the projection positions of the edge pixels of the projection image are aligned with the edges of the projection area of the projection screen. The edge pixels of the projected image refer to pixels located in the outermost peripheral region of the projected image.
In summary, the embodiments of the present disclosure provide a correction method for a projection image, where a laser projection device may correct a display effect of the projection image according to determining a first transformation relationship and reference positions of four vertices of the projection image in a second coordinate system. This ensures that the projection image is projected into the projection screen, and that the projection shape of the projection image is the same as the shape of the projection screen, thereby ensuring that the display effect of the projection image is good.
In addition, the laser projection equipment can carry out automatic geometric correction based on a user interaction interface included in the projection image without displaying a correction chart card for image correction, so that the perception of a user on the automatic geometric correction process is reduced, the noninductive correction is realized, and the user experience is improved.
Fig. 2 is a flowchart of another method for correcting a projected image according to an embodiment of the present disclosure, where the method may be applied to a laser projection device, which may be an ultra-short focal laser projection device or a mid-long focal laser projection device. As shown in fig. 2, the method may include:
step 201, acquiring a shooting image obtained by shooting the projection image in the process of projecting the projection image on the projection screen.
In the embodiment of the disclosure, the laser projection device may acquire a captured image obtained by capturing the projection image during the process of projecting the projection image onto the projection screen.
Wherein the projected image can cover four vertices of the projection screen, and the projected image can include a polygonal frame. The area of the polygonal frame is greater than an area threshold, i.e., the area of the polygonal frame is greater.
The polygon may be a pattern surrounded by at least four vertices. For example, the polygon may be a quadrilateral or a hexagon. Alternatively, the polygonal frame may have the same shape as the projection screen. For example, the polygonal frame and the projection screen may each be rectangular in shape, i.e., each polygonal frame may be a rectangular frame.
In embodiments of the present disclosure, the projected image may include a user interaction interface, which may also be referred to as a User Interface (UI). The user interaction interface can comprise a plurality of polygonal frames and a plurality of polygonal interaction controls, wherein the polygonal frames can be frames of the interaction controls.
Alternatively, the projected image may be a user interaction interface, i.e. the projected image does not comprise a multimedia signal or a video signal. For example, referring to fig. 3, 4, and 5, the projected image may be the main interface. Or referring to fig. 6, the projected image may select an interface for a video source.
Or the projected image may comprise one of a multimedia signal and a video signal, and a user interaction interface. Therefore, in the image correction process, the user can watch the multimedia signal or the video signal, so that normal watching of the user is not influenced, and the user experience is good. For example, the user interaction interface may also be a channel selection interface, and the user may select a television channel while watching the multimedia signal, thereby enabling the laser projection device to display the channel selection interface while playing the multimedia signal.
The laser projection device may display the projected image in response to a power-on command, and referring to fig. 3, 4, and 5, the projected image may be a main interface.
Or the laser projection device may display the projected image in response to a video source switching instruction, referring to fig. 6, the projected image may select an interface for the video source. The video source switching instruction may be generated according to a selected operation of a video source switching button on the remote controller. The remote control may be a remote control for controlling the laser projection device.
Or the laser projection device may display the projected image, which may be the main interface with reference to fig. 3, 4 and 5, in response to a display instruction for the user-interactive interface. The display instruction for the user interaction interface can be generated according to the selection operation of the main interface display button on the remote controller.
Referring to fig. 3, 4 and 5, the projected image 01 may further include a plurality of interactive buttons 001 and a view sub-interface 002. Wherein the interactive button 001 is a button for interacting with a user, which may also be referred to as a control, and the size of the interactive button is smaller than the size of the interactive control. The view sub-interface 002 is an interface for displaying interactive controls. By way of example, the names of the plurality of interactive buttons 001 may include "my", "channel", "movie", "education", "shopping", and "application".
Wherein each interactive button may correspond to a plurality of polygonal frames. The laser projection device may display a plurality of polygonal boxes corresponding to the interactive buttons in the view sub-interface after receiving a selection operation for a target interactive button of the plurality of interactive buttons. The number of the multiple polygonal frames corresponding to the different interactive buttons can be the same or different, and the arrangement modes of the multiple polygonal frames corresponding to the different interactive buttons can be the same or different.
Referring to fig. 3, upon receiving a selection operation for a target interactive button 001 named "movie", the laser projection apparatus may display 4 polygonal frames 003 corresponding to the target interactive button 001 named "movie" in the view sub-interface 002, the polygonal frames 003 being rectangular in shape.
Referring to fig. 4, upon receiving a selection operation for the target interactive button 001 named "my", the laser projection apparatus may display 10 polygonal frames 003 corresponding to the target interactive button 001 named "my" in the view sub-interface 002, the polygonal frames 003 being rectangular in shape.
Referring to fig. 5, upon receiving a selection operation for a target interactive button 001 named "channel", the laser projection apparatus may display 6 polygonal frames 003 corresponding to the target interactive button 001 named "channel" in the view sub-interface 002, the polygonal frames 003 being rectangular in shape.
The introduction information can be displayed in each polygonal frame, and the laser projection device can periodically update the introduction information in the polygonal frame. The laser projection device may display a page corresponding to the introduction information in response to a selected operation of the interactive control for the polygonal frame.
For example, referring to fig. 3, the introduction information displayed in the polygonal frame 003 may be a poster of a movie, and the laser projection device may display a playing page of the movie after receiving a selection operation of the interaction control for the polygonal frame. Referring to fig. 4, the introduction information displayed in the polygonal frame 003 may include the text information "immediately login" and a login icon.
Referring to fig. 6, the projection image 01 may include a plurality of quadrangular frames, each of which may have a name of one video source displayed therein, for example, the name of the one video source may be the first video source.
It will be appreciated that if the user moves the laser projection device inadvertently, the projected image projected by the laser projection device onto the projection screen will cover four vertices of the projection screen and the projected image displayed may be distorted. For example, a projected image projected onto a projection screen may undergo trapezoidal deformation.
In an optional implementation manner of the embodiment of the disclosure, in a process of projecting a projection image onto a projection screen by a laser projection device, a user may shoot the projection image by using a shooting device to obtain a shooting image, and control the shooting device to send the shooting image to the laser projection device. Wherein the photographing apparatus is independently provided with the laser projection apparatus. The photographing apparatus may be a mobile terminal provided with a camera, for example, the photographing apparatus may be a mobile phone.
In another optional implementation manner of the embodiment of the disclosure, the laser projection device may obtain, in response to the correction instruction, a captured image obtained by capturing the projection image during the process of projecting the projection image onto the projection screen.
The user may trigger a correction instruction during the projection display of the projected image by the laser projection device. The correction instruction may be generated for a click operation of the correction button. The correction button may be provided on both the laser projection device and a remote controller for controlling the laser projection device. Or the laser projection device may periodically generate correction instructions during the display of the projected image. That is, the laser projection device may periodically perform the correction flow.
In the embodiment of the disclosure, the shooting device can be arranged on a laser projection device, and the shooting device is connected with the laser projection device by means of a universal serial bus (universal serial bus, USB). Alternatively, the photographing apparatus may be a camera. The laser projection device may send a photographing instruction to the photographing device in response to the correction instruction. The photographing device may photograph the projection image in response to the photographing instruction to obtain a photographed image, and transmit the photographed image to the laser projection device.
In the embodiment of the disclosure, the image acquisition range of the photographing device is larger than the projection range of the laser projection device, that is, the photographing device can photograph a projection screen and a projection image. The embodiment of the present disclosure does not limit the setting position of the photographing apparatus.
Step 202, determining a second transformation relation according to a second target position of a plurality of third vertexes of the projection screen in the first coordinate system of the shot image and a second projection position of the third vertexes of the projection screen in the third coordinate system of the projection screen.
After the laser projection device acquires the captured image, a second target position of a plurality of third vertices of the projection screen in a first coordinate system of the captured image may be determined, and a second transformation relationship between the first coordinate system and the third coordinate system may be determined according to a second target position of the plurality of third vertices of the projection screen in the first coordinate system of the captured image and a second projection position of the plurality of third vertices in the third coordinate system of the projection screen.
The second projection positions of the third vertexes of the projection screen in the third coordinate system of the projection screen are fixed positions stored in the laser projection device in advance. The second transformation relationship between the first coordinate system and the third coordinate system is a transformation relationship that converts a position in the captured image into a projection position in the projection screen. The second transformation relationship is related to a target position of the photographing apparatus, a distance of the photographing apparatus from the projection screen, and a resolution of the photographing apparatus.
The origin of the first coordinate system of the photographed image may be a reference point of the photographed image, and the reference point may be a center point of the photographed image. The horizontal axis of the first coordinate system is parallel to the pixel row direction of the photographed image, and the vertical axis of the first coordinate system is parallel to the pixel column direction of the photographed image.
The origin of the third coordinate system of the projection screen may be a reference point of the projection screen, and the reference point may be a center point of the projection screen. The horizontal axis of the first coordinate system is parallel to the pixel row direction of the projection screen, and the vertical axis of the first coordinate system is parallel to the pixel column direction of the projection screen. Alternatively, the resolution of the projection screen may be m×n, where M is the number of rows of pixels in the projection screen, N is the number of columns of pixels in the projection screen, M and N are integers greater than 1, and by way of example, M may be 2160 and N may be 3840.
In an embodiment of the present disclosure, the second target positions (a, b) of the third vertices having the second projection positions (x, y) in the first coordinate system among the plurality of third vertices may satisfy:
Wherein, the K is a first perspective transformation matrix, and the first perspective transformation matrix K may satisfy: The first perspective transformation matrix K may include K0 to K7 perspective transformation coefficients, w being a linear parameter. The second transformation relationship Q may be wxk -1, and the K -1 is an inverse of the first perspective transformation matrix K. The inverse matrix K -1 of the first perspective transformation matrix K may be a 3×3 matrix, and the second transformation relationship Q may satisfy: /(I) The method comprises
In an embodiment of the present disclosure, the projection screen may include four third vertices, an upper left vertex, an upper right vertex, a lower left vertex, and a lower right vertex. Based on the above formula that the second target positions of the third vertices in the first coordinate system satisfy, it may be determined that the second target positions of the four third vertices, the second projection positions of the four third vertices, and the first perspective transformation matrix K satisfy:
Based on this, the laser projection apparatus can determine 8 equations in total of the following equations (1) to (8), and can determine K0 to K7 perspective transformation coefficients included in the first perspective transformation matrix K by solving the 8 equations.
Equation (1): a1 =k0×x1+k1×y1+k2-k6×x1×a1-k7×y1×a1;
equation (2): b1 =k3×x1+k4×y1+k5-k6×x1×b1-k7×y1×b1;
equation (3): a2 =k0×x2+k1×y2+k2-k6×x2×a2-k7×y2×a2;
equation (4): b2 =k3×x2+k4×y2+k5-k6×x2×b2-k7×y2×b2;
equation (5): a3 =k0×x3+k1×y3+k2-k6×x3×a3-k7×y3×a3;
equation (6): b3 =k3×x3+k4×y3+k5-k6×x3×b3-k7×y3×b3;
Equation (7): a4 =k0×x4+k1×y4+k2-k6×x4×a4-k7×y4×a4;
Equation (8): b4 =k3×x4+k4×y4+k5-k6×x4×b4-k7×y4×b4.
The position of each third vertex is determined by two coordinates, the second target position of the upper left vertex in the plurality of third vertices is (a 1, b 1), and the second projection position of the upper left vertex is (x 1, y 1). The second target position of the upper right vertex of the plurality of third vertices is (a 2, b 2), and the second projection position of the upper right vertex is (x 2, y 2). The second target position of the lower right vertex of the plurality of third vertices is (a 3, b 3), and the second projection position of the lower right vertex is (x 3, y 3). The second target position of the lower left vertex of the plurality of third vertices is (a 2, b 2), and the second projection position of the lower left vertex is (x 4, y 4).
In the embodiment of the disclosure, after the laser projection device acquires the shot image, the shot image may be subjected to gray processing to obtain a gray image. Then, the laser projection device may determine the second target positions of the plurality of third vertices of the captured image according to the gray value of each pixel in the gray image.
Wherein the gray value range of each pixel in the gray image may be 0, 255. Wherein, the pixel with gray value of 0 appears black in the gray image, and the pixel with gray value of 255 appears white in the gray image.
In embodiments of the present disclosure, the projection screen may include a bezel and a projection area located inside the bezel. The third vertex of the projection screen may be a vertex of a bezel of the projection screen. And the frame of the projection screen may be black.
Because the frame of the projection screen is black, the laser projection device can identify a plurality of edge lines of the projection screen in the shot image by adopting a corner detection algorithm, and then the laser projection device can determine a pixel point at which any two edge lines intersect as a third vertex of the projection screen. The edge lines form the frame of the projection screen. The corner detection algorithm may include, for example, harris corner detection algorithm, KLT corner detection algorithm, SUSAN corner detection algorithm, and the like.
Alternatively, after determining a plurality of edge lines of the projection screen, the laser projection device may sequentially traverse the pixel points on the plurality of edge lines, and determine the pixel points on any two edge lines with the same position as the third vertex.
Step 203, for each first vertex of the polygon frame, determining a first projection position of the first vertex in the third coordinate system according to a first target position of the first vertex in the first coordinate system and the second transformation relationship.
After determining the second transformation relationship, the laser projection device may determine, for each first vertex of the polygonal frame, a first projection position of the first vertex in the third coordinate system based on a first target position of the first vertex in the first coordinate system and the second transformation relationship between the first coordinate system and the third coordinate system.
The shape of the polygon frame is the same as that of the projection screen, and the first projection position (X, Y) of the first vertex with the first target position (a, B) in the polygon frame in the third coordinate system of the projection screen may satisfy: x=t 11×w×A+t12×w×B+t13×w;Y＝t21×w×A+t22×w×B+t23 ×w.
Wherein, the w satisfies: t ij is a parameter of the ith row and the jth column in the inverse matrix K -1, and i and j are positive integers less than or equal to 3.
In an embodiment of the present disclosure, if the projected image includes a plurality of polygon frames, for each third vertex of the projection screen, the laser projection device may determine a target polygon frame corresponding to the third vertex from the plurality of polygon frames. And the laser projection device can determine the first projection positions of the first vertexes in the target polygonal frame in the third coordinate system according to the first target position of the first vertexes of the target polygonal frame and the second transformation relation. The target polygon frame is a polygon frame, which is close to the third vertex relative to other polygon frames, of the plurality of polygon frames.
Since the first vertex of each polygonal frame does not need to be identified in the photographed image, and further the first projection position of the first vertex of each polygonal frame does not need to be determined, the efficiency of image correction is effectively improved.
The color of each polygonal frame may be black. The laser projection device may identify each polygon frame in the captured image, and for each third vertex, the laser projection device may determine a distance between the third vertex and the plurality of polygon frames, respectively, and determine a target polygon frame having a smallest distance to the third vertex. The distance between the third vertex and each polygon frame may be a distance between the second target position of the third vertex and the first projection position of the reference pixel point of each polygon frame, which may be, for example, a first vertex of the polygon frame.
Optionally, the laser projection device may determine an edge line of each polygonal frame by using a corner detection algorithm, and determine a pixel point where any two edge lines intersect as the first vertex.
If the projected image includes a polygon frame, the laser projection device may directly determine the polygon frame as the target polygon frame corresponding to each third vertex.
Step 204, determining a first transformation relation according to the first initial positions and the first projection positions of the plurality of first vertexes in the second coordinate system of the projection image.
After determining the first projection positions of the plurality of first vertices of the polygonal frame, the laser projection device may determine the first transformation relationship based on the first initial positions and the first projection positions of the plurality of first vertices in the second coordinate system of the projected image.
The laser projection device stores first initial positions of first vertexes of a plurality of polygonal frames corresponding to each interaction button and arrangement positions of the polygonal frames. Referring to fig. 3, the arrangement position of the one polygonal frame may be a first row and a first column of the plurality of polygonal frames.
Referring to fig. 7, the origin of the second coordinate system X2Y2 may be a reference point in the projection image 01, for example, the reference point O in the projection image 01 may be an upper left vertex in the projection image 01. The horizontal axis X2 of the second coordinate system X2Y2 is parallel to the pixel row direction of the projection image 01, and the vertical axis Y2 of the second coordinate system X2Y2 is parallel to the pixel column direction of the projection image 01.
If the projected image includes a plurality of polygonal boxes, the first transformation relationship may include a sub-transformation relationship for each third vertex in the projection screen. For a target rectangular frame corresponding to each third vertex of the projection screen, the laser projection device may determine a sub-transformation relationship of the third vertex based on a first target position of a plurality of first vertices of the target rectangular frame and a first initial position of the plurality of first vertices, thereby obtaining a sub-transformation relationship of each third vertex.
Optionally, for the target polygon frame corresponding to each third vertex, a first projection position (u, v) of a first vertex having a first initial position (z, s) in the third coordinate system among the plurality of first vertices of the target polygon frame may satisfy:
wherein, the H is a second perspective transformation matrix corresponding to the third vertex, and the second perspective transformation matrix H corresponding to the third vertex may satisfy: the second perspective transformation matrix H corresponding to the third vertex may include H0 to H7 perspective transformation coefficients, and g is a linear parameter corresponding to the third vertex. The sub-transformation relationship U of the third vertex may be gxh -1, and the H -1 is an inverse of the second perspective transformation matrix H corresponding to the third vertex. The inverse matrix H -1 may be a 3×3 matrix, and the sub-transformation relationship U of the third vertex may satisfy: /(I) The/>
In an embodiment of the present disclosure, the target polygon frame may include four first vertices, i.e., an upper left vertex, an upper right vertex, a lower left vertex, and a lower right vertex. Based on the formulas satisfied by the first projection positions of the four first vertexes in the third coordinate system, the first target positions of the four first vertexes, the first projection positions of the four first vertexes and the formulas satisfied by the second perspective transformation matrix can be determined, 8 equations can be determined, and 8 perspective transformation coefficients in total can be determined from H0 to H7 included in the second perspective transformation matrix H by solving the 8 equations. The process of determining the total of 8 perspective transformation coefficients from H0 to H7 included in the second perspective transformation matrix H may refer to the implementation process of determining the total of 8 perspective transformation coefficients from K0 to K7 included in the first perspective transformation matrix K in the above steps, which is not described again in the embodiments of the present disclosure.
The laser projection device may further store second initial positions of the first vertices of the plurality of target polygon frames of the plurality of third vertices corresponding to the plurality of interaction buttons. For the target polygon frame corresponding to each third vertex, the laser projection device may determine a second initial position of the first vertex of the target polygon frame corresponding to each third vertex based on the target interaction button.
In an embodiment of the present disclosure, for each third vertex, the laser projection device may further determine a first transformation relationship between the first coordinate system and the second coordinate system directly according to the first target positions of the plurality of first vertices of the target polygon frame corresponding to the third vertex and the first initial positions of the plurality of first vertices.
If the projected image includes a polygon frame, the laser projection device determines the polygon frame as a target polygon frame in step 203, and then may determine a first transformation relationship according to the first initial positions and the first projection positions of the first vertices of the target polygon frame. The first transformation relationship is a transformation relationship of each third vertex, that is, the first transformation relationships of the plurality of third vertices are the same. The process of determining the first transformation relationship may refer to the above-described implementation process of determining the sub-transformation relationship of the third vertex based on the first initial positions and the first projection positions of the plurality of first vertices of the target polygon frame in the case where the projection image includes a plurality of polygon frames. The embodiments of the present disclosure are not described herein.
Step 205, for each third vertex of the projection screen, determining a second initial position of the third vertex in the second coordinate system according to the first transformation relationship and the second projection position of the third vertex in the third coordinate system.
In an embodiment of the disclosure, after determining the first transformation relationship, the laser projection device may determine, for each third vertex of the projection screen, a second initial position of the third vertex in the second coordinate system according to the first transformation relationship and a second projection position of the third vertex in the third coordinate system.
If the projected image includes a plurality of polygon frames, for each third vertex of the projection screen, the laser projection device may determine a second initial position of the third vertex in the second coordinate system according to the sub-transformation relationship of the third vertex and a second projection position of the third vertex in the third coordinate system. Whereby the laser projection device can determine the position of the plurality of third vertices in the projected image.
Because the target polygon frames corresponding to different third vertexes are different, the sub-transformation relations determined by adopting different target polygon frames are different, and further, the second initial position of each third vertex is determined by adopting the sub-transformation relation of the third vertex, so that the accuracy of determining the second initial position of the third vertex is improved.
Wherein the first projection position in the projection screen is a third vertex of (U, V), and the first initial position (Z, S) in the third coordinate system of the projection image may satisfy: z=q 11×g×U+q12×g×V+q13×g;S＝q21×g×U+q22×g×V+q23 ×g.
Wherein g corresponding to the third vertex may satisfy: q ij is a parameter of the ith row and the jth column in the inverse matrix H -1 of the third vertex, where i and j are positive integers less than or equal to 3.
If the projection image includes a plurality of polygon frames, for each third vertex of the projection screen, the laser projection device may determine a second initial position of the third vertex in the second coordinate system according to the first transformation relationship and a second projection position of the third vertex in the third coordinate system. Whereby the laser projection device can determine the position of the plurality of third vertices in the projected image.
Step 206, correcting the display effect of the projection image according to the second initial positions of the four third vertexes of the projection screen and the reference positions of the four second vertexes of the projection image in the second coordinate system.
After determining the first transformation relation between the first coordinate system and the second coordinate system, the laser projection device may correct the display effect of the projection image according to the first transformation relation and the reference positions of the four second vertices of the projection image in the second coordinate system.
The laser projection device may have four reference positions of the second vertices stored therein in advance. The display effect of the projection image may include a projection position of the projection image on the projection screen and/or a projection shape of the projection image on the projection screen. The projection position of the corrected projection image is positioned in the projection screen, and the projection shape of the projection image is the same as the shape of the projection screen. Wherein, the projection position of the projection image being located in the projection screen means that the projection positions of all pixels in the projection image are located in the projection screen, and the projection positions of the edge pixels of the projection image are aligned with the edges of the projection area of the projection screen. The edge pixels of the projected image refer to pixels located in the outermost peripheral region of the projected image.
Alternatively, the laser projection device may determine correction data of the projection image according to the second initial positions of the four third vertices of the projection screen and the reference positions of the four second vertices of the projection image, and correct the display effect of the projection image according to the correction data.
The resolution of the projection image is the same as that of the projection screen, the projection image may include a plurality of correction areas arranged in an array, the correction data of the projection image may include offset parameters corresponding to the pixel areas one by one, for example, if the projection image may include 32×62 total 1984 pixel areas, the correction data may include 1984 offset parameters. The projection image may be divided into m1×n1 grids, each of which may include a plurality of pixels, i.e., each of which is a pixel region. Each pixel region may includeAnd M1 is a positive integer smaller than M, and N1 is a positive integer smaller than N.
For each of the four third vertices, the laser projection device may determine a first offset parameter for the third vertex based on a second initial position of the third vertex and a reference position of the second vertex in the projected image at a position corresponding to the third vertex. And a second offset parameter for each pixel region in the projected image may be determined based on the first offset parameter for the third vertex. Whereby four second offset parameters can be obtained for each pixel area. Then, for each pixel region, the laser projection device may determine a third offset parameter for the pixel region based on the four second offset parameters, thereby obtaining correction data. And the laser projection device can correct the projection position of each pixel region in the projection image based on the third offset parameter of the pixel region, thereby correcting the display effect of the projection image.
In the disclosed embodiment, referring to fig. 8 and 9, the laser projection device may include a host 10, a light source assembly 20 located inside the host 10, a light modulation assembly 30, and a projection lens 40. The host 10 is provided with a light outlet 101. The light source assembly 20 is used for emitting a laser beam and transmitting the laser beam to the light modulation assembly 30. The light source assembly 20 may include a laser light source and a light transmitting optic. The laser light source may be a three-color laser light source, a single-color laser light source, or a dual-color laser light source, which is not limited in the embodiments of the present disclosure. The laser light source is used for emitting laser beams, and the light transmission lens is used for transmitting the laser beams emitted by the laser light source to the light modulation assembly 30. The light modulation component 30 is used for modulating the received laser beam into an image beam, and transmitting the image beam to the projection lens 40. The projection lens 40 is used for transmitting the image beam to a projection screen through the light outlet 101 so as to display a projection image.
Alternatively, the light modulation assembly 30 may be a digital micro-mirror device (DMD), a liquid-crystal CRYSTAL DISPLAY (LCD), or a liquid-crystal-on-silicon (liquid crystal on silicon, LCOS) device.
Referring to fig. 10 and 11, after the laser projection device is displaced, the projection image 01 covers the projection screen 02, and the projection image 01 is deformed in a trapezoid. Referring to fig. 12, after a large distortion occurs in the projection lens of the laser projection apparatus, the projection image 01 covers the projection screen 02, and there is deformation of the edge of the projection image 01.
By adopting the method provided by the embodiment of the disclosure, even if the projection lens of the laser projection device is greatly distorted or the laser projection device is displaced, the laser projection device can ensure that the projection image is projected into the projection screen, the edge of the projection image is aligned with the edge of the projection area of the projection screen, and the projection image is not deformed, so that the display effect of the projection image is ensured.
In the related art, when the laser projection device is shifted, a correction chart card needs to be projected onto a projection screen, and the correction chart card is photographed to obtain a photographed image. Correction data is then determined based on the captured image, and the display effect of the projection image is corrected based on the correction data. Referring to fig. 13 and 14, the calibration chart includes a plurality of feature patterns, which may be cross-shaped or square.
However, in the process of determining the correction data, the user cannot normally watch the video, and the user experience is poor. And under the condition that the projection image is distorted, correction data cannot be determined by adopting the correction chart card.
By adopting the method provided by the embodiment of the disclosure, the laser projection equipment can perform automatic geometric correction based on the displayed user interaction interface, so that the perception of a user on the automatic geometric correction process is reduced, and the user experience is improved.
It should be noted that, the sequence of the steps of the method for correcting the projection image provided in the embodiment of the present disclosure may be appropriately adjusted, and the steps may be deleted according to circumstances. For example, step 202 may be deleted as appropriate. Any method that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered in the protection scope of the present disclosure, and thus will not be repeated.
In summary, the embodiments of the present disclosure provide a correction method for a projection image, where a laser projection device may correct a display effect of the projection image according to determining a first transformation relationship and reference positions of four vertices of the projection image in a second coordinate system. This ensures that the projection image is projected into the projection screen, and that the projection shape of the projection image is the same as the shape of the projection screen, thereby ensuring that the display effect of the projection image is good.
Moreover, the laser projection equipment can carry out automatic geometric correction based on a user interaction interface included in the projection image without displaying a correction chart card for image correction, so that the perception of a user on the automatic geometric correction process is reduced, and the user experience is improved.
Referring to fig. 11, the laser projection device 10 may further include a system-on-chip 50, a display control chip 60, and a photographing device 70. The system-in-chip 50 is connected to the photographing apparatus 70 and the display control chip 60, respectively.
In the embodiment of the present disclosure, the system-on-chip 50 is configured to perform the above-described processes of determining correction data in step 101, step 102, step 201 to step 205, and step 103 and step 206, and the system-on-chip 50 transmits the correction data to the display control chip 60 after determining the correction data. The display control chip 60 is used for correcting the display effect of the projection image based on the correction data.
The disclosed embodiments provide a laser projection apparatus, as shown in fig. 8 and 9, for:
And in the process of projecting the projection image to the projection screen, acquiring a shooting image obtained by shooting the projection image, wherein the projection image covers four vertexes of the projection screen, the projection image comprises a user interaction interface, and the user interaction interface comprises a polygonal frame.
A first transformation relationship between the first coordinate system and the second coordinate system is determined according to a first target position of a plurality of first vertexes of the polygonal frame in a first coordinate system of the photographed image and a first initial position of the plurality of first vertexes in a second coordinate system of the projected image.
And correcting the display effect of the projection image according to the first transformation relation and the reference positions of the four second vertexes of the projection image in the second coordinate system.
In summary, the embodiments of the present disclosure provide a laser projection device, which may correct a display effect of a projection image according to determining a first transformation relationship and reference positions of four vertices of the projection image in a second coordinate system. This ensures that the projection image is projected into the projection screen, and that the projection shape of the projection image is the same as the shape of the projection screen, thereby ensuring that the display effect of the projection image is good. Moreover, the laser projection equipment can carry out automatic geometric correction based on a user interaction interface included in the projection image without displaying a correction chart card for image correction, so that the perception of a user on the automatic geometric correction process is reduced, and the user experience is improved.
Optionally, the user interaction interface includes an interaction control, and the polygonal frame is a frame of the interaction control.
Optionally, the projected image comprises a plurality of polygonal boxes, and the first transformation relationship comprises a sub-transformation relationship for each third vertex in the projection screen.
Optionally, the laser projection device is configured to:
for each third vertex of the projection screen, a target polygon frame corresponding to the third vertex is determined from the plurality of polygon frames.
And determining a sub-transformation relation of the third vertex according to the first target positions of the first vertexes of the target polygonal frame and the first initial positions of the first vertexes.
Optionally, the target polygon frame is a polygon frame of the plurality of polygon frames that is closer to the third vertex than the other polygon frames.
Optionally, each polygonal frame is a rectangular frame.
Optionally, the laser projection device is configured to:
In response to a power-on instruction, a projected image is displayed.
Or in response to a video source switching instruction, display the projected image.
Or in response to a display instruction for the user interaction interface, displaying the projected image.
Optionally, the laser projection device is configured to:
for each first vertex of the polygonal frame, determining a first projection position of the first vertex in a third coordinate system according to a first target position of the first vertex and a second transformation relation between the first coordinate system and the third coordinate system of the projection screen.
A first transformation relationship is determined based on the first initial positions and the first projected positions of the plurality of first vertices.
Optionally, the laser projection device is configured to:
For each third vertex of the projection screen, determining a second initial position of the third vertex in the second coordinate system according to the first transformation relation and the second projection position of the third vertex in the third coordinate system.
And correcting the display effect of the projection image according to the second initial positions of the four third vertexes of the projection screen and the reference positions of the four second vertexes of the projection image in the second coordinate system.
Optionally, the laser projection device is further configured to:
And determining a second transformation relation according to the second target positions of the plurality of third vertexes of the projection screen in the first coordinate system and the second projection positions of the plurality of third vertexes in the third coordinate system.
In summary, the embodiments of the present disclosure provide a laser projection device, which may correct a display effect of a projection image according to determining a first transformation relationship and reference positions of four vertices of the projection image in a second coordinate system. This ensures that the projection image is projected into the projection screen, and that the projection shape of the projection image is the same as the shape of the projection screen, thereby ensuring that the display effect of the projection image is good.
The disclosed embodiments provide a laser projection apparatus including: a memory, a processor and a computer program stored on the memory, the processor implementing the method as shown in fig. 1 or fig. 2 when executing the computer program.
Embodiments of the present disclosure provide a computer readable storage medium having instructions stored therein that when executed by a processor implement a method as shown in fig. 1 or 2.
Embodiments of the present disclosure provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method shown in fig. 1 or fig. 2.
In the presently disclosed embodiments, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" in the embodiments of the present disclosure means two or more. The term "and/or" in the embodiments of the present disclosure is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone.
The foregoing description of the preferred embodiments of the present disclosure is provided for the purpose of illustration only, and is not intended to limit the disclosure to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and principles of the disclosure.
Claims (8)
1. A method of correcting a projected image, the method comprising:
acquiring a shooting image obtained by shooting a projection image in the process of projecting the projection image onto a projection screen, wherein the projection image covers four vertexes of the projection screen, the projection image comprises a user interaction interface, and the user interaction interface comprises a polygonal frame;
Determining a first transformation relationship between a first coordinate system and a second coordinate system of the polygonal frame according to a first target position of a plurality of first vertexes of the polygonal frame in the first coordinate system of the photographed image and a first initial position of the plurality of first vertexes in the second coordinate system of the projected image;
correcting the display effect of the projection image according to the first transformation relation and the reference positions of the four second vertexes of the projection image in the second coordinate system;
Wherein the projection image comprises a plurality of polygonal frames, the shape of each polygonal frame is the same as the shape of the projection screen, and the first transformation relationship comprises a sub-transformation relationship of each third vertex in the projection screen;
The determining a first transformation relationship between the first coordinate system and the second coordinate system includes:
For each third vertex of the projection screen, determining a target polygon frame corresponding to the third vertex from the plurality of polygon frames, the target polygon frame being a polygon frame of the plurality of polygon frames that is closer to the third vertex relative to other polygon frames;
And determining the sub-transformation relation of the third vertex according to the first target positions of the first vertexes of the target polygonal frame in the first coordinate system and the first initial positions of the first vertexes in the second coordinate system.
2. The method of claim 1, wherein the user interaction interface includes a plurality of interaction controls, and the plurality of polygonal boxes are a plurality of frames corresponding to a target interaction control of the plurality of interaction controls after receiving a selection operation for the target interaction control.
3. The method of claim 1 or 2, wherein each of the polygonal frames is a rectangular frame.
4. The method according to claim 1 or 2, characterized in that the method further comprises:
responding to a starting instruction, and displaying the projection image;
or responding to a video source switching instruction, and displaying the projection image;
Or displaying the projection image in response to a display instruction for the user interaction interface.
5. The method according to claim 1 or 2, wherein the determining a first transformation relation between the first coordinate system and the second coordinate system according to a first target position of the plurality of first vertices of the polygonal frame in the first coordinate system of the captured image and a first initial position of the plurality of first vertices in the second coordinate system of the projected image includes:
for each first vertex of the polygonal frame, determining a first projection position of the first vertex in a third coordinate system of the projection screen according to a first target position of the first vertex in the first coordinate system and a second transformation relation between the first coordinate system and the third coordinate system;
And determining the first transformation relation according to the first initial positions of the first vertexes in the second coordinate system, the first projection positions of the first vertexes in the third coordinate system and the second transformation relation.
6. The method of claim 5, wherein correcting the display effect of the projected image based on the first transformation relationship and the reference positions of the four second vertices of the projected image in the second coordinate system comprises:
For each third vertex of the projection screen, determining a second initial position of the third vertex in the second coordinate system according to the first transformation relation and a second projection position of the third vertex in the third coordinate system;
Correcting the display effect of the projection image according to the second initial positions of the four third vertexes of the projection screen in the second coordinate system and the reference positions of the four second vertexes of the projection image in the second coordinate system.
7. The method of claim 5, wherein the method further comprises:
And determining the second transformation relation according to the second target positions of the plurality of third vertexes of the projection screen in the first coordinate system and the second projection positions of the plurality of third vertexes in the third coordinate system.
8. A laser projection device, comprising a system-on-chip, a display control chip, and a photographing device, the system-on-chip configured to:
In the process of projecting a projection image onto a projection screen, acquiring a shooting image obtained by shooting the projection image by shooting equipment, wherein the projection image covers four vertexes of the projection screen, the projection image comprises a user interaction interface, and the user interaction interface comprises a polygonal frame;
Determining a first transformation relationship between a first coordinate system and a second coordinate system of the polygonal frame according to a first target position of a plurality of first vertexes of the polygonal frame in the first coordinate system of the photographed image and a first initial position of the plurality of first vertexes in the second coordinate system of the projected image;
according to the first transformation relation and the reference positions of the four second vertexes of the projection image in the second coordinate system, determining correction data of the projection image, and sending the correction data to the display control chip;
the display control chip is used for correcting the display effect of the projection image based on the correction data;
Wherein the projection image comprises a plurality of polygonal frames, the shape of each polygonal frame is the same as the shape of the projection screen, and the first transformation relationship comprises a sub-transformation relationship of each third vertex in the projection screen;
The system-on-chip determining a first transformation relationship between the first coordinate system and the second coordinate system, comprising:
For each third vertex of the projection screen, determining a target polygon frame corresponding to the third vertex from the plurality of polygon frames, the target polygon frame being a polygon frame of the plurality of polygon frames that is closer to the third vertex relative to other polygon frames;
And determining the sub-transformation relation of the third vertex according to the first target positions of the first vertexes of the target polygonal frame in the first coordinate system and the first initial positions of the first vertexes in the second coordinate system.
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| CN102611822A (en) * | 2012-03-14 | 2012-07-25 | 海信集团有限公司 | Projector and projection image rectifying method thereof |
| CN105979234A (en) * | 2016-06-13 | 2016-09-28 | Tcl集团股份有限公司 | Projection image correction method and projection device |
| CN114222100A (en) * | 2021-12-20 | 2022-03-22 | 青岛海信激光显示股份有限公司 | Projection image correction method and laser projection device |
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