WO2022206527A1 - Procédé de correction d'image de projection et dispositif de projection laser - Google Patents

Procédé de correction d'image de projection et dispositif de projection laser Download PDF

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Publication number
WO2022206527A1
WO2022206527A1 PCT/CN2022/082627 CN2022082627W WO2022206527A1 WO 2022206527 A1 WO2022206527 A1 WO 2022206527A1 CN 2022082627 W CN2022082627 W CN 2022082627W WO 2022206527 A1 WO2022206527 A1 WO 2022206527A1
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Prior art keywords
target
projection
projection position
initial
image
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PCT/CN2022/082627
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English (en)
Chinese (zh)
Inventor
张冬冬
唐甜甜
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青岛海信激光显示股份有限公司
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Publication of WO2022206527A1 publication Critical patent/WO2022206527A1/fr

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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]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3185—Geometric adjustment, e.g. keystone or convergence
    • 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]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources

Definitions

  • the present disclosure relates to the field of projection display, and in particular, to a correction method of a projected image and a laser projection device.
  • laser projection equipment can project and display projected images on a projection screen.
  • the projection lens of the laser projection device is distorted, the projected image projected and displayed by the laser projection device on the projection screen will be deformed, resulting in poor display effect of the displayed projected image.
  • a method for calibrating a projected image which is applied to a laser projection device, and the method includes:
  • a target image is displayed on the projection screen, and the target image includes a main picture and a plurality of characteristic graphics surrounding the main picture, and the color of each of the characteristic graphics is the same as the color of the target image except the main picture.
  • the background color of the area outside is different;
  • For each of the feature patterns determine the first target projection position of the feature pattern on the projection screen according to the perspective transformation coefficient of the camera and the shooting position of the feature pattern in the captured image;
  • the projection position of the projected image is corrected according to the first target projection position of the plurality of feature patterns and the second target projection position of the reference point.
  • a laser projection device for:
  • a target image is displayed on the projection screen, and the target image includes a main picture and a plurality of characteristic graphics surrounding the main picture, and the color of each of the characteristic graphics is the same as the color of the target image except the main picture.
  • the background color of the area outside is different;
  • For each of the feature patterns determine the first target projection position of the feature pattern on the projection screen according to the perspective transformation coefficient of the camera and the shooting position of the feature pattern in the captured image;
  • the projection position of the projected image is corrected according to the first target projection position of the plurality of feature patterns and the second target projection position of the reference point.
  • FIG. 1 is a flowchart of a method for correcting a projected image provided by an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a laser projection device provided by an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of a target image provided by an embodiment of the present disclosure.
  • FIG. 4 is a flowchart of a method for correcting a projected image provided by an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of a characteristic graph provided by an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of deformation of a projection image provided by the related art.
  • FIG. 7 is a schematic diagram of deformation of another projection image provided by the related art.
  • FIG. 8 is a schematic diagram of another projection image deformation provided by the related art.
  • FIG. 9 is a schematic structural diagram of another laser projection device provided by an embodiment of the present disclosure.
  • FIG. 1 is a flowchart of a method for correcting a projected image provided by an embodiment of the present disclosure.
  • the correction method can be applied to laser projection equipment. As shown in Figure 1, the method may include:
  • Step 101 In response to the correction instruction, display the target image on the projection screen.
  • the laser projection apparatus 10 can project and display the target image on the projection screen 20 in response to the correction instruction.
  • the target image 30 may include a main screen 301 and a plurality of characteristic graphics (eg, characteristic graphics 302 a , 302 b and 302 c ) surrounding the main screen 301 .
  • the color of each feature pattern is different from the background color of the area other than the main screen 301 in the target image 30.
  • the color of each feature graphic may be black, and the background color of the area other than the main screen 301 in the target image 30 may be white.
  • the laser projection equipment can keep the playback state of the main screen in the target image unchanged, thereby realizing the correction of the projection position of the projected image while ensuring the continuity of the main screen playback, thereby ensuring Continuity of user viewing.
  • Step 102 Acquire a photographed image obtained by photographing the projection screen by the camera.
  • the laser projection apparatus 10 may be provided with a camera 40 . After the laser projection device projects and displays the target image on the projection screen, it can send a shooting instruction to the camera. After receiving the photographing instruction, the camera can photograph the projection screen 20 to obtain a photographed image, and send the photographed image to the laser projection device 10, so that the laser projection device 10 can obtain the photographed image.
  • the camera can be independent of the laser projection device, and the user can control the camera to capture the projection screen to obtain a captured image, and control the camera to send the captured image to the laser projection device, and the laser projection device can obtain the captured image .
  • Step 103 For each feature pattern, determine the first target projection position of the feature pattern on the projection screen according to the perspective transformation coefficient of the camera and the shooting position of the feature pattern in the shot image.
  • the laser projection device After the laser projection device acquires the captured image, for each feature image, the laser projection device can determine the first position of the feature image on the projection screen according to the perspective transformation coefficient of the camera and the shooting position of the feature image in the captured image. A target projection position.
  • the perspective transformation coefficient can transform the position of any point on the projection screen into the position in the captured image, that is, the perspective transformation coefficient is the coefficient of variation between the coordinate system of the projection screen and the 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 projection screen may be polygonal, eg, rectangular.
  • Step 104 Determine the second target projection position of the reference point on the projection screen according to the perspective transformation coefficient and the shooting position of the reference point in the main screen in the shot image.
  • the laser projection device can also determine the second target projection position of the reference point on the projection screen according to the perspective transformation coefficient of the camera and the shooting position of the reference point in the main screen in the shot image.
  • the reference point may be located on the boundary of the main picture, or the reference point may be the center point of the main picture.
  • Step 105 Correct the projection position of the projected image according to the first target projection position of the plurality of feature patterns and the second target projection position of the reference point.
  • the laser projection device may, according to the first target projection position of the plurality of feature patterns and the second target projection position of the reference point, determine the target projection position of the reference point. Correct the projection position of the projected image.
  • the laser projection device can determine that the target vertex of the target image is on the projection screen according to the first target projection position of the target feature graph in the plurality of feature graphs and the second target projection position of the reference point.
  • the projection position of the projected image can be corrected according to the third target projection position of the target vertex and the first initial projection position of the target vertex on the projection screen.
  • the projection position of the projection image may be adjusted based on the difference between the third target projection position and the first initial projection position, so as to realize the correction of the projection position.
  • the first initial projection position of the target vertex may be the position of the target vertex on the projection screen when the projected image is not deformed.
  • the embodiments of the present disclosure provide a method for calibrating a projected image, because the method can determine the characteristic pattern according to the perspective transformation coefficient, the shooting position of the feature pattern, and the shooting position of the reference point in the main screen.
  • the first target projection position and the second target projection position of the reference point The first target projection position and the second target projection position of the reference point.
  • the projection position of the projected image may be corrected according to the first target projection position of the plurality of feature patterns and the second target projection position of the reference point. Therefore, even if the projection lens of the laser projection device is distorted or the laser projection device is displaced, the projected image displayed on the projection screen will not be deformed, thereby ensuring a better display effect of the projected image.
  • the target image displayed on the projection screen includes the main image during the process of calibrating the projected image
  • the continuous playback of the main image can be ensured, and the continuous playback of the main image can be prevented from being affected by the correction process of the projected image.
  • FIG. 4 is a flowchart of another method for correcting a projected image provided by an embodiment of the present disclosure.
  • the correction method can be applied to laser projection equipment. As shown in Figure 4, the method may include:
  • Step 401 in response to the correction instruction, display the target image on the projection screen.
  • the laser projection apparatus 10 can project and display the target image on the projection screen 20 in response to the correction instruction.
  • the target image may include a main picture and a plurality of characteristic graphics surrounding the main picture, and the color of each characteristic graphics is different from the background color of the area other than the main picture in the target image, thereby ensuring that the laser projection device is in the acquisition process.
  • the feature pattern can be identified from the captured image.
  • the characteristic pattern may be a quadrangle or a cross, or the like.
  • the target image 30 may include 12 characteristic graphics (eg, characteristic graphics 302a, 302b and 302c) surrounding the main screen 301, and the 12 characteristic graphics may all be cross-shaped.
  • the color of each feature graphic may be black, and the background color of the area other than the main screen 301 in the target image 30 may be white.
  • the laser projection device can keep the playing state of the main screen in the target image unchanged, thereby realizing the correction of the projection position of the projected image and ensuring the main The continuity of screen playback, thereby ensuring the continuity of user viewing.
  • the correction instruction may be triggered by a user through a projection client installed in the terminal.
  • a correction button may be displayed on the display interface of the projection client, and the projection client may generate a correction instruction after detecting the user's click operation on the correction button. Then the projection client can send the correction instruction to the laser projection device. After receiving the correction instruction sent by the projection client, the laser projection device can project and display the target image on the projection screen in response to the correction instruction.
  • the correction instruction may be triggered by a user through a remote control, and after receiving the correction instruction sent by the remote control, the laser projection device may, in response to the correction instruction, project and display the target image on the projection screen.
  • a calibration button may be provided on the laser projection device, and after detecting the user's click operation on the calibration button, the laser projection device may generate a calibration instruction, and then in response to the calibration instruction, the target image may be projected and displayed on the Projection screen.
  • the laser projection device may periodically generate a correction instruction, and in response to the correction instruction, may project and display the target image on the projection screen. That is, the laser projection apparatus can periodically perform the correction process of the target image.
  • Step 402 Acquire a photographed image obtained by photographing the projection screen by the camera.
  • the laser projection device 10 may be provided with a camera 40 , and the camera 40 may be connected to the laser projection device 10 by means of a universal serial bus (USB).
  • USB universal serial bus
  • the laser projection device 10 projects and displays the target image on the projection screen 20 , it can send a shooting instruction to the camera 40 .
  • the camera 40 can photograph the projection screen 20 to obtain a photographed image, and send the photographed image to the laser projection device 10, so that the laser projection device 10 can obtain the photographed image.
  • the camera can be independent of the laser projection device, and the user can control the camera to shoot the projection screen to obtain a captured image, and control the camera to send the captured image to the laser projection device, and then the laser projection device can obtain the captured image image.
  • Step 403 For each feature pattern, determine the first target projection position of the feature pattern on the projection screen according to the perspective transformation coefficient of the camera and the shooting position of the feature pattern in the shot image.
  • the projection screen may be polygonal.
  • the laser projection device can determine the shooting positions of multiple vertexes of the projection screen in the captured image, and can determine the shooting positions of the multiple vertexes of the projection screen according to the initial positions of the multiple vertexes of the projection screen and the multiple vertexes of the projection screen in the captured image.
  • the shooting position of the camera determines the perspective transformation coefficient of the camera.
  • the laser projection device can determine the first target projection position of the feature pattern on the projection screen according to the perspective transformation coefficient of the camera and the shooting position of the feature pattern in the shot image.
  • the perspective transformation coefficient can transform the position of any point on the projection screen into a position in the captured image, that is, the perspective transformation coefficient is a variation coefficient between the screen coordinate system of the projection screen and the 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 projection screen can be a quadrilateral, such as a rectangle.
  • the projection screen may include four vertices, a first vertex, a second vertex, a third vertex and a fourth vertex.
  • the first vertex may be the upper left vertex of the projection screen
  • the second vertex may be the upper right vertex of the projection screen
  • the third vertex may be the lower left vertex of the projection screen
  • the fourth vertex may be the projection screen the lower right vertex of .
  • the frame of the projection screen may include an inner frame and an outer frame, and the four vertices may be the vertices of the inner frame or the vertices of the outer frame, which are not limited in the embodiments of the present disclosure.
  • the position of each vertex is determined by two coordinates, the shooting position of the first vertex is (a1, b1), and the initial position of the first vertex is (x1, y1).
  • the shooting position of the second vertex is (a2, b2), and the initial position of the second vertex is (x2, y2).
  • the shooting position of the third vertex is (a3, b3), and the initial position of the third vertex is (x3, y3).
  • the shooting position of the fourth vertex is (a2, b2), and the initial position of the fourth vertex is (x4, y4).
  • the laser projection apparatus can determine a total of 8 equations from the following equations (1) to (8), and can determine the perspective transformation coefficients k0 to k7 by solving the 8 equations.
  • the laser projection device may determine a perspective transformation matrix according to the plurality of perspective transformation coefficients, and may determine an inverse matrix K -1 of the perspective transformation matrix. For each feature pattern, the laser projection device can determine the first target projection position of the feature pattern on the projection screen according to the inverse matrix K -1 of the perspective transformation matrix and the shooting position of the feature pattern.
  • the perspective transformation matrix K satisfies:
  • the inverse matrix K -1 of the perspective transformation matrix satisfies: the
  • the w satisfies: t ij is a parameter of the i-th row and the j-th column in the inverse matrix K -1 , and both i and j are positive integers less than or equal to 3.
  • 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 determines the perspective transformation coefficient of the camera based on the shot image, and determines the first target projection position of the feature pattern based on the perspective transformation coefficient and the shooting position of the feature pattern, thus improving the feature The accuracy of the determination of the first target projection position of the graphic.
  • the first target projection position of each feature graphic is the projection position of the feature graphic in the screen coordinate system of the projection screen, and the initial positions of the multiple vertices of the projection screen can be the multiple vertexes in the projection screen.
  • the shooting position of each feature graphic is the position of the feature graphic in the image coordinate system, and the shooting positions of the multiple vertices of the projection screen are the positions of the multiple vertexes in the image coordinate system.
  • the origin of the screen coordinate system is the center point of the projection screen, the horizontal axis of the screen coordinate system is parallel to the pixel row direction of the projection screen, and the vertical axis of the screen coordinate system is parallel to the pixel column direction of the projection screen.
  • the origin of the image coordinate system is the center point of the captured image, the horizontal axis of the image coordinate system is parallel to the pixel row direction of the captured image, and the vertical axis of the image coordinate system is parallel to the pixel column direction of the captured image.
  • the laser projection device when it determines the shooting positions of multiple feature patterns and multiple vertices of the projection screen, it can perform grayscale processing on the shot image to obtain a grayscale image. Afterwards, the laser projection device may determine the shooting position of each feature pattern of the projection screen and the shooting positions of multiple vertices of the projection screen in the captured image according to the grayscale value of each pixel in the grayscale image.
  • the gray value range of each pixel in the grayscale image may be [0, 255]. Wherein, a pixel with a grayscale value of 0 appears black in the grayscale image, and a pixel with a grayscale value of 255 appears white in the grayscale image.
  • each feature pattern may be composed of a plurality of target pixels included in one target pixel group. Since the distance between two adjacent feature patterns is within the first pixel range, the distance between two adjacent target pixel groups is within the first pixel range, and each target pixel group includes a plurality of target pixels The distance between any two adjacent target pixels is within the second pixel range.
  • the first pixel range and the second pixel range are fixed ranges pre-stored in the laser projection device.
  • the laser projection device can identify a plurality of pixels in the grayscale image whose grayscale values are less than the first grayscale value threshold, and can determine a plurality of target pixel groups from the plurality of pixels, and then can obtain that each target pixel group includes: The shooting positions of multiple target pixels. Afterwards, referring to FIG. 5 , the laser projection device may determine the shooting position of the vertex pixel of the feature graph formed by each target pixel group (for example, vertex pixel A shown in FIG. 5 ) in the captured image as the same as the target pixel group. The shooting position of the corresponding feature pattern.
  • the laser projection device may determine the shooting position of the feature pattern corresponding to the target pixel group from the shooting position of the center point pixel of the feature pattern formed by the target pixel group in the shot image. If the shape of each feature pattern is a polygon, the laser projection device can determine the shooting positions of multiple vertex pixels of the feature graphic enclosed by the target pixel group in the shot image, and can determine the shooting positions of the multiple vertex pixels. The average value is determined as the shooting position of the feature pattern corresponding to the target pixel group.
  • the first gray value threshold is a fixed range pre-stored in the laser projection device.
  • the embodiments of the present disclosure are described by taking as an example that the vertices of the projection screen are the vertices of the outer frame. If the color of the border of the projection screen is black, the laser projection device may determine the pixels in the grayscale image whose grayscale values are smaller than the second grayscale value threshold as edge pixels. Then the laser projection device can determine the position of the edge pixel in the grayscale image as the position of each pixel on the border of the projection screen in the captured image, and can determine the edge pixel that is farthest from the center point of the grayscale image. The positions of the four points are determined as the shooting positions of the four vertices.
  • the second gray value threshold may be a fixed value pre-stored in the laser projection device.
  • the grayscale values of the pixels between the inner and outer borders of the projection screen are within a fixed range.
  • the position in is the position of each pixel on the inner and outer borders of the projection screen in the captured image.
  • Step 404 Detect whether the first target projection positions of the plurality of feature patterns are all located within the projection screen.
  • the laser projection device can detect whether the first target projection positions of the plurality of feature patterns are located in the projection screen. If it is detected that the first target projection positions of the multiple feature patterns are all located in the projection screen, the laser projection device can determine that the deformation of the projection image is small, and after correcting the projection positions of the projection image, the image information loss of the projection image is relatively small. If less, the laser projection device may perform step 405 . If it is detected that the first target projection position of any feature pattern is outside the projection screen, the laser projection device can determine that the deformation of the projection image is relatively large, and after correcting the projection position of the projection image, the image information of the projection image is lost more. , so the laser projection device can perform step 408 .
  • the laser projection device can detect whether the distance between the first target projection position of the feature pattern and the initial position of the center point of the projection screen is smaller than the first pixel threshold. If it is detected that the value is smaller than the first pixel threshold, it can be determined that the first target projection position of the feature pattern is located within the projection screen. If it is detected that it is greater than or equal to the first pixel threshold, it can be determined that the first target projection position of the feature pattern is located outside the projection screen.
  • the first pixel threshold is a fixed value pre-stored in the laser projection device.
  • Step 405 Determine the second target projection position of the reference point on the projection screen according to the perspective transformation coefficient and the shooting position of the reference point in the main screen in the shot image.
  • the laser projection equipment After the laser projection equipment determines that the first target projection positions of the multiple feature patterns are all located within the projection screen, it can determine the reference point on the projection screen according to the perspective transformation coefficient and the shooting position of the reference point in the main screen in the captured image.
  • the w satisfies:
  • the reference point is located on the boundary of the main picture, for example, the reference point may be a vertex on the boundary of the main picture.
  • the color of the border of the main picture is different from the background color of the area other than the main picture in the target image, thereby ensuring that the reference point can be recognized by the laser projection device.
  • the laser projection device can determine a plurality of pixels in the grayscale image whose grayscale values are less than the third grayscale value threshold, And among the plurality of pixels, a pixel that is smaller than any one of the characteristic patterns is determined as a boundary pixel on the boundary of the main picture. Then, the laser projection device can determine the position of the boundary pixel in the grayscale image as the position of each pixel on the boundary of the main picture in the captured image.
  • the laser projection device can determine the positions of the four points farthest from the center point of the main picture in the boundary pixels as the four points on the boundary The shooting position of the vertex, from which the shooting position of the reference point can be determined.
  • the third gray value threshold may be a fixed value pre-stored in the laser projection device.
  • Step 406 Determine the third target projection position of the target vertex of the target image on the projection screen according to the first target projection position of the target feature graph, the second target projection position of the reference point, and the target ratio in the plurality of feature graphs.
  • the laser projection device After the laser projection device determines the first target projection position of the plurality of feature patterns and the second target projection position of the reference point, the laser projection device can determine the first target projection position of the target feature pattern in the plurality of feature patterns, the reference point The second target projection position and the target ratio determine the third target projection position of the target vertex of the target image on the projection screen.
  • the boundary of the target image, the boundary of the main screen, and the figure formed by the plurality of characteristic figures are all quadrilaterals.
  • the reference point may be a vertex of the boundary of the main picture.
  • the target feature graph is a feature graph whose distance from the reference point is less than the distance threshold.
  • the target ratio is positively correlated with the difference between the second initial projection position and the first initial projection position, and is negatively correlated with the difference between the third initial projection position and the first initial projection position.
  • the target vertex is the vertex closest to the reference point among the multiple vertices of the target image, the first initial projection position, the second initial projection position and the third initial projection position are the target vertex,
  • the distance threshold may be a fixed value pre-stored in the laser projection device.
  • the reference point 301 a may be the upper right vertex of the border of the main screen 301
  • the target vertex may be the vertex closest to the reference point 301 a among the vertices of the target image 30 , that is, in the target image 30 . top right vertex of .
  • the target feature pattern is a feature pattern whose distance from the reference point 301a is less than a distance threshold. That is, the target feature graph may be the feature graph 302a, or the feature graph 302b, or the feature graph 302c. Alternatively, the target feature graph may include feature graph 302a, feature graph 302b, and feature graph 302c.
  • the target ratio may include a first ratio and a second ratio
  • the laser projection device is based on the first target projection position of the target feature pattern in the plurality of feature patterns, the second target projection position of the reference point, and the target ratio.
  • the laser projection device can determine the third target projection of the target vertex according to the second coordinate g1 of the first target projection position of the target feature pattern, the second coordinate g2 of the second target projection position of the reference point, and the second ratio S2 The second coordinate g3 of the location.
  • the first coordinate of the third target projection position satisfies:
  • the first coordinate may be an abscissa
  • the second coordinate may be an ordinate.
  • the first ratio S1 may be the ratio of the first initial difference R to the second initial difference P, that is, the first ratio S1 satisfies:
  • the second ratio S2 may be the ratio of the third initial difference H to the fourth initial difference Q, that is, the second ratio S2 satisfies:
  • the first coordinate z1 of the first target projection position may be the average value of the first coordinates of the first target projection positions of the plurality of target feature patterns.
  • the second coordinate g1 of the first target projection position is the average value of the second coordinates of the second target projection positions of the plurality of target feature patterns.
  • Step 407 Correct the projection position of the projected image according to the third target projection position of the target vertex and the first initial projection position of the target vertex on the projection screen.
  • the laser projection device After determining the third target projection position of the target vertex, the laser projection device can correct the projection position of the projected image according to the third target projection position of the target vertex and the first initial projection position of the target vertex on the projection screen.
  • the laser projection device can determine the third target projection position when correcting the projection position of the projected image according to the third target projection position of the target vertex and the first initial projection position of the target vertex on the projection screen.
  • the pixels in the projected image can be controlled to move by the first target difference in a direction opposite to the first offset direction.
  • the laser projection device can It is determined that the first offset direction is a direction s1 parallel to the pixel row direction and away from the origin of the screen coordinate system.
  • the laser projection device can control the pixels in the projected image to be parallel to the pixel row direction and close to the origin of the screen coordinate system.
  • the direction s2 translates the first target difference. If the absolute value of the first coordinate of the third target projection position is smaller than the absolute value of the first coordinate of the first initial projection position, referring to FIG.
  • the laser projection device can determine that the first offset direction is parallel to the pixel row direction , and the direction s2 close to the origin of the screen coordinate system, the laser projection device can control the pixels in the projected image to translate the first target difference along the direction s1 parallel to the pixel row and away from the origin of the screen coordinate system.
  • the laser projection device may also determine a second target difference between the second coordinates of the third target projection position and the second coordinates of the first initial projection position, and the difference between the second coordinates of the third target projection position relative to the first initial projection position The second offset direction of the second coordinate. Further, the pixels in the projected image can be controlled to move by the second target difference in a direction opposite to the second offset direction.
  • the laser projection device can It is determined that the second offset direction is a direction s3 parallel to the pixel row direction and away from the origin of the screen coordinate system, then the laser projection device can control the pixels in the projected image to be parallel to the pixel row direction and close to the origin of the screen coordinate system The direction s4 translates the second target difference. If the absolute value of the second coordinate of the third target projection position is smaller than the absolute value of the second coordinate of the first initial projection position, referring to FIG.
  • the laser projection device can determine that the second offset direction is parallel to the pixel row direction , and the direction s4 is close to the origin of the screen coordinate system, the laser projection device can control the pixels in the projected image to translate the second target difference along the direction s3 parallel to the pixel column and away from the origin of the screen coordinate system.
  • Step 408 displaying prompt information.
  • the laser projection device After the laser projection device detects that the first target projection position of any feature pattern in the plurality of feature patterns is outside the projection screen, it can display prompt information, the prompt information is used to prompt that the deformation of the projected image is large, thereby reminding
  • the user adjusts the position of the laser projection device or the distortion coefficient of the projection lens in time to adjust the projection position of the projected image.
  • the prompt information may be "The projected image is greatly deformed, please adjust the position of the laser projection device".
  • the projection lens of the laser projection device is greatly distorted or the laser projection device is displaced, the projected image displayed on the projection screen will not be deformed, ensuring the projection The image display effect is better.
  • step 408 can be deleted according to the situation
  • steps 405 to 407 can be deleted according to the situation.
  • the embodiments of the present disclosure provide a method for calibrating a projected image, because the method can determine the feature pattern according to the perspective transformation coefficient, the shooting position of the feature pattern, and the shooting position of the reference point in the main screen
  • the projection position of the projected image may be corrected according to the first target projection position of the plurality of feature patterns and the second target projection position of the reference point. Therefore, even if the projection lens of the laser projection device is distorted or the laser projection device is displaced, the projected image displayed on the projection screen will not be deformed, thereby ensuring a better display effect of the projected image.
  • the method provided by the embodiment of the present disclosure can ensure the continuous playback of the main screen while correcting the projection position of the projected image. , so as to ensure the continuous viewing of the user, and the user experience is better.
  • the laser projection apparatus 10 may include a light source assembly 11 , a light modulation assembly 12 , a projection lens 13 , a position determination circuit 14 , a difference value determination circuit 15 and a correction circuit 16 .
  • the light source assembly 11 is used to emit a laser beam and transmit the laser beam to the light modulation assembly 12 .
  • the light source assembly 11 may include a laser light source and a light transmitting lens.
  • the laser light source is used for emitting a laser beam
  • the optical transmission lens is used for transmitting the laser beam emitted by the laser light source to the light modulation component 12 .
  • the laser light source may be a three-color laser light source, a single-color laser light source, or a two-color laser light source, which is not limited in this embodiment of the present disclosure.
  • the light modulation component 12 may be a digital micro-mirror device (DMD), a liquid crystal display (LCD) or a liquid crystal on silicon (LCOS) device.
  • DMD digital micro-mirror device
  • LCD liquid crystal display
  • LCOS liquid crystal on silicon
  • the correction circuit 16 is used to respond to the correction instruction, generate a control signal according to the pixel value of the target image, and control the light modulation component 12 according to the control signal to modulate the light beam irradiated on its surface into an image light beam, and transmit the image light beam to the projection Lens 13.
  • the projection lens 13 is used to transmit the image beam to the projection screen 20 to project and display the target image on the projection screen 20 .
  • the correction circuit 16 can send a shooting instruction to the camera 40 after detecting the target duration of the correction instruction. 20 captures and sends the resulting captured image to the position determination circuit 14 .
  • the position determination circuit 14 may then perform steps 102 to 104 and steps 402 to 406 described above.
  • the difference value determination circuit 15 is used to determine the first difference value, the first offset direction, the second difference value and the second offset direction, and send the position offset amount to the correction circuit 16 .
  • the correction circuit 16 is used for correcting the projection position of the projected image according to the first difference value, the first offset direction, the second difference value and the second offset direction.
  • an embodiment of the present disclosure provides a laser projection device, which is used for:
  • a target image is displayed on the projection screen, and the target image includes a main image and a plurality of feature patterns surrounding the main image, each feature pattern having a color different from the background color of an area other than the main image in the target image.
  • a captured image obtained by capturing the projection screen with a camera is acquired.
  • the first target projection position of the feature pattern on the projection screen is determined according to the perspective transformation coefficient of the camera and the shooting position of the feature pattern in the shot image.
  • the second target projection position of the reference point on the projection screen is determined according to the perspective transformation coefficient and the shooting position of the reference point in the main screen in the shot image.
  • the projection position of the projected image is corrected according to the first target projection position of the plurality of feature patterns and the second target projection position of the reference point.
  • the embodiments of the present disclosure provide a laser projection device, because the laser projection device can determine the characteristic pattern according to the perspective transformation coefficient, the shooting position of the characteristic pattern, and the shooting position of the reference point in the main screen.
  • the first target projection position and the second target projection position of the reference point The first target projection position and the second target projection position of the reference point.
  • the projection position of the projected image may be corrected according to the first target projection position of the plurality of feature patterns and the second target projection position of the reference point. Therefore, even if the projection lens of the laser projection device is distorted or the laser projection device is displaced, the projected image displayed on the projection screen will not be deformed, thereby ensuring a better display effect of the projected image.
  • the reference point is located on the boundary of the main picture, and the color of the boundary of the main picture is different from the background color of the area other than the main picture in the target image.
  • the laser projection device is used for:
  • the projection position of the projected image is corrected according to the third target projection position of the target vertex and the first initial projection position of the target vertex on the projection screen.
  • the target feature pattern is a feature pattern whose distance from the reference point is less than the distance threshold; the target ratio is positively correlated with the difference between the second initial projection position and the first initial projection position, and is directly related to the third initial projection position and the first initial projection.
  • the difference in position is negatively correlated.
  • the target vertex is the vertex closest to the reference point among the multiple vertices of the target image.
  • the first initial projection position, the second initial projection position and the third initial projection position are respectively the projection positions of the target vertex, target feature graph and reference point on the projection screen when the projection image is not deformed.
  • the target ratio may include a first ratio and a second ratio; the laser projection device is used for:
  • the first coordinates of the third target projection position of the target vertex are determined according to the first coordinates of the first target projection position of the target feature pattern, the first coordinates of the second target projection position of the reference point and the first ratio.
  • the second coordinate of the third target projected position of the target vertex is determined according to the second coordinate of the first target projected position of the target feature pattern, the second coordinate of the second target projected position of the reference point, and the second ratio.
  • the pixels in the projected image are controlled to move by the first target difference in a direction opposite to the first offset direction.
  • the pixels in the projected image are controlled to move by the second target difference in a direction opposite to the second offset direction.
  • the first ratio is the ratio of the first initial difference to the second initial difference
  • the first initial difference is the difference between the first coordinate of the second initial projection position and the first coordinate of the first initial projection position
  • the first The second initial difference is the difference between the first coordinates of the third initial projection position and the first coordinates of the first initial projection position
  • the second ratio is the ratio of the third initial difference to the fourth initial difference
  • the third initial difference is the difference between the second coordinate of the second initial projection position and the second coordinate of the first initial projection position
  • the fourth The initial difference is the difference between the second coordinates of the third initial projection position and the second coordinates of the first initial projection position.
  • the laser projection device is also used for:
  • the second target projection position of the reference point on the projection screen is determined according to the perspective transformation coefficient and the shooting position of the reference point in the main screen in the captured image .
  • the laser projection device is also used for:
  • prompt information is displayed, and the prompt information is used to prompt that the deformation of the projected image is large.
  • the embodiments of the present disclosure provide a laser projection device, because the laser projection device can determine the characteristic pattern according to the perspective transformation coefficient, the shooting position of the characteristic pattern, and the shooting position of the reference point in the main screen.
  • the first target projection position and the second target projection position of the reference point The first target projection position and the second target projection position of the reference point.
  • the projection position of the projected image may be corrected according to the first target projection position of the plurality of feature patterns and the second target projection position of the reference point. Therefore, even if the projection lens of the laser projection device is distorted or the laser projection device is displaced, the projected image displayed on the projection screen will not be deformed, thereby ensuring a better display effect of the projected image.
  • An embodiment of the present disclosure provides a laser projection device, including: a memory, a processor, and a computer program stored on the memory, and when the processor executes the computer program, the method for calibrating a projected image provided by the foregoing method embodiments is implemented, for example The method shown in Figure 1 or Figure 4.
  • Embodiments of the present disclosure provide a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and the instructions are loaded and executed by a processor to implement the method for calibrating a projected image provided by the foregoing method embodiments, for example, as shown in FIG. 1 or the method shown in Figure 4.
  • An embodiment of the present disclosure provides a computer program product containing instructions, when the computer program product runs on a computer, the computer is made to execute the projection image correction method provided by the above method embodiments, for example, as shown in FIG. 1 or FIG. 4 . Methods.
  • the terms “first”, “second”, “third” and “fourth” are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.
  • the meaning of the term “plurality” in the embodiments of the present disclosure refers to two or more. The above are only optional embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection of the present disclosure. within the range.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Geometry (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

La présente demande divulgue un procédé de correction d'image de projection et un dispositif de projection laser. La présente invention concerne le domaine de l'affichage par projection. Grâce au procédé de correction, une première position de projection cible d'un motif de caractéristique et une seconde position de projection cible d'un point de référence peuvent être déterminées selon un coefficient de transformation de perspective, une position de capture d'image du motif de caractéristique et une position de capture d'image du point de référence dans une image principale, et, la position de projection d'une image projetée est corrigée en fonction des premières positions de projection cibles de multiples motifs de caractéristiques et de la seconde position de projection cible du point de référence; par conséquent, même si une lentille de projection d'un dispositif de projection laser est déformée ou que le dispositif de projection laser est déplacé, l'image projetée affichée sur un écran de projection n'est également pas déformée, ce qui permet d'assurer que l'effet d'affichage de l'image projetée est meilleur. De plus, lors de la correction d'une image projetée, étant donné qu'une image cible affichée dans un écran de projection comprend une image principale, la lecture continue de l'image principale peut ainsi être assurée.
PCT/CN2022/082627 2021-03-31 2022-03-24 Procédé de correction d'image de projection et dispositif de projection laser WO2022206527A1 (fr)

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CN113824939B (zh) * 2021-09-29 2024-05-28 深圳市火乐科技发展有限公司 投影图像调节方法、装置、投影设备及存储介质
WO2023071256A1 (fr) * 2021-10-29 2023-05-04 青岛海信激光显示股份有限公司 Dispositif de projection laser, et procédé de correction pour image projetée
CN114268777B (zh) * 2021-12-20 2023-08-18 青岛海信激光显示股份有限公司 激光投影设备的开机方法及激光投影系统
CN113890626B (zh) * 2021-11-11 2023-03-10 青岛海信激光显示股份有限公司 色散校正方法、装置、激光电视机及存储介质
CN114245089B (zh) * 2021-12-20 2023-07-18 青岛海信激光显示股份有限公司 几何校正方法、装置、激光投影设备
WO2023115857A1 (fr) * 2021-12-20 2023-06-29 青岛海信激光显示股份有限公司 Dispositif de projection laser et procédé de correction d'image de projection
CN114979600B (zh) * 2022-06-13 2024-04-26 青岛海信激光显示股份有限公司 激光投影设备及投影图像的校正方法
CN115134569B (zh) * 2022-06-22 2024-04-02 青岛海信激光显示股份有限公司 图像显示方法和投影仪

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