Method and System for Automatic Correction of Projected Image

Abstract

The present invention provides a method and system for automatically correcting a projection screen, which is used to correct the projection screen to a reference position, including a projection screen and a collection area. A positioning light spot P is projected at a fixed position P0 on the projection screen, and a reference position S is set within the collection area. When the positioning light spot P overlaps with the reference position S, the projection screen is located at the reference position. When the positioning light spot P deviates from the reference position S and is outside the collection area, automatic correction is performed by the following method: S1 Move the positioning light spot P from the inside out; S2 When the positioning light spot P moves into the collection area, stop moving the positioning light spot P; S3 Move the positioning light spot P to the reference position S and synchronously drive the projection screen to move to the reference position. The present invention takes into account that the collection area cannot be designed too large, and provides a fast and accurate automatic correction method and system on the premise of ensuring the stability of the projection screen.

Description

Technical Field

[0001] The present invention relates to the technical field of projection correction, and more specifically, to a method and system for automatically correcting a projection screen. Background Art

[0002] In the field of automatic projection correction, when the displacement of the projector causes the positioned light spot to fail to project into the effective area of the acquisition area, the automatic projection correction system cannot collect an effective positioned light spot, resulting in the abnormal operation of the automatic correction function. Therefore, it is necessary to design an automatic scanning method to make the positioned light spot project into the effective area of the acquisition surface and be effectively collected. Considering the product volume and aesthetic requirements, the size of the acquisition box cannot be designed too large, so the acquisition area cannot be designed too large. When the projector is displaced, the positioned light spot may exceed the acquisition area. At this time, the physical size limitation causes the acquisition area to be unable to collect the light spot, and thus automatic correction cannot be performed. At the same time, considering the usage scenario, the correction process cannot be too abrupt, such as causing the projection screen to shake, which affects the viewing experience. It is necessary to balance the usage experience, correction accuracy, and efficiency at the same time.

[0003] In a specific usage scenario, there may be multiple projection screens. For example, in the Chinese invention patent with the application number 202210555132, each projection screen includes an effective screen and a dark area screen corresponding to the effective screen. The dark area screen is located around the effective screen. Adjacent projection screens are fused to form a fusion area. Adjacent effective screens form an effective fusion area, and adjacent dark area screens form an ineffective fusion area. The effective screen is used to display the projection playback content, while the dark area screen does not display the projection playback content. The effective screen is projected onto the projection carrier, and the dark area screen is located at the four edges of the projection carrier. Each projection screen has its own corresponding reference position, which is the point marked on the dark area screen corresponding to each projection screen in the aligned state of the effective fusion area; each projection screen displays a positioned light spot that is aligned with the reference position of the corresponding projection screen in the original state on its dark area screen, and the positioned light spot is linked to the effective screen of the projection screen to which it corresponds.

[0004] The positioned light spot is used to adjust the corresponding effective screen. Each positioned light spot is linked to the effective screen of the projection screen to which it corresponds. When the position of the positioned light spot is adjusted, the position of the effective screen to which it is linked will also change. Since the reference position is marked on the dark area screen corresponding to each projection screen in the aligned state of the effective fusion area, the positioned light spot that is aligned with the reference position in the original state will fall into the dark area screen of the projection screen. That is, the position of the effective screen can be adjusted by adjusting the position of the positioned light spot on the dark area screen, thereby realizing the correction of the projection screen.

[0005] Therefore, there is an urgent need for a method for automatically correcting a projection screen that can simultaneously consider accuracy, efficiency, and user experience to solve the problem of projection screen correction. Summary of the Invention

[0006] The present invention aims to overcome at least one defect of the above-mentioned prior art and provides a method for automatically correcting a projection screen. Under the condition that the acquisition area does not need to be designed too large, through the projection of the positioning light spot and the cooperation of the acquisition area, the projection screen can be accurately and quickly automatically corrected without overly affecting the use experience of the projection screen. It is used to solve the problems in the prior art that the acquisition area is limited, the projection screen with too large deviation cannot be corrected, and the use experience, correction accuracy, and efficiency cannot be considered simultaneously.

[0007] The present invention provides a method for automatically correcting a projection screen for correcting the projection screen to a reference position, including a projection screen and an acquisition area. A positioning light spot P is projected at a fixed position P0 on the projection screen, and a reference position S is set in the acquisition area.

[0008] When the positioning light spot P overlaps with the reference position S, the projection screen is located at the reference position.

[0009] When the positioning light spot P deviates from the reference position S and is outside the acquisition area, automatic correction is performed by the following method:

[0010] S1 Move the positioning light spot P from the inside out.

[0011] S2 When the positioning light spot P moves into the acquisition area, stop moving the positioning light spot P.

[0012] S3 Move the positioning light spot P to the reference position S and synchronously drive the projection screen to move to the reference position.

[0013] The reference position S in the acquisition area can determine the position to which the projection screen currently needs to move, that is, the accurate position of the projection. Through the positioning of the positioning light spot, the projection screen can be driven to move to the accurate position, thereby achieving the effect of automatically correcting the projection screen. When the positioning light spot is not within the acquisition area, it means that the projection screen has a large deviation and automatic correction cannot be performed at this time. It is necessary to first locate the positioning light spot in the acquisition area and then perform automatic correction. This can not only reduce the positioning time of the positioning light spot, improve the correction efficiency, but also reduce the movement frequency of the projection screen, avoid screen jitter, and ensure the use experience and visual perception of the projection. The acquisition area can accurately locate the light spot, thereby achieving the effect of accurate correction.

[0014] Further, in the step S1, specifically, change the position of the positioning light spot P on the projection screen to make the positioning light spot P deviate from the fixed position P0 and move from the inside out with the fixed position P0 as the center.

[0015] P0 is the initial position where the positioning light spot is projected, and it also represents the initial position of the projection screen. In step S1, moving from the inside out with the fixed position P0 as the center can make the positioning light spot gradually approach the acquisition area, avoiding blindly changing the position of the light spot. Blindly changing the position of the light spot will not only lead to low efficiency, thereby affecting the correction efficiency, but also increase energy consumption and affect the power consumption of the device. By moving regularly from the inside out, the light spot approaches the acquisition area from far to near, which can achieve the effects of improving the correction efficiency and reducing energy consumption. It can also avoid getting into an endless loop of blind and fruitless positioning, being unable to locate the acquisition area for a long time, resulting in device overheating or even crashing.

[0016] In the said step S3, first move the projection screen to make the fixed position P0 coincide with the positioning light spot P, and then move the positioning light spot P to the reference position S, synchronously driving the projection screen to move to the reference position.

[0017] In step S3, move the projection screen to make P0 coincide with the positioning light spot P. First, let the projection screen return to the area where automatic correction can be performed within the acquisition area. At this time, P0 coincides with the positioning light spot P. Subsequently, move the positioning light spot P to make it move to the reference position S, which can correct the projection screen to the accurate position, achieving the effect of accurately positioning the projection screen, and also reducing the movement frequency of the projection screen to a certain extent, improving the user experience and visual perception.

[0018] Further, in the said step S1, specifically, without changing the position of the positioning light spot P on the projection screen, move the projection screen to drive the positioning light spot P to move synchronously, moving from the inside out with the initial position of the positioning light spot P as the center. During this process, the positioning light spot P always remains at the fixed position P0 on the projection screen.

[0019] Without changing the position of the positioning light spot P, moving the projection screen to drive the positioning light spot P to move can allow the user to observe the position of the projection screen at any time, judge the distance from the acquisition area or the reference position S according to the position of the projection screen, and then manual adjustment can be taken to assist in the correction of the projection screen, improving the correction efficiency. Moreover, when the projection screen deviates too much, automatic adjustment may not be able to quickly return the projection screen to the acquisition range of the acquisition area. Through the movement of the projection screen and the timely intervention of the user, the projection screen can be efficiently returned to the acquisition range of the acquisition area.

[0020] Further, the acquisition area is specifically the photosensitive area of the optical signal sensor, and the reference position S is a pixel / pixel area with fixed coordinates within the photosensitive area. In step S2, when the positioning light spot P moves into the acquisition area, specifically, the photosensitive area receives the optical signal of the positioning light spot P, and the coordinates of the pixel / pixel area P' where the optical signal is located are compared with the coordinates of the reference position S to calculate the offset distance of the positioning light spot P on the X / Y axis in step S3.

[0021] The acquisition area is the photosensitive area of the optical signal sensor, which can perform pixel-level positioning of the optical signal. In step S2, when the photosensitive area receives the optical signal of the positioning light spot P, the accurate coordinates of the positioning light spot P can be obtained and it can be known that the positioning light spot P is within the range of the acquisition area. At this time, by calculating the offset distance between the accurate coordinates of the positioning light spot P and the coordinates of the reference position S, the offset distance of the positioning light spot P on the X / Y axis can be obtained, so that an accurate offset amount can be obtained in step S3, and then the projection screen can be accurately corrected. Using the photosensitive area of the optical signal sensor can improve the efficiency of acquisition and correction. Since the optical signal conduction speed is fast and the optical signal sensor is relatively sensitive, a rapid response effect can be achieved, greatly improving the efficiency and accuracy of automatic correction and enhancing the user experience.

[0022] Further, the acquisition area is specifically the photosensitive area of the optical signal sensor, and the reference position S is a pixel / pixel area with fixed coordinates within the photosensitive area. In step S2, when the positioning light spot P moves into the acquisition area, specifically, the central area centered on the reference position S in the photosensitive area receives the optical signal of the positioning light spot P, and the coordinates of the pixel / pixel area P'' where the optical signal is located are compared with the coordinates of the reference position S to calculate the offset distance of the positioning light spot P on the X / Y axis in step S3. The area of the central area is smaller than that of the photosensitive area.

[0023] The central area is located in the photosensitive area and its area is smaller than that of the photosensitive area. When the positioning light spot P moves into the range of the central area, that is, when the central area receives the optical signal of the positioning light spot P, the positioning light spot P stops moving. At this time, it is considered that the positioning light spot P has been initially positioned at the position to be corrected. Then, S3 calculates the offset amount, which can reduce the movement frequency of the positioning light spot P and the calculation amount of the offset amount, thereby improving the efficiency and speed of correction, reducing the jitter frequency of the projection screen, and improving the user experience and visual perception. Since the area of the central area is smaller than that of the photosensitive area, when designing the acquisition device, a higher-precision photosensitive material can be used in the central area, which can reduce costs while ensuring the correction efficiency and accuracy.

[0024] Further, the central area is a symmetric area centered on the reference position S, and the area it occupies in the photosensitive area is less than 50%.

[0025] The central region is a symmetric region centered on the reference position S and occupies less than 50% of the photosensitive area. That is, the central region is located at the relative center of the acquisition region and is a centrally symmetric region with a small area, which is beneficial for design and cost reduction. Furthermore, the moving frequency of the positioning light spot P for preliminary correction of the projection screen is increased, and the actual moving frequency of the projection screen is decreased, which is beneficial for reducing the jitter of the projection screen and improving the user experience and visual perception.

[0026] Furthermore, in the step S1, the positioning light spot P is moved from the inside to the outside. Specifically, taking the initial position of the positioning light spot P as the center, with a fixed span Lx and Ly or a multiple of the fixed span Lx and Ly as the moving span, a square lattice surrounding the initial position of the positioning light spot P is formed.

[0027] The initial position of the positioning light spot P is the position where the positioning light spot is first projected onto the projection screen. Taking a fixed span Lx and Ly or a multiple of the fixed span Lx and Ly as the moving span stipulates the moving span of the positioning light spot P. When the positioning light spot P drives the projection screen to move, the movement of the projection screen also has a fixed span, rather than moving randomly and disorderly, which can avoid causing a sense of dizziness to the user and improve the user experience. The square lattice stipulating the movement trajectory of the positioning light spot P is beneficial for reducing the calculation amount and then improving the correction efficiency of the projection screen; it also considers that the photosensitive elements in the photosensitive area may be distributed in a lattice, which can reduce the omission of photosensitive elements and improve the correction accuracy.

[0028] Furthermore, the density of the outer layer of the square lattice is less than that of the inner layer.

[0029] The density of the square lattice depends on the moving span of the positioning light spot P. The positioning light spot P is projected in the form of a square lattice. First, a square is projected with a large span to roughly locate the position of the acquisition area. The span gradually increases with the number of projections of the positioning light spot P, and the positioning becomes more and more accurate. When the projection screen deviates too much, the positioning efficiency can be improved, and then the correction efficiency of the projection screen can be improved.

[0030] Furthermore, the square lattice includes at least three-layer structures, which are the first layer, the second layer, and the third layer from the inside to the outside. The moving span of the positioning light spot P on the first layer is the fixed span Lx and Ly, the moving span on the second layer is 2 times the fixed span Lx and Ly, and the moving span on the third layer is 3 times the fixed span Lx and Ly. The covered area is between 20mm×20mm and 100mm×100mm.

[0031] The square dot matrix for positioning the spot P is divided into three layers from the inside out, and the spacing increases layer by layer. That is, the span of the spot P increases by a factor of one for each layer. When the spot P drives the projection screen to move, the projection screen also moves with an increasing span and increases by a factor of one layer by layer, rather than moving randomly and disorderly, which may cause the screen to shake, thus avoiding bringing a sense of dizziness to the user and improving the user experience. The square dot matrix that defines the movement trajectory of the spot P, with the span increasing layer by layer, is beneficial to reducing the computational amount and thus improving the efficiency of correcting the projection screen. It also takes into account that the photosensitive elements in the photosensitive area may be distributed in a dot matrix, which can reduce the omission and error of the photosensitive elements and improve the accuracy of correction. Considering the pixel size of the projection screen and the projection interval of the spot P, the coverage area is set between 20mm×20mm and 100mm×100mm, which is beneficial to improving the positioning efficiency of the spot P, reducing the projection frequency, and thus improving the efficiency of correcting the projection screen.

[0032] Further, the acquisition area is specifically the photosensitive area of the optical signal sensor, and the fixed spans Lx and Ly are 2 to 10 pixel sizes.

[0033] Considering product design or other factors, the projection screen and the acquisition area may have different sizes. The fixed spans Lx and Ly can be 2 to 10 pixel sizes, which are applicable to different sizes of projection screens and acquisition areas. Setting the fixed spans Lx and Ly in units of pixels can improve the acquisition success rate of the photosensitive area, thus improving the positioning accuracy and the efficiency of correcting the screen.

[0034] Further, the following steps are also included between steps S2 and S3:

[0035] S23 Reconfirm whether the spot P is within the acquisition area.

[0036] The spot P may be interfered with, affecting the progress of correcting the projection screen. Therefore, when collecting the spot P, the spot P is confirmed multiple times to ensure that the spot P is accurately collected by the acquisition area, thus improving the stability and accuracy of the correction, avoiding collection errors, and preventing the projection screen from making incorrect or invalid movements, which may affect the user experience.

[0037] Further, step S23 is specifically to project the spot P again or multiple times at the position where the movement of the spot P stops, and determine whether the acquisition area can receive the signal of the spot P.

[0038] Project the positioning light spot P again or multiple times at the position where the movement of the positioning light spot P stops, ensuring that the positioning light spot P is collected by the collection area again, which can improve the stability and accuracy of correction, avoid collection errors, and prevent the projection screen from generating incorrect or invalid movements, thus affecting the user experience. Projecting the positioning light spot P again can enable the positioning light spot P to be successfully positioned in the collection area with the least number of movement frequencies, improving the positioning efficiency, and thereby enhancing the efficiency of projection screen correction. Additionally, the positioning light spot P can be projected multiple times to ensure the positioning accuracy, and further improve the accuracy of projection screen correction.

[0039] Further, step S23 is specifically to project the positioning light spot P again or multiple times at the corresponding position outside the outer layer of the position where the movement of the positioning light spot P stops, and determine whether the collection area can receive the signal of the positioning light spot P.

[0040] When the span of the positioning light spot P is fixed, the positioning light spot P can be directly projected again or multiple times at the corresponding position outside the outer layer of the square dot matrix, reducing unnecessary projections, reducing energy consumption, and improving the efficiency of projection screen correction.

[0041] The present invention also provides an automatic projection screen correction system, including a projection screen and a collection area. A positioning light spot P is projected at a fixed position P0 on the projection screen, and a reference position S is set within the collection area. When the positioning light spot P overlaps with the reference position S, the projection screen is located at the reference position. When the positioning light spot P deviates from the reference position S and is outside the collection area, automatic correction is performed, including:

[0042] A positioning light spot movement module for moving the positioning light spot P from the inside out;

[0043] A positioning light spot confirmation module for confirming to stop moving the positioning light spot P when the positioning light spot P moves into the collection area;

[0044] A projection screen synchronization module for moving the positioning light spot P to the reference position S and synchronously driving the projection screen to move to the reference position.

[0045] Under the condition that the collection area does not need to be designed too large, the automatic projection screen correction system of the present invention enables the projection screen to be accurately and quickly automatically corrected under the premise of not overly affecting the user experience of the projection screen through the projection of the positioning light spot and the cooperation of the collection area. It is used to solve the problems in the prior art that the collection area is limited, the projection screen with too large deviation cannot be corrected, and the user experience, correction accuracy, and efficiency cannot be considered simultaneously.

[0046] Compared with the prior art, the beneficial effects of the present invention are:

[0047] (1) Improve the efficiency of projection screen correction.

[0048] (2) Improve the accuracy of projection screen correction.

[0049] (3) Reduce energy consumption.

[0050] (4) The device has low computing power requirements.

[0051] (5) The method is simple, efficient and widely applicable.

[0052] (6) Reduce the jitter of the projection screen and improve the usage experience of the projection screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a flowchart of the method implementation of the present invention.

[0054] Figure 2 It is a schematic diagram of the projection screen and the acquisition area of Embodiment 1 of the present invention.

[0055] Figure 3 It is a schematic diagram of the square dot matrix of Embodiment 1 of the present invention.

[0056] Figure 4 It is a schematic diagram of the central area of Embodiment 1 of the present invention.

[0057] Figure 5 It is a schematic diagram of the offset distance calculation of Embodiment 1 of the present invention.

[0058] Figure 6 It is a schematic diagram of the central area and the offset distance calculation of Embodiment 1 of the present invention.

[0059] Figure 7 It is a schematic diagram of the multiple confirmations of the square dot matrix of Embodiment 1 of the present invention.

[0060] Figure 8 It is a schematic diagram of the projection screen of Embodiment 2 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] The drawings of the present invention are only for illustrative purposes and should not be construed as a limitation of the present invention. For better illustrating the following embodiments, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0062] Embodiment 1

[0063] As Figure 1As shown in the figure, this embodiment provides a method for automatically correcting a projection screen, which is used to correct the projection screen 100 to the reference position S. It includes the projection screen 100 and the acquisition area 200. A positioning light spot P is projected at a fixed position P0 on the projection screen 100. A reference position S is set within the acquisition area 200. When the positioning light spot P overlaps with the reference position S, the projection screen 100 is located at the reference position. When the positioning light spot P deviates from the reference position S and is outside the acquisition area 200, automatic correction is performed by the following method:

[0064] S1. Move the positioning light spot P from the inside out;

[0065] S2. When the positioning light spot P moves into the acquisition area 200, stop moving the positioning light spot P;

[0066] S3. Move the positioning light spot P to the reference position S, and synchronously drive the projection screen 100 to move to the reference position.

[0067] The reference position S in the acquisition area 200 can determine the position to which the projection screen 100 needs to move currently, that is, the accurate projection position. Through the positioning of the positioning light spot, the projection screen 100 can be driven to move to the accurate position, thereby achieving the effect of automatically correcting the projection screen 100. When the positioning light spot is not within the acquisition area 200, it means that the projection screen 100 has a large deviation. At this time, automatic correction cannot be performed. It is necessary to first locate the positioning light spot to the acquisition area 200 and then perform automatic correction. This can not only reduce the positioning time of the positioning light spot and improve the correction efficiency, but also reduce the moving frequency of the projection screen 100, avoid picture jitter, and ensure the use experience and visual perception of the projection. The acquisition area 200 can accurately locate the light spot, thereby achieving the effect of accurate correction.

[0068] A positioning light spot acquisition device is installed outside the boundary of the projection screen. Taking the positioning light spot acquisition device as a physical landmark, the light spot acquisition device can be a camera device or an optical signal sensor; the reference position S is a coordinate or a coordinate area near the installed camera device or optical signal sensor; the acquisition area is the acquisition range covered by the light spot acquisition device.

[0069] A more preferred embodiment is that the reference position S is a coordinate or a coordinate area on the CCD / CMOS of the projection screen where the camera device or optical sensor is installed.

[0070] The imaging device can be a camera, etc., and the light sensor can be a linear array light sensor, a area array light sensor, etc. Position the reference position near the spot collection device. Then, when the positioning spot is aligned with the corresponding reference position S in the original state, the positioning spot P will irradiate the collection range of these spot collection devices and thus form a bright spot or a bright area. Define the coordinates or coordinate area of this bright spot or bright area as the positioning spot P. When the positioning spot P moves, if the displacement is not large and it is still within the collection range of the spot collection device, the spot collection device can be used to scan the positioning spot to quickly identify the positioning spot P. Adjusting the position of the positioning spot P can adjust the position of the projection screen, thereby realizing the correction of the projection screen.

[0071] The positions of the imaging device or the light sensor and other spot collection devices do not deform with the deformation of the projection screen. Using it as the calibration of the reference position can make the correction accurate. Moreover, the collection area is the collection range covered by the spot collection device. This method can quickly establish the collection area of the reference position.

[0072] Preferably, in the step S1, specifically, change the position of the positioning spot P on the projection screen 100 to make the positioning spot P deviate from the fixed position P0 and move from the inside to the outside with the fixed position P0 as the center;

[0073] P0 is the initial position where the positioning spot is projected and also represents the initial position of the projection screen 100. In step S1, moving from the inside to the outside with the fixed position P0 as the center can make the positioning spot gradually approach the collection area 200, avoiding blindly changing the spot position. Blindly changing the spot position will not only result in low efficiency, thus affecting the correction efficiency, but also increase the energy consumption and affect the device power consumption. By moving regularly from the inside to the outside, the spot approaches the collection area 200 from far to near, which can achieve the effects of improving the correction efficiency, reducing the energy consumption, and avoiding getting into an endless loop of blind and fruitless positioning, where it is impossible to locate the collection area 200 for a long time, resulting in device overheating or even crashing.

[0074] In the step S3, first move the projection screen 100 to make the fixed position P0 coincide with the positioning spot P, and then move the positioning spot P to the reference position S, synchronously driving the projection screen 100 to move to the reference position S.

[0075] The reference position S is the center point of the collection range of the spot collection device, that is, the center point on the CCD / CMOS of the imaging device or the optical signal sensor. Using the center point of the collection range of the spot collection device directly as the reference position S for marking can more quickly locate the reference position S, thereby more quickly realizing the adjustment of the positioning spot P.

[0076] In step S3, move the projection screen 100 so that P0 coincides with the positioning light spot P. First, move the projection screen 100 back to the area where the acquisition area 200 can perform automatic correction. At this time, P0 coincides with the positioning light spot P. Subsequently, move the positioning light spot P to move it to the reference position S, which can correct the projection screen 100 to an accurate position, achieving the effect of accurately positioning the projection screen 100, and also reducing the movement frequency of the projection screen 100 to a certain extent, improving the user experience and visual perception.

[0077] Preferably, in step S1, specifically, without changing the position of the positioning light spot P on the projection screen 100, move the projection screen 100 to drive the positioning light spot P to move synchronously, and move from the inside to the outside with the initial position of the positioning light spot P as the center. During this process, the positioning light spot P always remains at the fixed position P0 on the projection screen 100.

[0078] Without changing the position of the positioning light spot P, moving the projection screen 100 to drive the positioning light spot P to move allows the user to observe the position of the projection screen 100 at any time, judge the distance from the acquisition area 200 or the reference position S according to the position of the projection screen 100, and then manual adjustment can be taken to assist in the correction of the projection screen 100, improving the correction efficiency. Moreover, when the projection screen 100 deviates too much, automatic adjustment may not be able to quickly return the projection screen 100 to the acquisition range of the acquisition area 200. Through the movement of the projection screen 100 and the timely intervention of the user, the projection screen 100 can be efficiently returned to the acquisition range of the acquisition area 200.

[0079] Preferably, the acquisition area 200 is specifically the photosensitive area of the optical signal sensor, and the reference position S is a pixel / pixel area with a fixed coordinate in the photosensitive area. In step S2, when the positioning light spot P moves into the acquisition area 200, specifically, the photosensitive area receives the optical signal of the positioning light spot P, and compares the coordinates of the pixel / pixel area P' where the optical signal is located with the coordinates of the reference position S to calculate the offset distance of the positioning light spot P on the X / Y axis in step S3.

[0080] The reference position serves as

[0081] As Figure 5 shown, according to the coordinates of the positioning light spot P and the pixel / pixel area P' where the optical signal received by the photosensitive area is located, the offset distance can be calculated. The horizontal distance and the vertical distance are Δx1 and Δy1 respectively. Then, by comparing the coordinates of the reference position S, the offset distance of P' can be calculated. The horizontal distance and the vertical distance are Δx2 and Δy2 respectively. According to the calculation results, the projection screen can be accurately corrected.

[0082] The acquisition area 200 is the photosensitive area of the optical signal sensor, which can perform pixel-level positioning on the optical signal. In step S2, when the photosensitive area receives the optical signal of the positioning light spot P, the accurate coordinates of the positioning light spot P can be obtained, and it is known that the positioning light spot P is within the range of the acquisition area 200. At this time, by calculating the offset distance between the accurate coordinates of the positioning light spot P and the coordinates of the reference position S, the offset distance of the positioning light spot P on the X / Y axis can be obtained, so that step S3 can obtain an accurate offset amount, and then the projection screen 100 can be accurately corrected. Using the photosensitive area of the optical signal sensor can improve the efficiency of acquisition and correction. Since the optical signal conduction speed is fast and the optical signal sensor is sensitive, it can achieve the effect of rapid response, greatly improving the efficiency and accuracy of automatic correction and enhancing the user experience.

[0083] Preferably, the acquisition area 200 is specifically the photosensitive area of the optical signal sensor, the reference position S is a pixel / pixel area with fixed coordinates in the photosensitive area. In step S2, when the positioning light spot P moves into the acquisition area 200, specifically, the central area 400 centered on the reference position S in the photosensitive area receives the optical signal of the positioning light spot P. Comparing the coordinates of the pixel / pixel area P” where the optical signal is located with the coordinates of the reference position S, the offset distance of the positioning light spot P on the X / Y axis in step S3 is calculated. The area of the central area 400 is smaller than that of the photosensitive area.

[0084] As Figure 4 shown, the central area 400 is located in the photosensitive area and its area is smaller than that of the photosensitive area. When the positioning light spot P moves into the range of the central area 400, that is, when the central area 400 receives the optical signal of the positioning light spot P, the positioning light spot P stops moving. At this time, it is considered that the positioning light spot P has been initially positioned at the position to be corrected. Then S3 calculates the offset amount, which can reduce the movement frequency of the positioning light spot P and the calculation amount of the offset amount, thereby improving the efficiency and speed of correction, reducing the jitter frequency of the projection screen 100, and improving the user experience and visual perception. The area of the central area 400 is smaller than that of the photosensitive area. When designing the acquisition device, a higher-precision photosensitive material can be used for the central area 400, which can reduce costs while ensuring the correction efficiency and accuracy.

[0085] As Figure 6 shown, the offset distances of the coordinates of the positioning light spot P relative to P” on the X / Y axis in step S3 are calculated as ΔX3 and Δy3 respectively, and then the projection screen can be accurately corrected to within the range of the central area. Then calculate the offset amounts of the coordinates of P” relative to the coordinates of the reference position S on the X / Y axis, that is, ΔX4 and Δy4, and then the projection screen can be accurately corrected to the reference position.

[0086] Preferably, the central region 400 is a symmetric region centered on the reference position S, and the area it occupies in the photosensitive region is less than 50%.

[0087] The central region 400 is a symmetric region centered on the reference position S, and the area it occupies in the photosensitive region is less than 50%. That is, the central region 400 is located at the relative center of the acquisition region 200, and it is a centrally symmetric region with a small area, which is beneficial for design and cost reduction. Furthermore, the moving frequency of the positioning light spot P for preliminarily correcting the projection screen 100 is increased, and the actual moving frequency of the projection screen 100 is decreased, which is beneficial for reducing the jitter of the projection screen 100 and improving the user experience and visual perception.

[0088] The reference position is the center point of the central region 400, that is, the center point on the CCD / CMOS serving as the imaging device or light sensor. Marking directly with the center point of the central region 400 as the reference position can more quickly locate the position of the reference position, and thus can more quickly realize the adjustment of the positioning light spot.

[0089] Preferably, as Figure 3 shown, in the step S1, the positioning light spot P is moved from the inside to the outside. Specifically, with the initial position of the positioning light spot P as the center, and with a fixed span Lx and Ly or a multiple of the fixed span Lx and Ly as the moving span, a square lattice 300 surrounding the initial position of the positioning light spot P is formed.

[0090] The initial position of the positioning light spot P is the position where the positioning light spot is first projected onto the projection screen 100. With a fixed span Lx and Ly or a multiple of the fixed span Lx and Ly as the moving span, the moving span of the positioning light spot P is specified. When the positioning light spot P drives the projection screen 100 to move, the movement of the projection screen 100 also has a fixed span, rather than moving disorderly and randomly, which may cause the screen to shake and bring a sense of dizziness to the user, thus improving the user experience. The square lattice 300 that specifies the moving trajectory of the positioning light spot P is beneficial for reducing the calculation amount, and thus improving the correction efficiency of the projection screen 100; it also takes into account that the photosensitive elements in the photosensitive region may be distributed in a lattice, and thus can reduce the omission of photosensitive elements and improve the accuracy of correction.

[0091] Preferably, the density of the outer layer of the square lattice 300 is less than that of the inner layer.

[0092] The density of the square lattice 300 depends on the moving span of the positioning light spot P. The positioning light spot P is projected in the form of the square lattice 300. First, a square is projected with a large span to roughly locate the position of the acquisition region. The span gradually increases with the number of times the positioning light spot P is projected, and the positioning becomes more and more accurate. When the projection screen 100 deviates too much, the positioning efficiency can be improved, and thus the correction efficiency of the projection screen 100 can be improved.

[0093] Preferably, the square dot matrix 300 includes at least three layers of structures, which are the first layer, the second layer, and the third layer from the inside to the outside. The moving span of the positioning light spot P on the first layer is the fixed spans Lx and Ly, the moving span on the second layer is 2 times the fixed spans Lx and Ly, and the moving span on the third layer is 3 times the fixed spans Lx and Ly. The covered area is between 20mm×20mm and 100mm×100mm.

[0094] The square dot matrix 300 of the positioning light spot P is divided into three layers from the inside to the outside, and the spacing increases layer by layer, that is, the span of the positioning light spot P increases by one time of the span for each layer. When the positioning light spot P drives the projection screen 100 to move, the projection screen 100 also moves with an increasing span and increases by one time layer by layer, rather than moving randomly and disorderly to cause screen shaking, so as to avoid bringing a sense of dizziness to the user and improve the use experience. The square dot matrix 300 that defines the moving trajectory of the positioning light spot P and has an increasing span layer by layer is beneficial to reducing the calculation amount, and thus improving the correction efficiency of the projection screen 100; it is also considered that the photosensitive elements in the photosensitive area may be dot-matrix distributed, and thus the omission of photosensitive elements can be reduced and the correction accuracy can be improved. Considering the pixel size of the projection screen 100 and the projection interval of the positioning light spot, the covered area is set between 20mm×20mm and 100mm×100mm, which is beneficial to improving the positioning efficiency of the positioning light spot P, reducing the projection frequency, and thus improving the correction efficiency of the projection screen 100.

[0095] Preferably, the acquisition area 200 is specifically the photosensitive area of the optical signal sensor, and the fixed spans Lx and Ly are 2 to 10 pixel sizes.

[0096] Considering product design or other factors, the projection screen 100 and the acquisition area 200 may have different sizes. The fixed spans Lx and Ly can be 2 to 10 pixel sizes, which are applicable to different sizes of the projection screen 100 and the acquisition area 200. Setting the fixed spans Lx and Ly in units of pixels can improve the acquisition success rate of the photosensitive area, and thus improve the positioning accuracy and the correction efficiency of the screen.

[0097] Preferably, the following steps are further included between steps S2 and S3:

[0098] S23 Reconfirm whether the positioning light spot P is within the acquisition area 200.

[0099] As Figure 7 shown, in the square dot matrix, the 9th movement of the positioning light spot P has been within the acquisition area. At this time, the positioning light spot P stops moving, but to ensure the stability and accuracy of the correction, the coordinates of the positioning light spot P are offset to near the reference position of the positioning area, and the light spot is projected again to confirm whether it is already within the acquisition area.

[0100] The positioning light spot P may be interfered with, affecting the correction of the projection screen 100. Therefore, when collecting the positioning light spot P, the positioning light spot P is confirmed multiple times to ensure that the positioning light spot P is accurately collected by the collection area 200, thereby improving the stability and accuracy of the correction, avoiding collection errors, and preventing the projection screen 100 from making incorrect or ineffective movements, which affects the user experience.

[0101] Preferably, the step S23 is specifically to project the positioning light spot P again or multiple times at the position where the movement of the positioning light spot P stops, and determine whether the collection area 200 can receive the signal of the positioning light spot P.

[0102] Projecting the positioning light spot P again or multiple times at the position where the movement of the positioning light spot P stops to ensure that the positioning light spot P is collected by the collection area 200 again can improve the stability and accuracy of the correction, avoid collection errors, and prevent the projection screen 100 from making incorrect or ineffective movements, which affects the user experience. Projecting the positioning light spot P again can enable the positioning light spot P to be successfully positioned in the collection area 200 with the least number of movement frequencies, improving the positioning efficiency, and thus improving the correction efficiency of the projection screen 100. The positioning light spot P can also be projected multiple times to ensure the positioning accuracy, and thus improve the correction accuracy of the projection screen 100.

[0103] Preferably, the step S23 is specifically to project the positioning light spot P again or multiple times at the corresponding position on the outer layer of the position where the movement of the positioning light spot P stops, and determine whether the collection area 200 can receive the signal of the positioning light spot P.

[0104] When the span of the positioning light spot P is fixed, the positioning light spot P can be directly projected again or multiple times at the corresponding position on the outer layer of the square dot matrix, reducing unnecessary projections, reducing energy consumption, and improving the correction efficiency of the projection screen 100.

[0105] Embodiment 2

[0106] This embodiment is based on the same inventive concept as Embodiment 1 and provides a method for automatically correcting a projection screen for correcting multiple projection screens.

[0107] As Figure 8 shown, there are two projection screens, and each projection screen includes an effective screen 101 and a dark area screen 102 corresponding to the effective screen 101. The dark area screen 102 is located around the effective screen 101. Adjacent projection screens are fused to form a fusion area. Adjacent effective screens 1 form an effective fusion area 103, and adjacent dark area screens 102 form an ineffective fusion area 104.

[0108] The effective screen 101 is used to display the projected content, while the dark area screen 102 does not display the projected content. The effective screen 101 is projected onto the projection carrier, and the dark area screen 102 is located at the four peripheral edges of the projection carrier.

[0109] Each of the projected screens has its corresponding reference position, which is the point marked on the dark area screen corresponding to each projected screen in the aligned state of the effective fusion area 103; on the dark area screen 102 of each projected screen, a positioning light spot P aligned with the reference position of the corresponding projected screen in the original state is displayed, and the positioning light spot P is linked to the effective screen 101 of the projected screen it corresponds to.

[0110] The positioning light spot P is used to adjust the corresponding effective screen 101. It can be understood that the projected screen and the corresponding positioning light spot P are both projected by the same projector. Therefore, each positioning light spot P is linked to the effective screen 101 of the projected screen it corresponds to. Specifically, when the position of the positioning light spot P is adjusted, the position of the linked effective screen 101 also changes. Since the reference position is marked on the dark area screen 102 corresponding to each projected screen in the aligned state of the effective fusion area 103, the positioning light spot aligned with the reference position in the original state will fall into the dark area screen 102 of the projected screen. That is, the position of the effective screen 101 can be adjusted by adjusting the position of the positioning light spot P on the dark area screen 102, so as to correct the projected screen.

[0111] The specific steps for correcting the projected screen are as follows:

[0112] S1. Move the positioning light spot P from the inside to the outside;

[0113] S2. When the positioning light spot P moves into the acquisition area, stop moving the positioning light spot P;

[0114] S3. Move the positioning light spot P to the reference position S, and synchronously drive the projected screen to move to the reference position.

[0115] In the specific implementation process, the reference position can be pre-marked. When the effective fusion area 103 of the projection screen is aligned, a point is selected as the reference position for each dark area image of the projection screen in advance, and its position information is recorded after the reference position is selected. The reference position and the effective image 101 are not linked. At the same time, when the effective fusion area 103 of the projection screen is aligned, a positioning light spot P aligned with the corresponding reference position is displayed on each dark area image 102 of the projection screen. This is the original state of the positioning light spot P. Since the positioning light spot P is located in the dark area image 102, when the projector projects the content to be played, the alignment of the projection screen can also be performed without jumping to a specific preset debugging mode for correction and alignment. During the correction process, the effective image 101 can still display the projection playback content, which does not affect the viewing experience of the audience and simplifies the correction process.

[0116] Preferably, when there are two projectors, at least one positioning light spot P is projected on the dark area image 102 of one projection screen, that is, at least two positioning light spots P projected by different projectors are displayed. By adjusting the positions of these two positioning light spots P, the two positioning light spots P are respectively aligned with the corresponding reference positions, so that the two effective images 101 with alignment linkage are realized, and the splicing and fusion of adjacent projection screens are achieved, so that the two projection screens can jointly display the complete and normal projection playback content.

[0117] Embodiment 3

[0118] This embodiment is based on the same inventive concept as Embodiment 2 and provides a projection screen correction method. Other steps of this embodiment are the same as those of Embodiment 2, except that it further includes:

[0119] A collection area is established around the reference position of each projection screen;

[0120] In order to quickly locate and accurately collect the positioning light spot, the position of the reference position can be preset. A collection area can be established around the reference position, and the positioning light spot is collected in the collection area. Once the positioning light spot is collected, the position of the positioning light spot can be quickly adjusted, so that the effective image with linkage can be quickly adjusted, and thus the correction can be quickly completed.

[0121] Preferably, there are various implementation manners for establishing the collection area based on the reference position. For example, a collection area is established with the reference position as the center; or, the reference position is used as one of the corner points of the collection area to establish the collection area; or, the reference position is used as the midpoint of the boundary of the collection area to establish the collection area; or, a coordinate system is established with the reference position as the coordinate origin, and a collection area is established near the ineffective fusion area 104 based on this coordinate system, so that the collection area partially overlaps with the ineffective fusion area 104 and there is a coordinate correspondence between the collection area and the reference position.

[0122] Collect the positioning light spot in the collection area.

[0123] It can be understood that when there are at least two projectors, a collection area is established for the reference position corresponding to each projection screen. Then, the number of positioning light spots collected by the two collection areas is at least two. Each positioning light spot is linked to a corresponding effective screen 101. Adjust the positions of at least two positioning light spots respectively linked to different effective screens 101, so as to adjust the alignment of the effective screens 101.

[0124] Collect the positioning light spot and obtain the position information of the positioning light spot;

[0125] The position information includes the relative distance, relative angle, etc. between the positioning light spot and the reference position. Based on the obtained position information, move the positioning light spot to the reference position so that the positioning light spot coincides with the reference position, realize the alignment of the fusion area, and then complete the splicing of adjacent effective screens 101.

[0126] Adjust the position information of the positioning light spot P to match the position information of the reference position; each projection screen moves with the positioning light spot, so as to adjust the position of the effective screen 101 to correct the effective fusion area 103.

[0127] When the position of the positioning light spot moves, the corresponding projection screen and effective screen 101 linked to it will also be driven. By aligning the positions of the positioning light spot and the reference position, the position of the effective screen 101 is adjusted, so that two adjacent effective screens 101 are also aligned with each other, so as to align the effective fusion area 103, and then complete the correction of multiple projection screens, so that adjacent projection screens can display complete projection playback content.

[0128] At the same time, the positioning light spot is located on the dark area screen 102 that does not display the projection playback content. During adjustment, it can not affect the display of the projection playback content on the effective screen 101, that is, when the projector projects the projection playback content to be played, the alignment and correction of the projection screen can still be carried out, so that the audience watching the playback content can obtain a good viewing experience.

[0129] In the specific implementation process, the reference position is in the invalid fusion area, and at least part of the collection area overlaps with the invalid fusion area of the corresponding projection screen. Mark the reference position based on the invalid fusion area, collect the positioning light spot in the collection area established based on the reference position, and adjust the collected positioning light spot to more accurately link the alignment of the effective fusion area.

[0130] In the specific implementation process, the effective picture 101 is projected onto the projection carrier. Physical landmark points are provided outside the boundary of the projection carrier. When the effective fusion area 103 is in the aligned state, any point near the physical landmark point is selected as the reference position from the dark area picture 102 of each projection picture. The physical landmark point is an actual physical point on the projection carrier. Locating the reference position based on this physical landmark point can quickly set the reference position of each projection picture. In actual application, when the effective fusion area 103 is in the aligned state, each projection picture projects a light spot. Move the light spot to align it with the corresponding physical landmark point, and then obtain the position of the light spot in this state. Take the position where the light spot is located as the position of the reference position. The position of the reference position is fixed and not linked to the effective picture 101.

[0131] A light spot acquisition device is installed outside the boundary of the projection carrier. Taking the light spot acquisition device as the physical landmark point, the light spot acquisition device can be a camera device or a light sensor; the reference position is a coordinate or a coordinate area near the installation of the camera device or the light sensor in the dark area picture 102 of each projection picture when the effective fusion area 103 is in the aligned state; the acquisition area is the acquisition range covered by the light spot acquisition device.

[0132] Embodiment 4

[0133] This embodiment provides a projection picture automatic correction system, including a projection picture and an acquisition area. A positioning light spot P is projected at a fixed position P0 on the projection picture. A reference position S is set in the acquisition area. When the positioning light spot P overlaps with the reference position S, the projection picture is located at the reference position. When the positioning light spot P deviates from the reference position S and is outside the acquisition area, automatic correction is performed, including:

[0134] A positioning light spot moving module for moving the positioning light spot P from the inside out;

[0135] A positioning light spot confirmation module for confirming that when the positioning light spot P moves into the acquisition area, stop moving the positioning light spot P; a projection picture synchronization module for moving the positioning light spot P to the reference position S and synchronously driving the projection picture to move to the reference position.

[0136] The projection picture automatic correction system of this embodiment is based on the same inventive concept as Embodiment 1 and will not be elaborated here.

[0137] Under the condition that the acquisition area does not need to be designed too large, through the projection of the positioning light spot and the cooperation of the acquisition area, without overly affecting the use experience of the projection screen, the projection screen can be automatically corrected accurately and quickly. It is used to solve the problems in the prior art that the acquisition area is limited, the projection screen with too large deviation cannot be corrected, and the use experience, correction accuracy and efficiency cannot be considered at the same time. The projection screen automatic correction system of this embodiment achieves the technical effects of improving the efficiency of projection screen correction, improving the accuracy of projection screen correction, reducing energy consumption, having low computing power requirements for equipment, being simple and efficient in system, having wide applicability, reducing the jitter of the projection screen, and improving the use experience of the projection screen.

[0138] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A method for automatically correcting a projection screen, which is used to correct the projection screen to a reference position, including a projection screen and a collection area. A positioning light spot P is projected at a fixed position P0 on the projection screen, and a reference position S is set in the collection area. When the positioning light spot P overlaps with the reference position S, the projection screen is located at the reference position. It is characterized in that When the positioning light spot P deviates from the reference position S and is outside the collection area, automatic correction is performed by the following method: S1. Move the positioning light spot P from the inside out. Specifically, a square dot matrix centered on the initial position of the positioning light spot P is formed. The square dot matrix includes at least three layers of structures, which are the first layer, the second layer, and the third layer from the inside out. The positioning light spot P moves with a fixed span Lx and Ly or multiples of the fixed span Lx and Ly on the first layer, the second layer, and the third layer. The moving spans of the positioning light spot P on the first layer, the second layer, and the third layer are all different, and the covered area is between 20mm×20mm and 100mm×100mm. S2. When the positioning light spot P moves into the collection area, stop moving the positioning light spot P. S3. According to the relative offset distance between the current position of the positioning light spot P and the reference position S, move the positioning light spot P to the reference position S, and synchronously drive the projection screen to move to the reference position.

2. The method according to claim 1, wherein in step S1, specifically, the position of the positioning light spot P on the projection screen is changed to make the positioning light spot P deviate from the fixed position P0, and it moves from the inside out with the fixed position P0 as the center. in step S3, first move the projection screen to make the fixed position P0 coincide with the positioning light spot P, and then move the positioning light spot P to the reference position S, and synchronously drive the projection screen to move to the reference position.

3. The method according to claim 1, wherein in step S1, specifically, the position of the positioning light spot P on the projection screen is not changed, and the projection screen is moved to drive the positioning light spot P to move synchronously. It moves from the inside out with the initial position of the positioning light spot P as the center. During this process, the positioning light spot P always remains at the fixed position P0 on the projection screen.

4. The method according to claim 1, wherein the collection area is specifically the photosensitive area of an optical signal sensor, the reference position S is a pixel / pixel area with a fixed coordinate in the photosensitive area. In step S2, when the positioning light spot P moves into the collection area, specifically, the photosensitive area receives the optical signal of the positioning light spot P, and the coordinates of the pixel / pixel area P' where the optical signal is located are compared with the coordinates of the reference position S to calculate the offset distance of the positioning light spot P on the X / Y axis in step S3.

5. The method according to claim 1, wherein The acquisition area is specifically the photosensitive area of the optical signal sensor. The reference position S is a pixel / pixel area with fixed coordinates within the photosensitive area. In step S2, when the positioning light spot P moves into the acquisition area, specifically, the central area centered on the reference position S in the photosensitive area receives the optical signal of the positioning light spot P. Using the coordinates of the pixel / pixel area P’’ where the optical signal is located, compare with the coordinates of the reference position S, and calculate the offset distance of the positioning light spot P on the X / Y axis in step S3. The area of the central area is smaller than that of the photosensitive area.

6. The method according to claim 5, wherein The central area is a symmetric area centered on the reference position S, and the area it occupies in the photosensitive area is less than 50%.

7. The method according to claim 1, wherein The density of the outer layer of the square dot matrix is less than that of the inner layer.

8. The method according to claim 1, characterized in that, The moving span of the positioning light spot P on the first layer is the fixed spans Lx and Ly, the moving span on the second layer is 2 times the fixed spans Lx and Ly, and the moving span on the third layer is 3 times the fixed spans Lx and Ly.

9. The method according to claim 8, wherein The acquisition area is specifically the photosensitive area of the optical signal sensor, and the fixed spans Lx and Ly are 2 to 10 pixel sizes.

10. The method according to any one of claims 1 to 6, characterized in that, The following steps are further included between step S2 and step S3: S23 Re-confirm whether the positioning light spot P is within the acquisition area.

11. The method according to claim 10, wherein Step S23 specifically projects the positioning light spot P again or multiple times at the position where the movement of the positioning light spot P stops, and determines whether the acquisition area can receive the signal of the positioning light spot P.

12. The method according to claim 10, wherein Step S23 specifically projects the positioning light spot P again or multiple times at the corresponding outer position of the position where the movement of the positioning light spot P stops, and determines whether the acquisition area can receive the signal of the positioning light spot P.

13. An automatic correction system for a projection screen, comprising a projection screen and a collection area. A positioning light spot P is projected at a fixed position P0 on the projection screen. A reference position S is set within the collection area. When the positioning light spot P overlaps with the reference position S, the projection screen is located at the reference position. When the positioning light spot P deviates from the reference position S and is outside the collection area, automatic correction is performed. It is characterized in that, Including: A positioning light spot moving module for moving the positioning light spot P from the inside out. Specifically, a square dot matrix centered on the initial position of the positioning light spot P is formed. The square dot matrix includes at least three-layer structures, which are the first layer, the second layer, and the third layer from the inside out. The positioning light spot P moves with the fixed spans Lx and Ly or multiples of the fixed spans Lx and Ly on the first layer, the second layer, and the third layer. The moving spans of the positioning light spot P on the first layer, the second layer, and the third layer are all different, and the covered area is between 20mm×20mm and 100mm×100mm. A positioning light spot confirmation module for confirming to stop moving the positioning light spot P when the positioning light spot P moves into the acquisition area. A projection screen synchronization module for moving the positioning light spot P to the reference position S according to the relative offset distance between the current position of the positioning light spot P and the reference position S, and synchronously driving the projection screen to move to the reference position.

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