WO2022205811A1 - 投影显示方法、装置及投影设备 - Google Patents

投影显示方法、装置及投影设备 Download PDF

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Publication number
WO2022205811A1
WO2022205811A1 PCT/CN2021/120682 CN2021120682W WO2022205811A1 WO 2022205811 A1 WO2022205811 A1 WO 2022205811A1 CN 2021120682 W CN2021120682 W CN 2021120682W WO 2022205811 A1 WO2022205811 A1 WO 2022205811A1
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coordinate
projection
projection picture
picture
coordinates
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PCT/CN2021/120682
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English (en)
French (fr)
Inventor
张立造
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成都极米科技股份有限公司
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Publication of WO2022205811A1 publication Critical patent/WO2022205811A1/zh

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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]
    • 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
    • H04N9/317—Convergence or focusing systems

Definitions

  • the present application relates to the field of projection technology, and in particular, to a projection display method, device, and projection equipment.
  • the keystone correction of projection usually has two ways: manual and automatic.
  • Manual means that the user calls up the adjustment setting menu, and adjusts the shape of the picture by manually controlling the positions of several vertices of the projection picture;
  • the module collects the projection surface information, and automatically corrects the picture into a rectangle by automatically compensating for the projection position.
  • digital adjustment to adjust the image, that is, to change the pixel position of the projected picture through a software algorithm.
  • This method has two drawbacks: the adjusted picture resolution and image quality will Loss due to zooming; after adjustment, the normal display content will become smaller, but the internal structure of the optomechanical cannot be completely shielded, so the user can see obvious gray borders around the normal screen content. The smaller the screen is adjusted, the gray borders. bigger.
  • Embodiments of the present application provide a projection display method, device, and projection device, so as to at least solve the technical problems in the related art that when performing keystone correction on projection, the resolution loss is relatively large and the gray-edge effect is obvious.
  • a projection display method comprising: determining a first coordinate of a first projection picture and a second coordinate of a second projection picture in a projector, wherein the first projection picture is the initial projection picture when the projector is projecting, and the second projection picture is the projection picture corrected by the projector; the third coordinate of the third projection picture is determined according to the first coordinate and the second coordinate , wherein the third projection picture is obtained by performing optical zooming and zooming on the first projection picture; determining a target zoom position according to the first coordinate and the third coordinate, and controlling the target zoom position according to the target zoom position
  • the projector performs optical zooming; a mapping relationship is determined according to the first coordinate and the third coordinate, and the second coordinate is calculated according to the mapping relationship to obtain a fourth coordinate;
  • the fourth projection picture is projected onto the projection plane for display.
  • the coordinate information of each corner point of the first projection picture is determined to obtain the first coordinates; the coordinate information of each corner point of the second projection picture is determined to obtain the second coordinates.
  • determining an optical zoom reference point the optical zoom reference point being a preset reference point for performing optical zoom processing on the projection picture; connecting the optical zoom reference point and each of the first projection pictures corner points, multiple line segments are obtained, and the first distance corresponding to each line segment in the multiple line segments is determined; based on each corner point of the second projection picture, a straight line parallel to the boundary of the first projection picture is drawn, intersecting the plurality of line segments at a plurality of intersection points; for any intersection point of the plurality of intersection points, determining a second distance from the intersection point to the optical zoom reference point, and calculating the second distance and the The ratio between the first distances corresponding to the line segment where the intersection point is located; the maximum ratio is determined from the obtained multiple ratios, and the third coordinate of the third projection screen is determined according to the maximum ratio and the first coordinate.
  • the coordinate information of each corner point of the third projection image is determined according to the coordinate information of each corner point of the first projection image and the maximum ratio, and the third coordinate is obtained.
  • the zoom ratio is: for any zoom position, when projecting at the zoom position, the fifth projection picture obtained is the fifth The ratio between the fifth distance from the corner point to the optical zoom reference point and the first distance corresponding to the line segment where the fifth corner point is located.
  • a homography transformation matrix corresponding to when the third projection picture is mapped to the first projection picture is determined according to the first coordinates and the third coordinates; according to the homography transformation matrix pair The second coordinate is calculated to obtain the fourth coordinate.
  • a projection display device including: a first determination module configured to determine the first coordinates of the first projection picture and the second coordinates of the second projection picture in the projector , wherein the first projection picture is the initial projection picture when the projector is projecting, and the second projection picture is the corrected projection picture of the projector; a second determining module is used for determining according to the first The coordinates and the second coordinates determine the third coordinates of the third projection picture, wherein the third projection picture is obtained by performing optical zooming and zooming on the first projection picture; the zoom module is used for according to the first coordinates and the third coordinate to determine the target zoom position, and control the projector to perform optical zooming according to the target zoom position; the calculation module is used for determining the mapping relationship according to the first coordinate and the third coordinate, and according to the The mapping relationship calculates the second coordinate to obtain the fourth coordinate; the display module is used for projecting the fourth projection picture corresponding to the fourth coordinate to the projection plane for display.
  • a first determination module configured to determine the first coordinates of the first projection picture and
  • a projection device including: a processor; a memory connected to the processor and configured to provide the processor with instructions for processing the following processing steps: determining a projector The first coordinates of the first projection picture and the second coordinates of the second projection picture in , wherein the first projection picture is the initial projection picture when the projector projects, and the second projection picture is the The projection image after calibration is obtained; the third coordinate of the third projection image is determined according to the first coordinate and the second coordinate, wherein the third projection image is obtained by performing optical zooming and zooming on the first projection image.
  • a non-volatile storage medium is further provided, the non-volatile storage medium includes a stored program, wherein the non-volatile storage medium is controlled when the program runs
  • the device where the storage medium is located executes the above-mentioned projection display method.
  • the image is optically zoomed and zoomed
  • the smallest third projection image that can cover the second projected image, and the target zoom position is determined to perform optical zooming without resolution loss during the zooming process; in order to keep the final projection area unchanged, calculate the third projection image.
  • the position mapping relationship between the projection picture and the first projection picture, according to the mapping relationship, the coordinates of the second projection picture are adjusted, and then the projection display is performed. This process greatly reduces the resolution loss and the generated grayscale during the projection correction process. edge effect.
  • FIG. 1 is a schematic flowchart of a projection display method according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a projected picture in a projector according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of a projection image corresponding to different zoom positions according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of determining a third projection picture according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a relationship between a zoom position and a zoom ratio according to an embodiment of the present application
  • FIG. 6 is a schematic diagram of a projected picture in a projector according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of an effect after correction of a projection image according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a projection display device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a projection device according to an embodiment of the present application.
  • Keystone Correction In the actual projection process, in order to ensure that the final projection screen viewed by the user appears as a rectangle under different projection angles and different projection distances, it is necessary to adjust the projection screen area. This process is called projection. keystone correction. Usually, there will be resolution loss and gray-edge effect in the keystone correction process. The larger the correction ratio, the more obvious the resolution loss and gray-edge effect.
  • Optical zoom relies on the structure of the optical lens to achieve zooming.
  • the zoom lens can make the overall projected image larger or smaller by changing the focal length. At this time, all pixels in the projected image are completely displayed, which is different from the keystone correction process. There is no loss of resolution during optical zooming.
  • a projection display method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings may be executed in a computer system such as a set of computer-executable instructions, and although the flowchart is shown in the flowchart A logical order is shown, but in some cases steps shown or described may be performed in a different order than shown.
  • FIG. 1 is a schematic flowchart of a projection display method according to an embodiment of the present application. As shown in FIG. 1 , the method includes the following steps:
  • Step S102 determining the first coordinates of the first projection picture and the second coordinates of the second projection picture in the projector, wherein the first projection picture is the initial projection picture when the projector is projecting, and the second projection picture is the projector calibration the projected screen after.
  • the relationship between the first projection picture and the second projection picture is shown in FIG. 2 , where 21 represents the first projection picture and 22 represents the second projection picture.
  • the first projection picture 21 is in the shape of a rectangle as a whole, but usually because the projector adopts the side projection method and other reasons, after directly projecting the first projection picture onto the projection plane, the displayed projection picture is non-rectangular; The non-rectangular projection picture is adjusted to a rectangle, and at the same time, effects such as projection obstacle avoidance can be realized.
  • the first projection picture 21 in the projector can be adjusted to the second projection picture 22.
  • the fitted projection image that completes keystone correction and projection obstacle avoidance is used for subsequent calculation processing and will not be projected to the projection plane for display.
  • the coordinate information of each corner point of the first projection picture is determined to obtain the first coordinate; the coordinate information of each corner point of the second projection picture is determined to obtain the second coordinate .
  • the first coordinates are the coordinates of the four corners of the first projection picture, and the second coordinates are the coordinates of the four corners of the second projection picture.
  • Step S104 determining the third coordinate of the third projection image according to the first coordinate and the second coordinate, wherein the third projection image is obtained by performing optical zooming on the first projection image.
  • the projection image can be optically zoomed and zoomed first. Therefore, it is necessary to first determine the smallest projection image that can cover the second projection image after optically zoomed and zoomed the first projection image, that is, the third projection image. screen.
  • the third projection picture and its corresponding third coordinates may be determined through the following steps.
  • Step S1041 Determine an optical zoom reference point, where the optical zoom reference point is a preset reference point for performing optical zoom processing on the projection image.
  • FIG 3 shows the movement trajectory of the corresponding projection picture of the optical zoom lens of the projector during the optical zooming process, wherein 31, 32, 33, 34, 35, and 36 are the projection pictures corresponding to different zoom positions, respectively.
  • o is the optical zoom reference point. It should be noted that the position of the optical zoom center o in the figure is for illustration only. It can be anywhere in the screen or even outside the screen. The actual position is determined according to the specific optical design.
  • Step S1042 connecting the optical zoom reference point and each corner point of the first projection image to obtain a plurality of line segments, and determining a first distance corresponding to each of the plurality of line segments.
  • Fig. 4 Take Fig. 4 as an example, in which, 41 represents the first projection picture, the corresponding four corner points are A, B, C, D, and o is the optical zoom reference point, which is connected to oA, oB, oC, and oD respectively, and determines their respective first distances.
  • Step S1043 drawing a straight line parallel to the boundary of the first projection picture based on each corner point of the second projection picture, and intersecting with a plurality of line segments at a plurality of intersection points.
  • FIG. 4 represents the second projection picture, and through the four corner points A1, B1, C1, D1 of the second projection picture 42, straight lines parallel to the boundaries AB, BC, CD, DA of the first projection picture are drawn, respectively. It intersects with oA at points a, b, c, and d, intersects with oB at points e, f, and g, intersects with oD at points h, i, and intersects with oC at point j.
  • Step S1044 for any intersection point among the plurality of intersection points, determine the second distance from the intersection point to the optical zoom reference point, and calculate the ratio between the second distance and the first distance corresponding to the line segment where the intersection point is located.
  • Step S1045 Determine the maximum scale from the obtained multiple scales, and determine the third coordinate of the third projection screen according to the maximum scale and the first coordinate. Specifically, the coordinate information of each corner point of the third projection picture is determined according to the coordinate information and the maximum scale of each corner point of the first projection picture, and the third coordinates are obtained.
  • Step S106 determining the target zoom position according to the first coordinate and the third coordinate, and controlling the projector to perform optical zooming according to the target zoom position.
  • the zoom ratio is: for any zoom position, use the zoom position During projection, the obtained ratio between the fifth distance from the fifth corner of the fifth projection image to the optical zoom reference point and the first distance corresponding to the line segment where the fifth corner is located.
  • the second correlation relationship between the zoom position and the control parameters of the zoom control mechanism can be determined first, and the control parameters of the zoom control mechanism can be adjusted according to the second correlation relationship and the target zoom position
  • the zoom control mechanism is a module used to adjust the zoom position in the projector.
  • the second correlation relationship between the zoom position and the step angle of the stepping motor in the zoom control mechanism, or the control parameters such as the number of motor steps of the gear motor can be determined, and then according to the target zoom position b and the second correlation relationship
  • the specific control parameters of the zoom control mechanism are adjusted, and the zoom control mechanism is driven to move to a corresponding position, and at this time, the first projection picture will be zoomed into the third projection picture.
  • Step S108 determining a mapping relationship according to the first coordinate and the third coordinate, and calculating the second coordinate according to the mapping relationship to obtain a fourth coordinate.
  • Step S110 project the fourth projection image corresponding to the fourth coordinate to the projection plane for display.
  • a homography transformation matrix corresponding to when the third projection picture is mapped to the first projection picture may be determined according to the first coordinates and the third coordinates; The second coordinate is calculated to obtain the fourth coordinate; and then the fourth projection image corresponding to the fourth coordinate is projected onto the projection plane for display.
  • the projection image is projected onto the projection plane for display.
  • 61 is the first projection picture before zooming
  • 62 is the second projection picture before zooming.
  • the first projection picture 61 is zoomed into the third projection picture 63, but at this time
  • the second projection picture 62 will also be scaled to a projection picture of 64.
  • the two projection images 62 overlap.
  • FIG. 7 is a schematic diagram showing the comparison of the effects of projection correction after applying the projection display method of the present embodiment and projection correction in the related art, wherein the left side is the projection correction in the related art, 71 is the initial projection image, and 72 is the correction After the projection screen, it can be seen that a large resolution loss and gray border effect have been produced after the correction; the right side is the projection correction after applying the projection display method of this implementation, 73 is the initial projection screen, and 74 is the corrected projection. It can be seen that the resolution loss and gray fringing effect after correction are significantly reduced.
  • a projection display device for implementing the above projection display method is also provided.
  • the device includes a first determination module 80 , a second determination module 82 , a zoom module 84 , and a calculation module 96 and display module 88, where:
  • the first determination module 80 is configured to determine the first coordinates of the first projection picture and the second coordinates of the second projection picture in the projector, wherein the first projection picture is the initial projection picture when the projector is projected, and the second projection picture is the initial projection picture when the projector is projected. The picture is the projected picture after the projector has been corrected.
  • the coordinate information of each corner point of the first projection picture is determined respectively to obtain the first coordinates; the coordinate information of each corner point of the second projection picture is determined to obtain the second coordinates. Since the projection picture is usually a rectangle, the first coordinates are the coordinates of the four corners of the first projection picture, and the second coordinates are the coordinates of the four corners of the second projection picture.
  • the second determining module 82 is configured to determine the third coordinate of the third projection image according to the first coordinate and the second coordinate, wherein the third projection image is obtained by performing optical zooming and zooming on the first projection image.
  • the projection image in order to minimize the generated gray borders, can be optically zoomed and zoomed first. Therefore, it needs to be determined that the first projection image can cover the second projection image after being optically zoomed and zoomed.
  • the smallest projected image of the projected image that is, the third projected image.
  • an optical zoom reference point is determined, and the optical zoom reference point is a preset reference point for performing optical zoom processing on the projection screen; connecting the optical zoom reference point and each corner point of the first projection screen to obtain a plurality of line segments , and determine the first distance corresponding to each of the multiple line segments; draw a straight line parallel to the boundary of the first projected image based on each corner point of the second projection image, and intersect the multiple line segments at multiple intersections; For any intersection point, determine the second distance from the intersection point to the optical zoom reference point, and calculate the ratio between the second distance and the first distance corresponding to the line segment where the intersection point is located; determine the largest ratio from the obtained multiple ratios, And according to the maximum scale and the first coordinate, the third coordinate of the third projection picture is determined.
  • the zoom module 84 is configured to determine the target zoom position according to the first coordinate and the third coordinate, and control the projector to perform optical zooming according to the target zoom position.
  • the zoom ratio is: for any zoom position, use the zoom position During projection, the obtained ratio between the fifth distance from the fifth corner of the fifth projection image to the optical zoom reference point and the first distance corresponding to the line segment where the fifth corner is located. Afterwards, the proportional relationship between the first coordinate and the third coordinate can be determined, and the target zoom position is determined according to the proportional relationship and the first correlation relationship.
  • the second correlation relationship between the zoom position and the control parameters of the zoom control mechanism can be determined first, and the control parameters of the zoom control mechanism can be adjusted according to the second correlation relationship and the target zoom position
  • the zoom control mechanism is a module used to adjust the zoom position in the projector.
  • the calculation module 86 is configured to determine the mapping relationship according to the first coordinate and the third coordinate, and calculate the second coordinate according to the mapping relationship to obtain the fourth coordinate.
  • the display module 88 is used for projecting the fourth projection picture corresponding to the fourth coordinate to the projection plane for display.
  • the coordinate information of the second projection picture needs to be adjusted.
  • the homography transformation matrix corresponding to when the third projection picture is mapped to the first projection picture can be determined according to the first coordinate and the third coordinate; then the second coordinate is calculated according to the homography transformation matrix to obtain the fourth coordinate; The fourth projection picture corresponding to the fourth coordinate is projected onto the projection plane for display.
  • each module in the projection display device in this embodiment of the present application corresponds to the implementation steps of the projection display method in Embodiment 1. Since Embodiment 1 has been described in detail, some of the modules in this embodiment For details not shown, reference may be made to Embodiment 1, which will not be repeated here.
  • the projection device 90 includes a projector 900 with a zoom control mechanism, a processor 902 and a memory 904, wherein:
  • the memory 904 is connected to the processor 902, and is used for providing the processor 902 with instructions for processing the following processing steps: determining the first coordinates of the first projection picture and the second coordinates of the second projection picture in the projector, wherein the first projection The picture is the initial projection picture when the projector is projected, and the second projection picture is the projection picture corrected by the projector; the third coordinate of the third projection picture is determined according to the first coordinate and the second coordinate, wherein the third projection picture is determined by the first coordinate and the second coordinate.
  • a projection image is obtained after optical zooming and zooming; the target zoom position is determined according to the first coordinate and the third coordinate, and the projector is controlled to perform optical zooming according to the target zoom position; the mapping relationship is determined according to the first coordinate and the third coordinate, and according to the mapping The relationship calculates the second coordinate to obtain the fourth coordinate; the fourth projection picture corresponding to the fourth coordinate is projected onto the projection plane for display.
  • the projector 900 with a zoom control mechanism is used to receive an instruction from the processor, adjust the control parameters of the zoom control mechanism according to the instruction, and project the projection image onto the projection plane for display.
  • a non-volatile storage medium includes a stored program, wherein when the program runs, the device where the non-volatile storage medium is located is controlled to perform the above-mentioned projection display method.
  • the device where the non-volatile storage medium is located is controlled to perform the following steps: determining the first coordinates of the first projection picture and the second coordinates of the second projection picture in the projector, wherein the first projection The picture is the initial projection picture when the projector is projected, and the second projection picture is the projection picture corrected by the projector; the third coordinate of the third projection picture is determined according to the first coordinate and the second coordinate, wherein the third projection picture is determined by the first coordinate and the second coordinate.
  • a projection image is obtained after optical zooming and zooming; the target zoom position is determined according to the first coordinate and the third coordinate, and the projector is controlled to perform optical zooming according to the target zoom position; the mapping relationship is determined according to the first coordinate and the third coordinate, and according to the mapping The relationship calculates the second coordinate to obtain the fourth coordinate; the fourth projection picture corresponding to the fourth coordinate is projected onto the projection plane for display.
  • the disclosed technical content can be implemented in other ways.
  • the device embodiments described above are only illustrative, for example, the division of units may be a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or integrated into Another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of units or modules, and may be in electrical or other forms.
  • Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.
  • the integrated unit if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a computer-readable storage medium.
  • the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , which includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes .

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Abstract

本申请公开了一种投影显示方法、装置及投影设备。其中，该方法包括：确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，第一投影画面为投影仪投影时的初始投影画面，第二投影画面为投影仪校正后的投影画面；依据第一坐标及第二坐标确定第三投影画面的第三坐标，其中，第三投影画面由第一投影画面进行光学变焦缩放后得到；依据第一坐标及第三坐标确定目标变焦位置，并依据目标变焦位置控制投影仪进行光学变焦；依据第一坐标及第三坐标确定映射关系，并依据映射关系对第二坐标进行计算，得到第四坐标；将第四坐标对应的第四投影画面投射至投影平面进行显示。

Description

投影显示方法、装置及投影设备 技术领域
本申请涉及投影技术领域，具体而言，涉及一种投影显示方法、装置及投影设备。
背景技术
在实际的投影使用过程中，为了保证在不同投射角度、不同投影距离的情况下，使用户观看到的最终投影画面呈现为矩形，需要对投影画面区域进行调整，该过程称为投影的梯形校正。
在相关技术中，投影的梯形校正通常有手动和自动两种方式，手动即用户调出调校设置菜单，通过手动控制投影画面几个顶点的位置，来调整画面形状；自动方式即通过图像采集模块采集到投影面信息，通过对投影位置的自动补偿来自动将画面校正成矩形。然而无论是手动还是自动，其都是采用数字调校的方式来调节图像，即通过软件算法改变投影出的画面像素位置，这种方式存在两个弊端：调节后的画面分辨率和画质会由于缩放而损失；调节后，正常显示内容会变小，但光机内部结构由于无法做到完全遮光，所以用户能看到正常画面内容四周有明显的灰边，画面调的越小，灰边越大。
针对上述的问题，目前尚未提出有效的解决方案。
发明内容
本申请实施例提供了一种投影显示方法、装置及投影设备，以至少解决相关技术中对投影进行梯形校正时分辨率损失较大且灰边效果明显的技术问题。
根据本申请实施例的一个方面，提供了一种投影显示方法，包括：确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，所述第一投影画面为所述投影仪投影时的初始投影画面，所述第二投影画面为所述投影仪校正后的投影画面；依据所述第一坐标及所述第二坐标确定第三投影画面的第三坐标，其中，所述第三投影画面由所述第一投影画面进行光学变焦缩放后得到；依据所述第一坐标及所述第三坐标确定目标变焦位置，并依据所述目标变焦位置控制所述投影仪进行光学变焦；依据所述第一坐标及所述第三坐标确定映射关系，并依据所述映射关系对所述第二坐标进行计算，得到第四坐标；将所述第四坐标对应的第四投影画面投射至投影平面进行显示。
可选地，确定所述第一投影画面的各个角点的坐标信息，得到所述第一坐标；确定所述第二投影画面的各个角点的坐标信息，得到所述第二坐标。
可选地，确定光学缩放参考点，所述光学缩放参考点为预先设定的用于对投影画面进行光学变焦处理的参考点；连接所述光学缩放参考点与所述第一投影画面的各个角点，得到多条线段，并确定所述多条线段中每条线段对应的第一距离；基于所述第二投影画面的各个角点绘制与所述第一投影画面的边界平行的直线，与所述多条线段相交于多个交点；对所述多个交点中的任一交点，确定所述交点至所述光学缩放参考点的第二距离，并计算所述第二距离和所述交点所在的线段对应的第一距离之间的比例；从得到的多个比例中确定最大比例，并依据所述最大比例与所述第一坐标，确定所述第三投影画面的第三坐标。
可选地，依据所述第一投影画面的各个角点的坐标信息以及所述最大比例，确定所述第三投影画面的各个角点的坐标信息，得到所述第三坐标。
可选地，确定变焦位置与缩放比例之间的第一关联关系，其中，所述缩放比例为：对任一变焦位置，以所述变焦位置进行投影时，得到的第五投影画面的第五角点至所述光学缩放参考点的第五距离和所述第五角点所在的线段对应的第一距离之间的比例。
可选地，确定所述第一坐标及所述第三坐标之间的比例关系，依据所述比例关系及所述第一关联关系确定所述目标变焦位置；确定变焦位置和变焦控制机构的控制参数之间的第二关联关系，依据所述第二关联关系及所述目标变焦位置调节所述变焦控制机构的控制参数，其中，所述变焦控制机构为所述投影仪中用于调节所述变焦位置的模块。
可选地，依据所述第一坐标和所述第三坐标确定将所述第三投影画面映射为所述第一投影画面时对应的单应性变换矩阵；依据所述单应性变换矩阵对所述第二坐标进行计算，得到所述第四坐标。
根据本申请实施例的另一方面，还提供了一种投影显示装置，包括：第一确定模块，用于确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，所述第一投影画面为所述投影仪投影时的初始投影画面，所述第二投影画面为所述投影仪校正后的投影画面；第二确定模块，用于依据所述第一坐标及所述第二坐标确定第三投影画面的第三坐标，其中，所述第三投影画面由所述第一投影画面进行光学变焦缩放后得到；变焦模块，用于依据所述第一坐标及所述第三坐标确定目标变焦位置，并依据所述目标变焦位置控制所述投影仪进行光学变焦；计算模块，用于依据所述第一坐标及所述第三坐标确定映射关系，并依据所述映射关系对所述第二坐标进行计算，得到第四坐标；显示模块，用于将所述第四坐标对应的第四投影画面投射至投影平面 进行显示。
根据本申请实施例的另一方面，还提供了一种投影设备，包括：处理器；存储器，与所述处理器连接，用于为所述处理器提供处理以下处理步骤的指令：确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，所述第一投影画面为所述投影仪投影时的初始投影画面，所述第二投影画面为所述投影仪校正后的投影画面；依据所述第一坐标及所述第二坐标确定第三投影画面的第三坐标，其中，所述第三投影画面由所述第一投影画面进行光学变焦缩放后得到；依据所述第一坐标及所述第三坐标确定目标变焦位置，并依据所述目标变焦位置控制所述投影仪进行光学变焦；依据所述第一坐标及所述第三坐标确定映射关系，并依据所述映射关系对所述第二坐标进行计算，得到第四坐标；将所述第四坐标对应的第四投影画面投射至投影平面进行显示；具有变焦控制机构的投影仪，用于接收所述处理器的指令，依据所述指令调节所述变焦控制机构的控制参数，并将投影画面投射至投影平面进行显示。
根据本申请实施例的另一方面，还提供了一种非易失性存储介质，所述非易失性存储介质包括存储的程序，其中，在所述程序运行时控制所述非易失性存储介质所在设备执行上述的投影显示方法。
在本申请实施例中，首先确定投影仪中投影时初始的第一投影画面，并通过算法拟合出校正后对应的第二投影画面，为尽量减小产生的灰边，确定将第一投影画面进行光学变焦缩放后能够覆盖第二投影画面的最小的第三投影画面，并确定目标变焦位置进行光学变焦，变焦过程不会产生分辨率损失；为使最终投影区域保持不变，计算第三投影画面和第一投影画面间的位置映射关系，依据该映射关系对第二投影画面的坐标进行调节，然后进行投影显示，该过程极大地降低了投影校正过程中的分辨率损失及产生的灰边效果。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是根据本申请实施例的一种投影显示方法的流程示意图；
图2是根据本申请实施例的一种投影仪中投影画面的示意图；
图3是根据本申请实施例的一种不同变焦位置对应投影画面的示意图；
图4是根据本申请实施例的一种确定第三投影画面的示意图；
图5是根据本申请实施例的一种变焦位置与缩放比例间的关系示意图；
图6是根据本申请实施例的一种投影仪中投影画面的示意图；
图7是根据本申请实施例的一种投影画面校正后的效果示意图；
图8是根据本申请实施例的一种投影显示装置的结构示意图；
图9是根据本申请实施例的一种投影设备的结构示意图。
具体实施方式
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分的实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本申请保护的范围。
需要说明的是，本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
为了更好地理解本申请实施例，对本申请实施例进行描述的过程中出现的部分名词或术语翻译解释如下：
梯形校正：在实际的投影使用过程中，为了保证在不同投射角度、不同投影距离的情况下，使用户观看到的最终投影画面呈现为矩形，需要对投影画面区域进行调整，该过程称为投影的梯形校正。通常，梯形校正过程中会存在分辨率损失以及灰边效果，校正比例越大，分辨率损失及灰边效果越明显。
光学变焦：光学变焦是依靠光学镜头结构来实现变焦，变焦镜头通过焦距的改变可以实现投影整体画面变大或者变小，此时投影画面中所有像素都是完整显示的，区别于梯形校正过程，光学变焦过程中没有分辨率损失。
实施例1
根据本申请实施例，提供了一种投影显示方法，需要说明的是，在附图的流程图 示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行，并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
图1是根据本申请实施例的一种投影显示方法的流程示意图，如图1所示，该方法包括如下步骤：
步骤S102，确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，第一投影画面为投影仪投影时的初始投影画面，第二投影画面为投影仪校正后的投影画面。
在本申请一些可选的实施例中，上述第一投影画面和第二投影画面的关系如图2所示，其中21表示第一投影画面，22表示第二投影画面。具体地，第一投影画面21整体呈矩形，但通常由于投影仪采用侧投方式等原因，直接将第一投影画面投射至投影平面后，显示的投影画面为非矩形；为了将投影平面中的非矩形投影画面调整为矩形，同时实现投影避障等效果，可以将投影仪中的第一投影画面21调节为第二投影画面22，需要说明的是，第二投影画面22是投影仪以算法拟合出来的完成梯形校正及投影避障的投影画面，用于后续的计算处理，并不会被投射至投影平面进行显示。
在分别确定第一投影画面和第二投影画面后，再确定第一投影画面的各个角点的坐标信息，得到第一坐标；确定第二投影画面的各个角点的坐标信息，得到第二坐标。具体地，由于投影画面通常为矩形，则第一坐标为第一投影画面的四个角点坐标，第二坐标为第二投影画面的四个角点坐标。
步骤S104，依据第一坐标及第二坐标确定第三投影画面的第三坐标，其中，第三投影画面由第一投影画面进行光学变焦缩放后得到。
为尽可能减小产生的灰边，可以先将投影画面进行光学变焦缩放，因此，需要先确定将第一投影画面进行光学变焦缩放后能够覆盖第二投影画面的最小投影画面，即第三投影画面。在本申请一些可选的实施例中，可以通过以下步骤确定第三投影画面及其对应的第三坐标。
步骤S1041，确定光学缩放参考点，光学缩放参考点为预先设定的用于对投影画面进行光学变焦处理的参考点。
图3示出了投影仪的光学变焦镜头在光学变焦过程中，对应的投影画面的移动轨迹，其中，31、32、33、34、35、36分别为不同的变焦位置所对应的投影画面，o则为光学缩放参考点，需要说明的是，图中的光学缩放中心o的位置仅为示意，其可以在画面中任意位置，甚至可以在画面外，实际位置根据具体的光学设计决定。
步骤S1042，连接光学缩放参考点与第一投影画面的各个角点，得到多条线段，并确定多条线段中每条线段对应的第一距离。
以图4为例，其中，41表示第一投影画面，其对应的四个角点为A、B、C、D，o为光学缩放参考点，分别连接oA、oB、oC、oD，并确定各自的第一距离。
步骤S1043，基于第二投影画面的各个角点绘制与第一投影画面的边界平行的直线，与多条线段相交于多个交点。
图4中的42表示第二投影画面，经过第二投影画面42的四个角点A1、B1、C1、D1分别绘制与第一投影画面的边界AB、BC、CD、DA平行的直线，分别与oA相交于点a、b、c、d，与oB相交于点e、f、g，与oD相交于点h、i，与oC相交于点j。
步骤S1044，对多个交点中的任一交点，确定交点至光学缩放参考点的第二距离，并计算第二距离和交点所在的线段对应的第一距离之间的比例。
确定图4中oa、ob、oc、od、oe、of、oj、oh、oi、oj的距离，并分别计算oa/oA，ob/oA，oc/oA，od/oA，oe/oB，of/oB，og/oB，oh/oD，oi/oD和oj/oC。
步骤S1045，从得到的多个比例中确定最大比例，并依据最大比例与第一坐标，确定第三投影画面的第三坐标。具体地，依据第一投影画面的各个角点的坐标信息以及最大比例，确定第三投影画面的各个角点的坐标信息，得到第三坐标。
例如，从上述多个比例中找出最大的比例oa/oA，并依据该比例和oA、oB、oC、oD，分别计算出第三投影画面的四个角点A2、B2、C2、D2的坐标信息，其中：oA2＝oA*(oa/oA)；oB2＝oB*(oa/oA)；oC2＝oC*(oa/oA)；oD2＝oD*(oa/oA)。
需要说明的是，在某些特殊情况下，可能存在第一投影画面四个角点至光学缩放参考点的缩放比例不一致的情况，则确定第三投影画面时需要通过每个角点所对应的最大比例进行计算。
步骤S106，依据第一坐标及第三坐标确定目标变焦位置，并依据目标变焦位置控制投影仪进行光学变焦。
在本申请一些可选的实施例中，在确定目标变焦位置前，需要先确定变焦位置与缩放比例之间的第一关联关系，其中，缩放比例为：对任一变焦位置，以该变焦位置进行投影时，得到的第五投影画面的第五角点至光学缩放参考点的第五距离和第五角点所在的线段对应的第一距离之间的比例。
以图3为例，上述缩放比例为：在某一变焦位置bn(n>1)下，该变焦位置对应的投影画面的角点Tn至光学缩放参考点的第五距离oTn与对应的oT1之间的比例。 可以看出，在光学变焦位置移动时，投影画面四点相对于光学缩放参考点的缩放比例是按同样的比例线性缩放的，因此，第一关联关系可以用如图5所示的线性关系r＝kb+c来表示，其中r代表缩放比例，且r＝OTn/OT1，k，c为曲线参数，b为当前变焦位置。
需要说明的是，如果投影画面的四个角点到光学缩放参考点的距离变化关系不一致，则需要分别拟合四条曲线来表征画面位置；同时，上述拟合曲线包括但不限于图5所示的线性关系。
在确定了变焦位置与缩放比例之间的第一关联关系后，可以确定第一坐标及第三坐标之间的比例关系，依据比例关系及第一关联关系确定目标变焦位置。例如，第一坐标及第三坐标之间的比例为r＝oa/oA，则目标变焦位置b＝(r-c)/k。
在依据目标变焦位置控制投影仪进行光学变焦时，可以先确定变焦位置和变焦控制机构的控制参数之间的第二关联关系，依据第二关联关系及目标变焦位置调节变焦控制机构的控制参数，其中，变焦控制机构为投影仪中用于调节变焦位置的模块。
具体地，可以确定变焦位置和变焦控制机构中步进电机的步进角，或是齿轮马达的马达步数等控制参数之间的第二关联关系，然后依据目标变焦位置b及第二关联关系调整变焦控制机构的具体控制参数，驱动变焦控制机构移动到对应的位置，则此时第一投影画面会缩放为第三投影画面。
步骤S108，依据第一坐标及第三坐标确定映射关系，并依据映射关系对第二坐标进行计算，得到第四坐标。
步骤S110，将第四坐标对应的第四投影画面投射至投影平面进行显示。
可以理解地，在进行光学变焦缩放后，假如仍以第二投影画面的坐标信息进行投影显示，则实际在投影平面中的投影区域会小于原先预期的投影区域，为了保证最终的投影区域保持不变，需要对第二投影画面的坐标信息进行调整。在本申请一些可选的实施例中，可以依据第一坐标和第三坐标确定将第三投影画面映射为第一投影画面时对应的单应性变换矩阵；然后依据单应性变换矩阵对第二坐标进行计算，得到第四坐标；再将第四坐标对应的第四投影画面投射至投影平面进行显示。
具体地，依据第三投影画面的四个角点坐标及第一投影画面的四个角点坐标，利用成熟的直接线性变换法DLT等方法，计算将第三投影画面映射为第一投影画面时对应的单应性变换矩阵H1，然后将第二投影画面的四个角点坐标按照变换矩阵H1进行单应性变换，得到第四投影画面的四个角点坐标，并依据该坐标将第四投影画面投射至投影平面进行显示。
以图6为例，其中，61为变焦前的第一投影画面，62为变焦前第二投影画面，经 过光学变焦缩放后，第一投影画面61被缩放为第三投影画面63，但此时第二投影画面62也会被缩放为64的投影画面，为了保证最终投影区域不变，需要对原第二投影画面62的角点坐标进行调整，使缩放后得到的第四投影画面与原第二投影画面62重合。
图7示出了应用本实施例的投影显示方法后的投影校正与相关技术中的投影校正的效果比较示意图，其中，左侧为相关技术中的投影校正，71为初始投影画面，72为校正后的投影画面，可以看出校正后产生了较大的分辨率损失及灰边效果；右侧为应用本实施的投影显示方法后的投影校正，73为初始投影画面，74为校正后的投影画面，可以看出校正后产生的分辨率损失及灰边效果明显减小。
在本申请实施例中，首先确定投影仪中以投影时初始的第一投影画面，并通过算法拟合出校正后对应的第二投影画面，为尽量减小产生的灰边，确定将第一投影画面进行光学变焦缩放后能够覆盖第二投影画面的最小的第三投影画面，并确定目标变焦位置进行光学变焦，变焦过程不会产生分辨率损失；为使最终投影区域保持不变，计算第三投影画面和第一投影画面间的位置映射关系，依据该映射关系对第二投影画面的坐标进行调节，然后进行投影显示，该过程极大地降低了投影校正过程中的分辨率损失及产生的灰边效果。
实施例2
根据本申请实施例，还提供了一种用于实现上述投影显示方法的投影显示装置，如图8所示，该装置包括第一确定模块80，第二确定模块82，变焦模块84，计算模块96和显示模块88，其中：
第一确定模块80，用于确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，第一投影画面为投影仪投影时的初始投影画面，第二投影画面为投影仪校正后的投影画面。
在本申请一些可选的实施例中，分别确定第一投影画面的各个角点的坐标信息，得到第一坐标；确定第二投影画面的各个角点的坐标信息，得到第二坐标。由于投影画面通常为矩形，则第一坐标为第一投影画面的四个角点坐标，第二坐标为第二投影画面的四个角点坐标。
第二确定模块82，用于依据第一坐标及第二坐标确定第三投影画面的第三坐标，其中，第三投影画面由第一投影画面进行光学变焦缩放后得到。
在本申请一些可选的实施例中，为尽可能减小产生的灰边，可以先将投影画面进行光学变焦缩放，因此，需要先确定将第一投影画面进行光学变焦缩放后能够覆盖第二投影画面的最小投影画面，即第三投影画面。
具体地，确定光学缩放参考点，光学缩放参考点为预先设定的用于对投影画面进行光学变焦处理的参考点；连接光学缩放参考点与第一投影画面的各个角点，得到多条线段，并确定多条线段中每条线段对应的第一距离；基于第二投影画面的各个角点绘制与第一投影画面的边界平行的直线，与多条线段相交于多个交点；对多个交点中的任一交点，确定交点至光学缩放参考点的第二距离，并计算第二距离和交点所在的线段对应的第一距离之间的比例；从得到的多个比例中确定最大比例，并依据最大比例与第一坐标，确定第三投影画面的第三坐标。
变焦模块84，用于依据第一坐标及第三坐标确定目标变焦位置，并依据目标变焦位置控制投影仪进行光学变焦。
在本申请一些可选的实施例中，在确定目标变焦位置前，需要先确定变焦位置与缩放比例之间的第一关联关系，其中，缩放比例为：对任一变焦位置，以该变焦位置进行投影时，得到的第五投影画面的第五角点至光学缩放参考点的第五距离和第五角点所在的线段对应的第一距离之间的比例。之后，可以确定第一坐标及第三坐标之间的比例关系，依据比例关系及第一关联关系确定目标变焦位置。
在依据目标变焦位置控制投影仪进行光学变焦时，可以先确定变焦位置和变焦控制机构的控制参数之间的第二关联关系，依据第二关联关系及目标变焦位置调节变焦控制机构的控制参数，其中，变焦控制机构为投影仪中用于调节变焦位置的模块。
计算模块86，用于依据第一坐标及第三坐标确定映射关系，并依据映射关系对第二坐标进行计算，得到第四坐标。
显示模块88，用于将第四坐标对应的第四投影画面投射至投影平面进行显示。
在本申请一些可选的实施例中，为了保证最终的投影区域保持不变，需要对第二投影画面的坐标信息进行调整。可以依据第一坐标和第三坐标确定将第三投影画面映射为第一投影画面时对应的单应性变换矩阵；然后依据单应性变换矩阵对第二坐标进行计算，得到第四坐标；再将第四坐标对应的第四投影画面投射至投影平面进行显示。
需要说明的是，本申请实施例中的投影显示装置中的各模块与实施例1中的投影显示方法实施步骤一一对应，由于实施例1中已经进行了详尽的描述，本实施例中部分未体现的细节可以参考实施例1，在此不再过多赘述。
实施例3
根据本申请实施例，还提供了一种投影设备，如图9所示，该投影设备90包括具有变焦控制机构的投影仪900，处理器902及存储器904，其中：
存储器904与处理器902连接，用于为处理器902提供处理以下处理步骤的指令： 确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，第一投影画面为投影仪投影时的初始投影画面，第二投影画面为投影仪校正后的投影画面；依据第一坐标及第二坐标确定第三投影画面的第三坐标，其中，第三投影画面由第一投影画面进行光学变焦缩放后得到；依据第一坐标及第三坐标确定目标变焦位置，并依据目标变焦位置控制投影仪进行光学变焦；依据第一坐标及第三坐标确定映射关系，并依据映射关系对第二坐标进行计算，得到第四坐标；将第四坐标对应的第四投影画面投射至投影平面进行显示。
具有变焦控制机构的投影仪900，用于接收处理器的指令，依据指令调节变焦控制机构的控制参数，并将投影画面投射至投影平面进行显示。
实施例4
根据本申请实施例，还提供了一种非易失性存储介质，该非易失性存储介质包括存储的程序，其中，在程序运行时控制非易失性存储介质所在设备执行上述的投影显示方法。
可选地，在程序运行时控制非易失性存储介质所在设备执行实现以下步骤：确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，第一投影画面为投影仪投影时的初始投影画面，第二投影画面为投影仪校正后的投影画面；依据第一坐标及第二坐标确定第三投影画面的第三坐标，其中，第三投影画面由第一投影画面进行光学变焦缩放后得到；依据第一坐标及第三坐标确定目标变焦位置，并依据目标变焦位置控制投影仪进行光学变焦；依据第一坐标及第三坐标确定映射关系，并依据映射关系对第二坐标进行计算，得到第四坐标；将第四坐标对应的第四投影画面投射至投影平面进行显示。
上述本申请实施例序号仅仅为了描述，不代表实施例的优劣。
在本申请的上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见其他实施例的相关描述。
在本申请所提供的几个实施例中，应该理解到，所揭露的技术内容，可通过其它的方式实现。其中，以上所描述的装置实施例仅仅是示意性的，例如单元的划分，可以为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，单元或模块的间接耦合或通信连接，可以是电性或其它的形式。
作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个 单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可为个人计算机、服务器或者网络设备等)执行本申请各个实施例方法的全部或部分步骤。而前述的存储介质包括：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
以上仅是本申请的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (10)

  1. 一种投影显示方法，其特征在于，包括：
    确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，所述第一投影画面为所述投影仪投影时的初始投影画面，所述第二投影画面为所述投影仪校正后的投影画面；
    依据所述第一坐标及所述第二坐标确定第三投影画面的第三坐标，其中，所述第三投影画面由所述第一投影画面进行光学变焦缩放后得到；
    依据所述第一坐标及所述第三坐标确定目标变焦位置，并依据所述目标变焦位置控制所述投影仪进行光学变焦；
    依据所述第一坐标及所述第三坐标确定映射关系，并依据所述映射关系对所述第二坐标进行计算，得到第四坐标；
    将所述第四坐标对应的第四投影画面投射至投影平面进行显示。
  2. 根据权利要求1所述的方法，其特征在于，确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，包括：
    确定所述第一投影画面的各个角点的坐标信息，得到所述第一坐标；
    确定所述第二投影画面的各个角点的坐标信息，得到所述第二坐标。
  3. 根据权利要求1所述的方法，其特征在于，依据所述第一坐标及所述第二坐标确定第三投影画面的第三坐标，包括：
    确定光学缩放参考点，所述光学缩放参考点为预先设定的用于对投影画面进行光学变焦处理的参考点；
    连接所述光学缩放参考点与所述第一投影画面的各个角点，得到多条线段，并确定所述多条线段中每条线段对应的第一距离；
    基于所述第二投影画面的各个角点绘制与所述第一投影画面的边界平行的直线，与所述多条线段相交于多个交点；
    对所述多个交点中的任一交点，确定所述交点至所述光学缩放参考点的第二距离，并计算所述第二距离和所述交点所在的线段对应的第一距离之间的比例；
    从得到的多个比例中确定最大比例，并依据所述最大比例与所述第一坐标，确定所述第三投影画面的第三坐标。
  4. 根据权利要求3所述的方法，其特征在于，依据所述最大比例与所述第一坐标， 确定所述第三投影画面的第三坐标，包括：
    依据所述第一投影画面的各个角点的坐标信息以及所述最大比例，确定所述第三投影画面的各个角点的坐标信息，得到所述第三坐标。
  5. 根据权利要求3所述的方法，其特征在于，在依据所述第一坐标及所述第三坐标确定目标变焦位置前，所述方法还包括：
    确定变焦位置与缩放比例之间的第一关联关系，其中，所述缩放比例为：对任一变焦位置，以所述变焦位置进行投影时，得到的第五投影画面的第五角点至所述光学缩放参考点的第五距离和所述第五角点所在的线段对应的第一距离之间的比例。
  6. 根据权利要求5所述的方法，其特征在于，依据所述第一坐标及所述第三坐标确定目标变焦位置，并依据所述目标变焦位置控制所述投影仪进行光学变焦，包括：
    确定所述第一坐标及所述第三坐标之间的比例关系，依据所述比例关系及所述第一关联关系确定所述目标变焦位置；
    确定变焦位置和变焦控制机构的控制参数之间的第二关联关系，依据所述第二关联关系及所述目标变焦位置调节所述变焦控制机构的控制参数，其中，所述变焦控制机构为所述投影仪中用于调节所述变焦位置的模块。
  7. 根据权利要求1所述的方法，其特征在于，依据所述第一坐标及所述第三坐标确定映射关系，并依据所述映射关系对所述第二坐标进行计算，得到第四坐标，包括：
    依据所述第一坐标和所述第三坐标确定将所述第三投影画面映射为所述第一投影画面时对应的单应性变换矩阵；
    依据所述单应性变换矩阵对所述第二坐标进行计算，得到所述第四坐标。
  8. 一种投影显示装置，其特征在于，包括：
    第一确定模块，用于确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，所述第一投影画面为所述投影仪投影时的初始投影画面，所述第二投影画面为所述投影仪校正后的投影画面；
    第二确定模块，用于依据所述第一坐标及所述第二坐标确定第三投影画面的第三坐标，其中，所述第三投影画面由所述第一投影画面进行光学变焦缩放后得到；
    变焦模块，用于依据所述第一坐标及所述第三坐标确定目标变焦位置，并依据所述目标变焦位置控制所述投影仪进行光学变焦；
    计算模块，用于依据所述第一坐标及所述第三坐标确定映射关系，并依据所述映射关系对所述第二坐标进行计算，得到第四坐标；
    显示模块，用于将所述第四坐标对应的第四投影画面投射至投影平面进行显示。
  9. 一种投影设备，其特征在于，包括：
    处理器；
    存储器，与所述处理器连接，用于为所述处理器提供处理以下处理步骤的指令：确定投影仪中的第一投影画面的第一坐标及第二投影画面的第二坐标，其中，所述第一投影画面为所述投影仪投影时的初始投影画面，所述第二投影画面为所述投影仪校正后的投影画面；依据所述第一坐标及所述第二坐标确定第三投影画面的第三坐标，其中，所述第三投影画面由所述第一投影画面进行光学变焦缩放后得到；依据所述第一坐标及所述第三坐标确定目标变焦位置，并依据所述目标变焦位置控制所述投影仪进行光学变焦；依据所述第一坐标及所述第三坐标确定映射关系，并依据所述映射关系对所述第二坐标进行计算，得到第四坐标；将所述第四坐标对应的第四投影画面投射至投影平面进行显示；
    具有变焦控制机构的投影仪，用于接收所述处理器的指令，依据所述指令调节所述变焦控制机构的控制参数，并将投影画面投射至投影平面进行显示。
  10. 一种非易失性存储介质，其特征在于，所述非易失性存储介质包括存储的程序，其中，在所述程序运行时控制所述非易失性存储介质所在设备执行权利要求1至7中任意一项所述的投影显示方法。
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