Projection method and apparatus for automatically adjusting display scale, and device and storage medium

Abstract

Disclosed in the present invention are a projection method and apparatus for automatically adjusting a display scale, and a device and a storage medium. The method comprises: first determining a first display area with a first display scale and a second display area with a second display scale in an area to be subjected to projection, wherein the first display scale is the display scale of target display content, and the second display scale is a preset display scale or the display scale of current display content; determining a target display scale on the basis of a display area, the width and / or length of which meet target requirements, in the first display area and the second display area; and projecting the target display content on the basis of the target display scale. By means of the present invention, a display scale can be intelligently switched on the basis of a projection environment and the original scale of a video source or a picture, thereby optimizing the presentation effect of display content.

Description

Projection method, device, equipment and storage medium for automatically adjusting display ratio Technical Field

[0001] The present invention relates to the technical field of projection adjustment, and in particular to a projection method, device, equipment and storage medium for automatically adjusting a display ratio. Background Art

[0002] When the current projection scene is projected sideways, it is generally displayed in 16:9 format, resulting in a large amount of blank areas. However, many video sources have ratios such as 21:9. The existing approach is to crop the 16:9 area to display it in 21:9 format, which cannot achieve the full projection effect. Due to the cropping, part of the image at the edge of the 16:9 area will also be lost. Summary of the Invention

[0003] In view of this, the present invention provides a projection method, device, equipment and storage medium for automatically adjusting the display ratio. After identifying the projection plane environment and angle, the default projection ratio of the machine is adjusted according to the original ratio of the video source or picture and the structure of the machine to optimize the presentation effect of the displayed content and obtain the best projection effect.

[0004] To solve the above technical problems, the present invention provides a projection method for automatically adjusting the display ratio, comprising:

[0005] Determine a first display area with a first display ratio and a second display area with a second display ratio in the area to be projected, wherein the first display ratio is the display ratio of the target display content, and the second display ratio is a preset display ratio or the display ratio of the current display content;

[0006] determining a target display ratio based on a display area in the first display area and the second display area whose width and / or length meet target requirements;

[0007] Project the target display content based on the target display ratio.

[0008] As an optional manner, determining a first display area with a first display ratio and a second display area with a second display ratio in the area to be projected includes:

[0009] Determine, according to the obstacle information and the projection angle information, a third display area of ​​the first display ratio and a fourth display area of ​​the second display ratio under the obstacle avoidance condition in the area to be projected;

[0010] Determine a fifth display area of ​​the first display ratio and a sixth display area of ​​the second display ratio under non-obstacle avoidance conditions in the area to be projected;

[0011] Determining a target display ratio based on a display area in the first display area and the second display area whose width and / or length meet target requirements includes:

[0012] In the case of receiving an obstacle avoidance selection instruction, the third display area is used as the first display area, and the fourth display area is used as the second display area; in the case of receiving a non-obstacle avoidance selection instruction, the fifth display area is used as the first display area, and the sixth display area is used as the second display area; or

[0013] The target display ratio is determined based on the display areas whose widths and / or lengths meet the target requirements among the third display area, the fourth display area, the fifth display area, and the sixth display area.

[0014] As an optional manner, determining the target display ratio based on the display area in the first display area and the second display area whose width and / or length meets the target requirement includes:

[0015] When a screen selection instruction is received, the screen ratio is used as the target display ratio.

[0016] As an optional method, projecting the target display content based on the target display ratio includes:

[0017] determining target position information based on the position information of the first display area and the position information of the second display area;

[0018] Rotate the optical machine to the target position based on the target position information so that the center of the first display area moves to the position where the center of the second display area is located;

[0019] The target display content is projected at the target position based on the target display ratio.

[0020] As an optional manner, determining the target position information based on the position information of the first display area and the position information of the second display area includes:

[0021] Acquire first position information of a first center of a first display area;

[0022] Acquire second position information of a second center of the second display area;

[0023] Target position information is determined based on the first position information and the second position information.

[0024] As an optional manner, determining the target location information based on the first location information and the second location information includes:

[0025] Based on the first position information and the second position information, a first connection line is constructed between the first center and the optical engine, and a second connection line is constructed between the second center and the optical engine;

[0026] The target rotation information is determined based on the included angles between the first connecting line and the second connecting line in the horizontal and vertical directions.

[0027] As an optional manner, after projecting the target display content at the target position based on the target display ratio, the method further includes:

[0028] Perform keystone correction on the projected image.

[0029] On the other hand, the present invention also provides a projection device capable of automatically adjusting a display ratio, comprising:

[0030] an image recognition module, configured to determine a first display area of ​​a first display ratio and a second display area of ​​a second display ratio within the area to be projected, wherein the first display ratio is the display ratio of the target display content, and the second display ratio is a preset display ratio or the display ratio of the current display content;

[0031] A judgment module, configured to determine a target display ratio based on a display area in the first display area and the second display area whose width and / or length meets the target requirement;

[0032] The projection module is provided with a lens and is used to project target display content based on a target display ratio.

[0033] On the other hand, the present invention further provides a projection device, including a processor and a memory, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the above-mentioned projection method for automatically adjusting the display ratio.

[0034] On the other hand, the present invention further provides a storage medium having a computer program stored thereon. When the computer program is executed, the above-mentioned projection method for automatically adjusting the display ratio is implemented.

[0035] The beneficial effects of the present invention are:

[0036] The present invention determines a target display ratio by selecting the display area in the first and second display areas whose width and / or length meet the target requirements, and then projects the target display content based on the target display ratio. The display ratio can be intelligently switched based on the projection environment and the original ratio of the video source or image, optimizing the presentation of the displayed content. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a schematic flow chart of a projection method for automatically adjusting a display ratio according to an embodiment of the present invention;

[0038] FIG2 is a schematic diagram of a first display area and a second display area provided by an embodiment of the present invention;

[0039] 3 is a schematic diagram of an optical path of an optical center according to a first display scale projection and a second display scale projection provided by an embodiment of the present invention;

[0040] FIG4 is a schematic diagram of a projection coordinate system constructed based on the current projection environment provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0042] Example

[0043] Referring to FIG. 1 to FIG. 4 , this embodiment provides a projection method for automatically adjusting a display ratio, including:

[0044] Determine a first display area with a first display ratio and a second display area with a second display ratio in the area to be projected, wherein the first display ratio is the display ratio of the target display content, and the second display ratio is a preset display ratio or the display ratio of the current display content;

[0045] determining a target display ratio based on a display area in the first display area and the second display area whose width and / or length meet target requirements;

[0046] Project the target display content based on the target display ratio.

[0047] The above-mentioned satisfaction of the target requirements can be understood as projecting a maximized display effect under normal circumstances. However, maximization is only one of the possible beneficial effects, that is, the beneficial effect when selecting a display ratio corresponding to a display area with a large width for display. In addition to selecting a large width, you can also select a large length. For example, when a mobile phone is projected, the mobile phone screen is vertical, then the display effect of a large length is better; or consider the width and length comprehensively; or when the area to be projected includes a screen, then you can select a display ratio corresponding to a display area whose width is more matched with the width of the screen, etc. Therefore, maximization is only one of the effects of meeting the target requirements. The specific length or width or other matching mode is not limited in this embodiment, and the best selection is based on the actual projection environment requirements.

[0048] Please refer to Figure 2 again, which is a schematic diagram of the first display area and the second display area in the area to be projected in an optional manner. In an embodiment of the present invention, assuming that the first display ratio is 21:9 and the second display ratio is a preset display ratio of 16:9, after the projector is started, the default display ratio of the projection picture projected on the area to be projected is 16:9, and the display ratio of many video sources may be 21:9 or other ratios. If it is only displayed at a display ratio of 16:9, it cannot provide the user with the best display effect. Therefore, the purpose of this embodiment is to enable the projection device to automatically identify the best display ratio and switch it by itself, without the need for manual attempts to modify it. The best display ratio described here can be the one that is selected by the projection area, or the one that matches the target size. This embodiment is not limited.

[0049] Optionally, before performing the above adjustment, this embodiment needs to determine a first display area with a first display ratio and a second display area with a second display ratio within the area to be projected, including:

[0050] Sensors, such as infrared cameras, RGB cameras, and rangefinders, are activated to analyze obstacle information and projection angles in the projection area. Furthermore, the presence of a projection screen can be analyzed. Based on the obstacle information and projection angle information, a third display area with a first display ratio and a fourth display area with a second display ratio are determined within the projection area under obstacle avoidance conditions. Furthermore, a fifth display area with a first display ratio and a sixth display area with a second display ratio are determined within the projection area under non-obstacle avoidance conditions.

[0051] The above-mentioned determination of the target display ratio based on the display areas whose width and / or length meet the target requirements in the first display area and the second display area includes: when an obstacle avoidance selection instruction is received, the third display area is used as the first display area, and the fourth display area is used as the second display area; when a non-obstacle avoidance selection instruction is received, the fifth display area is used as the first display area, and the sixth display area is used as the second display area; or, the target display ratio is determined based on the display areas whose width and / or length meet the target requirements in the third display area, the fourth display area, the fifth display area and the sixth display area.

[0052] In the above obstacle avoidance selection process, it should be noted that in this embodiment, only the display area selection under non-obstacle avoidance conditions can be performed. In this case, the fifth display area is the first display area, and the sixth display area is the second display area; or only the display area selection under obstacle avoidance conditions can be performed. In this case, the third display area is the first display area, and the fourth display area is the second display area; or the display area selection under obstacle avoidance conditions and non-obstacle avoidance conditions can be performed at the same time, and then the display area that meets the requirements is determined according to the needs.

[0053] And, based on the display area in the first display area and the second display area whose width and / or length meets the target requirements, the target display ratio is determined, including: when a screen selection instruction is received, the screen ratio is used as the target display ratio. If screen alignment is performed, it is equivalent to using the screen ratio as the target display ratio, and no longer considering the actual projection area (plane, wall, etc.). Therefore, when the user selects the screen condition, the screen alignment function is performed directly. When the user selects the obstacle avoidance condition, the size information of the display area under obstacle avoidance is selected. When the user selects the non-obstacle avoidance condition, the size information of the non-obstacle avoidance display area is selected for alignment. In an implementable scenario, when the projected display screen is rectangular, the size information of the above-mentioned display area may include length information and width information.

[0054] The above steps are used to determine the target display area. After confirming the display area, please refer to Figures 2 and 3 again. The centers of the display areas of different display ratios are not aligned, so the projected images will be misaligned. To provide a better performance and user experience for this embodiment, the optical engine can be controlled to rotate horizontally and vertically to maintain the same center position for different display ratios, thus improving the user experience.

[0055] In this embodiment, projecting the target display content based on the target display ratio includes:

[0056] determining target position information based on the position information of the first display area and the position information of the second display area;

[0057] Rotate the optical machine to the target position based on the target position information so that the center of the first display area moves to the position where the center of the second display area is located;

[0058] The target display content is projected at the target position based on the target display ratio.

[0059] The target position information can be determined by calculating the center point position information of the two display areas, or by calculating the four corner point position information of the two display areas, or by other calculation methods. The target position information can be the horizontal and / or vertical angles that the optical machine needs to rotate, or the coordinate information of the target position (optionally, the position of the center of the second display area).

[0060] As an optional manner, determining the target position information based on the position information of the first display area and the position information of the second display area includes:

[0061] Acquire first position information of a first center of a first display area;

[0062] Acquire second position information of a second center of the second display area;

[0063] Target position information is determined based on the first position information and the second position information.

[0064] In this embodiment, the first position information and the second position information may include the coordinates of the first center and the second center after the coordinate system is constructed based on the current projection environment. Therefore, the distance and tilt angle between the two center points can be calculated based on the coordinates of the first center and the second center, and then converted into the angle that the optical machine needs to rotate to determine the target position information. Optionally, when the optical machine is located at the target projection position, a projection coordinate system based on the projection environment is constructed, and then the first position information of the first center of the first display area and the second position information of the second center of the second display area in the projection coordinate system are obtained through a ranging module installed at the optical machine position.

[0065] Therefore, determining the target location information includes the following processes:

[0066] Based on the first position information and the second position information, a first connection line is constructed between the first center and the optical engine, and a second connection line is constructed between the second center and the optical engine;

[0067] The target rotation information is determined based on the included angles between the first connecting line and the second connecting line in the horizontal and vertical directions.

[0068] Please refer again to Figure 4. Figure 4 illustrates a projection coordinate system established in a projection scenario, treating the optical engine as a point mass. This coordinate system includes the first center of the first display area, the second center of the second display area, and the optical engine. While it does not fully correspond to the actual projection environment, it serves as an example of the aforementioned connection method. Figure C represents the location of the optical engine, and rays CA and CB represent the first and / or second connection lines, respectively.

[0069] Through the above scheme, the target rotation information determined based on the angle between the first line and the second line in the horizontal and vertical directions is the offset of the first line transferred to coincide with the second line, which can be calculated respectively by the angle between the first line and the second line in the horizontal direction and the vertical direction.

[0070] In one implementation, for example, the second display ratio is 16:9, the first display ratio is 21:9, and the center positions corresponding to the second display area and the first display area are (x0, y0) and (x1, y1). The distance information z0 and z1 corresponding to the two center positions can be directly obtained according to the ranging module, that is, the three-dimensional coordinates (x0, y0, z0) (x1, y1, z1) corresponding to the optical machine. It is necessary to move the center position of the first display area to the position of the center of the second display area, that is, to move point B in Figure 2 to the position of point A, and then calculate the angles between the two rays (x1, y1, z1) and (x0, y0, z0) in the horizontal and vertical directions, that is, the angle between (x1, y0, z1) and (x0, y0, z0) is the horizontal angle, and the angle between (x0, y1, z1) and (x0, y0, z0) is the vertical angle. After obtaining the angle data, it is transmitted to the optical engine drive module, which rotates the machine to the corresponding angle. After it is in place, the target display content is projected based on the target display ratio. Specifically, after it is in place, the display area of ​​the target display ratio can be obtained.

[0071] Through the above solution, this embodiment is implemented as follows in one implementation scenario:

[0072] During projection preparation, the projection area is checked for obstacles. If there are any, the system uses obstacle avoidance to locate a maximum 16:9 and 21:9 display area (x, y, w, h), (X, Y, W, H) in the projection area. x, y represent the coordinates of the upper left corner, and w, h represent the length and width of the display area. Similarly, assuming no obstacles are present, a maximum 16:9 and 21:9 display area (x, y, w, h), (X, Y, W, H) can be located in the projection area. The W, W relationship is then compared. Refer to Figure 2 again. Based on actual requirements, assuming the 21:9 display width is wider than 16:9, meeting the requirements for switching to 21:9, the 21:9 aspect ratio is enabled for projection, completing the image display calibration.

[0073] In this way, this embodiment intelligently switches the display ratio according to the projection environment and the proportion of the projected content to maximize the display image, and can ensure that the center of the image is aligned when switching between images of different proportions, without affecting the user's viewing experience.

[0074] In addition, after projecting the target display content at the target position based on the target display ratio, this embodiment can also perform trapezoidal correction and obstacle avoidance operations on the screen based on production conditions and usage environment. As an optional method, the trapezoidal correction is to obtain the transmission image of the projector, grayscale process and downsample the transmission image respectively, and calculate the gradient value and gradient direction of each pixel point. After sorting the gradient values ​​of all pixel points, find the gradient values ​​that are similar within the preset gradient direction, thereby determining multiple strip areas with widths, with the center line of the strip area representing the position of the strip area, and establishing multiple detection lines. The lengths of the multiple detection lines are compared to determine the edge line; determine the coordinates of the intersection of the edge lines, determine the magnitude of the horizontal and vertical distortion of the image based on the coordinates of the intersection, and determine the angle amplitude to be adjusted to correct the projected image into a rectangular image based on the coordinates of the intersection, and send it to the processing chip of the projector for adjustment.

[0075] The obstacle avoidance operation may include sensory obstacle avoidance and non-sensory obstacle avoidance. In this embodiment, a non-sensory obstacle avoidance method is preferably used. First, environmental information is collected by an image sensor at the target projection position to obtain three-dimensional spatial data to extract depth obstacle feature points; an infrared segmentation map of the projection plane is constructed to extract infrared obstacle feature points; then, the depth obstacle feature points and infrared obstacle feature points are filtered. The filtering process includes three steps, namely:

[0076] Mark the feature points that are both depth obstacle feature points and infrared obstacle feature points, and regard all marked feature points as target obstacle points;

[0077] Performing area filtering on the unmarked depth obstacle feature points, eliminating points whose area is less than or equal to the first preset area according to the filtering results, and treating the remaining points as target obstacle points;

[0078] Perform area filtering on the unmarked infrared obstacle feature points, eliminate points with an area less than or equal to a second preset area based on the filtering results, establish a region of interest around the remaining infrared obstacle feature points, compare the average infrared intensity of the region of interest with the average pixel intensity of the projection plane, and mark the infrared obstacle feature points that meet the preset conditions as target obstacle points based on the comparison results to obtain the obstacle recognition results.

[0079] Afterwards, an obstacle feature map in the image sensor coordinate system is obtained based on the obstacle recognition results;

[0080] Mapping the obstacle feature map to a projection coordinate system based on a homography mapping relationship between the infrared segmentation map and the projection image to obtain an obstacle avoidance mask in the projection coordinate system;

[0081] Based on the obstacle avoidance mask result, the final lower point value of the projection is found according to the preset projection scale for projection.

[0082] On the other hand, this embodiment further provides a projection device capable of automatically adjusting a display ratio, comprising:

[0083] an image recognition module, configured to determine a first display area of ​​a first display ratio and a second display area of ​​a second display ratio within the area to be projected, wherein the first display ratio is the display ratio of the target display content, and the second display ratio is a preset display ratio or the display ratio of the current display content;

[0084] A judgment module, configured to determine a target display ratio based on a display area in the first display area and the second display area whose width and / or length meets a target requirement;

[0085] The projection module is provided with a lens and is used to project target display content based on a target display ratio.

[0086] On the other hand, this embodiment further provides a projection device, including a processor and a memory, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the above-mentioned projection method for automatically adjusting the display ratio.

[0087] On the other hand, this embodiment further provides a storage medium having a computer program stored thereon. When the computer program is executed, the above-mentioned projection method for automatically adjusting the display ratio is implemented.

[0088] Example 2

[0089] This embodiment aims to provide a projection method scenario for automatically adjusting the display ratio based on the above-mentioned embodiment 1, which includes:

[0090] The user opens the content to be displayed (for example, the content to be displayed is a video, so the content to be displayed includes information such as picture, size, and ratio), and the projection device obtains the display ratio of the display content, for example, the display ratio obtained is 21:9. After obtaining the display ratio parameters, start calling sensors, such as infrared cameras, RGB cameras, ranging sensors, etc., to analyze the obstacle information and projection angle of the projection wall, and whether there is a projectable screen. According to the obstacle information and the projection angle, the optimal 16:9 and 21:9 display areas under the current projection environment are calculated respectively (this ratio is selected to illustrate this embodiment, and it can also be other ratios such as 4:3, which is not limited in this embodiment), and obtain the width information of the two display ratios under obstacle avoidance conditions and non-obstacle avoidance conditions (it can also be length, aspect ratio, etc., which is not limited in this embodiment).

[0091] When the user selects the screen condition, the screen alignment function is directly performed. When the user selects the obstacle avoidance condition, the obstacle avoidance width information is selected. When the user selects the non-obstacle avoidance condition, the non-obstacle avoidance width information is selected. In one optional projection environment, as shown in Figure 2, the width information of 21:9 and 16:9 is compared. If the width of 21:9 is greater than that of 16:9, the system intelligently determines that the image displayed in 21:9 is larger than 16:9 in the current environment, and the display ratio is directly switched to 21:9.

[0092] In addition, this embodiment also provides a method for adjusting the projection center, including:

[0093] Calculate the center position of the screen with 16:9 and 21:9 display ratios. Calculate the angle between the horizontal and vertical positions based on the line connecting the center position and the optical engine. Then, the optical engine can be controlled to rotate in the horizontal and vertical directions to achieve the same center position of the screen at different ratios, thereby improving the experience. For example, the center positions corresponding to 16:9 and 21:9 are (x0, y0) and (x1, y1). The distance information z0 and z1 corresponding to these two center positions can also be directly obtained according to the ranging module, which is the three-dimensional coordinates (x0, y0, z0) (x1, y1, z1) corresponding to the optical machine. We need to move the center position of 21:9 to be consistent with 16:9, so we need to calculate the angles between the two rays (x1, y1, z1) and (x0, y0, z0) in the horizontal and vertical directions, that is, the angle between (x1, y0, z1) and (x0, y0, z0) is the horizontal angle, and the angle between (x0, y1, z1) and (x0, y0, z0) is the vertical angle.

[0094] The obtained angle data is then transmitted to the driver module, which rotates the machine to the corresponding angle. Once in position, the display area with a 21:9 display ratio is obtained to calibrate the image. Therefore, this embodiment can intelligently switch the display ratio based on the projection environment and the original ratio of the video source or image, optimizing the presentation of the displayed content. It can also ensure that the center of the image is aligned when switching between different ratios, providing users with an optimal viewing experience.

[0095] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention should be determined by the scope defined in the claims. Persons skilled in the art will appreciate that improvements and modifications may be made without departing from the spirit and scope of the present invention, and such improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A projection method for automatically adjusting the display ratio, characterized in that Including: Determine a first display area with a first display ratio and a second display area with a second display ratio within the area to be projected, where the first display ratio is the display ratio of the target display content, and the second display ratio is a preset display ratio or the display ratio of the current display content; Determine the target display ratio based on the display areas in the first display area and the second display area whose width and / or length meet the target requirements; Project the target display content based on the target display ratio.

2. The projection method for automatically adjusting the display ratio according to claim 1, characterized in that The determining the first display area with the first display ratio and the second display area with the second display ratio within the area to be projected includes: According to the obstacle information and the projection angle information, determine a third display area with the first display ratio and a fourth display area with the second display ratio under the obstacle avoidance condition within the area to be projected; Determine a fifth display area with the first display ratio and a sixth display area with the second display ratio under the non-obstacle avoidance condition within the area to be projected; The determining the target display ratio based on the display areas in the first display area and the second display area whose width and / or length meet the target requirements includes: When receiving an obstacle avoidance selection instruction, use the third display area as the first display area and the fourth display area as the second display area; when receiving a non-obstacle avoidance selection instruction, use the fifth display area as the first display area and the sixth display area as the second display area; or, Determine the target display ratio based on the display areas in the third display area, the fourth display area, the fifth display area, and the sixth display area whose width and / or length meet the target requirements.

3. An automatic display ratio adjustment projection method according to claim 1, characterized in that, The determining the target display ratio based on the display areas in the first display area and the second display area whose width and / or length meet the target requirements includes: When receiving a screen selection instruction, use the screen ratio as the target display ratio.

4. An automatic display ratio adjustment projection method according to claim 1, characterized in that, The projecting the target display content based on the target display ratio includes: Determine the target position information based on the position information of the first display area and the position information of the second display area; Rotate the optical engine to the target position based on the target position information, so that the center of the first display area moves to the position where the center of the second display area is located; Project the target display content based on the target display ratio at the target position.

5. An automatic display ratio adjustment projection method according to claim 4, characterized in that, The determining the target position information based on the position information of the first display area and the position information of the second display area includes: Obtain the first position information of the first center of the first display area; Obtain the second position information of the second center of the second display area; Determine the target position information based on the first position information and the second position information.

6. The projection method for automatically adjusting the display ratio according to claim 5, wherein, The determining the target position information based on the first position information and the second position information includes: Based on the first position information and the second position information, construct a first connection line between the first center and the optical engine, and construct a second connection line between the second center and the optical engine; Determine the target rotation information based on the angles of the first connection line and the second connection line in the horizontal and vertical directions.

7. An automatic display ratio adjustment projection method according to claim 1, characterized in that After projecting the target display content based on the target display ratio at the target position, further include: Perform trapezoidal correction operation on the projection screen.

8. A projection device for automatically adjusting the display ratio, characterized in that, Including: An image recognition module for determining a first display area with a first display ratio and a second display area with a second display ratio within the area to be projected, where the first display ratio is the display ratio of the target display content, and the second display ratio is a preset display ratio or the display ratio of the current display content; A judgment module for determining the target display ratio based on the display area whose width and / or length in the first display area and the second display area meet the target requirements; A projection module provided with a lens for projecting the target display content based on the target display ratio.

9. A projection device, characterized in that, Including a processor and a memory, with a computer program stored on the memory, and the processor is used to execute the computer program to implement the projection method for automatically adjusting the display ratio according to any one of claims 1 to 7.

10. A storage medium, on which a computer program is stored, characterized in that, When the computer program is executed, it implements the projection method for automatically adjusting the display ratio according to any one of claims 1 to 7.

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