WO2020220831A1

WO2020220831A1 - Method and apparatus for realizing superposition of projected pictures, and projection system

Info

Publication number: WO2020220831A1
Application number: PCT/CN2020/078366
Authority: WO
Inventors: 钟波; 肖适; 王鑫; 张立造
Original assignee: 成都极米科技股份有限公司
Priority date: 2019-04-30
Filing date: 2020-03-09
Publication date: 2020-11-05
Also published as: CN111314679B; CN111314679A

Abstract

The present invention relates to the technical field of projection superposition, and specifically disclosed are a method and apparatus for realizing superposition of projected pictures, and a projection system. According to the present application, a superposed feature image is projected to a projection plane by means of a first projection apparatus, and a small-scale superposed feature image is projected to the projection plane by means of a second projection apparatus, thus avoiding overlap of angular points of projected images; and a projection plane image is photographed by means of an image collection apparatus, an actual projection area of the second projection apparatus is calculated, and then the actual projection area of the second projection apparatus is transformed to a superposed feature image region, such that precise superposition of pixels of projected pictures of two or more projection apparatuses can be realized, thus reducing the difficulty in superposing the projected pictures, and costs being low.

Description

Method, device and projection system for realizing projection screen superposition

Technical field

The invention relates to the technical field of projection superimposition, and specifically discloses a method, a device and a projection system for realizing projection image superposition.

Background technique

In some projection scenes, in order to improve the display brightness of the projection screen and achieve a three-dimensional display effect, multiple projection screens need to be superimposed to achieve a better display effect. Therefore, how to conveniently and quickly superimpose projection images of multiple projection devices is a problem that needs to be solved urgently.

Summary of the invention

In view of this, the present application provides a method, device, and projection system for realizing projection image superposition. Two projection devices respectively project a superimposition feature map and a small-scale superposition feature map to the projection surface, and the camera captures the projection surface image to obtain the superimposition feature. The image area and the small-scale superimposed characteristic image area are transformed, and the small-scale superimposed characteristic image area is transformed into the superimposed characteristic image area to quickly realize the superimposition of the projection images of the two projection devices.

In order to solve the above technical problems, the technical solution provided by the present invention is a method for realizing projection screen superposition, which is applied to a projection system. The projection system includes an image acquisition device, a first projection device, and a second projection device. The superimposed feature map preset by the projection device and the small-scale superimposed feature map preset by the second projection device have a pixel difference, and the method includes:

S11: Send a superimposed image projection command to the first projection device and the second projection device, so that the first projection device projects the preset superimposed feature map to the projection surface, and the second projection device projects the preset superimposed feature map to the projection surface. A small-scale superimposed feature image, where the superimposed feature image and the small-scale superimposed feature image on the projection surface have an overlapping area, and the overlapping area does not block the four corner points of the superimposed feature image;

S12: Send a superimposed image acquisition command to the image acquisition device, so that the image acquisition device acquires a projection surface image, where the projection surface image is an overall image including a small-scale superimposed feature image and superimposed feature image on the projection surface;

S13: Calculate the superimposition adjustment parameter of the second projection device according to the projection surface image;

S14: Send the overlay adjustment parameter of the second projection device to the second projection device, so that the second projection device adjusts the projected image according to the overlay adjustment parameter.

Preferably, the method of step S13 includes:

S131: Identify the superimposed characteristic image area in the projection surface image, obtain the desired projection area of the second projection device in the projection surface image, identify the small-scale superimposed characteristic image area in the projection surface image, and obtain the second A small-scale projection area of the projection device in the projection surface image;

S132: Obtain the feature pattern reduction ratio of the small-scale superimposed feature map of the second projection device, and the feature pattern reduction ratio of the small-scale superimposed feature map of the second projection device, the feature pattern reduction ratio of the small-scale superimposed feature map, and the ratio in the projection surface image A small-scale projection area, calculating the actual projection area of the second projection device in the projection surface image;

S133: Calculate the overlay adjustment parameter of the second projection device according to the actual projection area of the second projection device in the projection surface image and the expected projection area of the second projection device in the projection surface image.

Preferably, before the step S11, the method further includes the step: S10: establishing communication with the first projection device and the second projection device.

Preferably, the method of step S10 includes:

S1011: Send a recognition image projection command to the first projection device and the second projection device, so that the first projection device and the second projection device respectively project their small-scale recognition feature maps on the projection surface, and the Two small-scale recognition feature images do not overlap, and the small-scale recognition feature image includes the identification mark of the projection device;

S1012: Send a recognition image capture command to the image capture device, so that the image capture device captures a projection surface image, where the projection surface image is an overall image including two small-scale recognition feature images on the projection surface;

S1013: Identify the identification marks in the two small-scale identification feature images in the projection surface image, and obtain the number information of the two projection devices;

S1014: Establish communication with the first projection device and the second projection device respectively according to the number information of the two projection devices.

Preferably, the method of step S10 includes:

S1021: Send a broadcast to all projection devices;

S1022: Receive the number information returned by the two projection devices;

S1023: Establish communication with the first projection device and the second projection device respectively according to the number information of the two projection devices.

The present invention also provides a device for superimposing projection images, which is applied to a projection system. The projection system includes an image acquisition device, a first projection device, and a second projection device. The superimposition feature map preset by the first projection device is The small-scale superimposed feature map preset by the second projection device has a pixel difference, and the device includes:

The superimposed image projection module is used to send superimposed image projection commands to the first projection device and the second projection device, so that the first projection device projects the preset superimposed feature map to the projection surface, and the second projection device projects the Projecting a preset small-scale superimposed feature map on a surface, where the superimposed feature image and the small-scale superimposed feature image on the projection surface have overlapping areas, and the overlapping area does not block the four corner points of the superimposed feature image;

The superimposed image acquisition module is used to send a superimposed image acquisition command to the image acquisition device, so that the image acquisition device collects a projection surface image, and the projection surface image is a whole including a small-scale superimposed feature image on the projection surface and a superimposed feature image image;

A superposition parameter calculation module, configured to calculate superposition adjustment parameters of the second projection device according to the projection surface image;

The superimposition parameter sending module is configured to send the superimposition adjustment parameter of the second projection device to the second projection device, so that the second projection device adjusts the projected image according to the superimposition adjustment parameter.

Preferably, the superposition parameter calculation module includes:

The image recognition unit is used to recognize the superimposed characteristic image area in the projection surface image, obtain the desired projection area of the second projection device in the projection surface image, and is also used to recognize the small-scale superposition in the projection surface image A characteristic image area to obtain a small-scale projection area of the second projection device in the projection surface image;

The area calculation unit is used to obtain the feature pattern reduction ratio of the small-scale superimposed feature map of the second projection device, and according to the small-scale superimposed feature map of the second projection device, the feature pattern reduction ratio of the small-scale superimposed feature map and the projection A small-scale projection area in the surface image, calculating the actual projection area of the second projection device in the projection surface image;

The parameter calculation unit is configured to calculate the superimposition adjustment parameter of the second projection device according to the actual projection area of the second projection device in the projection surface image and the expected projection area of the second projection device in the projection surface image.

Preferably, it further includes a communication establishment module for establishing communication with the first projection device and the second projection device.

Preferably, the communication establishment module includes:

The recognition image projection unit is used to send recognition image projection commands to the first projection device and the second projection device, so that the first projection device and the second projection device respectively project their small-scale recognition feature maps to the projection surface, so The two small-scale recognition feature images on the projection surface do not overlap, and the small-scale recognition feature image includes the identification mark of the projection device;

The recognition image acquisition unit is configured to send a recognition image acquisition command to the image acquisition device, so that the image acquisition device acquires a projection surface image, and the projection surface image is an overall image containing two small-scale recognition characteristic images on the projection surface;

A serial number information acquisition unit, used to identify the identification marks in the two small-scale identification feature images in the projection surface image, and acquire serial number information of the two projection devices;

Number communication establishment unit: respectively establish communication with the first projection device and the second projection device according to the number information of the two projection devices.

Preferably, the communication establishment module includes:

Broadcast sending unit for sending broadcast to all projection devices;

The information receiving unit is used to receive the number information returned by the two projection devices;

The communication establishment unit is used to establish communication with the first projection device and the second projection device respectively according to the number information of the two projection devices.

The present invention also provides a device for realizing projection screen superimposition, including a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor realizes the foregoing when the computer program is executed. The method of realizing the projection screen superimposition.

The present invention also provides a projection system, which includes an image acquisition device and at least two projection devices, and also includes the above-mentioned device for superimposing projection images.

Compared with the prior art, the beneficial effects of the present application are described in detail as follows: the present application uses the first projection device to project the superimposed feature map on the projection surface, and the second projection device projects the small-scale superimposed feature map on the projection surface, thereby avoiding the projection image The corner points are overlapped, the projection surface image is captured by the image acquisition device, the actual projection area of the second projection device is calculated, and then the actual projection area of the second projection device is transformed into the superimposed characteristic image area, which can realize two or more projection devices. The precise superposition of the projection screen pixels reduces the difficulty and low cost of the projection screen superposition.

Description of the drawings

FIG. 1 is a schematic flowchart of a method for superimposing projection images provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of an architecture for realizing superimposition of projection images provided by an embodiment of the present invention;

FIG. 3 is a schematic flowchart of another method for superimposing projection images according to an embodiment of the present invention;

4 is a schematic diagram of the structure of the identifying projection device provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a device for realizing superimposition of projection images provided by an embodiment of the present invention;

Fig. 6 is an architectural diagram of a projection system provided by an embodiment of the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in FIG. 1, the embodiment of the present invention provides a method for realizing projection image superposition, which is applied to a projection system. The projection system includes an image acquisition device, a first projection device, and a second projection device. The first projection device is preset There is a pixel difference between the superimposed feature map and the small-scale superimposed feature map preset by the second projection device. The specific method includes:

It should be noted that both projection devices are provided with superimposed feature maps and small-scale superimposed feature maps. The superimposed feature maps of the first projection device and the small-scale superimposed feature maps of the second projection device have a pixel difference. The small-scale superimposed feature map has a pixel difference with the superimposed feature map of the second projection device. The purpose of setting the pixel difference is to obtain the area of the projection surface image where the feature image is superimposed and the area of the small-scale superimposed feature image in the projection surface image. For example, the superimposed feature map can be a transparent framed map, and the small-scale superimposed feature map can be a black framed map. The first projection device is controlled to project the superimposed feature map. By identifying the frame of the superimposed feature map, the reference projection image can be determined As long as the projection area of the second projection device is changed to the position of the reference projection screen, the superposition of the projection screen is completed.

Each projection device is provided with its own overlay feature map and scale overlay feature map. When the projection device projects the overlay feature map to the projection surface, the actual projection area of the projection device can be seen, but each projection device projects the overlay feature to the projection surface The map will cause the images on the projection surface to overlap, and it is very easy to block the four corners of the superimposed feature image, which brings great difficulty to image processing and calculation when implementing image superposition, so the superimposed feature map is based on certain features The pattern reduction ratio (1>reduction ratio>0) is reduced and re-projected to avoid overlapping of the images of multiple projection devices, and also avoids the overlap of the superimposed feature maps projected by the first projection device and the superimposed feature maps projected by the second projection device. interference. The feature pattern reduction ratio can be set according to the actual needs of customers. The feature pattern in the overlay feature map is reduced by the feature pattern reduction ratio under the original pixel ratio to obtain a small-scale overlay feature map. The essence of the small-scale overlay feature map is to superimpose features. The feature pattern of the map is reduced and placed in the upper part of the small-scale superimposed feature map, and the surrounding is a transparent image. The small-scale superimposed feature map and the superimposed feature map have the same image content, but the size of the image area is different.

It should be noted that, in step S11, after the first projection device projects the superimposed feature map on the projection surface, since the superimposed feature map on the projection surface is the reference projection area for finally displaying the projection image, we can also project the superimposed feature After the picture, perform operations such as keystone correction on the projection screen to make the projection screen rectangular or have a better effect.

It should be noted that in step S11, when the second projection device projects the small-scale superimposed feature image on the projection surface, the small-scale superimposed feature image on the projection surface cannot block the four corner points of the superimposed feature image, that is, the small-scale superimposed feature image The superimposed feature image can be inside the frame of the superimposed feature image, or outside the frame of the superimposed feature image, or overlap with the superimposed feature image, but it must not cover the four corners of the superimposed feature image, otherwise it will affect the result of image recognition .

It should be noted that, in step S12, the image acquisition device refers to a device with an image shooting function, which may be a camera, a smart phone, a tablet computer, a notebook computer, and the like. The shooting position of the image acquisition device is not limited. It is only required that all small-scale superimposed feature images and superimposed feature images on the projection surface can be taken as a whole for subsequent calculations. Of course, the definition also needs to meet the requirements of conventional pixels.

Specifically, the method of step S13 includes:

It should be noted that the feature pattern reduction ratio of the small-scale superimposed feature map of the second projection device can be stored in the second projection device, can also be stored in a device that realizes projection screen overlap, or can be stored on a server.

As shown in FIG. 2, the embodiment of the present invention provides a schematic diagram of an architecture for realizing projection screen overlap. The projection system includes projection devices C1 and C2. The projection device C1 is the first projection device, and the projection device C2 is the second projection device. It is necessary to locate the position of the projection area of the two projection devices. The projection device C1 projects the superimposed feature map, that is, directly projects the transparent image with a frame in the middle, and the projection device C2 projects a small-scale superimposed feature map. The projection device C1 only displays the frame and the center part is printed. Black background (the black background of the projection device means that the brightness is very low or 0), C2 projects a small-scale superimposed feature map with pixel difference in the central part of C1 to locate the projection area. Since the images projected by C1 and C2 are known, the mutual inclusion relationship between the images found according to the image recognition can be matched and corresponding to the projection image area and the projection device.

The next step is to calculate the actual projection area of the projection device C2. The specific calculation methods include: Since the small-scale superimposed feature map and the superimposed feature map of C2 are known, the pixel coordinates of the small-scale superimposed feature map in the superimposed feature map are Known. According to the small-scale superposition of the four corner pixel coordinates of the feature map and the four corner pixel coordinates of the superimposed feature map, that is, according to the corresponding relationship of the eight corner points, use the direct linear transformation method (Direct Linear Transform) or the least square method to calculate The homography transformation matrix H2, that is, H2 represents the coordinate transformation relationship from the small-scale superimposed feature map of C2 to the superimposed feature map. According to the projection surface image of the small-scale superimposed feature map projected by C2 taken by the image acquisition device, on the projection surface Find the C2 small-scale superimposed feature image area EFGH in the image. The specific search method here can be corner search or image template matching. There are no specific requirements and no restrictions here. Use homography matrix correspondence

Among them, (u1, v1), (u2, v2) are the pixel coordinates of the corresponding points of the superimposed feature map and the small-scale superimposed feature map, respectively, and S is a constant scale factor. Therefore, the positions of the four corner points of the superimposed feature image can be calculated from the positions of the four corner points of the C2 small-scale superimposed feature image on the projection surface, that is, the efgh can be obtained by EFGH according to the H1 transformation, so as to find the complete projection area/actual projection of C2 area.

After obtaining the actual projection area of C2, according to the projection area position ABCD of the projection device C1, the actual projection area of C2 is transformed into the ABCD area through the homography transformation matrix, that is, it completely overlaps the projection area of C1, that is, the dual screen is completed The superposition process. The specific calculation method includes: using the least square method to calculate the homography transformation matrix N1 (superimposition adjustment parameter) from efgh to ABCD. When N1 acts on the projection device C2, the desired projection image area ABCD can be obtained, that is, the superposition process is completed. The calculation methods of homography change matrix include least square method or DLT method. By analogy, any two projection devices can use the same method to superimpose the projection images, so that the projection images of multiple projection devices can be superimposed.

In another embodiment, using the same algorithm as the above embodiment, the actual projection area of the projection device C2 can also be used as the reference projection area, and the actual projection area of the projection device C1 can be transformed to the actual projection area of C2. The projection screens of 2 or more projection devices are superimposed.

The embodiment of the present invention also provides a method for realizing projection screen superimposition. The difference from Embodiment 1 is that before step S11, the method further includes the following step: S10: establishing communication with the first projection device and the second projection device.

Specifically, a method of step S10 includes:

As shown in Figure 3 for example, when establishing communication with the projection device, it is necessary to determine which numbered projection devices are, and it is also necessary to determine which projection area on the projection surface each projection device corresponds to. Therefore, the small-scale identification feature map can include The identification mark of the projection device can also be used as a small-scale identification feature map. An identification mark can be placed in the center of the small-scale identification feature map, as shown in Figure 3, taking the Aruco code as an example, or it can be other easily recognizable marks such as QRcode. In order to achieve higher image accuracy, a small-scale recognition feature map can also be specially designed.

Send recognition image projection commands to all projection devices so that all projection devices project small-scale recognition feature maps on the projection surface, and the small-scale recognition feature images on the projection surface do not overlap; send recognition image capture commands to the image capture device to make The image acquisition device collects the projection surface image, which is the overall image including all the small-scale recognition feature images on the projection surface; recognizes each small-scale recognition feature image in the projection surface image, and obtains the number information of each projection device; The number information can establish communication with each projection device through a wired network or a wireless network.

Specifically, another method of step S10 includes:

S1021: Send a broadcast to all projection devices;

S1022: Receive the number information returned by the two projection devices;

It should be noted that because multiple projection devices communicate through the network, it is possible to send a broadcast to each projection device in the network of the projection device, requesting the projection device to return their respective number information, and after receiving the number information of the projection device, you can The network establishes communication with each projection device through the acquired number information.

The technical solution of the present application recognizes the superimposed characteristic image and the small-scale superimposed characteristic image in the projection surface image, performs positioning of the desired projection area and the projection area of the second projection device, and performs both functions by taking pictures with an external image acquisition device and a homography transformation method. The superposition of the projection images of the two projection devices is simple to operate and difficult to calculate, which is very suitable for wide promotion.

The following describes the device for realizing projection screen superimposition provided by the embodiment of the present invention. It should be noted that the description of the device for realizing projection screen superimposition can refer to the above method for realizing projection screen superimposition, which will not be repeated hereafter.

As shown in FIG. 5, an embodiment of the present invention provides a device for superimposing projection screens, which is applied to a projection system. The projection system includes an image acquisition device, a first projection device, and a second projection device. The set superimposed feature map has a pixel difference with the small-scale superimposed feature map preset by the second projection device, and the specific device includes:

The superimposed image projection module 21 is used to send a superimposed image projection command to the first projection device and the second projection device, so that the first projection device projects the preset superimposed feature map, the second projection The device projects a preset small-scale superimposed feature image on a projection surface, the superimposed feature image on the projection surface and the small-scale superimposed feature image have an overlapped area, and the overlapped area does not block the four corner points of the superimposed feature image ；

The superimposed image acquisition module 22 is configured to send a superimposed image acquisition command to the image acquisition device, so that the image acquisition device collects a projection surface image, and the projection surface image includes a small-scale superimposed feature image on the projection surface and a superimposed feature image Overall image

The superposition parameter calculation module 23 is configured to calculate superposition adjustment parameters of the second projection device according to the projection surface image;

The superimposition parameter sending module 24 is configured to send the superimposition adjustment parameter of the second projection device to the second projection device, so that the second projection device adjusts the projected image according to the superimposition adjustment parameter.

Specifically, the parameter calculation module 23 includes:

Specifically, the device also includes:

It also includes a communication establishment module for establishing communication with the first projection device and the second projection device.

Specifically, the communication establishment module may include:

The recognition image acquisition unit is configured to send a recognition image acquisition command to the image acquisition device, so that the image acquisition device collects a projection surface image, the projection surface image being an overall image including two small-scale recognition characteristic images on the projection surface;

Specifically, another way of the communication establishment module may also include:

Broadcast sending unit for sending broadcast to all projection devices;

The embodiment of the present invention also provides a device for realizing projection screen overlay, including a memory, a processor, and a computer program stored on the memory and running on the processor. When the processor executes the computer program, Realize the above-mentioned method of realizing projected picture superimposition. The device can realize the superposition of the projection images of multiple projection devices. The specific method can be to first determine a projection device as the reference projection screen, and then use each remaining projection device in turn with the projection device as the reference projection screen to calculate the superimposition adjustment parameters using the above-mentioned method of realizing projection screen superposition, and obtain After the superposition adjustment parameters of each projection device are adjusted, the image is simultaneously projected and the projected image is adjusted.

As shown in FIG. 6, an embodiment of the present invention also provides a projection system, including an image acquisition device and at least two projection devices, and also includes the above-mentioned device for realizing projection screen superimposition. The device for realizing projection screen superimposition and the image acquisition device are respectively Establish communication with each projection device.

It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts between the various embodiments, refer to each other. can.

It should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations There is any such actual relationship or order between. Moreover, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also includes Other elements of, or also include elements inherent to this process, method, article or equipment. Without more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or equipment including the above elements.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

A method for realizing the superposition of projection images, characterized in that it is applied to a projection system, the projection system includes an image acquisition device, a first projection device, and a second projection device, the superposition feature map preset by the first projection device and The small-scale superimposed feature map preset by the second projection device has a pixel difference, and the method includes:

S11: Send a superimposed image projection command to the first projection device and the second projection device, so that the first projection device projects the preset superimposed feature map to the projection surface, and the second projection device projects the preset superimposed feature map to the projection surface. A small-scale superimposed feature image, where the superimposed feature image and the small-scale superimposed feature image on the projection surface have an overlapping area, and the overlapping area does not block the four corner points of the superimposed feature image;

S12: Send a superimposed image acquisition command to the image acquisition device, so that the image acquisition device acquires a projection surface image, where the projection surface image is an overall image including a small-scale superimposed feature image and superimposed feature image on the projection surface;

S13: Calculate the superimposition adjustment parameter of the second projection device according to the projection surface image;

S14: Send the overlay adjustment parameter of the second projection device to the second projection device, so that the second projection device adjusts the projected image according to the overlay adjustment parameter.
The method for realizing projected picture superimposition according to claim 1, wherein the method of step S13 comprises:

S131: Identify the superimposed characteristic image area in the projection surface image, obtain the desired projection area of the second projection device in the projection surface image, identify the small-scale superimposed characteristic image area in the projection surface image, and obtain the second A small-scale projection area of the projection device in the projection surface image;

S132: Obtain the feature pattern reduction ratio of the small-scale superimposed feature map of the second projection device, and the feature pattern reduction ratio of the small-scale superimposed feature map of the second projection device, the feature pattern reduction ratio of the small-scale superimposed feature map, and the ratio in the projection surface image A small-scale projection area, calculating the actual projection area of the second projection device in the projection surface image;

S133: Calculate the overlay adjustment parameter of the second projection device according to the actual projection area of the second projection device in the projection surface image and the expected projection area of the second projection device in the projection surface image.
The method for realizing projection screen superimposition according to claim 1, characterized in that, before the step S11, the method further comprises the following step: S10: establishing communication with the first projection device and the second projection device.
The method for realizing projected image superimposition according to claim 3, wherein the method of step S10 includes:

S1011: Send a recognition image projection command to the first projection device and the second projection device, so that the first projection device and the second projection device respectively project their small-scale recognition feature maps on the projection surface, and the Two small-scale recognition feature images do not overlap, and the small-scale recognition feature image includes the identification mark of the projection device;

S1012: Send a recognition image capture command to the image capture device, so that the image capture device captures a projection surface image, where the projection surface image is an overall image including two small-scale recognition feature images on the projection surface;

S1013: Identify the identification marks in the two small-scale identification feature images in the projection surface image, and obtain the number information of the two projection devices;

S1014: Establish communication with the first projection device and the second projection device respectively according to the number information of the two projection devices.
The method for realizing projected image superimposition according to claim 3, wherein the method of step S10 includes:

S1021: Send a broadcast to all projection devices;

S1022: Receive the number information returned by the two projection devices;

S1023: Establish communication with the first projection device and the second projection device respectively according to the number information of the two projection devices.
A device for realizing superimposition of projection images, characterized in that it is applied to a projection system. The projection system includes an image acquisition device, a first projection device, and a second projection device. The superimposition feature map preset by the first projection device and The small-scale superimposed feature map preset by the second projection device has a pixel difference, and the device includes:

The superimposed image projection module is used to send superimposed image projection commands to the first projection device and the second projection device, so that the first projection device projects the preset superimposed feature map to the projection surface, and the second projection device projects the Projecting a preset small-scale superimposed feature map on a surface, where the superimposed feature image and the small-scale superimposed feature image on the projection surface have overlapping areas, and the overlapping area does not block the four corner points of the superimposed feature image;

The superimposed image acquisition module is used to send a superimposed image acquisition command to the image acquisition device, so that the image acquisition device collects a projection surface image, and the projection surface image is a whole including a small-scale superimposed feature image on the projection surface and a superimposed feature image image;

A superposition parameter calculation module, configured to calculate superposition adjustment parameters of the second projection device according to the projection surface image;

The superimposition parameter sending module is configured to send the superimposition adjustment parameter of the second projection device to the second projection device, so that the second projection device adjusts the projected image according to the superimposition adjustment parameter.
The device for realizing superposition of projection images according to claim 6, wherein the superposition parameter calculation module comprises:

The image recognition unit is used to recognize the superimposed characteristic image area in the projection surface image, obtain the desired projection area of the second projection device in the projection surface image, and is also used to recognize the small-scale superposition in the projection surface image A characteristic image area to obtain a small-scale projection area of the second projection device in the projection surface image;

The area calculation unit is used to obtain the feature pattern reduction ratio of the small-scale superimposed feature map of the second projection device, and according to the small-scale superimposed feature map of the second projection device, the feature pattern reduction ratio of the small-scale superimposed feature map and the projection A small-scale projection area in the surface image, calculating the actual projection area of the second projection device in the projection surface image;

The parameter calculation unit is configured to calculate the superimposition adjustment parameter of the second projection device according to the actual projection area of the second projection device in the projection surface image and the expected projection area of the second projection device in the projection surface image.
The device for realizing projection screen superimposition according to claim 6, further comprising a communication establishment module for establishing communication with the first projection device and the second projection device.
A device for superimposing projection screens, comprising a memory, a processor, and a computer program stored on the memory and running on the processor, wherein the processor executes the computer program as follows: The method for realizing superimposition of projected images according to any one of claims 1-5.
A projection system, characterized by comprising an image acquisition device and at least two projection devices, and further comprising the device for realizing projection screen superimposition according to any one of claims 6-8.