A projection device, a projection system and a projection method

Abstract

The application discloses a projection device, a projection system and a projection method, the projection device comprises an invisible light source and a visible light source, an imaging device and a projection device, the imaging device is arranged on the path of the invisible light source, and is used for imaging processing of the invisible light to form an invisible light feature image; the projection device is used for receiving the invisible light feature image, projecting the invisible light feature image to a projection plane to form a feature projection image, forming a visible light image and projecting the visible light image to the projection plane, and receiving monitoring information of the feature projection image and adjusting the projection state of the visible light image on the projection plane. The application can make the adjustment of the projection state of the projection image not be affected by the external environment, reduce the influence of the working environment on the adjustment of the projection state of the projection device, and when multiple projection devices are used for cooperation projection, the external environment can be reduced to affect the cooperation of the multiple projection devices, and the overall working efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of projection technology, and in particular to a projection device, projection system and projection method. Background Technology

[0002] With the development of science and technology and the rapid expansion of information, people have increasingly higher requirements for the visible size of display screens. However, limited by the transmittance of projection devices, a single projection device cannot display a large image. Therefore, multiple projection devices are typically used for projection blending to achieve large-screen projection. On the other hand, in outdoor or large-scale settings, higher brightness projection images are required. Since the brightness of a single projection device is limited, overlay technology has emerged. This involves multiple projection devices projecting the same image, which is then adjusted to ensure complete overlap, resulting in an image brightness equal to the sum of the brightness of all projection devices. Both overlay and blending projection technologies require precise adjustment of the projection state to achieve optimal display results.

[0003] The inventors of this application discovered during long-term research and development that currently, the projection state of a projected image can be adjusted by adding feature images to the projected image. However, in outdoor settings, when the ambient light is high, it significantly affects the brightness of the projected image, resulting in lower visible brightness. Therefore, projection equipment can generally only be set up in low-light conditions such as at night, on cloudy days, or in enclosed environments with low brightness, which is quite limiting. Summary of the Invention

[0004] This invention provides a projection device, projection system, and projection method to solve the technical problem that the operation of multiple projection devices that work together outdoors can only be carried out in low ambient light conditions, which is a significant limitation in the prior art.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is to provide a projection device, comprising:

[0006] An invisible light source and a visible light source are used to emit invisible light and visible light, respectively, and the paths of the invisible light and the visible light partially overlap.

[0007] An imaging device is disposed in the path of the invisible light source and is used to perform imaging processing on the invisible light to form an invisible light feature image;

[0008] A projection device is configured to receive the invisible light feature image and project the invisible light feature image onto a projection plane to form a feature projection image; it is also configured to receive the visible light, perform imaging processing on the visible light to form a visible light image and project it onto the projection plane.

[0009] The projection device is also configured to receive monitoring information of the feature projection image, and adjust a projection state of the visible light image on the projection plane based on the monitoring information.

[0010] In an embodiment, the projection device further comprises a light path guiding device arranged on a path of the invisible light source and the visible light source, and configured to guide the invisible light feature image and the visible light to the projection device respectively.

[0011] In an embodiment, the light path guiding device comprises a dichroic sheet or a band-pass filter.

[0012] In an embodiment, the imaging device comprises an invisible light modulation device and an imaging lens assembly.

[0013] The invisible light modulation device is configured to scan the invisible light and emit the scanned invisible light to the imaging lens assembly.

[0014] The imaging lens assembly receives the scanned invisible light and forms the invisible light feature image based on the scanned invisible light.

[0015] In an embodiment, the imaging lens assembly is an F-Theta imaging system.

[0016] In an embodiment, the projection device comprises a DMD chip configured to project the invisible light feature image to the projection plane, and modulate the visible light to form a visible light image and project the visible light image to the projection plane.

[0017] In an embodiment, the invisible light source is a single infrared light source, and the invisible light modulation device is a two-dimensional invisible light modulation device; or

[0018] The invisible light source is an infrared light source array, and the invisible light modulation device is a one-dimensional invisible light modulation device.

[0019] To solve the above technical problems, another technical solution adopted by the present application is to provide a projection system comprising a monitoring device and the projection device as described above, wherein the monitoring device is configured to collect and monitor at least one set of the invisible light feature images formed by the projection device, so as to adjust a projection state of a visible light projection image of the at least one set of the projection device.

[0020] In an embodiment, the monitoring device comprises an image collection device configured to collect the invisible light feature image, and a display device connected to the image collection device and configured to display the invisible light feature image.

[0021] To solve the above technical problems, the application adopts another technical solution to provide a projection method, comprising:

[0022] The invisible light source and the visible light source respectively emit invisible light and visible light;

[0023] The imaging device receives the invisible light to form an invisible light feature image and emits to a projection device;

[0024] The projection device projects the invisible light feature image to a projection plane to form a feature projection image, receives the visible light to form a visible light image and projects to a projection screen; and adjusts the projection state of the visible light image on the projection plane by using the monitoring information of the received feature projection image.

[0025] The application can adjust the projection state of the projection image without being affected by the external environment by adding an invisible light source and a corresponding imaging device in the projection device to form an invisible light feature image in the projection image, thereby reducing the influence of the working environment on the adjustment of the projection state of the projection device, and improving the overall working efficiency when multiple projection devices are used to cooperate with projection. BRIEF DESCRIPTION OF DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can be obtained from these drawings without creative effort, wherein:

[0027] Figure 1 is a structural schematic diagram of an embodiment of the projection device of the application;

[0028] Figure 2 is a structural schematic diagram of another embodiment of the projection device of the application;

[0029] Figure 3 is a structural schematic diagram of another embodiment of the projection device of the application;

[0030] Figure 4 is a structural schematic diagram of another embodiment of the projection device of the application;

[0031] Figure 5 is a partial structural schematic diagram of the projection device in another embodiment of the projection device of the application;

[0032] Figure 6 is a structural schematic diagram of an embodiment of the projection system of the application;

[0033] Figure 7 is a structural schematic diagram of another embodiment of the projection system of the present application;

[0034] Figure 8 is a schematic diagram of superimposed projection images in another embodiment of the projection system of the present application;

[0035] Figure 9 is a schematic diagram of fused projection images in another embodiment of the projection system of the present application;

[0036] Figure 10 is a flow schematic diagram of an embodiment of the projection method of the present application;

[0037] Figure 11 is a flow schematic diagram of another embodiment of the projection method of the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0039] The terms "first", "second" in the present application are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device. And the term "and / or", is only a description of the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of existence of A alone, existence of A and B together, and existence of B alone. In addition, the character " / " in this paper generally represents an "or" relationship between the associated objects.

[0040] Reference is made to Figure 1The embodiment of the projection device 10 comprises an invisible light source 110, a visible light source 120, an imaging device 200 and a projection device 300. The invisible light source 110 and the visible light source 120 are respectively used for emitting invisible light and visible light, and the paths of the invisible light and the visible light partially overlap. The imaging device 200 is arranged on the path of the invisible light source 110 and is used for imaging processing the invisible light to form an invisible light feature image. The projection device 300 receives the invisible light feature image formed by the imaging device 200 and projects the invisible light feature image to a projection plane to form a feature projection image. Meanwhile, the projection device 300 is also used for receiving visible light, imaging processing the received visible light to form a visible light image and projecting the visible light image to the projection plane. The invisible light feature image can be used as an adjustment mark of the projection state of the visible light image. The projection device 300 can receive monitoring information of the projection state of the feature projection image and adjust the projection state of the visible light image based on the monitoring information.

[0041] For example, the projection device 300 projects the feature projection image on the projection screen, and the monitoring device which can monitor the feature projection image is used to obtain the projection state of the feature projection image (the projection state can include the projection position, the projection size, the projection definition and the like). Thus, the projection device 300 can adjust the projection state of the visible light image according to the received monitoring information of the projection state of the feature projection image. Taking the projection position as an example, the projection position of the projection picture of the projection device 300 on the projection plane is difficult to determine in the initial state. At this time, the projection device 300 forms the feature projection image formed by the invisible light on the projection plane, further obtains the monitoring information of the projection position of the feature projection image, and adjusts the position or the projection state of the projection device 300 according to the monitoring information to adjust the feature projection image to be projected to the A position. At this time, it is equivalent to adjust the projection state of the visible light image. Since the visible light image is also projected to the projection plane by the projection device 300, the visible light image can also be projected at the A position.

[0042] The embodiment of the present application can make the projection state adjustment of the projection image not be affected by the external environment by adding the invisible light source 110 and the corresponding imaging device 200 in the projection device 10 to form the invisible light feature image in the projection image, so as to reduce the influence of the working environment on the projection state adjustment of the projection device. When multiple projection devices are used for cooperation projection, the influence of the external environment on the cooperation of the multiple projection devices can be reduced, the overall working efficiency is improved, and the engineering cycle is shortened.

[0043] In the embodiment, the paths of the invisible light and the visible light after passing through the projection device 300 are overlapped.

[0044] In the embodiment, the projection state of the projection image of the visible light on the projection plane is adjusted by using the feature projection image. Specifically, the feature projection image can be set to a special shape, such as a cross shape, a triangle shape, or the like. The projection state of the feature projection image with the special shape (the projection state can include a projection position, a projection size, a projection definition, or the like) is obtained, and the position, the state, the projection focal length, or the like of the projection device is adjusted, and then the projection state of the visible light image projected by the projection device is adjusted. When multiple projection devices are used for projection, the feature projection images in at least two projection images are overlapped to achieve the projection state adjustment, so that the projection images emitted by the multiple projection devices 10 can be superimposed or fused to synthesize a projection image with a larger area or a higher brightness, to adapt to different projection occasions.

[0045] Referring to Figure 2 Further, the projection device 300 can be connected to and controlled by an image input control device 400, and the imaging device 200 can be connected to and controlled by an imaging control device 230. In the embodiment, the imaging control device 230 sends an imaging control instruction to the imaging device 200 based on preset image information, so that the imaging device 200 forms an invisible light feature image corresponding to the preset image information based on the imaging control instruction. Further, the image input control device 400 sends a projection control instruction to the projection device 300 according to the preset image information, so that the projection device 300 projects the invisible light feature image to the projection plane based on the projection control instruction to form a feature projection image. Thus, the invisible light is finally projected onto the projection plane by the imaging device and the projection device to form the feature projection image corresponding to the preset image information. The preset image information can be a triangle, a cross, or other image information with a pattern that is easy to identify. For example, the image input control device 400 sends a corresponding control instruction to the imaging control device 230 based on the preset image information of the cross to be formed, and the imaging control device 230 controls the imaging device 200 based on the control instruction, so that the imaging device 200 performs imaging processing on the invisible light to form an invisible light image corresponding to the preset image information, which is a cross. Further, the image input control device 400 sends a projection control instruction to the projection device 300 according to the preset image information of the cross to be formed. When the imaging device 200 forms the invisible light image corresponding to the preset image information, which is a cross, is transmitted to the projection device 300, the corresponding modulation is finally performed to project a cross-shaped feature projection image on the projection plane.

[0046] In the embodiment, the image input control device 400 and / or the imaging control device 230 can be an internal control device built in the projection device 10, or can be an external control device connected to the projection device 10 through a communication control interface. In the embodiment, the imaging device 200 includes the invisible light modulation device 210 and the imaging lens assembly 220, the invisible light modulation device 210 is configured to image modulate the invisible light and emit the image modulated invisible light to the imaging lens assembly 220, and the imaging lens assembly 220 receives the image modulated invisible light and forms the invisible light feature image based on the image modulated invisible light.

[0047] In the embodiment, the invisible light source 110 can be a single infrared light source, for example, a single IR LD (Infrared Radiation Laser diode), and correspondingly, the invisible light modulation device 210 can be a two-dimensional invisible light modulation device, for example, a two-dimensional galvanometer. By setting the invisible light modulation device 210, the energy utilization rate of the infrared light can be improved, and the energy consumption can be reduced.

[0048] In other embodiments, the invisible light source 110 can also be an infrared light source array, for example, a linear array IR LD or a two-dimensional array IR LD, and the invisible light modulation device 210 can also be a single-dimensional invisible light modulation device. By setting the array IR LD, the structure of the invisible light modulation device 210 can be made more simple, and the brightness of the infrared light can be increased.

[0049] In the embodiment, the imaging lens assembly 220 can be an F-Theta (flat field focusing lens) imaging system. The F-Theta imaging system includes a plurality of lenses, and the design of the plurality of lenses has a barrel distortion, so that the offset size of the emitted light rays and the offset angle of the incident light rays form a simple linear correspondence relationship, which does not need complex electronic correction, can realize more compact spot size, and thus can be suitable for fast, miniaturized and relatively inexpensive scanning imaging devices.

[0050] In the embodiment, the visible light source 120 can be an RGB (Red Green Blue) light source.

[0051] Referring to Figure 3 In another specific embodiment, the projection device 10 can further include a light path guiding device 500, which is arranged on the paths of the invisible light source 110 and the visible light source 120, and is configured to guide the invisible light feature image and the visible light to the projection device 300, respectively.

[0052] In the embodiment, the paths of the invisible light and the visible light after passing through the light path guiding device 500 are overlapped.

[0053] In the embodiment, the light path guiding device 500 comprises a dichroic sheet, for example, a dichroic sheet which transmits invisible light and reflects visible light. Referring to Figure 4 In other embodiments, the dichroic sheet can also be a dichroic sheet which transmits visible light and reflects invisible light, which is not limited herein.

[0054] In other embodiments, the light path guiding device 500 can also comprise a band-pass filter sheet or other components which can transmit one of the visible light and the invisible light and reflect the other, which is not limited herein.

[0055] In the embodiment, the projection device 300 comprises a mirror assembly 310, an imaging lens 320 disposed on the mirror assembly 310, and a projection plane opposite to the imaging lens 320. The invisible light feature image and the visible light are projected to the projection plane via the mirror assembly 310 and the imaging lens 320 to form a projection image on the projection plane.

[0056] The mirror assembly 310 comprises a DMD (Digital Micro-mirror Device) chip 311 and a TIR (Total Internal Reflection) prism assembly 312. The DMD chip 311 is connected with the image input control device 400 and cooperates with the TIR prism assembly 312 to reflect the invisible light feature image and the visible light to the imaging lens 320. The DMD chip 311 is used to project the invisible light feature image to the projection plane and modulate the visible light to form a visible light image and project the visible light image to the projection plane. Further, the DMD chip 311 can be connected with and controlled by the image input control device 400 to project the invisible light feature image to the projection plane according to the projection control instruction and modulate the visible light to form a visible light image and project the visible light image to the projection plane.

[0057] In the embodiment, the mirror assembly 310 can be a single-DMD mirror assembly.

[0058] In other embodiments, the mirror assembly 310 can also be a multi-DMD mirror assembly, for example Figure 5 As shown, the invisible light feature image and the visible light enter the TIR prism assembly 316, pass through the blue DMD chip 313 and the corresponding TIR prism to reflect the blue light and transmit the yellow light, pass through the green DMD chip 314 and the corresponding TIR prism to reflect the green light and transmit the red light, and pass through the red DMD chip 315 and the corresponding TIR prism to combine with the blue light and the green light and exit to the imaging lens 320. Since the wavelength of the infrared light in the embodiment is close to the wavelength of the red light in the visible light, the infrared light and the red light can share the same light path.

[0059] Since the reflection of the mirror inside the DMD mirror assembly has no direct relationship with the wavelength, it has strong reflection ability for visible light and infrared light, so by setting the DMD mirror assembly in the embodiment, the reflection of the infrared light can be avoided, so that the projection state can be adjusted by the characteristic image formed by the infrared light.

[0060] In the embodiment, the TIR prism and the imaging lens 320 both have infrared imaging functions.

[0061] Referring to Figure 6 , the embodiment of the projection system includes a projection device 10 and a monitoring device 700, and the monitoring device 700 is used to collect and monitor the invisible light characteristic image formed by the projection device 10 to adjust the projection state of the visible light projection image of the projection device 10. The structure of the projection device 10 is described above, and will not be repeated here.

[0062] In the embodiment, the monitoring device 700 includes an image acquisition device 710 and a display device 720, the image acquisition device 710 is used to acquire the invisible light characteristic image, and the display device 720 is connected with the image acquisition device 710 and is used to display the invisible light characteristic image.

[0063] In the embodiment, the image acquisition device 710 can be an infrared CCD (Charge-coupled Device, Charge-coupled Device) camera, and the display device 720 can be an infrared display device.

[0064] Specifically, the image input control device 400 controls the invisible light modulation device 210 to scan the invisible light emitted by the invisible light source 110 according to the characteristic image signal through the scanning control device 230, so as to form the invisible light characteristic image through the imaging device 200, and the visible light is combined through the imaging lens assembly 220, and then the image input control device 400 controls the projection device 300 to form the characteristic projection image, so as to realize the Local Dimming (Local Dimming) function. The characteristic projection image is collected by the monitoring device 700, so as to adjust the projection state of the projection image according to the characteristic image.

[0065] In the embodiment, the image input control device 400 can also adjust and control the DMD imaging according to different working modes. For example, when only the projection state of the projection image needs to be adjusted without displaying the normal projection image, only the invisible light can be adjusted without adjusting the visible light, the invisible light characteristic image formed by the invisible light is used to adjust the projection state of the projection image, and the projection image can be displayed as black and white effect.

[0066] Referring toFigure 7 Another embodiment of the projection system of the present application comprises at least two projection devices 10 and a monitoring device 700. The structure of the projection device 10 is described above and will not be repeated here. The monitoring device 700 is used to collect a feature projection image from at least two projection images formed by the at least two projection devices 10, and to perform superimposition or fusion according to the feature projection image.

[0067] Referring to Figure 7 and Figure 8 In an embodiment, the at least two projection devices comprise a first projection device 101 and a second projection device 102. The first projection device 101 is used to form a first projection image 810, and the first projection image 810 comprises a first invisible light feature image 811. The second projection device 102 is used to form a second projection image 820, and the second projection image 820 comprises a second invisible light feature image 821. The positions of the first projection device 101 and the second projection device 102 are set such that the first invisible light feature image 811 and the second invisible light feature image 821 coincide, so that the first projection image 810 and the second projection image 810 are superimposed to form a complete projection image 830.

[0068] Referring to Figure 7 and Figure 9 In another embodiment, the at least two projection devices comprise a first projection device 101 and a second projection device 102. The first projection device 101 is used to form a third projection image 840, and the third projection image 840 comprises a third invisible light feature image 841. The second projection device 102 is used to form a fourth projection image 850, and the fourth projection image 850 comprises a fourth invisible light feature image 851. The positions of the first projection device 101 and the second projection device 102 are set such that the third invisible light feature image 841 and the fourth invisible light feature image 851 coincide, so that the third projection image 840 and the fourth projection image 850 are fused to form a complete projection image 860.

[0069] In the above two embodiments, the monitoring device 700 can be used to monitor the invisible light feature image, so that the positions of the projection devices can be adjusted according to the invisible light feature image, so that the fusion or superimposition effect is more accurate.

[0070] It can be understood that when there are more projection devices, some of the projection devices can be used for fusion, and some of the projection devices can be used for superimposition.

[0071] Referring to Figure 10 An embodiment of the projection method of the present application comprises:

[0072] S201, an invisible light source and a visible light source emit invisible light and visible light, respectively;

[0073] S202, the imaging device receives the invisible light to form an invisible light feature image and emits to the projection device;

[0074] S203, the projection device projects the invisible light feature image to the projection plane to form a feature projection image, receives the visible light to form a visible light image and projects to the projection screen; and adjusts the projection state of the visible light image on the projection plane by using the monitoring information of the received feature projection image.

[0075] The structure of the projection device for implementing the projection method of the present application is described above, and will not be repeated here.

[0076] The embodiment of the present application adds the invisible light source 110 and the corresponding imaging device 200 in the projection device 10 to form the invisible light feature image in the projection image, so that the projection state adjustment of the projection image is not affected by the external environment, thereby reducing the influence of the working environment on the projection state adjustment of the projection device, and when multiple projection devices are used for projection, the influence of the external environment on the cooperation of multiple projection devices is reduced, the overall working efficiency is improved, and the engineering cycle is shortened.

[0077] Referring to Figure 11 , another embodiment of the projection method of the present application comprises:

[0078] S301, the invisible light source and the visible light source emit invisible light and visible light respectively;

[0079] S302, the imaging device receives the invisible light to form an invisible light feature image and emits to the projection device;

[0080] S303, the projection device projects the invisible light feature image to the projection plane to form a feature projection image, receives the visible light to form a visible light image and projects to the projection screen;

[0081] S304, the monitoring device collects and monitors the invisible light feature image to adjust the projection state of the visible light image on the projection plane by using the monitoring information of the received feature projection image.

[0082] The structure of the projection system for implementing the projection method of the present application is described above, and will not be repeated here.

[0083] The embodiment of the present application can form the invisible light feature image in the projection image by adding the invisible light source 110 and the corresponding imaging device 200 in the projection device 10, can make the projection state adjustment of the projection image not affected by the external environment, can reduce the influence of the working environment on the projection state adjustment of the projection device, can reduce the influence of the external environment on the cooperation of the multiple projection devices when the multiple projection devices cooperate to project, can improve the overall working efficiency, and can shorten the engineering cycle.

[0084] The above description is only the embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is based on the content of the specification and drawings of the present application, is also included in the patent protection scope of the present application.

Claims

1. A projection device capable of emitting visible light images, characterized in that, The projection device comprises: a non-visible light source and a visible light source, respectively used for emitting non-visible light and visible light, the paths of the non-visible light and the visible light partially overlap; an imaging device arranged on the path of the non-visible light source, used for imaging the non-visible light to form a non-visible light feature image; a projection device used for receiving the non-visible light feature image and projecting the non-visible light feature image to a projection plane to form a feature projection image, and used for receiving the visible light, imaging the visible light to form a visible light image and projecting the visible light image to the projection plane; the projection device is further used for receiving monitoring information of a projection state of the feature projection image, and adjusting the projection state of the visible light image on the projection plane based on the monitoring information, so as to realize superimposition or fusion of visible light images emitted by a plurality of the projection devices.

2. The projection device according to claim 1, characterized in that, The projection device further comprises a light path guiding device arranged on the paths of the non-visible light source and the visible light source, used for guiding the non-visible light feature image and the visible light to the projection device respectively.

3. The projection device according to claim 2, characterized in that, The light path guiding device comprises a dichroic sheet or a band-pass filter sheet.

4. The projection apparatus according to claim 1, wherein, The imaging device comprises a non-visible light modulation device and an imaging lens assembly; the non-visible light modulation device is used for scanning the non-visible light and emitting the scanned non-visible light to the imaging lens assembly; the imaging lens assembly receives the scanned non-visible light and forms the non-visible light feature image based on the scanned non-visible light.

5. The projection apparatus according to claim 4, wherein, The imaging lens assembly is an F-Theta imaging system.

6. The projection apparatus according to claim 1, wherein, The projection device comprises a DMD chip used for projecting the non-visible light feature image to the projection plane, and modulating the visible light to form a visible light image and projecting the visible light image to the projection plane.

7. The projection apparatus according to claim 1, wherein, The non-visible light source is a single infrared light source, and the non-visible light modulation device is a two-dimensional non-visible light modulation device; or The non-visible light source is an infrared light source array, and the non-visible light modulation device is a one-dimensional non-visible light modulation device.

8. A projection system, characterized by The projection device comprises a monitoring device used for collecting and monitoring at least one set of non-visible light feature images formed by the projection devices, so as to adjust the projection state of the visible light projection images of the at least one set of the projection devices.

9. The projection system of claim 8, wherein, The monitoring device comprises an image collection device used for collecting the non-visible light feature images, and a display device connected with the image collection device and used for displaying the non-visible light feature images.

10. A projection method based on claim 1, characterized in that, The projection device comprises: a non-visible light source and a visible light source respectively emitting non-visible light and visible light; an imaging device receiving the non-visible light to form a non-visible light feature image and emitting to a projection device; The projection device projects the invisible light feature image to a projection plane to form a feature projection image, receives the visible light to form a visible light image and projects to a projection screen; and adjusts the projection state of the visible light image on the projection plane by using the monitoring information of the projection state of the received feature projection image.

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