WO2020042568A1 - Projection method, projection device, and computer readable storage medium - Google Patents

Abstract

The present invention provides a projection method, a projection device, and a computer readable storage medium. The projection method comprises the following steps: calculating, according to an acquired projection image picture and a measured projection distance, an offset direction and an offset amount of the projection image picture on a projection screen, and correcting the projection position of the projection image picture according to the offset direction and the offset amount. By using the projection method, the projection device does not require manual adjustment and there is no need to perform comparison and adjustment for multiple times, the device can easily be used, and the user experience is improved.

Description

Projection method, projection equipment and computer-readable storage medium Technical field

The present invention relates to the field of projection technology, and in particular, to a projection method, a projection device, and a computer-readable storage medium.

Background technique

This section is intended to provide a background or context to the specific embodiments of the invention that are set forth in the claims. The description herein is not admitted to be prior art by inclusion in this section.

Projectors are used in conferences and teaching in daily life. Projectors play a pivotal role in our lives. In daily home application scenarios, the lens of the projector is heated during the work process, which causes a certain degree of shift in the picture emitted by the lens to the screen. When using a screen of a specific size, a large shift will affect the customer's viewing Feel. And during use, the projection image of the projector will also change due to the passage of time, which will affect the projection effect.

In the prior art, a projector requires a user to manually or gradually adjust the projection direction and angle of the projector through a remote control. The lack of a solution for quickly and effectively correcting the position of the screen projected by the projector is not conducive to improving the user experience.

Summary of the Invention

In order to solve the technical problem that the projector cannot automatically correct the projected image frame in the prior art, the present invention provides a projection method that can automatically adjust the position of the projected image. The present invention also provides a projection device and a computer-readable storage medium.

A projection method includes the following steps:

According to the acquired projection image frame and the measured projection distance, an offset direction and an offset amount of the projection image frame on the projection screen are calculated, and according to the offset direction and the offset amount, the offset The projection position of the projected image screen is corrected.

A projection device includes a housing, a lens device provided on a surface of the housing, an image acquisition device, a distance sensor, and a control device and a light modulation device provided inside the housing;

The control device is configured to control the distance sensor to measure a projection distance;

The control device is further configured to control the light modulation device to modulate light and emit image light, and the image light passes through the lens device and is irradiated to a projection screen to form a projection image screen;

The control device and the control device are used to control the image acquisition device to collect a projection image frame, and calculate an offset direction and an offset of the projection image frame on the projection screen according to the acquired projection image frame and the measured projection distance. To correct the projection position of the projected image frame.

A computer-readable storage medium stores therein a computer program that, when executed, implements a projection method as described above.

The projection device provided by the present invention adopts the projection method, and calculates an offset direction and an offset amount of the projection image screen in the image coordinate system according to the acquired projection image screen and the measured projection distance, and according to the offset, The direction and the offset amount, to realize the correction of the projected image screen. The projection device in the present invention adopts the projection method, which does not require manual adjustment and does not need to undergo multiple contrast adjustments, is convenient to use, and is beneficial to improving user experience.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions of the embodiments / modes of the present invention more clearly, the drawings used in the description of the embodiments / modes are briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. For a person of ordinary skill in the art, without drawing creative labor, other drawings may be obtained according to these drawings.

FIG. 1 is a schematic structural diagram of a projection device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a projection method adopted by the projection device shown in FIG. 1.

FIG. 3 is a schematic structural diagram of a projection device according to a second embodiment of the present invention.

FIG. 4 is a flowchart of a projection method adopted by the projection device shown in FIG. 3.

Explanation of main component symbols

Projection equipment	100, 200
case	110, 210
Lens device	120, 220
Image acquisition device	130
distance sensor	140
Drive	250

The following specific embodiments will further explain the present invention in conjunction with the above drawings.

detailed description

In order to understand the above-mentioned objects, features, and advantages of the present invention more clearly, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the present invention. The described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

The invention provides a projection method and a projection device. The projection device applies the projection method, which does not need manual adjustment and does not need to undergo multiple contrast adjustments, and can conveniently use a projector to realize automatic projection image screen correction.

Please refer to FIG. 1, which is a schematic structural diagram of a projection device 100 according to a first embodiment of the present invention. The projection device 100 includes a housing 110, a lens device 120 provided on the surface of the housing, an image acquisition device 130, a distance sensor 140, and a control device (not shown) and a light modulation device (not shown) provided inside the housing 110.示). The control device is configured to control the light modulation device to modulate light and emit image light, and the image light is irradiated to the screen through the lens device 120 to form a projected image screen; the control device is further configured to control the image acquisition device 130 Collect a projection image screen, control the distance sensor 140 to measure the projection distance, and use the projection method provided by the present invention to perform image correction.

Specifically, the light modulation device is an LCD (Liquid Crystal Display), an LCOS (Liquid Crystal), a liquid crystal with silicon (also called silicon-based liquid crystal), or a DMD (Digital Mirror Device, Digital Micromirror Device). Mirror element). Generally, the projection apparatus 100 further includes a light source device (not shown) for emitting light to the light modulation device, and the light modulation device includes a modulation area for performing light modulation, and the modulation area A plurality of pixels for modulating light are arranged in an array, and the modulation area is used to modulate incident light and emit the image light. The light emitted from the modulation area passes through the lens device 120 to form a projection image frame on the projection screen.

In the embodiment of the present invention, the structure of the lens device 120 is not limited. Generally, the lens device 120 includes a plurality of lenses. In one embodiment, the lens device 120 includes a mirror group, a first lens group having a positive refractive power, and a second lens group. The second lens group has a positive refractive power and is disposed on a side of the first lens group remote from the light modulation device, and the second lens group includes a plurality of lenses. When the image light emitted by the light modulation device passes through the lens device 120, the image light can pass through the optical axis of the first lens group and the optical axis of the second lens group, and the second A field angle produced by the lens group is less than 100 degrees. The mirror group has a negative reflection power and is located on a side of the second lens group far from the first lens group. The mirror has a reflective curved surface for reflecting after passing through the second lens group. Image light. Due to the configuration of the first lens group, the second lens group, and the mirror group, the lens device 120 provides the function of a wide-angle lens group through the mirror group, so that the lens device 120 can maintain good imaging quality, The overall volume is reduced, and production costs are reduced.

The image acquisition device 130 includes a circuit board, an image sensor, a filter, and a lens assembly. The image sensor is mounted on the middle of the circuit board. The circuit board surrounding the image sensor has a passive component and connects the image sensor and the passive component. A gold wire is formed on the non-photosensitive area of the image sensor with a ring-shaped flange surrounding the photosensitive area of the image sensor. The image sensor and the circuit board outside the ring-shaped flange are formed by plastic sealing material. A plastic package covered with passive components and gold wires, a sinking groove is formed in the middle of the upper side of the plastic package, and the periphery of the filter is attached to the sinking groove; the lens assembly is mounted on The upper side of the plastic package. The image acquisition device 130 is a compact and direct-fitting type image acquisition device with a filter. It is used to dispense and dry the adhesive around the non-photosensitive area around the image sensor for a week to form a ring-shaped edge, which can prevent the plastic sealing material from entering the image during molding. The photosensitive area of the sensor can prevent the mold from crushing the photosensitive area of the image sensor during molding; the non-photosensitive area of the image sensor and the surrounding passive components and gold wires are all cast together by a plastic package formed by a molding material to form a Compared with the combination of the traditional bracket and the circuit board, the overall structure reduces the space occupied by the bracket, thereby achieving the purpose of reducing the size of the camera module and enhancing the reliability of the product.

The distance sensor 140 includes one of an infrared ranging device or a laser ranging device. In one embodiment, the distance sensor 140 uses a phase method to measure the projection distance, that is, the distance sensor 140 amplitude-modulates the emitted light and measures the phase delay caused by the outgoing light returning once, and then converts the wavelength according to the wavelength of the outgoing light The distance represented by the phase delay. In one embodiment, the distance sensor 140 uses the pulse method to measure the first distance, that is, the light emitted by the distance sensor 140 is reflected by the projection screen and then received by the distance sensor 140. The distance sensor 140 records the light traveling back and forth. time. The distance measurement result corresponding to the projection distance is converted according to the wavelength of the emitted light. In addition, the distance sensor 140 may include a distance measurement sensor and a processor, and the processor processes an output signal of the distance measurement sensor to obtain the projection distance. In another embodiment, the distance sensor 140 includes a distance measurement sensor, and the control device in the projection device 100 processes the output signal of the distance measurement sensor to obtain the projection distance.

Further, the control device in the projection device 100 may be a single-chip microcomputer, a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), and application-specific integrated circuits (Applications). Specific Integrated Circuit (ASIC), ready-made programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

Please refer to FIG. 2, which is a flowchart of a projection method adopted by the projection device 100 shown in FIG. 1. The projection method in the present invention calculates an offset direction and an offset amount of the projection image screen on the projection screen according to the acquired projection image screen and the measured projection distance, and according to the offset direction and The offset amount is used to correct a projection position of the projection image screen. Further, the shift amount of the projection image picture on the projection screen is converted into an offset pixel amount of the modulation image in the light modulation device, or converted into an optical axis of the lens device 120 to shift the projection image. Offset of the center axis axis of the screen, and according to the offset pixel amount of the modulation image or the optical axis offset from the center axis axis of the projection image screen, the projection position of the projection image screen is performed Correction. Correspondingly, the control device is configured to convert an offset amount of the projection image picture on the projection screen into an offset pixel amount of the modulated image in the light modulation device, or convert it into an optical axis of the lens device 120 Offset the central axis axis of the projected image screen from the offset amount of the modulated image or the optical axis from the central axis axis of the projected image screen to the projection The projection position of the image frame is corrected.

In this embodiment, implementing the above projection method by using the control device includes the following steps:

S101: Calculate the offset direction and amount of the projection image screen on the projection screen according to the acquired projection image screen and the measured projection distance.

Prior to step S101, a projection image screen projected onto the projection screen may also be collected by the image acquisition device 130, and it may be determined whether the projection image screen is shifted based on a position of a frame of the projection screen. If there is an offset, step S101 is performed, and if there is no offset, it is determined whether there is an offset in the next captured frame of the projected image picture according to the instruction.

In the embodiment of the present invention, the image capture device 130 is configured to capture the projected image frame, the distance sensor 140 is configured to measure the projected distance, and the control device is configured to collect the projected image frame and the measured projected distance based on the acquired projected image frame. , Calculating a shift direction and a shift amount of the projection image picture on the projection screen.

In a preferred embodiment, the image acquisition device 130 is disposed on the top of the lens device 120, and the distance sensor 140 is disposed on the bottom of the lens device 120. It can be understood that the image acquisition device 130 and the distance sensor 140 can also be disposed adjacent to each other. Alternatively, it may be disposed at another position of the lens device 120.

It should be noted that, in the embodiment of the present invention, the projection screen includes a frame, and the size of the area within the frame is X * Y. Ideally, the size of the projection image screen in the projection screen is X * Y The unit is length, such as mm or cm. It can be understood that, in other embodiments, the size of the area within the frame may be larger than X * Y, and a gap is also provided between the projected image screen and the frame.

According to the distance Δp, the magnification β, and the distances ΔP and ΔQ between the detected projection image picture and the frame of the projection screen of the adjacent photosensitive units in the image acquisition device 130, the projection image picture on the projection screen Offsets Δx and Δy. The image acquisition device 130 includes a plurality of photosensitive units arranged in an array, and each photosensitive unit is configured to convert an incident optical signal into a corresponding electric signal. The distance between adjacent photosensitive units is Δp, and the offset pixel amount of the projection image detected by the image acquisition device 130 is ΔP * ΔQ, which has a pixel unit. ΔP and ΔQ refer to the distance between the detected projection image screen and the frame of the projection screen among the projection image screens collected by the control device,

Δx = ΔP * Δp * β;

Δy = ΔQ * Δp * β.

In this embodiment, the projection distance is the measured distance L between the image acquisition device 130 and the projection screen, and the focal length of the image acquisition device 130 is f, where the optical length of the lens assembly is d, the front focal length is f1, and the rear focal length. Is f2, and the above parameters are all known quantities, the image magnification β of the image acquisition device 130 can be calculated:

A = L-d-f1-f2.

According to the above formulas, according to the acquired projection image screen and the measured projection distance L, further, according to the distance Δp, the magnification β, and the detected projection image of the adjacent photosensitive unit of the image acquisition device 130 in the projection device 100 The distances ΔP and ΔQ between the frame and the frame of the projection screen are calculated to obtain the offsets Δx and Δy of the projection image frame on the projection screen.

S102: Convert the offset amounts Δx, Δy of the projection image screen on the projection screen into offset pixel amounts ΔS, ΔT of the modulated image in the light modulation device.

Specifically, the offset pixel amounts ΔS, ΔT of the modulated image are calculated according to the dimensions X, Y and the offset amounts Δx, Δy of the projected image screen, and the number of pixels M * N in the modulation area, As shown in the following formula:

S103: Compress the modulation image according to the offset pixel amount of the modulation image, and then control the compression-processed modulation image in a modulation region of the light modulation device to be opposite to the projection image screen offset direction Move in the direction.

The image light emitted from the moved modulation area passes through the lens device 120 to be imaged on the projection screen, and the projection image frame completely falls into the area surrounded by the frame of the projection screen.

The projection device 100 provided in the embodiment of the present invention adopts the projection method, and calculates an offset direction and an offset amount of the projection image screen on the projection screen according to the acquired projection image screen and the measured projection distance, and According to the offset direction and the offset amount, an offset pixel amount of a modulation image in a corresponding light modulation device is calculated, thereby realizing correction of a projection position of the projection image screen. The projection device 100 adopts the projection method, which does not require manual adjustment and does not require multiple contrast adjustments. It is convenient to use and is beneficial to improving the user experience.

Please refer to FIG. 3, which is a schematic structural diagram of a projection device 200 according to a second embodiment of the present invention. The difference between the projection device 200 and the projection device 100 according to the embodiment of the present invention is that the projection device 200 further includes a driving device 250 connected between the lens device 220 and the control device. The control device sends a control signal according to the offset of the optical axis of the lens device 200 from the central axis of the projection image screen, and the driving device 250 drives the optical axis of the lens device 220 to exceed the projection image screen according to the control signal. Move in the direction of the central axis. It should be noted that within the scope of the spirit or basic features of the present invention, the specific solutions applicable to the first embodiment can also be correspondingly applied to the second embodiment. To save space and avoid repetition, here Will not repeat them.

Referring to the projection method in this embodiment, the same as the first embodiment is that the projection position of the projection image screen is projected according to the offset direction and amount of the projection image screen on the projection screen. Make corrections.

Please refer to FIG. 4, which is a flowchart of a projection method adopted by the projection device 200 shown in FIG. 3. The projection method in the present invention includes converting an offset amount of the projection image frame on the projection screen into an offset pixel amount of the modulated image in the light modulation device, or converting the optical axis offset of the lens device 220 Shifting the shift amount of the central axis of the projection image screen, and shifting the projection image based on the offset pixel amount of the modulation image or the shift amount of the optical axis from the central axis of the projection image screen The projection position of the screen is corrected. Correspondingly, the control device is configured to convert an offset amount of the projection image picture on the projection screen into an offset pixel amount of the modulated image in the light modulation device, or convert it into an optical axis of the lens device 220 Offset the central axis axis of the projected image screen from the offset amount of the modulated image or the optical axis from the central axis axis of the projected image screen to the projection The projection position of the image frame is corrected.

In this embodiment, the projection method includes:

S201: Calculate an offset direction and an offset Δx, Δy of the projection image screen on the projection screen according to the acquired projection image screen and the measured projection distance. Step S201 is the same as step S101, and details are not described herein.

S202: Convert the offset amounts Δx and Δy of the projection image screen on the projection screen into offset amounts Δu and Δv of the optical axis of the lens device 220 from the central axis of the projection image screen.

Calculate the magnification γ of the lens device 220 according to the pixel interval Δq of the light modulation device, the number of pixels M * N used to modulate the image, and the sizes X and Y of the projected image screen,

γ = X / (Δq * M).

Calculate the shift amount Δu of the optical axis from the central axis of the projection image screen according to the shift amounts Δx and Δy of the projection image screen on the projection screen and the magnification γ of the lens device 220 , Δv:

Δu = Δx / γ

Δv = Δy / γ.

S203: According to the shift amount of the optical axis from the central axis of the projection image screen, the optical axis of the driving lens device 220 is moved in the direction of the central axis of the projection image screen.

In one embodiment, after the control device calculates an offset of the optical axis from the central axis of the projection image screen, it outputs an offset from the central axis of the central axis of the projection image screen from the optical axis. Pulse signal corresponding to the offset.

The driving device 250 includes a driving chip and a stepping motor. The driving chip outputs a corresponding driving signal according to the pulse signal. The stepping motor receives the driving signal to drive the lens device 220 to move. The moved lens device 220 is imaged on a projection screen, and the projected image frame completely falls into an area surrounded by a frame of the projection screen.

In this embodiment, the projection device 200 adopts the above-mentioned projection method, and calculates the offset direction and amount of the projection image screen on the projection screen based on the acquired projection image screen and the measured projection distance, and according to An offset of the projection image screen on the projection screen, and an offset of an optical axis of the lens device 220 from an axis of the central axis of the projection image screen is calculated, so as to implement a projection position of the projection image screen Correction. The projection device 200 adopts the projection method, which does not require manual adjustment and does not require multiple contrast adjustments, is convenient to use, and is beneficial to improving user experience.

The numbers S101-S103 and S201-S203 in the above steps are not used to limit the sequence of steps. The order of steps can be reversed. You can also add other steps or delete corresponding steps between the above steps.

The present invention also provides a computer-readable storage medium in which a computer program is stored, and when the computer program is executed, the projection method as described above is implemented.

It is obvious to a person skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, the embodiments are to be regarded as exemplary and non-limiting in every respect, and the scope of the present invention is defined by the appended claims rather than the above description, and therefore is intended to fall within the claims. All changes that come within the meaning and scope of equivalents are encompassed by the invention. Any reference signs in the claims should not be construed as limiting the claims involved. In addition, it is clear that the word "comprising" does not exclude other units or steps, and that the singular does not exclude the plural. Multiple devices stated in a device claim may also be implemented by the same device or system through software or hardware. Words such as first and second are used to indicate names, but not in any particular order.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be Modifications or equivalent substitutions can be made without departing from the spirit and scope of the technical solution of the present invention.

Claims (14)

1. A projection method includes the following steps:

   According to the acquired projection image frame and the measured projection distance, an offset direction and an offset amount of the projection image frame on the projection screen are calculated, and according to the offset direction and the offset amount, the offset The projection position of the projected image screen is corrected.
2. The projection method according to claim 1, wherein, based on the acquired projection image screen and the measured projection distance, calculating a shift direction and an offset amount of the projection image screen on the projection screen, and Correcting the projection position of the projection image screen according to the offset direction and the offset amount includes:

   Converting an offset of the projection image picture on the projection screen into an offset pixel amount of a modulated image in a light modulation device, or converting an optical axis of a lens device to an offset of a central axis of the projection image screen A shift amount, and the projection position of the projection image screen is corrected according to the offset pixel amount of the modulated image or the optical axis offset from the central axis of the projection image screen.
3. The projection method according to claim 2, wherein the shift amount of the projection image picture on the projection screen is converted into an offset pixel amount of a modulated image in a light modulation device, or is converted into a lens The optical axis of the device is offset from the central axis axis of the projection image screen, and according to the offset pixel amount of the modulated image or the optical axis from the central axis axis of the projection image screen, Correcting the projection position of the projection image screen includes:

   Converting an offset amount of the projection image picture on the projection screen into an offset pixel amount of a modulated image in the light modulation device;

   Compressing the modulated image according to the offset pixel amount of the modulated image, and then controlling the compressed processed modulated image in a modulation region of the light modulation device in a direction opposite to the projection image screen offset direction mobile.
4. The projection method according to claim 3, wherein

   The converting the offset amount of the projection image picture on the projection screen into the offset pixel amount of the modulation image in the light modulation device includes:

   The offset pixel amount of the modulated image is calculated according to the size and offset of the projected image frame and the number of pixels in the modulation area.
5. The projection method according to claim 2, wherein the shift amount of the projection image picture on the projection screen is converted into an offset pixel amount of a modulated image in a light modulation device, or is converted into a lens The optical axis of the device is offset from the central axis axis of the projection image screen, and according to the offset pixel amount of the modulated image or the optical axis from the central axis axis of the projection image screen, Correcting the projection position of the projection image screen includes:

   Converting the offset of the projection image picture on the projection screen into an offset of the optical axis of the lens device from the central axis of the projection image picture;

   The optical axis of the lens device is driven to move in the direction of the central axis of the projection image screen according to the shift amount of the optical axis from the central axis of the projection image screen.
6. The projection method according to claim 5, wherein:

   The conversion of the offset of the projection image picture on the projection screen into an offset of the optical axis of the lens device from the central axis of the projection image picture includes:

   Calculate the magnification of the lens device according to the pixel interval of the light modulation device, the number of pixels used to modulate the image, and the size of the projected image screen;

   According to the shift amount of the projection image screen on the projection screen and the magnification of the lens device, the shift amount of the optical axis offset from the central axis of the projection image screen is calculated.
7. The projection method according to any one of claims 1-6, wherein

   The calculating the offset direction and amount of the projection image screen on the projection screen based on the acquired projection image screen and the measured projection distance includes:

   An offset of the projection image picture on the projection screen is calculated according to a distance between adjacent photosensitive units in the image acquisition device, a magnification ratio, and a distance between the detected projection image picture and a frame of the projection screen.
8. The projection method according to claim 7, wherein:

   Calculating the offset of the projection image screen on the projection screen according to the distance between adjacent photosensitive units in the image acquisition device, the magnification ratio, and the distance between the detected projection screen and the frame of the projection screen includes:

   The magnification of the image acquisition device is calculated according to the distance between the image acquisition device and the projection screen and the optical parameters of the image acquisition device.
9. The projection method according to claim 1, wherein the offset direction and amount of the projection image screen on the projection screen are calculated according to the acquired projection image screen and the measured projection distance, Before correcting the projection position of the projection image frame according to the offset direction and the offset amount, the method further includes:

   A projection image screen projected onto the projection screen is collected by an image acquisition device, and whether the projection image screen is shifted is determined based on a position of a frame of the projection screen.
10. A projection device, comprising a housing, a lens device provided on a surface of the housing, an image acquisition device, a distance sensor, and a control device and a light modulation device provided inside the housing;

    The control device is configured to control the distance sensor to measure a projection distance;

    The control device is further configured to control the light modulation device to modulate light and emit image light, and the image light passes through the lens device and is irradiated to a projection screen to form a projection image screen;

    The control device and the control device are used to control the image acquisition device to collect a projection image frame, and calculate an offset direction and an offset of the projection image frame on the projection screen according to the acquired projection image frame and the measured projection distance. To correct the projection position of the projected image frame.
11. The projection device according to claim 10, wherein the control means is configured to convert an offset amount of the projection image screen on the projection screen into an offset pixel of the modulated image in the light modulation device Amount, or converted into an offset amount where the optical axis of the lens device is offset from the central axis axis of the projected image screen, and the projected image screen is shifted according to the offset pixel amount of the modulated image or the optical axis. The offset of the central axis is used to correct the projection position of the projection image screen.
12. The projection device according to claim 11, wherein the control device converts an offset amount of the projection image screen on the projection screen into an offset pixel amount of the modulated image in the light modulation device And performing compression processing on the modulation image according to the offset pixel amount of the modulation image, and then controlling the compression-processed modulation image in a modulation region of the light modulation device in an opposite direction to the projection image screen offset direction Move in the direction.
13. The projection device according to claim 11, further comprising a driving device; the control device converts an offset of the projection image screen on the projection screen into an optical axis deviation of the lens device Shifting the shift amount of the central axis of the projection image screen, and driving the lens device toward the projected image by the driving device according to the shift amount of shifting the central axis of the projection image screen from the central axis of the projection image screen The center axis of the screen moves in the direction of the axis.
14. A computer-readable storage medium in which a computer program is stored, characterized in that when the computer program is executed, the projection method according to any one of claims 1-9 is implemented.

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