CN110876046A - Projection method, projection apparatus, and computer-readable storage medium - Google Patents
Projection method, projection apparatus, and computer-readable storage medium Download PDFInfo
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- CN110876046A CN110876046A CN201811015616.0A CN201811015616A CN110876046A CN 110876046 A CN110876046 A CN 110876046A CN 201811015616 A CN201811015616 A CN 201811015616A CN 110876046 A CN110876046 A CN 110876046A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
Abstract
The invention provides a projection method, projection equipment and a computer readable storage medium, wherein the projection method comprises the following steps: calculating the offset direction and the offset of the projected image on a projection screen according to the collected projected image and the measured projection distance, and correcting the projection position of the projected image according to the offset direction and the offset. The projection equipment adopts the projection method, manual regulation is not needed, multiple comparison regulation is not needed, the use is convenient, and the improvement of user experience is facilitated.
Description
Technical Field
The present invention relates to the field of projection technologies, and in particular, to a projection method, a projection device, and a computer-readable storage medium.
Background
This section is intended to provide a background or context to the specific embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The projector is used in various meetings and teaching in daily life, and plays a role in lifting the people's life. In a daily household application scene, a lens of a projector is heated in a working process, so that a picture of the lens, which is emitted to a screen, generates a certain degree of offset, and when a screen with a specific size is used, the watching experience of a client is influenced by a large offset. In addition, the projection image of the projector will change due to the lapse of time during the use process, thereby affecting the projection effect.
In the prior art, the projector needs to manually adjust the projection direction and angle of the projector step by a user or through a remote controller, and a scheme for quickly and effectively correcting the position of a picture projected by the projector is lacked, which is not beneficial to improving user experience.
Disclosure of Invention
In order to solve the technical problem that a projector in the prior art cannot automatically correct a projected image, the invention provides a projection method capable of automatically adjusting the position of the projected image, and also provides projection equipment and a computer readable storage medium.
A method of projection comprising the steps of:
calculating the offset direction and the offset of the projected image on a projection screen according to the collected projected image and the measured projection distance, and correcting the projection position of the projected image according to the offset direction and the offset.
A projection device comprises a shell, a lens device arranged on the surface of the shell, an image acquisition device, a distance sensor, a control device and a light modulation device arranged in the shell;
wherein the control device is used for controlling the distance sensor to measure the projection distance;
the control device is also used for controlling the light modulation device to modulate light and emit image light, and the image light penetrates through the lens device and irradiates to a projection screen to form a projection image;
the control device is used for controlling the image acquisition device to acquire a projection image picture, and calculating the offset direction and the offset of the projection image picture on the projection screen according to the acquired projection image picture and the measured projection distance so as to correct the projection position of the projection image picture.
A computer-readable storage medium, in which a computer program is stored which, when executed, implements a projection method as described above.
The projection equipment provided by the invention adopts the projection method, calculates the offset direction and the offset of the projection image in the image coordinate system according to the collected projection image and the measured projection distance, and realizes the correction of the projection image according to the offset direction and the offset. The projection equipment provided by the invention adopts the projection method, does not need manual regulation and multiple comparison regulation, is convenient to use, and is beneficial to improving the user experience.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments/modes of the present invention, the drawings needed to be used in the description of the embodiments/modes are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments/modes of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a projection apparatus according to a first embodiment of the present invention.
Fig. 2 is a flowchart of a projection method adopted by the projection apparatus shown in fig. 1.
Fig. 3 is a schematic structural diagram of a projection apparatus according to a second embodiment of the present invention.
Fig. 4 is a flowchart of a projection method adopted by the projection apparatus shown in fig. 3.
Description of the main elements
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The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, 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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention provides a projection method and projection equipment, wherein the projection equipment is applied to the projection method, manual regulation is not needed, multiple comparison regulation is not needed, and automatic projection image picture correction can be conveniently realized by using a projector.
Fig. 1 is a schematic structural diagram of a projection apparatus 100 according to a first embodiment of the present invention. The projection apparatus 100 includes a housing 110, a lens device 120 disposed on a surface of the housing, an image capturing device 130, a distance sensor 140, and a control device (not shown) and a light modulation device (not shown) disposed inside the housing 110. The control device is used for controlling the light modulation device to modulate light and emit image light, and the image light passes through the lens device 120 and irradiates to a screen to form a projection image; the control device is also used for controlling the image acquisition device 130 to acquire a projection image picture, controlling the distance sensor 140 to measure the projection distance, and performing image correction by adopting the projection method provided by the invention.
Specifically, the light modulation Device is one of an LCD (Liquid Crystal Display), an LCOS (Liquid Crystal on Silicon, also called Liquid Crystal on Silicon), and a DMD (Digital Micromirror Device). Generally, the projection apparatus 100 further includes a light source device (not shown) configured to emit light to the light modulation device, where the light modulation device includes a modulation region for performing light modulation, the modulation region is provided with a plurality of pixels arranged in an array for modulating light, and the modulation region is configured to modulate incident light and emit the image light. The light emitted from the modulation region passes through the lens device 120 to form a projection image 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 reflector group, a first lens group and a second lens group with positive diopter. The second lens group has a positive diopter and is arranged on one side of the first lens group far away from the light modulation device, and the second lens group comprises a plurality of lenses. When the image light emitted from 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 pass through the optical axis of the second lens group, and a field angle generated by the second lens group is smaller than 100 degrees. The reflector group has negative reflection diopter and is positioned on one side of the second lens group far away from the first lens group, and the reflector has a reflection curved surface for reflecting the image light passing through the second lens group. The lens device 120 provides the function of the wide-angle lens group through the first lens group, the second lens group and the reflector group, so that the overall size of the lens device 120 can be reduced and the production cost can be reduced on the premise of maintaining good imaging quality.
The image acquisition device 130 comprises a circuit board, an image sensor, an optical filter and a lens assembly, wherein the image sensor is mounted in the middle of the circuit board, the circuit board at the periphery of the image sensor is provided with a passive element and a gold thread for connecting the image sensor and the passive element, a circle of annular retaining edge for surrounding a photosensitive area of the image sensor is formed on a non-photosensitive area of the image sensor, a plastic package body for coating the passive element and the gold thread is formed on the image sensor and the circuit board outside the annular retaining edge through plastic package materials, a sinking groove is formed in the middle of the upper side of the plastic package body, and the periphery of the optical filter is mounted in the sinking groove; the lens assembly is mounted on the upper side of the plastic package body. The image acquisition device 130 is a light filter direct-attachment type miniaturized image acquisition device, and an annular flange is formed by dispensing and drying glue around a non-photosensitive area at the periphery of the image sensor, so that plastic packaging materials can be prevented from entering the photosensitive area of the image sensor during molding, and a mold can be prevented from pressing the photosensitive area of the image sensor during molding; the plastic package body formed by the plastic package material is used for casting the non-photosensitive area of the image sensor, the passive elements and the gold wires on the periphery together to form an integral structure, and compared with the combination of a traditional support and a circuit board, the integral structure reduces the occupied space of the support, thereby achieving the purpose of reducing the size of the camera module and enhancing the reliability of products.
The distance sensor 140 includes one of an infrared distance measuring device or a laser distance measuring device. In one embodiment, the distance sensor 140 measures the projection distance by using a phase method, i.e., the distance sensor 140 performs amplitude modulation on the emitted light and measures the generated phase delay of the emitted light going back and forth once, and then converts the distance represented by the phase delay according to the wavelength of the emitted light. In one embodiment, the distance sensor 140 measures the first distance by using a pulse method, i.e., the distance sensor 140 reflects the emitted light to the projection screen and then receives the light by the distance sensor 140, and the distance sensor 140 records the round trip time of the light. And converting the distance measurement result corresponding to the projection distance according to the wavelength of the emergent light. In addition, the distance sensor 140 may include a distance measuring sensor and a processor, and the processor processes an output signal of the distance measuring sensor to obtain the projection distance. In another embodiment, the distance sensor 140 comprises a distance measuring sensor, and the control device in the projection apparatus 100 processes the output signal of the distance measuring sensor to obtain the projection distance.
Further, the control device in the projection apparatus 100 may be a single chip, a Central Processing Unit (CPU), or other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
Referring to fig. 2, a flowchart of a projection method adopted by the projection apparatus 100 shown in fig. 1 is shown. The projection method in the invention calculates the offset direction and offset of the projection image on the projection screen according to the collected projection image and the measured projection distance, and corrects the projection position of the projection image according to the offset direction and the offset. Further, the offset of the projected image on the projection screen is converted into the offset pixel amount of the modulated image in the light modulation device, or converted into the offset of the optical axis of the lens device 120 offset from the central axis of the projected image, and the projection position of the projected image is corrected according to the offset pixel amount of the modulated image or the offset of the optical axis offset from the central axis of the projected image. Correspondingly, the control device is used for converting the offset of the projected image on the projection screen into the offset pixel quantity of the modulated image in the light modulation device or converting the offset into the offset of the optical axis of the lens device 120 offsetting the central axis of the projected image, and correcting the projection position of the projected image according to the offset pixel quantity of the modulated image or the offset of the optical axis offsetting the central axis of the projected image.
In this embodiment, the control device is used to implement the projection method, and the method includes the steps of:
s101: and calculating the offset direction and the offset of the projected image on the projection screen according to the acquired projected image and the measured projection distance.
Before step S101, a projection image projected onto the projection screen may be acquired by the image acquisition device 130, and whether the projection image has a deviation may be determined based on a frame position of the projection screen. If the deviation exists, executing step S101, and if the deviation does not exist, determining whether the next frame of the acquired projection image picture has the deviation according to the instruction.
In the embodiment of the present invention, the image acquisition device 130 is configured to acquire the projection image, the distance sensor 140 is configured to measure the projection distance, and the control device is configured to calculate a shift direction and a shift amount of the projection image on the projection screen according to the acquired projection image and the measured projection distance.
In a preferred embodiment, the image capturing 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 being understood that the image capturing device 130 and the distance sensor 140 may be disposed adjacent to each other, or disposed at other positions 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 an area inside the frame is X × Y, and ideally, the size of the projection image in the projection screen is X × Y and is a unit of length, such as mm or cm. It will be appreciated that in other embodiments, the size of the area within the frame may be greater than X Y, with a space between the projected image frame and the frame.
According to the distance △ P between adjacent photosensitive units in the image acquisition device 130, the magnification β and the distance β 0P and △ Q between the detected projection image and the frame of the projection screen, the offset △ x of the projection image on the projection screen and the △ y. image acquisition device 130 comprise a plurality of photosensitive units arranged in an array, each photosensitive unit is used for converting an incident light signal into a corresponding electric signal, the distance between the adjacent photosensitive units is △ P, the offset pixel quantity of the projection image detected by the image acquisition device 130 is △ P △ Q, and the image acquisition device 130 comprises pixel units, △ P and △ Q refer to the distance between the detected projection image and the frame of the projection screen in the projection image acquired by the control device,
△x＝△P*△p*β；
△y＝△Q*△p*β。
in this embodiment, the projection distance is the measured distance L between the image capturing device 130 and the projection screen, the focal length of the image capturing device 130 is f, the optical length of the lens assembly is d, the front focal length is f1, and the back focal length is f2, and all the above parameters are known quantities, so that the image magnification β of the image capturing device 130 can be calculated:
A＝L-d-f1-f2。
according to the above formulas, the offset amounts △ x and △ y of the projection image on the projection screen are calculated according to the collected projection image and the measured projection distance L, and further according to the distance △ P between the adjacent photosensitive units of the image collecting device 130 in the projection apparatus 100, the magnification ratio β, and the detected distances △ P and △ Q between the projection image and the frame of the projection screen.
The amounts △ x, △ y of shift of the projected image picture on the projection screen are converted into amounts △ S, △ T of shift pixels of a modulated image in the light modulation device S102.
Specifically, the amount of shifted pixels △ S, △ T of the modulation image is calculated according to the size X, Y and the amounts of shift △ x, △ y of the projection image picture, and the number M × N of pixels in the modulation region, as shown in the following formula:
s103: the modulation image is compressed according to the offset pixel amount of the modulation image, and then the compressed modulation image is controlled to move in a direction opposite to the projection image screen offset direction in the modulation region of the light modulation device.
The image light emitted from the modulated region after the movement passes through the lens device 120 to be imaged on the projection screen, and the projected image completely falls into the region surrounded by the frame of the projection screen.
The projection apparatus 100 provided in the embodiment of the present invention uses the projection method to calculate the offset direction and the offset amount of the projection image on the projection screen according to the collected projection image and the measured projection distance, and calculate the offset pixel amount of the modulation image in the corresponding light modulation device according to the offset direction and the offset amount, thereby implementing the correction of the projection position of the projection image. The projection device 100 does not need manual adjustment and multiple comparison adjustment, and is convenient to use and beneficial to improving user experience.
Fig. 3 is a schematic structural diagram of a projection apparatus 200 according to a second embodiment of the present invention. The projection apparatus 200 according to the embodiment of the present invention is different from the projection apparatus 100 mainly in that the projection apparatus 200 further includes a driving device 250 connected between the lens device 220 and the control device. The control device sends out a control signal according to the offset of the optical axis of the lens device 200 from the central axis of the projected image picture, and the driving device 250 drives the optical axis of the lens device 220 to move in the direction exceeding the central axis of the projected image picture according to the control signal. It should be noted that, within the scope of the spirit or the basic features of the present invention, each specific solution applicable to the first embodiment may also be correspondingly applicable to the second embodiment, and for the sake of brevity and avoidance of repetition, the detailed description thereof is omitted here.
Referring to the projection method in the present embodiment, similar to the first embodiment, the projection position of the projection image is corrected according to the offset direction and the offset of the projection image on the projection screen.
Referring to fig. 4, a flowchart of a projection method adopted by the projection apparatus 200 shown in fig. 3 is shown. The projection method in the present invention includes converting the shift amount of the projected image on the projection screen into the shift pixel amount of the modulation image in the light modulation device, or converting the shift amount of the optical axis of the lens device 220 to shift the central axis of the projected image, and correcting the projection position of the projected image according to the shift pixel amount of the modulation image or the shift amount of the optical axis to shift the central axis of the projected image. Correspondingly, the control device is used for converting the offset of the projected image on the projection screen into the offset pixel quantity of the modulation image in the light modulation device or converting the offset into the offset of the optical axis of the lens device 220 offsetting the central axis of the projected image, and correcting the projection position of the projected image according to the offset pixel quantity of the modulation image or the offset of the optical axis offsetting the central axis of the projected image.
In this embodiment, the projection method includes:
s201, calculating the deviation direction and the deviation amount △ x of the projection image on the projection screen according to the acquired projection image and the measured projection distance, wherein the step S201 is the same as the step S101, and the description is omitted here.
S202, the offset amounts △ x, △ y of the projection image picture on the projection screen are converted into offset amounts △ u, △ v of the optical axis of the lens device 220 offset from the central axis of the projection image picture.
The magnification y of the lens device 220 is calculated based on the pixel spacing △ q of the light modulation device, the number of pixels M x N used to modulate the image, and the size X, Y of the projected image picture,
γ＝X/(△q*M)。
calculating the offset △ u, △ v of the optical axis offset from the central axis of the projection image according to the offset △ x, △ y of the projection image on the projection screen and the magnification gamma of the lens device 220:
△u＝△x/γ
△v＝△y/γ。
s203: the optical axis of the lens device 220 is driven to move toward the direction of the central axis of the projected image picture according to the offset of the optical axis from the central axis of the projected image picture.
In one embodiment, the control device calculates a shift amount by which the optical axis is shifted from the axis of the center axis of the projection image screen, and outputs a pulse signal corresponding to the shift amount by which the optical axis is shifted from the axis of the center axis of the projection image screen.
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, and the stepping motor receives the driving signal to drive the lens device 220 to move. The moved lens device 220 is imaged on the projection screen, and the projected image completely falls into an area surrounded by the frame of the projection screen.
In this embodiment, the projection device 200 uses the projection method described above to calculate the offset direction and the offset of the projection image on the projection screen according to the collected projection image and the measured projection distance, and calculate the offset of the optical axis of the lens device 220 from the central axis of the projection image according to the offset of the projection image on the projection screen, so as to correct the projection position of the projection image. The projection equipment 200 does not need manual regulation and multiple comparison regulation by adopting the projection method, is convenient to use and is beneficial to improving the user experience.
The reference numerals S101 to S103 and S201 to S203 in the above steps are not used to limit the sequence of the steps, the sequence of the steps may be interchanged, and other steps may be added or corresponding steps may be deleted between the above steps.
The invention also provides a computer-readable storage medium, in which a computer program is stored which, when executed, implements a projection method as described above.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several of the means recited in the apparatus claims may also be embodied by one and the same means or system in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (14)
1. A method of projection comprising the steps of:
calculating the offset direction and the offset of the projected image on a projection screen according to the collected projected image and the measured projection distance, and correcting the projection position of the projected image according to the offset direction and the offset.
2. The projection method of claim 1, wherein the calculating a shift direction and a shift amount of the projection image on a projection screen according to the acquired projection image and the measured projection distance, and the correcting the projection position of the projection image according to the shift direction and the shift amount comprises:
and converting the offset of the projected image on the projection screen into the offset pixel quantity of a modulated image in a light modulation device, or converting the offset into the offset of the optical axis offset of a lens device on the central axis of the projected image, and correcting the projection position of the projected image according to the offset pixel quantity of the modulated image or the offset of the optical axis offset on the central axis of the projected image.
3. The projection method according to claim 2, wherein the converting of the shift amount of the projected image on the projection screen into a shift pixel amount of a modulation image in a light modulation device or into a shift amount of an optical axis of a lens device shifted from a central axis of the projected image, and the correcting of the projection position of the projected image according to the shift pixel amount of the modulation image or the shift amount of the optical axis shifted from the central axis of the projected image comprises:
converting an offset amount of the projected image picture on the projection screen into an offset pixel amount of a modulated image in the light modulation device;
the modulation image is compressed according to the offset pixel amount of the modulation image, and then the compressed modulation image is controlled to move in a direction opposite to the projection image screen offset direction in the modulation region of the light modulation device.
4. The projection method of claim 3,
the converting an offset amount of the projected image picture on the projection screen into an offset pixel amount of a modulation image in a light modulation device includes:
and calculating the offset pixel quantity of the modulation image according to the size and the offset of the projection image picture and the number of pixels in the modulation area.
5. The projection method according to claim 2, wherein the converting of the shift amount of the projected image on the projection screen into a shift pixel amount of a modulation image in a light modulation device or into a shift amount of an optical axis of a lens device shifted from a central axis of the projected image, and the correcting of the projection position of the projected image according to the shift pixel amount of the modulation image or the shift amount of the optical axis shifted from the central axis of the projected image comprises:
converting the offset of the projected image on the projection screen into the offset of the optical axis of the lens device offsetting the central axis of the projected image;
and driving the optical axis of the lens device to move towards the axis direction of the central axis of the projected image picture according to the offset of the optical axis from the axis of the central axis of the projected image picture.
6. The projection method of claim 5,
converting the offset of the projected image on the projection screen into the offset of the optical axis of the lens device from the central axis of the projected image comprises:
calculating the magnification of the lens device according to the pixel interval of the light modulation device, the number of pixels used for modulating an image and the size of the image of the projected image;
and calculating the offset of the optical axis from the axis of the central shaft of the projected image picture according to the offset of the projected image picture on the projection screen and the magnification of the lens device.
7. The projection method according to any of claims 1 to 6,
the calculating the offset direction and the offset of the projection image on the projection screen according to the collected projection image and the measured projection distance comprises the following steps:
and calculating the offset of the projected image on the projection screen according to the distance between adjacent photosensitive units in the image acquisition device, the magnification and the distance between the detected projected image and the frame of the projection screen.
8. The projection method of claim 7,
the step of calculating the offset of the projection image on the projection screen according to the distance between adjacent photosensitive units in the image acquisition device, the magnification and the detected distance between the projection image and the frame of the projection screen comprises:
and calculating the magnification of the image acquisition device 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 before the calculating of the offset direction and the offset of the projection image on the projection screen based on the acquired projection image and the measured projection distance and the correcting of the projection position of the projection image based on the offset direction and the offset further comprises:
the method comprises the steps of collecting a projection image projected to a projection screen through an image collecting device, and judging whether the projection image has offset or not based on the frame position of the projection screen.
10. A projection device is characterized by comprising a shell, a lens device arranged on the surface of the shell, an image acquisition device, a distance sensor, a control device and a light modulation device which are arranged in the shell;
wherein the control device is used for controlling the distance sensor to measure the projection distance;
the control device is also used for controlling the light modulation device to modulate light and emit image light, and the image light penetrates through the lens device and irradiates to a projection screen to form a projection image;
the control device is used for controlling the image acquisition device to acquire a projection image picture, and calculating the offset direction and the offset of the projection image picture on the projection screen according to the acquired projection image picture and the measured projection distance so as to correct the projection position of the projection image picture.
11. The projection apparatus according to claim 10, wherein the control means is adapted to convert an amount of shift of the projected image picture on the projection screen into an amount of shift pixels of a modulation image in the light modulation means or into an amount of shift of an optical axis of the lens means from a central axis of the projected image picture, and to correct the projection position of the projected image picture based on the amount of shift pixels of the modulation image or the amount of shift of the optical axis from the central axis of the projected image picture.
12. The projection apparatus according to claim 11, wherein the control means converts an amount of shift of the projection image screen on the projection screen into an amount of shift pixels of a modulation image in the light modulation means, and performs compression processing on the modulation image in accordance with the amount of shift pixels of the modulation image, and then controls the compression-processed modulation image to move in a direction opposite to a direction of shift of the projection image screen in a modulation region of the light modulation means.
13. The projection device of claim 11, further comprising a drive mechanism; the control device converts the offset of the projected image on the projection screen into the offset of the optical axis of the lens device offsetting the central axis of the projected image, and drives the lens device to move towards the direction of the central axis of the projected image through the driving device according to the offset of the optical axis offsetting the central axis of the projected image.
14. A computer-readable storage medium, in which a computer program is stored which, when being executed, carries out the projection method according to any one of claims 1 to 9.
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| CN201811015616.0A CN110876046A (en) | 2018-08-31 | 2018-08-31 | Projection method, projection apparatus, and computer-readable storage medium |
| PCT/CN2019/076639 WO2020042568A1 (en) | 2018-08-31 | 2019-03-01 | Projection method, projection device, and computer readable storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114155617A (en) * | 2021-11-22 | 2022-03-08 | 支付宝(杭州)信息技术有限公司 | Parking payment method and collection equipment |
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| CN114339169B (en) * | 2020-09-30 | 2023-10-27 | 青岛海信激光显示股份有限公司 | Correction method, device and equipment for projection image |
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| WO2020042568A1 (en) | 2020-03-05 |
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