CN110913191A - Trapezoidal correction system and trapezoidal correction method - Google Patents
Trapezoidal correction system and trapezoidal correction method Download PDFInfo
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- CN110913191A CN110913191A CN201911318488.1A CN201911318488A CN110913191A CN 110913191 A CN110913191 A CN 110913191A CN 201911318488 A CN201911318488 A CN 201911318488A CN 110913191 A CN110913191 A CN 110913191A
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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 present application provides a keystone correction system comprising: a projection device for projecting a projection picture; the positioning paste is arranged on the target plane and used for forming an adjustable target area with a quadrilateral shape; the camera is used for acquiring a target image comprising an adjustable target area; and the processor is used for carrying out image processing on the target image to obtain the position information of the adjustable target area and adjusting the projection picture according to the position information and the current projection position information, wherein the current projection position information is the position information of the projection picture. The positioning patch is low in cost, and the position of the adjustable target area can be adjusted according to the user requirement. The application also provides a trapezoidal correction method, which has the beneficial effects.
Description
Technical Field
The present disclosure relates to projector technologies, and in particular, to a trapezoidal correction system and a trapezoidal correction method.
Background
When projection is performed by using a projection device, in order to ensure the viewing effect, trapezoidal correction is required in a use scene such as side projection, that is, a picture is corrected into a rectangular picture which is just opposite to a viewer. The related art mainly includes two ways, one is to correct the picture into the projection curtain, and the other is to determine a suitable projection area on the wall surface based on the sensing device. The cost is higher and the flexibility is low for the two modes.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The purpose of the present application is to provide a trapezoidal correction system and a trapezoidal correction method, which are low in cost and high in flexibility. The specific scheme is as follows:
the present application provides a keystone correction system comprising:
a projection device for projecting a projection picture;
the positioning paste is arranged on the target plane and used for forming an adjustable target area with a quadrilateral shape;
the camera is used for acquiring a target image comprising the adjustable target area;
and the processor is used for carrying out image processing on the target image to obtain the position information of the adjustable target area and adjusting the projection picture according to the position information and the current projection position information, wherein the current projection position information is the position information of the projection picture.
Optionally, a positioning pattern is arranged on the surface of the positioning sticker, wherein the positioning pattern includes any one of a two-dimensional code, an aruco code, a line segment, and a geometric figure.
Optionally, the positioning paste includes a paste layer, and the positioning paste is fixed on the target plane through the paste layer.
Optionally, the viscosity of the adhesive layer is greater than 2500 cp.
Optionally, the camera is an ultra-wide angle camera.
The application provides a trapezoidal correction method, which comprises the following steps:
acquiring a target image corresponding to an adjustable target area formed by positioning stickers arranged on a target plane, wherein the shape of the adjustable target area is quadrilateral;
performing image processing on the target image to obtain position information of the adjustable target area;
and adjusting the projection picture according to the position information and the current projection position information, wherein the current projection position information is the position information of the projection picture.
Optionally, the image processing the target image to obtain the position information of the adjustable target area includes:
performing image difference processing on the comparison image and the target image to obtain the position information of the adjustable target area,
wherein the contrast image is an image when the positioning patch is not arranged on the target plane.
Optionally, before adjusting the projection picture according to the position information and the current projection position information, the method further includes:
acquiring a full black image and a full white image, wherein the full black image is obtained by projecting a full black image on the target plane, and the full white image is obtained by projecting a full white image on the target plane;
and performing difference on the full black image and the full white image to obtain the current projection position information.
Optionally, before adjusting the projection picture according to the position information and the current projection position information, the method further includes:
acquiring a characteristic image, wherein the characteristic image is an image obtained by projecting a picture comprising a characteristic image on the target plane;
and determining the current projection position information according to the characteristic image.
Optionally, the adjusting the projection picture according to the position information and the current projection position information, where the current projection position information is the position information of the projection picture, includes:
determining target projection position information of a target projection area according to the position information;
and adjusting the projection picture according to the target projection position information so as to enable the adjusted projection picture to be overlapped with a target projection area.
The present application provides a keystone correction system comprising: a projection device for projecting a projection picture; the positioning paste is arranged on the target plane and used for forming an adjustable target area with a quadrilateral shape; the camera is used for acquiring a target image comprising an adjustable target area; and the processor is used for carrying out image processing on the target image to obtain the position information of the adjustable target area and adjusting the projection picture according to the position information and the current projection position information, wherein the current projection position information is the position information of the projection picture.
Therefore, the trapezoidal correction system provided by the application forms the adjustable target area with a quadrilateral shape by using the positioning paste arranged on the target plane, the target image comprising the adjustable target area is collected by the camera, the target image is subjected to image processing to obtain the position information of the adjustable target area, and finally the projection picture is adjusted based on the position information and the current projection position information.
The application also provides a trapezoidal correction method, which has the beneficial effects and is not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a keystone correction system according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating region division of a projection picture according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of the adjusted region division provided in the embodiment of the present application;
FIG. 4 is a schematic structural diagram of a keystone correction system according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an adjustable projection area and a target projection area according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of another adjustable projection area and a target projection area according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. 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 application.
When projection is performed by using a projection device, in order to ensure the viewing effect, trapezoidal correction is required in a use scene such as side projection, that is, a picture is corrected into a rectangular picture which is just opposite to a viewer. The related art mainly includes two ways, one is to correct the picture into the projection curtain, and the other is to determine a suitable projection area on the wall surface based on the sensing device. The cost is higher and the flexibility is low for the two modes. Based on the above technical problem, the present embodiment provides a trapezoidal correction system, specifically please refer to fig. 1, where fig. 1 is a schematic structural diagram of a trapezoidal correction system provided in the present embodiment, and specifically includes:
a projection device 10 for projecting a projection picture;
a positioning sticker 20 arranged on the target plane and used for forming an adjustable target area with a quadrilateral shape;
a camera 30 for acquiring a target image including an adjustable target area;
and the processor 40 is configured to perform image processing on the target image to obtain position information of the adjustable target area, and adjust the projection picture according to the position information and current projection position information, where the current projection position information is position information of the projection picture.
For the projection device 10, the model and specific operating parameters of the projection device 10 are not limited by the user, and the user can customize the setting. The projection device 10 mainly projects a projection picture by a user, wherein the projection picture can be any picture such as a chessboard, a two-dimensional code, a rectangle, and the like. The projection device 10 is connected to the processor 40, but the connection manner of the two is not limited in this embodiment, and the connection may be a wired connection or a wireless connection as long as the information interaction between the two can be realized.
Further to the embodiment of the positioning sticker 20, the positioning sticker 20 is disposed on a target plane, and the target plane may be any wall surface or glass surface. The positioning sticker 20 is mainly used for forming a quadrangle, and the quadrangle is taken as an adjustable target area. It can be understood that, the determining of the adjustable target area by the location sticker provided in this embodiment may be that, when the user needs to project in the first area, a location sticker corresponding to the first area is set on the target plane; when a user needs to project in the second area, a positioning sticker corresponding to the second area is arranged on the target plane; after the user sets the positioning sticker corresponding to the third area on the target plane, when the area is found to be too small after projection, in an implementable embodiment, the position information of the fourth area larger than the third area can be directly determined according to the third area, and the trapezoidal correction is directly performed. The number of the positioning patches 20 can be 4, including a first positioning patch 20-1, a second positioning patch 20-2, a third positioning patch 20-3 and a fourth positioning patch 20-4.
In this embodiment, the size and material of the positioning patch 20 are not limited, as long as there are identifiable characteristic points. The embodiment does not limit the specific adhering manner of the positioning sticker 20 to the target plane, and in an implementation manner, the positioning sticker 20 is adhered to the target plane by using an adhesive, where the adhesive may be glue, glue dots, glue bars, epoxy resin, or the like; in another practical implementation, when the thickness of the target plane is within a preset range, the positioning patch 20 may be a magnet, and a magnet is disposed on the other side of the target plane corresponding to the positioning patch 20 to fix the positioning patch 20 through magnetic attraction; in another practical implementation, the positioning patch 20 includes an adhesive layer, and the positioning patch 20 is fixed on the target plane by the adhesive layer, and the viscosity of the adhesive layer is greater than 2500cp, so that the positioning patch 20 can be repeatedly used and repeatedly attached to the corresponding target plane.
It can be understood that the positioning sticker 20 can be moved, and the user can more conveniently change the position of the positioning sticker 20 to achieve the effect of the trapezoidal correction; in an implementation, the adjustment of the projection picture may be performed according to the adjustable target area determined by the positioning sticker 20, so that the adjusted projection picture coincides with the adjustable target area; in another implementation, when the adjustable target area to be determined is larger, the target projection area required by the final projection can be determined according to the adjustable target area determined by the positioning sticker; and adjusting the projection picture according to the target projection area so that the adjusted projection picture is overlapped with the target projection area.
Further, the surface of the positioning sticker 20 is provided with a positioning pattern, wherein the positioning pattern includes any one of a two-dimensional code, an aruco code, a line segment, and a geometric figure.
Taking an adjustable target area, i.e. a final projection area, as an example, please refer to fig. 2 and 3 for a specific adjustment process, and fig. 2 is a schematic diagram of area division of a projection image provided in the embodiment of the present application; fig. 3 is a schematic diagram of the adjusted region division according to the embodiment of the present application. A is a target image, B is a projection picture, and C is an adjusted projection picture.
The camera 30 may be a general camera, a super wide angle camera, etc., which the user may select by himself. The trapezoidal correction system is a projector, including but not limited to a short-focus projector or a long-focus projector, wherein the short-focus projector may be a laser television.
The present embodiment further describes the processor 40, and the processor 40 may be configured to perform image processing on the target image, obtain position information of the adjustable target area, and adjust the projection picture according to the position information and the current projection position information, where the current projection position information is the position information of the projection picture.
In some implementable embodiments, processor 40 may further implement the following steps: and performing image difference processing on a comparison image and the target image to obtain the position information of the adjustable target area, wherein the comparison image is an image when the positioning sticker 20 is not arranged on the target plane.
In some implementable embodiments, processor 40 may further implement the following steps: acquiring a full black image and a full white image, wherein the full black image is obtained by projecting a full black image on the target plane, and the full white image is obtained by projecting a full white image on the target plane; and performing difference on the full black image and the full white image to obtain the current projection position information.
In some implementable embodiments, processor 40 may further implement the following steps: acquiring a characteristic image, wherein the characteristic image is an image obtained by projecting a picture comprising a characteristic image on the target plane; and determining the current projection position information according to the characteristic image.
In some implementable embodiments, processor 40 may further implement the following steps: determining target projection position information of a target projection area according to the position information; and adjusting the projection picture according to the target projection position information so as to enable the adjusted projection picture to be overlapped with a target projection area. At this moment, a small adjustable target area is set through the positioning sticker 20, and a projection picture is projected to a large range based on a large range of small-range mapping, so that different actual requirements of a user can be met while the cost is low, and the practicability is higher.
Based on the above technical solution, in the trapezoidal correction system provided in this embodiment, a positioning patch disposed on a target plane is used to form an adjustable target area with a quadrilateral shape, a target image including the adjustable target area is collected by a camera, and the target image is subjected to image processing to obtain position information of the adjustable target area, and finally a projection picture is adjusted based on the position information and current projection position information.
When projection is performed by using a projection device, in order to ensure the viewing effect, trapezoidal correction is required in a use scene such as side projection, that is, a picture is corrected into a rectangular picture which is just opposite to a viewer. The related art mainly includes two ways, one is to correct the picture into the projection curtain, and the other is to determine a suitable projection area on the wall surface based on the sensing device. The cost is higher and the flexibility is low for the two modes. Based on the above technical problem, the present embodiment provides a trapezoidal correction method, specifically referring to fig. 4, where fig. 4 is a schematic structural diagram of a trapezoidal correction system provided in the present embodiment, and the method specifically includes:
s110, acquiring a target image corresponding to an adjustable target area formed by positioning stickers arranged on a target plane, wherein the shape of the adjustable target area is quadrilateral.
The target image includes a projection screen and screens other than the screen.
And S120, carrying out image processing on the target image to obtain the position information of the adjustable target area.
Optionally, the image processing the target image to obtain the position information of the adjustable target area includes: and performing image difference processing on the comparison image and the target image to obtain the position information of the adjustable target area, wherein the comparison image is the image when the positioning sticker is not arranged on the target plane.
Therefore, the position information of the adjustable target area is positioned through image difference processing, the method is simpler, and the calculated amount is small.
And S130, adjusting the projection picture according to the position information and the current projection position information, wherein the current projection position information is the position information of the projection picture.
In an implementation mode, the adjustable target area is the target projection area, and the projection picture is adjusted according to the position information and the current projection position information, so that the adjusted projection picture is overlapped with the adjustable target area. In another implementation, the adjustable target area is a small area, and a large target projection area is determined according to the adjustable target area, so that the adjusted projection picture coincides with the target projection area.
In an implementation manner, before adjusting the projection picture according to the position information and the current projection position information, the method further includes: acquiring a full black image and a full white image, wherein the full black image is obtained by projecting a full black image on a target plane, and the full white image is obtained by projecting a full white image on the target plane; and (4) performing difference on the full black image and the full white image to obtain the current projection position information.
When the full-black image is projected, the camera is used for collecting a full-black image comprising the full-black image and taking the full-black image as a background image, when the full-white image is projected, the camera is used for collecting a full-white image comprising the full-white image and taking the full-white image as a foreground image, and the background image and the foreground image are subjected to subtraction to obtain a projection position. Specifically, the foreground image and the background image are subjected to difference filtering according to a threshold value, and the projection position of the projection area in the image is obtained. The method is simple and the projection position acquisition precision is high.
In an implementation manner, before adjusting the projection picture according to the position information and the current projection position information, the method further includes: acquiring a characteristic image, wherein the characteristic image is an image obtained by projecting a picture comprising a characteristic image on a target plane; and determining the current projection position information according to the characteristic image.
The characteristic image is any one of a two-dimensional code, an aruco code, a line segment and a geometric figure. The feature points in the feature image can be more accurately obtained by obtaining the current projection position information according to the feature image, the phenomenon that the feature points are extracted wrongly due to the fact that the features are not obvious is avoided, and the accuracy of trapezoidal correction is improved.
Optionally, the adjusting the projection picture according to the position information and the current projection position information, where the current projection position information is the position information of the projection picture, includes: determining target projection position information of a target projection area according to the position information; and adjusting the projection picture according to the target projection position information so as to enable the adjusted projection picture to be overlapped with a target projection area.
At the moment, a small adjustable target area is set through the positioning paste, wherein the target projection position information is calculated according to the position information and the preset amplification ratio, the projection picture is projected to a large range based on the small-range mapping, the actual demands of the user on different can be met at the same time of low cost, and the practicability is higher. Fig. 5 is a schematic diagram of an adjustable projection area and a target projection area provided in the embodiment of the present application, where m1 is the target projection area, and n1 is the adjustable projection area, where a small-range mapping and a large-range mapping are implemented; fig. 6 is a schematic diagram of another adjustable projection area and a target projection area provided in this embodiment of the present application, where m2 is the target projection area, and n2 is the adjustable projection area, where a large-range mapping and a small-range mapping are implemented.
Based on the above technical solution, in the trapezoidal correction system provided in this embodiment, a positioning patch disposed on a target plane is used to form an adjustable target area with a quadrilateral shape, a target image including the adjustable target area is collected by a camera, and the target image is subjected to image processing to obtain position information of the adjustable target area, and finally a projection picture is adjusted based on the position information and current projection position information.
In the following, a trapezoidal correction apparatus provided by an embodiment of the present application is described, and the trapezoidal correction apparatus described below and the trapezoidal correction method described above may be referred to correspondingly, and includes:
the target image acquisition module is used for acquiring a target image corresponding to an adjustable target area formed by positioning stickers arranged on a target plane, wherein the shape of the adjustable target area is quadrilateral;
the position information acquisition module is used for carrying out image processing on the target image to obtain the position information of the adjustable target area;
and the adjusting module is used for adjusting the projection picture according to the position information and the current projection position information, wherein the current projection position information is the position information of the projection picture.
Preferably, the location information obtaining module includes:
a position information obtaining unit for performing image difference processing on the comparison image and the target image to obtain position information of the adjustable target area,
wherein, the contrast image is the image when the positioning paste is not arranged on the target plane.
Preferably, the method further comprises the following steps:
the image acquisition module is used for acquiring a full black image and a full white image, wherein the full black image is obtained by projecting a full black image on a target plane, and the full white image is obtained by projecting a full white image on the target plane;
and the first current projection position information obtaining module is used for performing difference on the full black image and the full white image to obtain current projection position information.
Preferably, the method further comprises the following steps:
the characteristic image acquisition module is used for acquiring a characteristic image, wherein the characteristic image is an image obtained by projecting a picture comprising a characteristic image on a target plane;
and the second current projection position information obtaining module is used for determining current projection position information according to the characteristic image.
Preferably, the adjusting module comprises:
the target projection position information determining unit is used for determining target projection position information of a target projection area according to the position information;
and the adjusting unit is used for adjusting the projection picture according to the target projection position information so as to enable the adjusted projection picture to be superposed with the target projection area.
Since the embodiment of the trapezoidal correction apparatus portion corresponds to the embodiment of the trapezoidal correction method portion, please refer to the description of the embodiment of the trapezoidal correction method portion, which is not repeated here.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The trapezoidal correction system and the trapezoidal correction method provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. A keystone correction system, comprising:
a projection device for projecting a projection picture;
the positioning paste is arranged on the target plane and used for forming an adjustable target area with a quadrilateral shape;
the camera is used for acquiring a target image comprising the adjustable target area;
and the processor is used for carrying out image processing on the target image to obtain the position information of the adjustable target area and adjusting the projection picture according to the position information and the current projection position information, wherein the current projection position information is the position information of the projection picture.
2. The keystone correction system of claim 1, wherein a surface of the positioning sticker is provided with a positioning pattern, wherein the positioning pattern comprises any one of a two-dimensional code, an aruco code, a line segment, and a geometric figure.
3. The keystone correction system of claim 1, wherein the positioning patch includes an adhesive layer, the positioning patch being secured to the target plane by the adhesive layer.
4. The keystone correction system of claim 3, wherein the viscosity of the adhesive layer is greater than 2500 cp.
5. The keystone correction system of claim 1, wherein the camera is an ultra wide angle camera.
6. A keystone correction method, comprising:
acquiring a target image corresponding to an adjustable target area formed by positioning stickers arranged on a target plane, wherein the shape of the adjustable target area is quadrilateral;
performing image processing on the target image to obtain position information of the adjustable target area;
and adjusting the projection picture according to the position information and the current projection position information, wherein the current projection position information is the position information of the projection picture.
7. The keystone correction method of claim 6, wherein the image processing the target image to obtain the position information of the tunable target area comprises:
performing image difference processing on the comparison image and the target image to obtain the position information of the adjustable target area,
wherein the contrast image is an image when the positioning patch is not arranged on the target plane.
8. The keystone correction method of claim 6, wherein before adjusting the projection screen based on the position information and the current projection position information, further comprising:
acquiring a full black image and a full white image, wherein the full black image is obtained by projecting a full black image on the target plane, and the full white image is obtained by projecting a full white image on the target plane;
and performing difference on the full black image and the full white image to obtain the current projection position information.
9. The keystone correction method of claim 6, wherein before the root adjusting the projection picture according to the position information and the current projection position information, further comprising:
acquiring a characteristic image, wherein the characteristic image is an image obtained by projecting a picture comprising a characteristic image on the target plane;
and determining the current projection position information according to the characteristic image.
10. The keystone correction method of any one of claims 6 to 9, wherein the adjusting the projection screen according to the position information and current projection position information, wherein the current projection position information is position information of the projection screen, comprises:
determining target projection position information of a target projection area according to the position information;
and adjusting the projection picture according to the target projection position information so as to enable the adjusted projection picture to be overlapped with a target projection area.
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| CN201911318488.1A CN110913191A (en) | 2019-12-19 | 2019-12-19 | Trapezoidal correction system and trapezoidal correction method |
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Cited By (1)
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| WO2022206527A1 (en) * | 2021-03-31 | 2022-10-06 | 青岛海信激光显示股份有限公司 | Method for projection image correction and laser projection device |
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