CN111988591A - Projection picture translation method and device and projection equipment - Google Patents
Projection picture translation method and device and projection equipment Download PDFInfo
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- CN111988591A CN111988591A CN202010869983.8A CN202010869983A CN111988591A CN 111988591 A CN111988591 A CN 111988591A CN 202010869983 A CN202010869983 A CN 202010869983A CN 111988591 A CN111988591 A CN 111988591A
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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 relates to a translation method of a projection picture, which comprises the steps of obtaining a first projection area projected onto a projection plane by a projection device; acquiring a second projection area on the projection plane by using a machine vision algorithm; and adjusting a projection lens of the projection device according to the first projection area and the second projection area until the first projection area and the second projection area are approximately coincident. The invention can project proper pictures without limiting the placing position of the projection equipment, completely does not lose the pixels and the definition of the projection pictures, solves the limitation of the projection equipment on the placing position, greatly widens the use scenes of projection products and improves the user experience. The invention also relates to a translation device for projecting the picture and a projection device.
Description
Technical Field
The invention relates to the technical field of projection equipment, in particular to a translation method and a translation device of a projection picture and projection equipment.
Background
The projector products on the market at present often need to be manually placed and adjusted to project a proper picture. Due to the requirement on the placement position, the use scene of the projector is limited.
Disclosure of Invention
The invention provides a projection picture translation method, a projection picture translation device and projection equipment, aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
a translation method of a projection picture comprises the following steps:
acquiring a first projection area projected onto a projection plane by projection equipment;
acquiring a second projection area on the projection plane by using a machine vision algorithm;
and adjusting a projection lens of the projection device according to the first projection area and the second projection area until the first projection area and the second projection area are approximately coincident.
The beneficial effects of the method scheme of the invention are as follows: the translation method of the projection picture is characterized in that a first projection area projected to a projection plane by the projection equipment is obtained, a second projection area of the projection plane is obtained by a machine vision algorithm, and the projection lens of the projection equipment is adjusted according to the first projection area and the second projection area until the first projection area and the second projection area are approximately overlapped, so that the purpose that the placement position of the projection equipment is not limited is achieved, a proper picture can be projected, the pixel and the definition of the projection picture are not lost completely, the problem that the placement position is limited by the projection equipment is solved, the use scene of the projection product is greatly widened, and the user experience is improved.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the adjusting a projection lens of the projection device according to the first projection area and the second projection area specifically includes:
establishing a rectangular coordinate system on the projection plane, acquiring a first coordinate of the central point of the first projection region on the rectangular coordinate system, and acquiring a second coordinate of the central point of the second projection region on the rectangular coordinate system;
adjusting the moving steps of a translation driving motor of a projection lens of the projection equipment according to the difference value of the first coordinate and the second coordinate until the central point of the first projection area is coincided with the central point of the second projection area;
adjusting the zooming step number of a zooming driving motor of a projection lens of the projection equipment according to the area of the first projection area and the area of the second projection area until the area of the first projection area is approximately consistent with the area of the second projection area;
the projection plane is a plane determined by two coordinate axes in a rectangular coordinate system, the origin of the rectangular coordinate system is the central point of the second projection area, the X coordinate axis is in the horizontal direction, and the Y coordinate axis is in the vertical direction.
The beneficial effect of adopting the further scheme is that: based on the position difference of the central points of the first projection area and the second projection area, the translation driving motor of the projection lens is adjusted, so that the central points of the first projection area and the second projection area are superposed, and based on the area of the first projection area and the area of the second projection area, the zoom driving motor of the projection lens is adjusted, so that the area of the first projection area is approximately consistent with the area of the second projection area, even if the placement position of the projection equipment is not good, the driving motor can be automatically adjusted, so that a proper projection picture is projected, and the pixel and definition of the projection picture are not lost at all.
Further, the adjusting the moving step number of the translation driving motor of the projection lens of the projection apparatus according to the difference between the first coordinate and the second coordinate specifically includes:
obtaining a difference value of the first coordinate and the second coordinate in the X-axis direction and a difference value of the first coordinate and the second coordinate in the Y-axis direction according to the first coordinate and the second coordinate;
and driving the left and right movement steps of the translation driving motor according to the difference value in the X-axis direction, and driving the up and down movement steps of the translation driving motor according to the difference value in the Y-axis direction until the central point of the first projection area is coincided with the central point of the second projection area.
The beneficial effect of adopting the further scheme is that: the moving steps of the translation driving motor of the projection lens of the projection equipment are adjusted according to the difference value of the first coordinate and the second coordinate, so that the center points of the first projection area and the second projection area are overlapped, and the projection equipment can project at a proper position on a projection plane.
Further, the obtaining a second projection area on the projection plane by using a machine vision algorithm specifically includes:
and acquiring a boundary line in the projection plane through the machine vision algorithm, and determining the second projection area according to the boundary line.
The beneficial effect of adopting the further scheme is that: and obtaining a boundary line of the projection plane according to a machine vision algorithm, and obtaining a region suitable for projection in the projection plane.
Further, the obtaining of the boundary line in the projection plane by the machine vision algorithm specifically includes:
acquiring image information of the projection plane;
and processing the image information of the projection plane through an edge detection algorithm based on OpenCV to obtain a boundary line of the projection plane.
Further, the determining the second projection area according to the boundary line specifically includes:
and obtaining an intersection point of the boundary line, and taking the intersection point and the inner area determined by the boundary line as the second projection area.
Another technical solution of the present invention for solving the above technical problems is as follows: a translation device for projecting a picture, comprising:
the acquisition module is used for acquiring a first projection area projected onto a projection plane by the projection equipment;
the calculation module is used for acquiring a second projection area on the projection plane by utilizing a machine vision algorithm;
and the adjusting module is used for adjusting a projection lens of the projection equipment according to the first projection area and the second projection area until the first projection area and the second projection area are approximately overlapped.
The invention has the beneficial effects that: the utility model provides a translation device of projection picture, through obtaining the first projection area that projection equipment projects the projection plane, and utilize machine vision algorithm to obtain the second projection area of projection plane, according to first projection area and second projection area, adjust projection equipment's projection lens, until first projection area and second projection area roughly coincide, the locating place that does not restrict projection equipment has been realized, also can throw out suitable picture, and pixel and the definition of not losing the projection picture at all, the restriction of projection equipment to locating place has been solved, very big widening the use scene of projection product, and user experience has been improved.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, the adjusting module is specifically configured to establish a rectangular coordinate system on the projection plane, obtain a first coordinate of a center point of the first projection region on the rectangular coordinate system, and obtain a second coordinate of a center point of the second projection region on the rectangular coordinate system;
adjusting the moving steps of a translation driving motor of a projection lens of the projection equipment according to the difference value of the first coordinate and the second coordinate until the central point of the first projection area is coincided with the central point of the second projection area;
adjusting the zooming step number of a zooming driving motor of a projection lens of the projection equipment according to the area of the first projection area and the area of the second projection area until the area of the first projection area is approximately consistent with the area of the second projection area;
the projection plane is a plane determined by two coordinate axes in a rectangular coordinate system, the origin of the rectangular coordinate system is the central point of the second projection area, the X coordinate axis is in the horizontal direction, and the Y coordinate axis is in the vertical direction.
Further, the adjusting module is specifically configured to obtain, according to the first coordinate and the second coordinate, a difference between the first coordinate and the second coordinate in an X-axis direction and a difference between the first coordinate and the second coordinate in a Y-axis direction;
and driving the left and right movement steps of the translation driving motor according to the difference value in the X-axis direction, and driving the up and down movement steps of the translation driving motor according to the difference value in the Y-axis direction until the central point of the first projection area is coincided with the central point of the second projection area.
In addition, this application still provides a projection equipment, projection equipment includes camera and the translation device of projection picture of any one of above-mentioned technical scheme.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for translating a projection image according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a translation device for projecting a picture according to another embodiment of the present invention;
fig. 3 is a schematic front view of a projection apparatus according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
At present, some large engineering projectors are provided with a projection lens which is larger than a projection lens actually required by projection imaging, and a projection picture is moved by moving the projection lens, so that when the hoisting position of the projector is fixed, the projection picture can be moved to a required projection screen without moving the position of the projector. However, the amount of displacement to move the screen left or right is generally limited, typically not exceeding 1/4 of the width of the projected image, and requires manual or remote control to move.
In addition, since the lens shift technology is complicated in structure and increases cost, in a household micro-projection product with a low selling price, a technology of rotating a projector body to align a projection picture to a projection screen or a projection area and then adjusting a right and left trapezoidal picture into a square rectangular picture through a software technology is adopted. In this way, when the angle of rotation of the projector body is larger, the lost pixel definition is more, and in addition, after the projector body rotates, the left side and the right side of the projection picture are not on the same focal plane of the projection lens, and the left side and the right side of the picture can not be focused clearly at the same time, which affects the use experience of users.
The application provides an automatic movement adjustment technology of projection picture, need not rotate the projector fuselage, through the optical displacement technique of the built-in camera cooperation projection lens of projection fuselage, just can realize the automatic alignment of projection picture and projection area or screen, solves the projector to the restriction problem of locating place, makes the projector put and also can throw out the square positive picture that does not lose pixel definition in the screen side.
As shown in fig. 1, a flowchart of a method for translating a projection image according to an embodiment of the present invention is shown, where the method for translating a projection image includes:
110. a first projection region projected onto a projection plane by a projection device is acquired.
120. And acquiring a second projection area on the projection plane by using a machine vision algorithm.
The machine vision algorithm can be an Object Detection (Object Detection) algorithm or the like, such as RCNN, Fast R-CNN, and Mask R-CNN algorithms. A suitable projection area, i.e., the second projection area, on the projection plane is identified by a machine vision algorithm, and a specific algorithm is used, which is not limited in this embodiment.
130. And adjusting a projection lens of the projection device according to the first projection area and the second projection area until the first projection area and the second projection area are approximately coincident.
It should be understood that, as shown in fig. 3, in this embodiment, a camera may be installed beside the projection lens of the projection apparatus, the optical axis direction of the camera lens is parallel to the optical axis direction of the projection lens, and the shooting angle of the camera is more than 2 times of the maximum angle of the projection light projected by the projection lens, so that the camera can clearly shoot the surface of the projector that is more than 2 times the diagonal of the projection screen. The shooting angle of the camera can be set according to actual use, and the embodiment is not limited.
The projection device is placed in a suitable position in front of the projection screen or surface, with the projection lens of the projection device approximately perpendicular to the projection plane. And acquiring a first projection area which can be projected on a projection plane by the projection equipment through a camera, wherein the first projection area is probably not the most suitable position and is relatively more, higher or lower. And acquiring a second projection area on the projection plane by utilizing a machine vision algorithm through image information of the projection plane shot by the camera, wherein the second projection area is an area which is most suitable for projection on the projection plane, and the machine vision algorithm is a relatively mature AI video image analysis algorithm at present. The reason why the projection lens of the projection device is adjusted according to the first projection area and the second projection area until the first projection area and the second projection area are approximately coincident is that the projected picture of the projection device and the determined second projection area may be consistent as much as possible due to the influence of the received positions of the projection device, the proper positions of the projection areas in the projection plane and the adjustment errors of the driving motor, but if the projection lens is approximately coincident, the use feeling of the user is not influenced.
Based on the translation method of the projection picture provided by the embodiment, the first projection area projected to the projection plane by the projection equipment is obtained, the second projection area of the projection plane is obtained by the machine vision algorithm, the projection lens of the projection equipment is adjusted according to the first projection area and the second projection area until the first projection area and the second projection area are approximately overlapped, so that the purpose that the placement position of the projection equipment is not limited is realized, a proper picture can be projected, the pixel and the definition of the projection picture are not lost completely, the limitation of the projection equipment on the placement position is solved, the use scene of the projection product is greatly widened, and the user experience is improved.
Based on the above embodiment, further, the step 130 specifically includes the following steps:
131. and establishing a rectangular coordinate system on the projection plane, acquiring a first coordinate of the central point of the first projection region on the rectangular coordinate system, and acquiring a second coordinate of the central point of the second projection region on the rectangular coordinate system.
132. And adjusting the moving steps of a translation driving motor of a projection lens of the projection equipment according to the difference value of the first coordinate and the second coordinate until the central point of the first projection area is coincided with the central point of the second projection area.
133. And adjusting the zooming step number of a zooming driving motor of a projection lens of the projection equipment according to the area of the first projection area and the area of the second projection area until the area of the first projection area is approximately consistent with the area of the second projection area.
The projection plane is a plane determined by two coordinate axes in the rectangular coordinate system, the origin of the rectangular coordinate system is the central point of the second projection area, the X coordinate axis is in the horizontal direction, and the Y coordinate axis is in the vertical direction.
Further, step 132 specifically includes:
and obtaining the difference value of the first coordinate and the second coordinate in the X-axis direction and the difference value of the first coordinate and the second coordinate in the Y-axis direction according to the first coordinate and the second coordinate.
And driving the translation driving motor to move left and right according to the difference value in the X-axis direction, and driving the translation driving motor to move up and down according to the difference value in the Y-axis direction until the central point of the first projection area and the central point of the second projection area coincide.
It should be understood that the positions and the sizes of the first projection area and the second projection area are compared, the relative coordinate position difference of the centers of the two projection areas in the projection plane along the horizontal direction X axis and the vertical direction Y axis is calculated, then the lens is translated up, down, left and right through the lens translation driving motor in the direction perpendicular to the optical axis of the projection lens, and at this time, the projection image picture is also moved along with the translation direction of the lens. And after the centers of the two positions are aligned, continuously driving a zoom motor of the projection lens to optically zoom the size of the image of the projected image according to the comparison between the size of the image of the projected image acquired by the visual plane of the camera and the size of the surface suitable for projection so as to enable the size of the image of the projected image to be as same as or close to the size of the surface suitable for projection as possible.
Further, step 120 specifically includes:
and acquiring a boundary line in the projection plane through a machine vision algorithm, and determining a second projection area according to the boundary line.
Further, acquiring image information of a projection plane;
and processing the image information of the projection plane through an edge detection algorithm based on OpenCV to obtain the boundary line of the projection plane.
Further, an intersection of the boundary lines is obtained, and the intersection and the inner region determined by the boundary lines are taken as a second projection region.
It should be understood that OpenCV is an open source computer vision library, and OpenCV-based edge detection algorithms include various algorithms such as Sobel, Scarry, Canny, Laplacian, Prewitt, Marr-hildersh, scharr, and the like. The embodiment does not limit the edge detection algorithm used specifically, and can be selected according to actual needs. After the processing of the edge detection algorithm, boundary lines of the projection plane can be obtained, wherein the boundary lines comprise four reference boundary lines, namely an upper reference boundary line, a lower reference boundary line, a left reference boundary line and a right reference boundary line, the four reference boundary lines are extended to obtain 4 intersection points, an inner area is determined according to the positions of the intersection points and the 4 reference boundary lines, and the inner area is a second projection area. Alternatively, a plurality of boundary lines may be obtained in each of the four directions, i.e., the upper, lower, left, and right directions of the approximate region, so that a plurality of intersection points may be obtained in each of the four directions by extending all the boundary lines, and the intersection points and the boundary lines may also determine an inner region, where the determined inner region is the second projection region.
As shown in fig. 2, a schematic structural diagram of a translation device for projecting an image according to another embodiment of the present invention is provided, in which the translation device for projecting an image includes:
the acquisition module is used for acquiring a first projection area projected onto a projection plane by the projection equipment;
the calculation module is used for acquiring a second projection area on the projection plane by utilizing a machine vision algorithm;
and the adjusting module is used for adjusting a projection lens of the projection equipment according to the first projection area and the second projection area until the first projection area and the second projection area are approximately overlapped.
Based on the foregoing embodiment, further, the adjusting module is specifically configured to establish a rectangular coordinate system on the projection plane, obtain a first coordinate of a center point of the first projection region on the rectangular coordinate system, and obtain a second coordinate of a center point of the second projection region on the rectangular coordinate system;
adjusting the moving steps of a translation driving motor of a projection lens of the projection equipment according to the difference value of the first coordinate and the second coordinate until the central point of the first projection area is coincided with the central point of the second projection area;
adjusting the zooming step number of a zooming driving motor of a projection lens of the projection equipment according to the area of the first projection area and the area of the second projection area until the area of the first projection area is approximately consistent with the area of the second projection area;
the projection plane is a plane determined by two coordinate axes in a rectangular coordinate system, the origin of the rectangular coordinate system is the central point of the second projection area, the X coordinate axis is in the horizontal direction, and the Y coordinate axis is in the vertical direction.
Further, the adjusting module is specifically configured to obtain, according to the first coordinate and the second coordinate, a difference between the first coordinate and the second coordinate in an X-axis direction and a difference between the first coordinate and the second coordinate in a Y-axis direction;
and driving the left and right movement steps of the translation driving motor according to the difference value in the X-axis direction, and driving the up and down movement steps of the translation driving motor according to the difference value in the Y-axis direction until the central point of the first projection area is coincided with the central point of the second projection area.
The application also provides a projection device, which comprises a camera and the translation device for the projection picture in any one of the technical schemes.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for translating a projection picture, comprising:
acquiring a first projection area projected onto a projection plane by projection equipment;
acquiring a second projection area on the projection plane by using a machine vision algorithm;
and adjusting a projection lens of the projection device according to the first projection area and the second projection area until the first projection area and the second projection area are approximately coincident.
2. The method for translating a projection screen according to claim 1, wherein the adjusting a projection lens of the projection device according to the first projection area and the second projection area specifically comprises:
establishing a rectangular coordinate system on the projection plane, acquiring a first coordinate of the central point of the first projection region on the rectangular coordinate system, and acquiring a second coordinate of the central point of the second projection region on the rectangular coordinate system;
adjusting the moving steps of a translation driving motor of a projection lens of the projection equipment according to the difference value of the first coordinate and the second coordinate until the central point of the first projection area is coincided with the central point of the second projection area;
adjusting the zooming step number of a zooming driving motor of a projection lens of the projection equipment according to the area of the first projection area and the area of the second projection area until the area of the first projection area is approximately consistent with the area of the second projection area;
the projection plane is a plane determined by two coordinate axes in a rectangular coordinate system, the origin of the rectangular coordinate system is the central point of the second projection area, the X coordinate axis is in the horizontal direction, and the Y coordinate axis is in the vertical direction.
3. The method according to claim 2, wherein the adjusting the number of moving steps of a translation driving motor of the projection lens of the projection device according to the difference between the first coordinate and the second coordinate comprises:
obtaining a difference value of the first coordinate and the second coordinate in the X-axis direction and a difference value of the first coordinate and the second coordinate in the Y-axis direction according to the first coordinate and the second coordinate;
and driving the left and right movement steps of the translation driving motor according to the difference value in the X-axis direction, and driving the up and down movement steps of the translation driving motor according to the difference value in the Y-axis direction until the central point of the first projection area is coincided with the central point of the second projection area.
4. The method according to claim 1, wherein the obtaining the second projection area on the projection plane by using a machine vision algorithm specifically comprises:
and acquiring a boundary line in the projection plane through the machine vision algorithm, and determining the second projection area according to the boundary line.
5. The method for translating a projection screen according to claim 4, wherein the obtaining the boundary line in the projection plane by the machine vision algorithm specifically comprises:
acquiring image information of the projection plane;
and processing the image information of the projection plane through an edge detection algorithm based on OpenCV to obtain a boundary line of the projection plane.
6. The method for translating a projection screen according to claim 4 or 5, wherein the determining the second projection area according to the boundary line specifically comprises:
and obtaining an intersection point of the boundary line, and taking the intersection point and the inner area determined by the boundary line as the second projection area.
7. A translation device for projecting a picture, comprising:
the acquisition module is used for acquiring a first projection area projected onto a projection plane by the projection equipment;
the calculation module is used for acquiring a second projection area on the projection plane by utilizing a machine vision algorithm;
and the adjusting module is used for adjusting a projection lens of the projection equipment according to the first projection area and the second projection area until the first projection area and the second projection area are approximately overlapped.
8. The translation apparatus for a projection screen according to claim 7,
the adjusting module is specifically configured to establish a rectangular coordinate system on the projection plane, obtain a first coordinate of a center point of the first projection region on the rectangular coordinate system, and obtain a second coordinate of a center point of the second projection region on the rectangular coordinate system;
adjusting the moving steps of a translation driving motor of a projection lens of the projection equipment according to the difference value of the first coordinate and the second coordinate until the central point of the first projection area is coincided with the central point of the second projection area;
adjusting the zooming step number of a zooming driving motor of a projection lens of the projection equipment according to the area of the first projection area and the area of the second projection area until the area of the first projection area is approximately consistent with the area of the second projection area;
the projection plane is a plane determined by two coordinate axes in a rectangular coordinate system, the origin of the rectangular coordinate system is the central point of the second projection area, the X coordinate axis is in the horizontal direction, and the Y coordinate axis is in the vertical direction.
9. The translation apparatus for a projection screen according to claim 8,
the adjusting module is specifically configured to obtain a difference value of the first coordinate and the second coordinate in an X-axis direction and a difference value of the first coordinate and the second coordinate in a Y-axis direction according to the first coordinate and the second coordinate;
and driving the left and right movement steps of the translation driving motor according to the difference value in the X-axis direction, and driving the up and down movement steps of the translation driving motor according to the difference value in the Y-axis direction until the central point of the first projection area is coincided with the central point of the second projection area.
10. A projection device, characterized in that the projection device comprises a camera and a translation means for projecting a picture according to any of claims 7-9.
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