CN107146205B - Distorted image correction method, touch position identification method and device - Google Patents
Distorted image correction method, touch position identification method and device Download PDFInfo
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- 238000004590 computer program Methods 0.000 description 5
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/80—Geometric correction
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Abstract
The invention provides a distorted image correction method, a touch position identification method and a touch position identification device. The method comprises the following steps: aiming at each target calibration point of a screen to be calibrated, projecting two straight lines to the screen to be calibrated, wherein the intersection point of the two straight lines is the target calibration point; acquiring the corresponding relation between each point of a screen to be calibrated and each point in a calibration image, wherein the calibration image is an image of the screen to be calibrated, which is acquired when two straight lines are projected to the screen to be calibrated; and correcting the distorted image according to the corresponding relation between each point of the calibrated screen and each point in the calibrated image. According to the embodiment of the invention, the screen is calibrated in a manner of projecting a straight line to the screen without performing geometric correction on the camera, and the distorted image is corrected by using the calibrated screen coordinate points, so that the anti-interference capability in the calibration process is strong, and the correction result is more accurate.
Description
Technical Field
the invention relates to the technical field of image processing, in particular to a distorted image correction method, a touch position identification method and a device.
background
In order to add a touch function on a traditional screen and facilitate human-computer interaction, a camera can be installed in front of the screen, and an interactive system which cannot perform touch operation originally can be upgraded to a system with a touch function by acquiring a touch position of a user through the camera. Because the image collected by the camera has distortion, geometric correction needs to be performed on the camera or the distorted image needs to be corrected, so that the touch position is identified according to the collected image.
In the geometric correction method for the camera in the prior art, camera parameters are solved by utilizing the relationship between the characteristic points of the calibration object and the corresponding points on the image, so that the calibration process is completed, but the calibration of the camera needs to customize the calibration object, so that strict requirements on the placement and use of the calibration object are met, and the operation is complex.
Under the premise of not carrying out geometric correction on the camera, the image acquired by the camera can generate distortion, in the conventional distorted image correction method, the screen is calibrated by using a checkerboard displayed on the screen, and then the distorted image is corrected, but the correction result in the method is greatly influenced by ambient light, and the correction result is inaccurate.
Disclosure of Invention
The embodiment of the invention provides a distorted image correction method, a touch position identification method and a touch position identification device, which are used for solving the problems that the correction result of the existing distorted image correction method is greatly influenced by ambient illumination and is inaccurate.
the embodiment of the invention provides a distorted image correction method, which comprises the following steps:
aiming at each target calibration point of a screen to be calibrated, projecting two straight lines to the screen to be calibrated, wherein the intersection point of the two straight lines is the target calibration point;
acquiring the corresponding relation between each point of a screen to be calibrated and each point in a calibration image, wherein the calibration image is an image of the screen to be calibrated, which is acquired when two straight lines are projected to the screen to be calibrated;
and correcting the distorted image according to the corresponding relation between each point of the calibrated screen and each point in the calibrated image.
optionally, the obtaining of the corresponding relationship between each point of the screen to be calibrated and each point in the calibration image includes:
And acquiring two curves corresponding to the two straight lines in the calibration image, wherein the intersection point of the two curves corresponds to the target calibration point.
optionally, the obtaining of the corresponding relationship between each point of the screen to be calibrated and each point in the calibration image includes:
Acquiring the corresponding relation between a preset number of target calibration points of a screen to be calibrated and each point in a calibration image;
And obtaining the corresponding relation between each point of the screen to be calibrated and each point in the calibration image according to the corresponding relation between the preset number of target calibration points and each point in the calibration image by adopting an interpolation method.
Optionally, the correcting the distorted image according to the correspondence between each point of the calibrated screen and each point in the calibrated image includes:
And filling the color of each point in the distorted image to the corresponding point of the calibrated screen to obtain a corrected image.
The embodiment of the invention provides a touch position identification method, which comprises the following steps:
Correcting the acquired touch image by adopting the method;
And identifying a touch position according to the corrected touch image.
an embodiment of the present invention provides a distorted image correction apparatus, including:
the device comprises a straight line projection unit, a calibration unit and a calibration unit, wherein the straight line projection unit is used for projecting two straight lines to a screen to be calibrated aiming at each target calibration point of the screen to be calibrated, and the intersection point of the two straight lines is a target calibration point;
The device comprises a corresponding relation obtaining unit, a calibration image obtaining unit and a control unit, wherein the corresponding relation obtaining unit is used for obtaining the corresponding relation between each point of a screen to be calibrated and each point in a calibration image, and the calibration image is an image of the screen to be calibrated, which is acquired when two straight lines are projected to the screen to be calibrated;
And the correcting unit is used for correcting the distorted image according to the corresponding relation between each point of the calibrated screen and each point in the calibrated image.
optionally, the correspondence obtaining unit is further configured to:
And acquiring two curves corresponding to the two straight lines in the calibration image, wherein the intersection point of the two curves corresponds to the target calibration point.
optionally, the correspondence obtaining unit is further configured to:
acquiring the corresponding relation between a preset number of target calibration points of a screen to be calibrated and each point in a calibration image;
and obtaining the corresponding relation between each point of the screen to be calibrated and each point in the calibration image according to the corresponding relation between the preset number of target calibration points and each point in the calibration image by adopting an interpolation method.
Optionally, the correction unit is further configured to:
and filling the color of each point in the distorted image to the corresponding point of the calibrated screen to obtain a corrected image.
An embodiment of the present invention provides a touch position identification apparatus, including:
the correction unit is used for correcting the acquired touch image by adopting the device;
And the touch position identification unit is used for identifying the touch position according to the corrected touch image.
according to the distorted image correction method, the touch position identification method and the device, aiming at each target calibration point of a screen to be calibrated, two straight lines are projected to the screen to be calibrated, and the intersection point of the two straight lines is the target calibration point; acquiring the corresponding relation between each point of a screen to be calibrated and each point in a calibration image, wherein the calibration image is an image of the screen to be calibrated, which is acquired when two straight lines are projected to the screen to be calibrated; and correcting the distorted image according to the corresponding relation between each point of the calibrated screen and each point in the calibrated image. According to the embodiment of the invention, the screen is calibrated in a manner of projecting a straight line to the screen without performing geometric correction on the camera, and the distorted image is corrected by using the calibrated screen coordinate points, so that the anti-interference capability in the calibration process is strong, and the correction result is more accurate.
drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram of a distorted image correction method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an acquisition screen area of one embodiment of the present invention;
fig. 3a, 3b, and 3c are schematic diagrams of obtaining a correspondence relationship according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the calibration of a screen according to one embodiment of the present invention;
FIG. 5 is a flowchart illustrating a touch location identification method according to an embodiment of the invention;
FIG. 6 is a schematic structural diagram of a distorted image correcting apparatus according to an embodiment of the present invention;
Fig. 7 is a schematic structural diagram of a touch position recognition device according to an embodiment of the invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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, but not all, embodiments of the present invention. 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.
fig. 1 is a flowchart illustrating a distorted image correction method according to an embodiment of the present invention. As shown in fig. 1, the method of this embodiment includes:
S11: aiming at each target calibration point of a screen to be calibrated, projecting two straight lines to the screen to be calibrated, wherein the intersection point of the two straight lines is the target calibration point;
it should be noted that, before the distorted image is corrected, the screen needs to be calibrated, and a target calibration point is selected on the screen to be calibrated.
s12: acquiring the corresponding relation between each point of a screen to be calibrated and each point in a calibration image, wherein the calibration image is an image of the screen to be calibrated, which is acquired when two straight lines are projected to the screen to be calibrated;
it should be noted that, in the embodiment of the present invention, two curves corresponding to the two straight lines in the calibration image are obtained, and an intersection point of the two curves corresponds to the target calibration point, so as to obtain a correspondence relationship between each point of the screen to be calibrated and each point in the calibration image.
in practical application, a camera is arranged near the screen, so that the camera can acquire an image comprising the whole screen area. As shown in fig. 2, the screen is set to black, the camera acquires the image a at this time, and then the screen is set to white, the camera acquires the image B at this time, and the area corresponding to the larger absolute value can be roughly determined as the screen area by | a-B |. Other ways of determining the screen area are also possible, and the invention is not limited in this respect.
it can be understood that, in the image collected by the camera, the straight line projected to the screen is a circular arc curve. As shown in fig. 3a, 3b and 3c, two straight lines may be projected for each target calibration point, and two distorted straight lines are approximated by curves in the actually collected image through the two straight lines intersecting the target calibration point, and the intersection point of two known straight lines on the screen necessarily corresponds to the intersection point of two circular arc curves. Taking fig. 3a as an example, straight lines L1 and L2 are projected to the screen, and L1 and L2 intersect at the point P1 of the screen; in the image (calibration image) acquired by the camera, the curve C1 corresponds to L1, the curve C2 corresponds to L2, and the intersection Q1 of the curve C1 and the curve C2 corresponds to P1, so that calibration of the target calibration point P1 is completed.
S13: and correcting the distorted image according to the corresponding relation between each point of the calibrated screen and each point in the calibrated image.
according to the distorted image correction method provided by the embodiment of the invention, the screen is calibrated in a manner of projecting a straight line to the screen under the condition of not performing geometric correction on the camera, the distorted image is corrected by using the calibrated screen coordinate points, the anti-interference capability in the calibration process is strong, and the correction result is more accurate.
In an optional implementation manner of the embodiment of the present invention, the obtaining of the correspondence between each point of the screen to be calibrated and each point in the calibration image includes:
acquiring the corresponding relation between a preset number of target calibration points of a screen to be calibrated and each point in a calibration image;
And obtaining the corresponding relation between each point of the screen to be calibrated and each point in the calibration image according to the corresponding relation between the preset number of target calibration points and each point in the calibration image by adopting an interpolation method.
it can be understood that, in order to improve the efficiency of calibrating the screen, the embodiment of the invention calibrates the target calibration points with the preset number, and then calibrates the points which are not calibrated according to the points calibrated on the screen by adopting an interpolation method. As shown in fig. 4, in the embodiment of the present invention, the intersections of the grid are calibrated, and each intersection of the grid corresponds to an actually acquired distorted network, so that points that are not calibrated can be calibrated by using an interpolation method.
specifically, the correcting the distorted image according to the correspondence between each point of the calibrated screen and each point in the calibrated image includes:
and filling the color of each point in the distorted image to the corresponding point of the calibrated screen to obtain a corrected image.
Fig. 5 is a flowchart illustrating a touch location identification method according to an embodiment of the invention. As shown in fig. 5, the method of the embodiment of the present invention includes:
S51: correcting the acquired touch image by adopting the method;
S52: and identifying a touch position according to the corrected touch image.
According to the touch position identification method provided by the embodiment of the invention, the screen is calibrated in a manner of projecting a straight line to the screen under the condition of not performing geometric correction on the camera, the distorted image is corrected by using the calibrated screen coordinate points, the anti-interference capability in the calibration process is strong, the correction result is more accurate, and the touch position of a user can be more accurately identified.
fig. 6 is a schematic structural diagram of a distorted image correction apparatus according to an embodiment of the present invention. As shown in fig. 6, the apparatus of the embodiment of the present invention includes a straight line projection unit 61, a correspondence relation acquisition unit 62, and a correction unit 63, specifically:
the straight line projection unit 61 is used for projecting two straight lines to the screen to be calibrated aiming at each target calibration point of the screen to be calibrated, and the intersection point of the two straight lines is a target calibration point;
A corresponding relation obtaining unit 62, configured to obtain a corresponding relation between each point of a screen to be calibrated and each point in a calibration image, where the calibration image is an image of the screen to be calibrated, which is acquired when two straight lines are projected onto the screen to be calibrated;
And the correcting unit 63 is used for correcting the distorted image according to the corresponding relation between each point of the calibrated screen and each point in the calibrated image.
the correspondence obtaining unit 62 is further configured to:
and acquiring two curves corresponding to the two straight lines in the calibration image, wherein the intersection point of the two curves corresponds to the target calibration point.
The correspondence obtaining unit 62 is further configured to:
Acquiring the corresponding relation between a preset number of target calibration points of a screen to be calibrated and each point in a calibration image;
And obtaining the corresponding relation between each point of the screen to be calibrated and each point in the calibration image according to the corresponding relation between the preset number of target calibration points and each point in the calibration image by adopting an interpolation method.
the correction unit 63 is further configured to:
and filling the color of each point in the distorted image to the corresponding point of the calibrated screen to obtain a corrected image.
The distorted image correction device of the embodiment of the invention can be used for executing the distorted image correction method embodiment, the principle and the technical effect are similar, and the details are not repeated here.
fig. 7 is a schematic structural diagram of a touch position recognition device according to an embodiment of the invention. As shown in fig. 7, the apparatus of the embodiment of the present invention includes a correction unit 71 and a touch position identification unit 72, specifically:
a correction unit 71, configured to correct the acquired touch image by using the above apparatus;
and a touch position identification unit 72 for identifying a touch position according to the corrected touch image.
the touch position identifying device of the embodiment of the invention can be used for executing the embodiment of the touch position identifying method, and the principle and the technical effect are similar, so that the details are not repeated here.
according to the distorted image correction method, the touch position identification method and the device, aiming at each target calibration point of a screen to be calibrated, two straight lines are projected to the screen to be calibrated, and the intersection point of the two straight lines is the target calibration point; acquiring the corresponding relation between each point of a screen to be calibrated and each point in a calibration image, wherein the calibration image is an image of the screen to be calibrated, which is acquired when two straight lines are projected to the screen to be calibrated; and correcting the distorted image according to the corresponding relation between each point of the calibrated screen and each point in the calibrated image. According to the embodiment of the invention, the screen is calibrated in a manner of projecting a straight line to the screen without performing geometric correction on the camera, and the distorted image is corrected by using the calibrated screen coordinate points, so that the anti-interference capability in the calibration process is strong, and the correction result is more accurate.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A distorted image correction method, comprising:
aiming at each target calibration point of a screen to be calibrated, projecting two straight lines to the screen to be calibrated, wherein the intersection point of the two straight lines is the target calibration point;
Acquiring the corresponding relation between each point of a screen to be calibrated and each point in a calibration image, wherein the calibration image is an image of the screen to be calibrated, which is acquired when two straight lines are projected to the screen to be calibrated;
Correcting the distorted image according to the corresponding relation between each point of the calibrated screen and each point in the calibrated image;
the acquiring of the corresponding relationship between each point of the screen to be calibrated and each point in the calibration image includes:
acquiring the corresponding relation between a preset number of target calibration points of a screen to be calibrated and each point in a calibration image;
And obtaining the corresponding relation between each point of the screen to be calibrated and each point in the calibration image according to the corresponding relation between the preset number of target calibration points and each point in the calibration image by adopting an interpolation method.
2. the method of claim 1, wherein correcting the distorted image according to the correspondence between the points of the calibrated screen and the points of the calibrated image comprises:
And filling the color of each point in the distorted image to the corresponding point of the calibrated screen to obtain a corrected image.
3. A touch position identification method is characterized by comprising the following steps:
Correcting the acquired touch image by adopting the method of any one of claims 1-2;
And identifying a touch position according to the corrected touch image.
4. A distorted image correction apparatus, comprising:
the device comprises a straight line projection unit, a calibration unit and a calibration unit, wherein the straight line projection unit is used for projecting two straight lines to a screen to be calibrated aiming at each target calibration point of the screen to be calibrated, and the intersection point of the two straight lines is a target calibration point;
The device comprises a corresponding relation obtaining unit, a calibration image obtaining unit and a control unit, wherein the corresponding relation obtaining unit is used for obtaining the corresponding relation between each point of a screen to be calibrated and each point in a calibration image, and the calibration image is an image of the screen to be calibrated, which is acquired when two straight lines are projected to the screen to be calibrated;
the correction unit is used for correcting the distorted image according to the corresponding relation between each point of the calibrated screen and each point in the calibrated image;
wherein the corresponding relationship obtaining unit is further configured to:
Acquiring the corresponding relation between a preset number of target calibration points of a screen to be calibrated and each point in a calibration image;
and obtaining the corresponding relation between each point of the screen to be calibrated and each point in the calibration image according to the corresponding relation between the preset number of target calibration points and each point in the calibration image by adopting an interpolation method.
5. the apparatus of claim 4, wherein the correction unit is further configured to:
And filling the color of each point in the distorted image to the corresponding point of the calibrated screen to obtain a corrected image.
6. a touch position recognition device, comprising:
a correction unit for correcting the acquired touch image by using the device of any one of claims 4-5;
and the touch position identification unit is used for identifying the touch position according to the corrected touch image.
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