CN110809141A - Trapezoidal correction method and device, projector and storage medium - Google Patents
Trapezoidal correction method and device, projector and storage medium Download PDFInfo
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- CN110809141A CN110809141A CN201910937156.5A CN201910937156A CN110809141A CN 110809141 A CN110809141 A CN 110809141A CN 201910937156 A CN201910937156 A CN 201910937156A CN 110809141 A CN110809141 A CN 110809141A
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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 embodiment of the application provides a trapezoidal correction method, a trapezoidal correction device, a projector and a storage medium, wherein the method comprises the following steps: shooting a projection image projected to a target area by a projector through a camera device; identifying a projected content region in the projected image; analyzing whether trapezoidal distortion exists at the boundary of the projection content area; if the comprehensive trapezoidal distortion occurs, determining a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction and a first vertical distortion angle corresponding to the comprehensive trapezoidal distortion; determining a first horizontal rotation direction and a first horizontal rotation angle according to the first horizontal distortion direction and the first horizontal distortion angle; controlling a transmission device to rotate the projector to a first target position according to a first horizontal rotation direction and a first horizontal rotation angle; and performing vertical trapezoidal correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle. The trapezoidal correction in the vertical direction and the horizontal direction can be achieved.
Description
Technical Field
The application relates to the technical field of projection, in particular to a trapezoidal correction method and device, a projector and a storage medium.
Background
In the use of projecting apparatus, if we can't let the position of projecting apparatus and projection curtain or projection wall be the right angle, then the trapezoidal deformation can appear in the picture effect of projection certainly. At this time, the keystone correction function of the projector will be performed, so that the picture can be guaranteed to be a standard rectangle, and therefore, the common projectors are all provided with the keystone correction function.
At present, the projector in the market generally can place the trapezoidal deformation that is not just causing to the vertical direction and carry out automatic correction, places trapezoidal deformation that is not just causing and then can't carry out automatic correction to the horizontal direction, needs to rectify through professional technical staff is manual. The general users are inconvenient to use. At the same time, manual calibration is costly. However, there is no technology for automatically correcting trapezoidal deformation caused by improper vertical placement and uneven horizontal placement.
Disclosure of Invention
The embodiment of the application provides a trapezoidal correction method and device, a projector and a storage medium, which can realize trapezoidal correction in the vertical direction and the horizontal direction.
A first aspect of an embodiment of the present application provides a keystone correction method, which is applied to a projector system including a projector, an image pickup device, and a transmission device, and includes:
shooting a projection image projected to a target area by the projector through a camera device;
identifying a projected content region in the projected image;
analyzing whether keystone distortion exists at the boundary of the projection content area;
determining a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction and a first vertical distortion angle corresponding to the comprehensive keystone distortion under the condition that the keystone distortion exists at the boundary of the projection content area and the keystone distortion is the comprehensive keystone distortion, wherein the comprehensive keystone distortion comprises the combination of the horizontal keystone distortion and the vertical keystone distortion;
determining a first horizontal rotation direction and a first horizontal rotation angle of the transmission according to the first horizontal distortion direction and the first horizontal distortion angle;
controlling the transmission device to rotate the projector to a first target position according to the first horizontal rotation direction and the first horizontal rotation angle;
and after the projector rotates to the first target position, performing vertical keystone correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle.
A second aspect of embodiments of the present application provides a trapezoidal correction device, which is applied to a projector system including a projector, a camera, and a transmission device, the trapezoidal correction device including:
a shooting unit for shooting a projection image projected to a target area by the projector through a camera;
an identification unit configured to identify a projection content area in the projection image;
an analysis unit configured to analyze whether or not trapezoidal distortion exists at a boundary of the projected content area;
a determining unit, configured to determine a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction, and a first vertical distortion angle corresponding to a synthetic keystone in a case where a keystone distortion exists at a boundary of the projection content area and the keystone distortion is a synthetic keystone distortion, where the synthetic keystone distortion includes a combination of a horizontal keystone distortion and a vertical keystone distortion;
the determining unit is further used for determining a first horizontal rotating direction and a first horizontal rotating angle of the transmission device according to the first horizontal distortion direction and the first horizontal distortion angle;
the control unit is used for controlling the transmission device to rotate the projector to a first target position according to the first horizontal rotation direction and the first horizontal rotation angle;
and the trapezoidal correction unit is used for performing vertical trapezoidal correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle after the projector rotates to the first target position.
A third aspect of embodiments of the present application provides a projector comprising a processor and a memory, the memory being configured to store a computer program, the computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the step instructions as in the first aspect of embodiments of the present application.
A fourth aspect of embodiments of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program makes a computer perform part or all of the steps as described in the first aspect of embodiments of the present application.
A fifth aspect of embodiments of the present application provides a computer program product, wherein the computer program product comprises a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps as described in the first aspect of embodiments of the present application. The computer program product may be a software installation package.
In the embodiment of the application, a projection image projected to a target area by a projector is shot by a camera device; identifying a projected content region in the projected image; analyzing whether trapezoidal distortion exists at the boundary of the projection content area; determining a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction and a first vertical distortion angle corresponding to the comprehensive trapezoidal distortion under the condition that the trapezoidal distortion exists at the boundary of the projection content area and the trapezoidal distortion is the comprehensive trapezoidal distortion, wherein the comprehensive trapezoidal distortion comprises the combination of the horizontal trapezoidal distortion and the vertical trapezoidal distortion; determining a first horizontal rotation direction and a first horizontal rotation angle of the transmission device according to the first horizontal distortion direction and the first horizontal distortion angle; controlling a transmission device to rotate the projector to a first target position according to a first horizontal rotation direction and a first horizontal rotation angle; and after the projector rotates to the first target position, performing vertical trapezoidal correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle. When the comprehensive trapezoidal distortion of the projection image projected to the target area by the projector is detected, the projector is rotated through the transmission device to correct the horizontal trapezoidal distortion, then the vertical trapezoidal distortion is corrected through the vertical trapezoidal correction algorithm, and the comprehensive trapezoidal distortion can be automatically corrected, so that the trapezoidal correction in the vertical direction and the horizontal direction can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a projection system provided in an embodiment of the present application;
FIG. 2 is a schematic flowchart of a trapezoidal correction method according to an embodiment of the present application;
fig. 3 is a schematic projection diagram of a projector projecting onto a target area according to an embodiment of the present application;
FIG. 4 is a schematic flow chart illustrating another trapezoidal correction method provided in the embodiments of the present application;
fig. 5 is a schematic structural diagram of a trapezoidal correction apparatus according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a projector according to an embodiment of the present application.
Detailed Description
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 only a part of the embodiments of the present application, and not all of the 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.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
For a better understanding of the present application, a projection system is provided below. Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection system according to an embodiment of the present disclosure. As shown in fig. 1, the projection system 100 includes a projector 10, an image pickup device 20, and an actuator 30. Among them, the projector 10 may include a light source module, an image processing module, an optical modulation module, and an optical projection module.
A light source module for projecting light to the optical modulation module;
the image processing module is used for receiving the image signal, processing the image signal to obtain a processed image signal and outputting the processed image signal to the optical modulation module;
the optical modulation module is used for modulating the light from the light source module according to the processed image signal to obtain modulated light;
and the optical projection module is used for projecting the modulated light to a target area so as to form a projection image.
The projector can be connected with terminal devices such as a computer, a mobile phone and a tablet personal computer, and the terminal devices can be in wired connection (for example, in wired connection through a video graphic array interface) or in wireless connection (for example, in wireless connection through a WiFi or high-definition multimedia interface) with the projector. The terminal device may transmit an image signal, a video signal, an audio signal, and the like to the projector.
A Video Graphics Array (VGA) interface is a special interface for outputting data by a computer according to VGA standards. The VGA interface is an interface for transmitting analog audio and video signals.
A High Definition Multimedia Interface (HDMI) is a fully digital video and audio transmission Interface, and can transmit uncompressed audio and video signals. HDMI is an interface for transmitting digital audio and video signals.
In the embodiment of the present application, the projector 10 may be connected to the image capturing device 20, and may receive a projection image that is captured by the image capturing device 20 and projected to a target area by the projector 10, and the projector 10 analyzes the projection image captured by the image capturing device 20, and determines whether to process transmission of an image signal from the terminal device to the projector. The target area may be a projection-enabled area such as a curtain or a wall surface.
The camera 20 may be provided in a place where the entire view of the target area can be taken. The camera device 20 may have at least two wide angle cameras. For example, camera 20 may include 4 wide-angle cameras, and the 4 wide-angle cameras may be distributed at 4 corners of the plane of projector 10 facing the target area. Due to the fact that the projector 10 comprises the 4 wide-angle cameras, the pictures shot by the camera device 20 can cover a larger visual angle, so that under the condition that the vertical distance between the projector 10 and the target area is smaller than a preset distance threshold (for example, smaller than 1 meter), the camera device 20 can still shoot the projection images of the whole target area, and further the subsequent projection correction requirements can be met.
The camera 20 may be in communication with the projector 10, and may transmit the captured picture to the projector 10 for analysis.
The transmission 30 may comprise a gear transmission. The gear transmission may include gears, motors, and the like. The transmission 30 may control the gear rotation by a motor so that the band pass projector 10 moves in the horizontal direction.
The driving device 30 may be controlled by the projector 10, so that the projector 10 moves in the horizontal direction, so as to correct the horizontal direction projected by the projector 10, and further, the direction projected by the projector 10 is perpendicular to the target area, thereby ensuring that the projection area projected by the projector 10 to the target area presents a rectangular shape.
In the projection system of the embodiment of the application, the projector can analyze and judge whether horizontal correction and vertical correction are needed to be carried out on the projection image shot by the camera. When horizontal correction and vertical correction are needed, the projector can control the projector to move in the horizontal direction through the transmission device, correction is carried out on the horizontal direction of the projector, and then vertical trapezoidal distortion can be corrected through a vertical trapezoidal correction algorithm, so that trapezoidal correction in the vertical direction and the horizontal direction can be realized.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a trapezoidal correction method according to an embodiment of the present disclosure. As shown in fig. 2, the keystone correction method is applied to the projection system shown in fig. 1, and the keystone correction method may include the following steps.
The projector captures a projection image projected by the projector to the target area by the image pickup device 201.
In the embodiment of the application, the projector can project the projection image on the target area. If the plane of the projector projecting light rays is not parallel to the plane of the target area, the projected image projected to the target area by the projector is deformed, and the projection viewing effect is influenced.
The camera device can include two at least wide-angle cameras, and the plane at every wide-angle camera place all keeps parallel with the plane at target area place, guarantees that the projected image that wide-angle camera was shot can not take place deformation.
The projector identifies a projected content region in the projected image 202.
In the embodiment of the application, the projector can perform image recognition processing on the projection image and recognize the projection content area in the projection image. The projection content area is an area irradiated by light, and the projector can identify the boundary of the projection content area through an image boundary identification algorithm. The image boundary recognition algorithm may include any one of a Sobel (Sobel) edge detection algorithm, a roberts (Robert) cross edge detection algorithm, a Canny edge detection algorithm, a Marr-Hildreth edge detection algorithm.
Specifically, the projector may select an image boundary recognition algorithm matching the color of light projected by an optical projection module in the projector. For light with different colors, different image boundary recognition algorithms are adopted, so that the accuracy of boundary recognition is improved.
The projector analyzes whether or not keystone distortion exists at the boundary of the projected content area 203.
In the embodiment of the present application, the projector may determine whether trapezoidal distortion exists according to a shape of a quadrangle surrounded by boundaries of the projection content area.
If the quadrangle surrounded by the boundary of the projection content area is a rectangle, no trapezoidal distortion exists;
trapezoidal distortion exists if the quadrilateral enclosed by the boundaries of the projected content area is not a rectangle.
204, in the case that the keystone distortion exists at the boundary of the projection content area and the keystone distortion is the integrated keystone distortion, the projector determines a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction and a first vertical distortion angle corresponding to the integrated keystone distortion, and the integrated keystone distortion includes a combination of the horizontal keystone distortion and the vertical keystone distortion.
In the embodiment of the present application, the keystone distortion includes any one of horizontal keystone distortion, vertical keystone distortion, and synthetic keystone distortion. The keystone distortion is caused because the plane of the light projected by the projector is not parallel to the plane of the target area. There are three situations in which the plane of the light projected by the projector is not parallel to the plane of the target area. The first case is: in the case where the plane on which the projector projects light is parallel to the plane on which the target area is located, if the projector is moved in the horizontal direction, the trapezoidal distortion generated in this case becomes horizontal trapezoidal distortion. The second case is: in the case where the plane on which the projector projects light is parallel to the plane on which the target area is located, if the projector is moved in the vertical direction, trapezoidal distortion generated in this case becomes vertical trapezoidal distortion. The third case is: in the case where the plane on which the projector projects light is parallel to the plane on which the target area is located, if the projector is moved in both the horizontal direction and the vertical direction, the trapezoidal distortion generated in this case becomes comprehensive trapezoidal distortion.
If the integrated keystone distortion is present, the projector may determine a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction, and a first vertical distortion angle corresponding to the integrated keystone distortion.
The first horizontal distortion direction may be left or right, and the first vertical distortion direction may be up or down.
The projector determines a first horizontal rotation direction and a first horizontal rotation angle of the transmission according to the first horizontal distortion direction and the first horizontal distortion angle 205.
In the embodiment of the application, if the first horizontal distortion direction corresponding to the comprehensive trapezoidal distortion is rightward, which indicates that the placement position of the projector deviates rightward, the first horizontal rotation direction of the transmission device is leftward, and the projector needs to rotate leftward for correction; if the first horizontal distortion direction corresponding to the synthetic keystone distortion is leftward, which indicates that the placement position of the projector deviates leftward, the first horizontal rotation direction of the transmission device is rightward, and the projector needs to rotate rightward for correction.
The first horizontal rotation angle is determined according to the first horizontal distortion angle and the distance between the plane where the projector projects the light and the plane where the target area is located. In general, in the case where the distance between the plane on which the projector projects the light and the plane on which the target area is located is determined, the larger the first horizontal distortion angle, the first horizontal rotation angle.
Referring to fig. 3, fig. 3 is a schematic projection diagram of a projector projecting to a target area according to an embodiment of the present disclosure, as shown in fig. 3, a projection content area in a projection image captured by an image capturing device may have three shapes after the projector projects to the target area, a left trapezoid in fig. 3 is the projection content area corresponding to a horizontal trapezoid, a middle trapezoid is the projection content area corresponding to a vertical trapezoid, and a right quadrangle is the projection content area corresponding to a synthetic trapezoid.
And 206, the projector control transmission device rotates the projector to the first target position according to the first horizontal rotation direction and the first horizontal rotation angle.
And 207, after the projector rotates to the first target position, the projector performs vertical keystone correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle.
In the embodiment of the present application, the first target position is a position where the projector does not have horizontal keystone distortion calculated by the projector. Step 206 may eliminate horizontal keystone distortion through the transmission.
After the horizontal keystone distortion is removed in step 206, a vertical keystone correction is performed in step 207.
Optionally, the projector performs vertical keystone correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle, specifically:
the projector determines an image correction parameter according to the first vertical distortion direction, the first vertical distortion angle and the distance between the plane of the projection light of the projector and the plane of the target area;
correcting an image signal received by a projector from a terminal device according to an image correction parameter to obtain a processed image signal, modulating the processed image signal by an optical modulation module in the projector to obtain modulated light, and projecting the modulated light to a target area by an optical projection module in the projector to form a projected image without distortion; wherein the boundary of the projected content area of the projected image without distortion is rectangular.
In the embodiment of the application, when detecting that there is synthetic keystone distortion in the projected image of projecting apparatus projection to the target area, at first rotate the projecting apparatus through transmission, rectify horizontal keystone distortion, then rectify vertical keystone distortion through vertical keystone correction algorithm, can synthesize keystone distortion automatically and rectify to can realize the keystone correction to vertical direction and horizontal direction.
Referring to fig. 4, fig. 4 is a schematic flowchart illustrating another trapezoidal correction method according to an embodiment of the present disclosure. As shown in fig. 4, the keystone correction method is applied to the projection system shown in fig. 1, and the keystone correction method may include the following steps.
The projector captures a projection image projected by the projector to the target area by the image pickup device 401.
The projector identifies a projected content region in the projected image 402.
The projector analyzes whether keystone distortion exists at the boundary of the projected content area 403. If yes, go to step 404 or step 408 or step 411, otherwise go to step 413.
Optionally, step 403 may include the following steps:
(11) the projector determines whether the boundary of the projected content area is a quadrangle;
(12) if the quadrangle is obtained, the projector acquires coordinates of four corners of the quadrangle and determines whether the quadrangle is rectangular or not according to the coordinates of the four corners of the quadrangle;
(13) if the quadrangle is not a rectangle, the projector determines that trapezoidal distortion exists;
(14) if the quadrilateral is a rectangle, the projector determines that keystone distortion is not present.
The embodiment of the application can judge whether trapezoidal distortion exists according to whether the boundary of the projection content area is rectangular.
If the boundary of the projection content area is quadrilateral and rectangular, the trapezoidal distortion is not considered to exist; if the boundary of the projected content area is a quadrilateral, but not a rectangle, keystone distortion is considered to be present.
If the quadrangle is not a rectangle and the quadrangle is a trapezoid, determining that the trapezoidal distortion is horizontal trapezoidal distortion or vertical trapezoidal distortion;
and if the quadrangle is not a rectangle, is not a parallelogram, and is not a trapezoid, determining that the trapezoidal distortion is the comprehensive trapezoidal distortion.
Optionally, step 403 may include the following steps:
(21) inputting a boundary image containing a projection content area into a trained pattern recognition model by the shadow machine to obtain a type recognition result of the boundary image of the projection content area;
(22) if the type of the boundary image of the projection content area is rectangular, the projector determines that trapezoidal distortion does not exist;
(23) if the type of the boundary image of the projection content area is a first trapezoid, determining that horizontal trapezoid distortion exists by the projector, and if the type of the boundary image of the projection content area is a second trapezoid, determining that vertical trapezoid distortion exists by the projector;
(24) if the type of the boundary image of the projection content area is a common quadrangle, the projector determines that the trapezoidal distortion is the comprehensive trapezoidal distortion.
In the embodiment of the application, the trained pattern recognition model is used for recognizing the shape of the boundary image containing the projection content area. The trained pattern recognition model can be used for recognizing the shape of a quadrangle, recognizing whether the quadrangle is trapezoid, recognizing whether the quadrangle is rectangle, and the like.
The trained image recognition model can be obtained by training a large number of quadrilateral pictures in advance, so that the recognition accuracy of the trained image recognition model exceeds a preset accuracy threshold.
The first trapezoid is an isosceles trapezoid parallel to the vertical direction, such as the leftmost trapezoid in fig. 3, which is the first trapezoid; the second type of trapezoid is an isosceles trapezoid parallel to the horizontal direction, such as the trapezoid in the middle of fig. 3, which is the second type of trapezoid; the ordinary quadrangle is neither trapezoid nor rectangle, nor parallelogram, such as the rightmost quadrangle in fig. 3, i.e. the ordinary quadrangle.
404, in a case where the keystone distortion is a synthetic keystone distortion, the projector determines a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction, and a first vertical distortion angle corresponding to the synthetic keystone distortion, and the synthetic keystone distortion includes a combination of the horizontal keystone distortion and the vertical keystone distortion.
The projector determines a first horizontal rotation direction and a first horizontal rotation angle of the actuator based on the first horizontal distortion direction and the first horizontal distortion angle 405.
406, the projector control actuator rotates the projector to a first target position according to a first horizontal rotation direction and a first horizontal rotation angle.
And 407, after the projector rotates to the first target position, the projector performs vertical keystone correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle.
In the embodiment of the present application, steps 404 to 407 are a synthetic keystone correction method in a case where synthetic keystone distortion exists at the boundary of the projection content area.
Optionally, after step 407 is executed, step 401 may be further executed to further verify the effect of the keystone correction. After the comprehensive trapezoidal correction, continuously identifying whether a projection content area in a projection image shot by the camera device has trapezoidal distortion or not, and if so, correcting by adopting the method from step 404 to step 407; if the horizontal keystone distortion exists, correcting by adopting the method from step 408 to step 410; if there is vertical keystone distortion, then the method of steps 411 to 412 is used for correction.
Optionally, after step 403 is executed, if keystone distortion exists, it is determined whether the number of times that keystone distortion is continuously detected exceeds a preset number threshold, and if so, stopping performing automatic correction, and performing correction in a manual correction manner. The manual correction is a method of manually measuring parameters of keystone distortion and inputting the measured parameters into the projector for correction. The preset number threshold may be preset and stored in a memory (e.g., a non-volatile memory) of the projector, and for example, the preset number threshold may be set to 10 times.
Generally, if the automatic correction is not successful for a plurality of times, indicating that the correction algorithm fails to correct the current keystone distortion, the correction needs to be performed manually.
408, in a case where the keystone distortion is present at the boundary of the projected content area and the keystone distortion is the horizontal keystone distortion, the projector determines a second horizontal distortion direction and a second horizontal distortion angle corresponding to the horizontal keystone distortion.
And 409, determining a second horizontal rotation direction and a second horizontal rotation angle of the transmission device by the projector according to the second horizontal distortion direction and the second horizontal distortion angle.
410, the projector control transmission device rotates the projector to a second target position according to a second horizontal rotation direction and a second horizontal rotation angle; after the projector is rotated to the second target position, step 411 is continued.
In the embodiment of the present application, steps 408 to 410 are a horizontal keystone correction method in a case where only horizontal keystone distortion exists at the boundary of the projected content area. The second target position is a position calculated by the projector where keystone distortion does not exist in the projector. The second target position is a different position than the first target position where the projector is located.
Optionally, after step 410 is executed, step 401 may be further executed to further verify the effect of the keystone correction. After the horizontal keystone correction, continuously identifying whether a projection content area in a projection image shot by the camera device has keystone distortion or not, and if the comprehensive keystone distortion exists, correcting by adopting the method from step 404 to step 407; if the horizontal keystone distortion exists, correcting by adopting the method from step 408 to step 410; if there is vertical keystone distortion, then the method of steps 411 to 412 is used for correction.
In a case where the keystone distortion is present at the boundary of the projected content area and the keystone distortion is vertical keystone distortion 411, the projector determines a third vertical distortion direction and a third vertical distortion angle corresponding to the vertical keystone distortion.
The projector performs vertical keystone correction on the image output by the projector according to the third vertical distortion direction and the third vertical distortion angle 412.
In the embodiment of the present application, steps 411 to 412 are a vertical keystone correction method in a case where only vertical keystone distortion exists at the boundary of the projected content area.
Optionally, after step 412 is executed, step 401 may also be executed continuously. After the vertical keystone correction, continuously identifying whether a projection content area in a projection image shot by the camera device has keystone distortion or not, and if the projection content area has comprehensive keystone distortion, correcting by adopting the method from step 404 to step 407; if the horizontal keystone distortion exists, correcting by adopting the method from step 408 to step 410; if there is vertical keystone distortion, then the method of steps 411 to 412 is used for correction.
413, the projector determines that the projector is projecting normally.
In the embodiment of the application, when the comprehensive trapezoidal distortion of the projection image projected to the target area by the projector is detected, the projector is rotated through the transmission device to correct the horizontal trapezoidal distortion, then the vertical trapezoidal distortion is corrected through the vertical trapezoidal correction algorithm, and the comprehensive trapezoidal distortion can be automatically corrected, so that the trapezoidal correction in the vertical direction and the trapezoidal correction in the horizontal direction can be realized; when detecting that a projection image projected to a target area by a projector has horizontal trapezoidal distortion, rotating the projector through a transmission device to correct the horizontal trapezoidal distortion; and when detecting that the projection image projected to the target area by the projector has vertical keystone distortion, correcting the vertical keystone distortion by using a vertical keystone correction algorithm.
The above description has introduced the solution of the embodiment of the present application mainly from the perspective of the method-side implementation process. It will be appreciated that the projector, in order to implement the above-described functions, includes corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the present application is capable of hardware or a combination of hardware and computer software implementing the various illustrative elements and algorithm steps described in connection with the embodiments provided herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. 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.
In the embodiment of the present application, the projector may be divided into the functional units according to the above method example, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
In accordance with the above, referring to fig. 5, fig. 5 is a schematic structural diagram of a trapezoidal correction apparatus 500 provided in an embodiment of the present application, where the trapezoidal correction apparatus 500 is applied to the projector system shown in fig. 1, the trapezoidal correction apparatus 500 may include a shooting unit 501, a recognition unit 502, an analysis unit 503, a determination unit 504, a control unit 505, and a trapezoidal correction unit 506, where:
a shooting unit 501 for shooting a projection image projected to a target area by the projector through an image pickup device;
an identification unit 502 for identifying a projected content area in the projected image;
an analyzing unit 503, configured to analyze whether or not a keystone distortion exists at a boundary of the projection content area;
a determining unit 504, configured to determine, when a keystone distortion exists at a boundary of the projection content area and the keystone distortion is a synthetic keystone distortion, a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction, and a first vertical distortion angle corresponding to the synthetic keystone distortion, where the synthetic keystone distortion includes a combination of horizontal keystone distortion and vertical keystone distortion;
the determining unit 504 is further configured to determine a first horizontal rotation direction and a first horizontal rotation angle of the transmission according to the first horizontal distortion direction and the first horizontal distortion angle;
a control unit 505, configured to control the transmission device to rotate the projector to a first target position according to the first horizontal rotation direction and the first horizontal rotation angle;
a keystone correction unit 506, configured to perform vertical keystone correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle after the projector rotates to the first target position.
Optionally, the determining unit 504 is further configured to determine that the projector projects normally when the keystone distortion does not exist at the boundary of the projection content area.
Optionally, the determining unit 504 is further configured to determine a second horizontal distortion direction and a second horizontal distortion angle corresponding to a horizontal keystone distortion when a keystone distortion exists at a boundary of the projection content area and the keystone distortion is the horizontal keystone distortion;
the determining unit 504 is further configured to determine a second horizontal rotation direction and a second horizontal rotation angle of the transmission according to the second horizontal distortion direction and the second horizontal distortion angle;
the control unit 505 is further configured to control the transmission device to rotate the projector to a second target position according to the second horizontal rotation direction and the second horizontal rotation angle;
the shooting unit 501 is further configured to shoot a projection image projected to a target area by the projector through an image capturing device after the projector is rotated to the second target position.
Optionally, the determining unit 504 is further configured to determine a third vertical distortion direction and a third vertical distortion angle corresponding to a vertical keystone distortion when a keystone distortion exists at a boundary of the projection content area and the keystone distortion is the vertical keystone distortion;
the keystone correction unit 506 is further configured to perform vertical keystone correction on the image output by the projector according to the third vertical distortion direction and the third vertical distortion angle.
Optionally, the analyzing unit 503 analyzes whether the boundary of the projection content area has keystone distortion, specifically: determining whether a boundary of the projected content area is a quadrilateral; if so, acquiring coordinates of four corners of the quadrangle, and determining whether the quadrangle is rectangular according to the coordinates of the four corners of the quadrangle; if the quadrangle is not a rectangle, determining that trapezoidal distortion exists; and if the quadrangle is a rectangle, determining that no trapezoidal distortion exists.
Optionally, if the quadrangle is not a rectangle and the quadrangle is a trapezoid, determining that the trapezoid distortion is a horizontal trapezoid distortion or a vertical trapezoid distortion;
and if the quadrangle is not a rectangle, is not a parallelogram, and is not a trapezoid, determining that the trapezoid distortion is the comprehensive trapezoid distortion.
Optionally, the analyzing unit 503 analyzes whether the boundary of the projection content area has keystone distortion, specifically: inputting the boundary image containing the projection content area into a trained pattern recognition model to obtain a type recognition result of the boundary image of the projection content area; if the type of the boundary image of the projection content area is a rectangle, determining that trapezoidal distortion does not exist; if the type of the boundary image of the projection content area is a first trapezoid, determining that horizontal trapezoid distortion exists, and if the type of the boundary image of the projection content area is a second trapezoid, determining that vertical trapezoid distortion exists; and if the type of the boundary image of the projection content area is a common quadrangle, determining that the trapezoidal distortion is comprehensive trapezoidal distortion.
The shooting unit 501 may correspond to a camera, and the recognition unit 502, the analysis unit 503, the determination unit 504, the control unit 505, and the trapezoidal correction unit 506 may correspond to a processor of a projector.
In the embodiment of the application, when detecting that there is synthetic keystone distortion in the projected image of projecting apparatus projection to the target area, at first rotate the projecting apparatus through transmission, rectify horizontal keystone distortion, then rectify vertical keystone distortion through vertical keystone correction algorithm, can synthesize keystone distortion automatically and rectify to can realize the keystone correction to vertical direction and horizontal direction.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a projector according to an embodiment of the present disclosure, as shown in fig. 6, the projector 600 includes a processor 601 and a memory 602, and the processor 601 and the memory 602 may be connected to each other through a communication bus 603. The communication bus 603 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus 604 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 6, but this is not intended to represent only one bus or type of bus. The memory 602 is used for storing a computer program comprising program instructions, the processor 601 being configured for invoking the program instructions, the program comprising instructions for performing the method shown in fig. 1 to 4.
The processor 601 may be a general purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs according to the above schemes.
The Memory 602 may be a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to these. The memory may be self-contained and coupled to the processor via a bus. The memory may also be integral to the processor.
The projector 600 may further include a light source module, an image processing module, an optical modulation module, and an optical projection module. The projector 600 may also include common components such as a display screen, a communication interface, etc., which will not be described in detail herein.
In the embodiment of the application, when detecting that there is synthetic keystone distortion in the projected image of projecting apparatus projection to the target area, at first rotate the projecting apparatus through transmission, rectify horizontal keystone distortion, then rectify vertical keystone distortion through vertical keystone correction algorithm, can synthesize keystone distortion automatically and rectify to can realize the keystone correction to vertical direction and horizontal direction.
Embodiments of the present application also provide a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute part or all of the steps of any one of the keystone correction methods as described in the above method embodiments.
Embodiments of the present application also provide a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program causes a computer to execute part or all of the steps of any one of the trapezoid correction methods as described in the above method embodiments.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may be implemented in the form of a software program module.
The integrated units, if implemented in the form of software program modules and sold or used as stand-alone products, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a memory, and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned memory comprises: various media capable of storing program codes, such as a usb disk, a read-only memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and the like.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash memory disks, read-only memory, random access memory, magnetic or optical disks, and the like.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A keystone correction method applied to a projector system including a projector, an image pickup device, and an actuator, the method comprising:
shooting a projection image projected to a target area by the projector through a camera device;
identifying a projected content region in the projected image;
analyzing whether keystone distortion exists at the boundary of the projection content area;
determining a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction and a first vertical distortion angle corresponding to the comprehensive keystone distortion under the condition that the keystone distortion exists at the boundary of the projection content area and the keystone distortion is the comprehensive keystone distortion, wherein the comprehensive keystone distortion comprises the combination of the horizontal keystone distortion and the vertical keystone distortion;
determining a first horizontal rotation direction and a first horizontal rotation angle of the transmission according to the first horizontal distortion direction and the first horizontal distortion angle;
controlling the transmission device to rotate the projector to a first target position according to the first horizontal rotation direction and the first horizontal rotation angle;
and after the projector rotates to the first target position, performing vertical keystone correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle.
2. The method of claim 1, further comprising:
and if the trapezoid distortion does not exist on the boundary of the projection content area, determining that the projector projects normally.
3. The method of claim 2, further comprising:
determining a second horizontal distortion direction and a second horizontal distortion angle corresponding to the horizontal keystone distortion when keystone distortion exists at the boundary of the projection content area and the keystone distortion is horizontal keystone distortion;
determining a second horizontal rotation direction and a second horizontal rotation angle of the transmission according to the second horizontal distortion direction and the second horizontal distortion angle;
controlling the transmission device to rotate the projector to a second target position according to the second horizontal rotation direction and the second horizontal rotation angle;
the step of capturing a projection image projected to a target area by the projector through an image capturing device is performed after the projector is rotated to the second target position.
4. The method of claim 2, further comprising:
determining a third vertical distortion direction and a third vertical distortion angle corresponding to the vertical keystone distortion when keystone distortion exists at the boundary of the projection content area and the keystone distortion is vertical keystone distortion;
and performing vertical keystone correction on the image output by the projector according to the third vertical distortion direction and the third vertical distortion angle.
5. The method of any of claims 1 to 4, wherein the analyzing whether keystone distortion exists at the boundary of the projected content area comprises:
determining whether a boundary of the projected content area is a quadrilateral;
if so, acquiring coordinates of four corners of the quadrangle, and determining whether the quadrangle is rectangular according to the coordinates of the four corners of the quadrangle;
if the quadrangle is not a rectangle, determining that trapezoidal distortion exists;
and if the quadrangle is a rectangle, determining that no trapezoidal distortion exists.
6. The method according to claim 5, wherein if the quadrangle is not a rectangle and the quadrangle is a trapezoid, determining that the trapezoid distortion is a horizontal trapezoid distortion or a vertical trapezoid distortion;
and if the quadrangle is not a rectangle, is not a parallelogram, and is not a trapezoid, determining that the trapezoid distortion is the comprehensive trapezoid distortion.
7. The method of any of claims 1 to 4, wherein the analyzing whether keystone distortion exists at the boundary of the projected content area comprises:
inputting the boundary image containing the projection content area into a trained pattern recognition model to obtain a type recognition result of the boundary image of the projection content area;
if the type of the boundary image of the projection content area is a rectangle, determining that trapezoidal distortion does not exist;
if the type of the boundary image of the projection content area is a first trapezoid, determining that horizontal trapezoid distortion exists, and if the type of the boundary image of the projection content area is a second trapezoid, determining that vertical trapezoid distortion exists;
and if the type of the boundary image of the projection content area is a common quadrangle, determining that the trapezoidal distortion is comprehensive trapezoidal distortion.
8. A keystone correction apparatus, wherein the keystone correction apparatus is applied to a projector system, the projector system including a projector, a camera, and a transmission, the keystone correction apparatus comprising:
a shooting unit for shooting a projection image projected to a target area by the projector through a camera;
an identification unit configured to identify a projection content area in the projection image;
an analysis unit configured to analyze whether or not trapezoidal distortion exists at a boundary of the projected content area;
a determining unit, configured to determine a first horizontal distortion direction, a first horizontal distortion angle, a first vertical distortion direction, and a first vertical distortion angle corresponding to a synthetic keystone in a case where a keystone distortion exists at a boundary of the projection content area and the keystone distortion is a synthetic keystone distortion, where the synthetic keystone distortion includes a combination of a horizontal keystone distortion and a vertical keystone distortion;
the determining unit is further used for determining a first horizontal rotating direction and a first horizontal rotating angle of the transmission device according to the first horizontal distortion direction and the first horizontal distortion angle;
the control unit is used for controlling the transmission device to rotate the projector to a first target position according to the first horizontal rotation direction and the first horizontal rotation angle;
and the trapezoidal correction unit is used for performing vertical trapezoidal correction on the image output by the projector according to the first vertical distortion direction and the first vertical distortion angle after the projector rotates to the first target position.
9. A projector comprising a processor and a memory, the memory for storing a computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the method of any of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer storage medium stores a computer program comprising program instructions that, when executed by a processor, cause the processor to carry out the method according to any one of claims 1 to 7.
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| CN201910937156.5A CN110809141A (en) | 2019-09-29 | 2019-09-29 | Trapezoidal correction method and device, projector and storage medium |
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| CN201910937156.5A CN110809141A (en) | 2019-09-29 | 2019-09-29 | Trapezoidal correction method and device, projector and storage medium |
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