CN113938661B - Projector side projection correction method, terminal equipment and storage medium - Google Patents
Projector side projection correction method, terminal equipment and storage medium Download PDFInfo
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- CN113938661B CN113938661B CN202111147260.8A CN202111147260A CN113938661B CN 113938661 B CN113938661 B CN 113938661B CN 202111147260 A CN202111147260 A CN 202111147260A CN 113938661 B CN113938661 B CN 113938661B
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- 238000012937 correction Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004364 calculation method Methods 0.000 claims abstract description 27
- 238000004590 computer program Methods 0.000 claims description 19
- 238000013507 mapping Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 6
- 230000006870 function Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001413 cellular effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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Classifications
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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
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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]
- H04N9/3191—Testing thereof
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Projection Apparatus (AREA)
Abstract
The invention relates to a projector side projection correction method, a terminal device and a storage medium, wherein the method comprises the following steps: s1: calculating a rotation compensation angle; s2: acquiring n groups of projection pictures projected by known side projection correction angles and the distance between the side projection correction angles and the wall surface, and rotating according to the rotation compensation angle; s3: extracting coordinates of two angular points in the projection photo, and calculating corresponding parameters of each group: s4: obtaining a final side projection correction angle calculation formula according to the corresponding parameters of each group; s5: acquiring a projection picture projected on a projection plane to be detected, and extracting coordinates of two corner points after rotation; s6: calculating a side projection correction angle corresponding to the projection plane to be measured through a final side projection correction angle calculation formula, coordinates of two corner points and a wall distance; s7: and correcting the projector according to the side projection correction angle. The invention enables a user to finish automatic trapezoid correction without manually adjusting the keystone.
Description
Technical Field
The present invention relates to the field of projector correction, and in particular, to a projector side projection correction method, a terminal device, and a storage medium.
Background
A projector is a device for projecting images or videos onto a curtain, and is widely used in homes, offices, schools, and entertainment venues. The trapezoid correction of the existing home projector is generally regulated and corrected by using a special chip, and is divided into manual and automatic. The manual condition user needs to project the projector perpendicular to the wall surface, the sensor records current angle information, the user moves to the angle of target projection again, the sensor records angle change information, the included angle between the projector and the wall surface is calculated, the gravity sensor is combined to obtain the angle change of the gravity direction, and the angle change is input into the trapezoidal correction chip together to perform trapezoidal correction. The manual operation user experience is poor. The automatic correction is generally carried out by external equipment, such as a common camera, for example, by shooting a projection picture so as to calculate the wall surface included angle, but the calculation formula is complex; or the multi-point distance detection function of the TOF camera is used for directly calculating the wall surface included angle, but the TOF camera has higher cost than a common camera and short effective distance, and cannot meet the calculation of the projected wall surface included angle beyond 2 meters.
Disclosure of Invention
In order to solve the problems, the invention provides a projector side projection correction method, a terminal device and a storage medium, so as to meet the calculation of an included angle in projection outside a distance of 2 meters.
The specific scheme is as follows:
A projector side projection correction method comprising the steps of:
S1: calculating a rotation compensation angle of the projector according to the projection picture when the projector projects forward;
S2: obtaining n groups of projection photos projected by known side projection correction angles, wherein each group comprises three projection photos, and rotating the projection photos according to a rotation compensation angle;
S3: extracting coordinates of two angular points in the rotated projection photos according to the rotated projection photos, and calculating according to the coordinates of the two angular points corresponding to the three projection photos in each group to obtain parameters c 1、c2 and c 3 in a corresponding side projection correction angle calculation formula of each group:
x1＝Dx1-Ax1
x2＝Dx2-Ax2
x3＝Dx3-Ax3
y1＝tan(β1/180·π)
y2＝tan(β2/180·π)
y3＝tan(β3/180·π)
Wherein a and D respectively represent two angular points, a x1 and D x1 respectively represent x-axis coordinates of the two angular points a and D in the first projection photo in each group, a x2 and D x2 respectively represent x-axis coordinates of the two angular points a and D in the second projection photo in each group, a x3 and D x3 respectively represent x-axis coordinates of the two angular points a and D in the third projection photo in each group, x 1、x2、x3、y1、y2、y3 are intermediate parameters, β 1、β2 and β 3 respectively represent three side projection correction angles in each group, and z 1、z2、z3 respectively represents distances from three projectors in each group to a wall surface;
S4: obtaining a final side projection correction angle calculation formula according to parameters c 1、c2 and c 3 in the side projection correction angle calculation formula corresponding to each group:
wherein, beta represents a side projection correction angle, A x and D x respectively represent x-axis coordinates of two corner points A and D, and z 0 represents a distance from a projector to a wall surface;
s5: acquiring a projection picture projected by a projector on a projection plane to be detected, rotating the projection picture according to a rotation compensation angle, and extracting coordinates of two corner points A and D in the rotated projection picture;
S6: calculating a side projection correction angle corresponding to the projection plane to be measured through a final side projection correction angle calculation formula, coordinates of the two corner points A and D obtained in the step S5 and the distance between the projector and the wall surface;
S7: and correcting the projector according to the side projection correction angle.
Further, in step S1, the rotation compensation angle is obtained by calculating coordinates of two corner points in the projection photograph when the projector projects forward.
Further, in step S1, the calculation formula of the rotation compensation angle angleOffset is:
wherein a x and D x respectively represent x-axis coordinates of two corner points a and D, a y and D y respectively represent y-axis coordinates of two corner points a and D, which are upper left and upper right corners of a mapping window in a projection photo.
Further, when n is greater than 1, in step S4, the values of the n sets of corresponding parameters c 1、c2 and c 3 are averaged to obtain the parameters in the final side projection correction angle calculation formula.
Further, the two corner points are the upper left corner and the upper right corner of the mapping window in the projection photo.
A projector comprising a processor, a memory and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to an embodiment of the invention when the computer program is executed.
A computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method described above for embodiments of the present invention.
According to the technical scheme, when a user changes the pose of the projector and changes the included angle between the projector and the projection wall surface, the method can be automatically called to acquire a new side projection correction angle, and the projection picture is corrected, so that the user can finish automatic trapezoid correction without manually adjusting the keystone.
Drawings
Fig. 1 is a flowchart of a first embodiment of the present invention.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention.
The invention will now be further described with reference to the drawings and detailed description.
Embodiment one:
The embodiment of the invention provides a projector side projection correction method, as shown in fig. 1, comprising the following steps:
s1: the rotation compensation angle of the projector is calculated from the projection photograph of the projector when the projector is projecting forward.
The correction angle of the forward projection, i.e. the side projection, is 0, i.e. the projector optical axis is perpendicular to the projection plane. The projection surface is a surface for displaying the projection image, and when the projection surface is directly projected to the wall surface for display, the projection surface is the wall surface; when the projection screen is projected to the projection screen for display, the projection surface is the projection screen.
The projection photograph is a photograph obtained by projecting a picture by a normal camera.
Due to the process assembly problem, in actual projection, a rotation angle around the optical axis direction may be generated, and in order to eliminate the influence of the rotation angle, a rotation compensation angle needs to be calculated in advance to compensate for the subsequent projection photograph.
In this embodiment, the rotation compensation angle angleOffset is obtained by calculating coordinates of two corner points in a projection photo when the projector projects forward, and a specific calculation formula is as follows:
wherein a x and D x respectively represent x-axis coordinates of two corner points a and D, a y and D y respectively represent y-axis coordinates of two corner points a and D, which are upper left and upper right corners of a mapping window in a projection photo.
In other embodiments, two different corner points, such as the upper left corner and the lower left corner, may be used, without limitation.
S2: obtaining n groups of projection photographs projected by known side projection correction angles, wherein each group comprises three projection photographs; and rotates the projection photograph according to the rotation compensation angle.
In the implementation, three side projection correction angles are taken as a group, and after the three side projection correction angles are projected to a projection surface through a projector in n groups of side projection correction angles, three projection photos corresponding to each group of side projection correction angles are obtained. n=1, 2,3, …
The side projection correction angle is the included angle of the projection surface relative to the projection surface during forward projection.
S3: extracting coordinates of two angular points in the rotated projection photos according to the rotated projection photos, and calculating according to the coordinates of the two angular points corresponding to the three projection photos in each group to obtain parameters c 1、c2 and c 3 in a corresponding side projection correction angle calculation formula of each group:
x1＝Dx1-Ax1
x2＝Dx2-Ax2
x3＝Dx3-Ax3
y1＝tan(β1/180·π)
y2＝tan(β2/180·π)
y3＝tan(β3/180·π)
Wherein a and D respectively represent two angular points, a x1 and D x1 respectively represent x-axis coordinates of the two angular points a and D in the first projection photo in each group, a x2 and D x2 respectively represent x-axis coordinates of the two angular points a and D in the second projection photo in each group, a x3 and D x3 respectively represent x-axis coordinates of the two angular points a and D in the third projection photo in each group, x 1、x2、x3、y1、y2、y3 are intermediate parameters, β 1、β2 and β 3 respectively represent three side projection correction angles in each group, and z 1、z2、z3 respectively represents distances from three projectors in each group to a wall surface.
S4: obtaining a final side projection correction angle calculation formula according to parameters c 1、c2 and c 3 in the side projection correction angle calculation formula corresponding to each group:
where β represents the side throw correction angle, a x and D x represent the x-axis coordinates of the two corner points a and D, respectively, and z 0 represents the projector-to-wall distance (given by TOF).
Since there is a certain error in accuracy when only one set of data is used to obtain the final side projection correction angle calculation formula, n=3 is preferably set in this embodiment in order to reduce the error while considering the efficiency problem, and the average value of the three sets of obtained parameters is used as parameters c 1、c2 and c 3 in the final side projection correction angle calculation formula.
S5: and acquiring a projection picture projected by the projector on the projection plane to be detected, rotating the projection picture according to the rotation compensation angle, and extracting coordinates of two corner points A and D in the rotated projection picture.
It should be noted that, the two corner points extracted in the projection plane to be detected need to correspond to the two corner points extracted in step S3, for example, in this embodiment, the upper left corner and the upper right corner of the mapping window in the projection photo are both extracted.
S6: and (5) calculating the side projection correction angle corresponding to the projection plane to be measured through a final side projection correction angle calculation formula, the coordinates of the two corner points A and D obtained in the step S5 and the distance between the projector and the wall surface.
S7: and correcting the projector according to the side projection correction angle.
The derivation process of the calculation formula of the side projection correction angle in this embodiment is as follows:
The calculation formula of the side projection correction angle beta obtained according to the coordinates of the two corner points A and D and the distance z 0 between the projector and the wall surface is as follows:
Wherein dx and dy respectively represent pixel sizes in the x-axis direction and the y-axis direction, s represents a ratio of a projection picture width to a pattern width in the projection picture, t represents transmittance, θ represents an elevation angle of a projector, α represents a horizontal view field half angle of a projection optical machine, p represents a dotting scale factor, z 0 represents a distance from the optical machine to a wall surface, r represents a camera elevation angle, and t x、ty、tz respectively represents relative translation positions of axes of the optical machine and the camera in x, y and z axes.
Because of the difficulty in measuring part of parameters in engineering practice and the small influence of (D y-Ay) on the beta value by actual measurement, the parameter can be used as a fixed parameter, and then a simplified solution formula of the side projection correction angle beta is obtained:
When the method provided by the embodiment of the invention is adopted, when a user changes the pose of the projector and changes the included angle between the projector and the projection wall surface, the method can be automatically called to acquire a new side projection correction angle, and the projection picture is corrected, so that the user can finish automatic trapezoidal correction without manually adjusting the keystone.
Embodiment two:
The invention also provides a projector, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the steps in the method embodiment of the first embodiment of the invention are realized when the processor executes the computer program.
Further, as an executable scheme, the Processor may be a central processing unit (Central Processing Unit, CPU), other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that is the control center of the projector, connecting the various parts of the overall projector using various interfaces and lines.
The memory may be used to store the computer program and/or modules, and the processor may implement various functions of the projector by running or executing the computer program and/or modules stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the cellular phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart memory card (SMART MEDIA CARD, SMC), secure Digital (SD) card, flash memory card (FLASH CARD), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
The present invention also provides a computer readable storage medium storing a computer program which when executed by a processor implements the steps of the above-described method of an embodiment of the present invention.
The projector integrated modules/units may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as a stand alone product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a software distribution medium, and so forth.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A projector side projection correction method, comprising the steps of:
S1: calculating a rotation compensation angle of the projector according to the projection picture when the projector projects forward;
S2: obtaining n groups of projection photos projected by known side projection correction angles, wherein each group comprises three projection photos, and rotating the projection photos according to a rotation compensation angle;
S3: extracting coordinates of two angular points in the rotated projection photos according to the rotated projection photos, and calculating according to the coordinates of the two angular points corresponding to the three projection photos in each group to obtain parameters c 1、c2 and c 3 in a corresponding side projection correction angle calculation formula of each group:
x1＝Dx1-Ax1
x2＝Dx2-Ax2
x3＝Dx3-Ax3
y1＝tan(β1/180·π)
y2＝tan(β2/180·π)
y3＝tan(β3/180·π)
Wherein a and D respectively represent two angular points, a x1 and D x1 respectively represent x-axis coordinates of the two angular points a and D in the first projection photo in each group, a x2 and D x2 respectively represent x-axis coordinates of the two angular points a and D in the second projection photo in each group, a x3 and D x3 respectively represent x-axis coordinates of the two angular points a and D in the third projection photo in each group, x 1、x2、x3、y1、y2、y3 are intermediate parameters, β 1、β2 and β 3 respectively represent three side projection correction angles in each group, and z 1、z2、z3 respectively represents distances from three projectors in each group to a wall surface;
S4: obtaining a final side projection correction angle calculation formula according to parameters c 1、c2 and c 3 in the side projection correction angle calculation formula corresponding to each group:
wherein, beta represents a side projection correction angle, A x and D x respectively represent x-axis coordinates of two corner points A and D, and z 0 represents a distance from a projector to a wall surface;
s5: acquiring a projection picture projected by a projector on a projection plane to be detected, rotating the projection picture according to a rotation compensation angle, and extracting coordinates of two corner points A and D in the rotated projection picture;
S6: calculating a side projection correction angle corresponding to the projection plane to be measured through a final side projection correction angle calculation formula, coordinates of the two corner points A and D obtained in the step S5 and the distance between the projector and the wall surface;
S7: and correcting the projector according to the side projection correction angle.
2. The projector side-projection correction method according to claim 1, wherein: the rotation compensation angle in step S1 is obtained by calculation of coordinates of two corner points in the projection photograph at the time of forward projection of the projector.
3. The projector side-projection correction method according to claim 2, wherein: the calculation formula of the rotation compensation angle angleOffset in step S1 is:
wherein a x and D x respectively represent x-axis coordinates of two corner points a and D, a y and D y respectively represent y-axis coordinates of two corner points a and D, which are upper left and upper right corners of a mapping window in a projection photo.
4. The projector side-projection correction method according to claim 1, wherein: and when n is greater than 1, in the step S4, the values of the parameters c 1、c2 and c 3 corresponding to the n groups are averaged and then used as parameters in a final side casting correction angle calculation formula.
5. The projector side-projection correction method according to claim 1, wherein: the two corner points are the upper left corner and the upper right corner of the mapping window in the projection photo.
6. A projector, characterized in that: comprising a processor, a memory and a computer program stored in the memory and running on the processor, which processor, when executing the computer program, carries out the steps of the method according to any one of claims 1 to 5.
7. A computer-readable storage medium storing a computer program, characterized in that: the computer program implementing the steps of the method according to any one of claims 1 to 5 when executed by a processor.
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