CN110456602A - A kind of projection pattern means for correcting of optical projection system, method and system - Google Patents
A kind of projection pattern means for correcting of optical projection system, method and system Download PDFInfo
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- CN110456602A CN110456602A CN201910779845.8A CN201910779845A CN110456602A CN 110456602 A CN110456602 A CN 110456602A CN 201910779845 A CN201910779845 A CN 201910779845A CN 110456602 A CN110456602 A CN 110456602A
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- distance
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- distance measuring
- measuring sensor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/147—Optical correction of image distortions, e.g. keystone
Abstract
The invention discloses a kind of projection pattern means for correctings of optical projection system, method and system, the first distance measuring sensor on panel and the second distance measuring sensor, the Inertial Measurement Unit being set in projector, the processor connecting with the output end of the first distance measuring sensor, the second distance measuring sensor and Inertial Measurement Unit are controlled before projector including being set to, the line of the first distance measuring sensor and the second distance measuring sensor is not orthogonal to horizontal line.The present invention is by pre-establishing the relative position information between projector and curtain and the mapping table between projected picture size, when the projected picture to projector is corrected, processor matches corresponding target projection screen size according to the first distance measuring sensor, first distance, second distance and the angle that the second distance measuring sensor and Inertial Measurement Unit obtain respectively and the mapping table pre-established, so that the projected picture of projector is corrected rectangular frame according to the projected picture size, structure design is simple, cost is relatively low.
Description
Technical field
The present embodiments relate to projection device technical fields, correct more particularly to a kind of projection pattern of optical projection system
Device, method and system.
Background technique
In the routine use of projector, the position of projector will just can guarantee projection at right angle with projection screen as far as possible
Effect, if not can guarantee the vertical of the two, projected picture will generate trapezoidal.In this case, user needs using throwing
" trapezoid correction function " on shadow instrument is trapezoidal to correct, to guarantee that picture becomes the rectangle of standard.
Projector would generally have certain pitch angle in vertical direction in use, to make projected picture in Vertical Square
To trapezoidal deformation is generated, current projector all has the trapezoid correction function of vertical direction, generallys use optics keystone
The keystone of vertical direction is carried out with the method for digital keystone, wherein optics keystone refers to by adjusting camera lens
Physical location come achieve the purpose that adjustment it is trapezoidal, digital keystone is to realize keystone by the method for software.
But projector can also exist and because of the biasing of horizontal position generate trapezoidal, the prior art in practical applications
In usually taken pictures by Camera to projection pattern, it is then trapezoidal by carrying out horizontal direction after the analysis to pattern again
Correction, design is complicated, at high cost, and requires the processing capacity of CPU also higher.
In consideration of it, how to provide, a kind of design structure is simple, cost is relatively low, and requires lower throwing to CPU processing capacity
The projection pattern means for correcting of shadow system, method and system become those skilled in the art's problem to be solved.
Summary of the invention
The purpose of the embodiment of the present invention is that providing a kind of projection pattern means for correcting of optical projection system, method and system, tie
Structure design is simple, cost is relatively low, and lower to the requirement of CPU processing capacity in use, and the scope of application is more extensive.
In order to solve the above technical problems, the embodiment of the invention provides a kind of projection pattern means for correcting of optical projection system,
It include: to control the first distance measuring sensor on panel before being set to projector and the second distance measuring sensor, be set in projector
Inertial Measurement Unit, the output with first distance measuring sensor, second distance measuring sensor and the Inertial Measurement Unit
The line of the processor of end connection, first distance measuring sensor and second distance measuring sensor is not orthogonal to horizontal line, institute
Stating Inertial Measurement Unit includes gyroscope and accelerometer, in which:
First distance measuring sensor, for the first distance between acquisition and curtain；
Second distance measuring sensor, for obtaining the second distance between the curtain；
The Inertial Measurement Unit, for obtaining the projector and the curtain in the angle of vertical direction；
The processor, for according to the first distance, second distance and the angle from the opposite position pre-established
Confidence ceases target projection screen size corresponding with matching in the mapping table of projected picture size, and according to the target
Projected picture size is corrected the projected picture of the projector, makes the projected picture rectangular frame of the projector；
Wherein, the relative position information between the projector and the curtain is according to the first distance, second distance and described
What angle obtained.
Optionally, the processor is also used to the control when the acceleration value that the accelerometer exports is greater than preset threshold
First distance measuring sensor, second distance measuring sensor and the Inertial Measurement Unit is made to start to work.
Optionally, the line of first distance measuring sensor and second distance measuring sensor passes through the projector lens
Center.
Optionally, first distance measuring sensor, the center of the projector lens and second distance measuring sensor it
Between line be parallel to horizontal line.
The embodiment of the present invention has also been correspondingly improved a kind of projection pattern bearing calibration of optical projection system, is applied to as above-mentioned
The projection pattern means for correcting, comprising:
Receive the first distance between curtain, second distance measuring sensor hair that first distance measuring sensor is sent
Projector that the second distance between curtain and the Inertial Measurement Unit sent is sent and curtain vertical direction angle,
The Inertial Measurement Unit includes gyroscope and accelerometer；
According to the first distance, second distance and the angle from the relative position information and projected picture pre-established
Corresponding target projection screen size is matched in the mapping table of size；Wherein, between the projector and the curtain
Relative position information obtained according to the first distance, second distance and the angle；
The projected picture of the projector is corrected according to the target projection screen size, makes the projector
Projected picture is rectangular frame.
Optionally, the Inertial Measurement Unit includes gyroscope and accelerometer；
The method also includes:
When the acceleration value of accelerometer output is greater than preset threshold, first distance measuring sensor and institute are controlled
State the start-up operation of the second distance measuring sensor.
The embodiment of the invention also provides a kind of projection patterns of optical projection system to correct system, comprising:
Receiving module, for receiving the first distance between curtain that first distance measuring sensor sends, described the
The projector of the second distance between curtain and Inertial Measurement Unit transmission that two distance measuring sensors are sent and curtain exist
The angle of vertical direction；
Matching module, for according to the first distance, second distance and the angle from the relative position pre-established
Corresponding target projection screen size is matched in information and the mapping table of projected picture size；Wherein, the projector
Relative position information between the curtain is obtained according to the first distance, second distance and the angle；
Calibration module, for being corrected according to the target projection screen size to the projected picture of the projector,
Make the projected picture rectangular frame of the projector.
The embodiment of the invention provides a kind of projection pattern means for correctings of optical projection system, method and system, comprising: setting
The first distance measuring sensor and the second distance measuring sensor on panel, the inertia measurement list being set in projector are controlled before projector
Member, the processor being connect with the output end of the first distance measuring sensor, the second distance measuring sensor and Inertial Measurement Unit, the first ranging
The line of sensor and the second distance measuring sensor is not orthogonal to horizontal line, and Inertial Measurement Unit includes gyroscope and accelerometer.
The embodiment of the present invention is by pre-establishing the relative position information between projector and curtain and pair between projected picture size
Relation table is answered, and when the projected picture to projector is corrected, processor can be according to be arranged in projector
First distance, second distance and the projector that one distance measuring sensor, the second distance measuring sensor and Inertial Measurement Unit obtain respectively
With curtain in the angle of vertical direction and the mapping table pre-established, match corresponding with this group of parameter currently measured
Projected picture size, and projected picture shape and design parameter are capable of determining that according to the projected picture size, thus according to this
The shape and parameter of projected picture are corrected the projected picture of projector, so as to projected picture of the projector on curtain with
The form of rectangular frame is presented, and apparatus structure design provided herein is simple, cost is relatively low, and to CPU processing capacity
It is required that lower, the scope of application is more extensive.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the projection pattern means for correcting of optical projection system provided in an embodiment of the present invention；
Fig. 2 is a kind of preceding control panel construction schematic diagram provided in an embodiment of the present invention；
Fig. 3 is another preceding control panel construction schematic diagram provided in an embodiment of the present invention；
Fig. 4 is that a kind of light of projector's horizontal direction provided in an embodiment of the present invention propagates schematic diagram；
Fig. 5 is a kind of flow diagram of the projection pattern bearing calibration of optical projection system provided in an embodiment of the present invention；
Fig. 6 is that a kind of projection pattern of optical projection system provided in an embodiment of the present invention corrects the structural schematic diagram of system.
Specific embodiment
The embodiment of the invention provides a kind of projection pattern means for correcting of optical projection system, method and system, structure designs
Simply, cost is relatively low, and lower to the requirement of CPU processing capacity in use, and the scope of application is more extensive.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of structure of the projection pattern means for correcting of optical projection system provided in an embodiment of the present invention
Schematic diagram.
The projection pattern means for correcting, comprising: be set to and control the first distance measuring sensor 2 on panel 1 and the before projector
Two distance measuring sensors 3, the Inertial Measurement Unit 4 being set in projector and the first distance measuring sensor 2, the second distance measuring sensor 3
The line of the processor 5 connected with the output end of Inertial Measurement Unit 4, the first distance measuring sensor 2 and the second distance measuring sensor 3 is not
Perpendicular to horizontal line, Inertial Measurement Unit 4 includes gyroscope and accelerometer, in which:
First distance measuring sensor 2, for the first distance between acquisition and curtain；
Second distance measuring sensor 3, for the second distance between acquisition and curtain；
Inertial Measurement Unit 4, for obtaining projector and curtain in the angle of vertical direction；
Processor 5, for according to first distance, second distance and angle from the relative position information and projection pre-established
Corresponding target projection screen size is matched in the mapping table of screen size, and according to target projection screen size to throwing
The projected picture of shadow machine is corrected, and makes the projected picture rectangular frame of projector；Wherein, the phase between projector and curtain
Location information is obtained according to first distance, second distance and angle.
It should be noted that the first distance measuring sensor 2 in the present embodiment obtained is the distance between itself and curtain
Information (namely first distance), the second distance measuring sensor 3 obtain be the distance between itself and curtain information (namely second away from
From), and panel 1, and projector are controlled since the first distance measuring sensor 2 and the second distance measuring sensor 3 are set to before projector
Camera lens controls panel 1 before being also disposed at projector, so being capable of determining that projector with respect to curtain by first distance and second distance
Horizontal position, and Inertial Measurement Unit 4 can obtain projector and curtain in the angle of vertical direction, can also be thrown
Upright position of the shadow machine relative to curtain.
Since when projector changes with respect to the position of curtain, projected picture shape of the projector on curtain will be sent out
Variation is sent, so (specially 6 freely for being equipped with the first distance measuring sensor 2, the second distance measuring sensor 3 and Inertial Measurement Unit 4
Spend Inertial Measurement Unit) projector (the first distance measuring sensor 2, the second distance measuring sensor 3 and Inertial Measurement Unit 4 are projecting
Position on machine is fixed), the relative position changed between projector and curtain can be first passed through in advance, obtained first at each position
The data information and corresponding projected picture that distance measuring sensor 2, the second distance measuring sensor 3 and Inertial Measurement Unit 4 measure respectively
Size to obtain the corresponding relationship of multiple groups relative position information Yu projected picture size, and establishes corresponding mapping table,
And the mapping table is stored into memory, wherein each relative position information includes one group of first distance, second distance
With angle data parameters.
In the use process of projector, it can be surveyed by the first distance measuring sensor 2, the second distance measuring sensor 3 and inertia
Amount unit 4 obtains first distance, second distance and projector and curtain in the angle of vertical direction, thus according to this group of number respectively
Matched from the mapping table of the relative position of the projector and curtain pre-established and projected picture size according to parameter with
The corresponding projected picture size of this group of data parameters, and as target projection screen size, processor 5 can be to the target
Projected picture size is analyzed, and determines the distortion situation of projected picture, thus image export to projector, before display
Adjusting Shape and supplement are carried out, to make the image shown on curtain in rectangle effect, it is seen that the application can realize automatically
Two-way keystone.Wherein, processing implement body can by distorted projection picture corresponding with target projection screen size into
After row analysis, the image before display is adjusted and is compensated using difference arithmetic, it is of course also possible to use at other images
Reason method, specific the application do not do particular determination, can be realized the purpose of the application.
Further, processor 5 in the present embodiment is also used to be greater than preset threshold when the acceleration value of accelerometer output
When, it controls the first distance measuring sensor 2 and the second distance measuring sensor 3 is started to work.
It should be noted that can determine projector by acceleration value that accelerometer detects in practical applications
Whether move, can specifically be compared acceleration value with preset threshold, is said when acceleration value is greater than preset threshold
Bright projector moves, then processor 5 can control the first distance measuring sensor 2 at this time and the second distance measuring sensor 3 starts work
Make, namely measure itself the distance between to curtain, first distance and second distance is respectively obtained, for subsequent to shadowgraph
Face is corrected.That is, being carried out corrected to projected picture in the application after detecting that projector moves
Work, to ensure that projected picture of the projector on curtain shows rectangle effect.
It further, can be with the first distance measuring sensor 2 and second in the present embodiment in order to keep structure design simpler
The line of distance measuring sensor 3 passes through the center of projector lens 11.It can also make the first distance measuring sensor in specific design, throw
Line between the center and the second distance measuring sensor of shadow machine camera lens is parallel to horizontal line, specifically referring to figure 3., at this point, by
The first distance d1 and second distance d2 and level side, projector that one distance measuring sensor 2 and the measurement of the second distance measuring sensor 3 obtain
To light to propagate schematic diagram as shown in Figure 4, wherein A indicates that curtain, d indicate between 11 center of projector lens and curtain
Distance, X and Y respectively indicate between 11 center of the first distance measuring sensor 2 and the second distance measuring sensor 3 and projector lens away from
From α indicates projector lens 11 and curtain angle in the horizontal direction.
In addition, it should also be noted that, the Inertial Measurement Unit 4 in the present embodiment can be set in projector in addition to preceding
Any position except panel 1 is controlled, so as to reduce the reserved space on preceding control panel 1, reduces the influence to ID, and this
Measuring accuracy can be improved using two distance measuring sensors and an Inertial Measurement Unit in application, be conducive to improve to projection
The correction accuracy of picture.
As it can be seen that the embodiment of the present invention is by pre-establishing relative position information and projected picture between projector and curtain
Mapping table between size, and when the projected picture to projector is corrected, processor can exist according to setting
First distance that the first distance measuring sensor, the second distance measuring sensor and Inertial Measurement Unit in projector obtain respectively, second
The angle and the mapping table that pre-establishes of distance and projector and curtain in vertical direction, match with currently measure this
The corresponding projected picture size of group parameter, and projected picture shape and specific ginseng are capable of determining that according to the projected picture size
Number, to be corrected according to the shape of the projected picture and parameter to the projected picture of projector, so that projector is in curtain
On projected picture presented in the form of rectangular frame, apparatus structure design provided herein is simple, cost is relatively low, and
Lower to the requirement of CPU processing capacity, the scope of application is more extensive.
Referring to figure 5., the embodiment of the present invention has also been correspondingly improved a kind of projection pattern bearing calibration of optical projection system, answers
For such as above-mentioned projection pattern means for correcting, this method comprises:
S110: the first distance between curtain, the transmission of the second distance measuring sensor that the first distance measuring sensor is sent are received
Second distance between curtain and the projector that sends of Inertial Measurement Unit and curtain in the angle of vertical direction, inertia surveys
Measuring unit includes gyroscope and accelerometer；
S120: according to first distance, second distance and angle from the relative position information and projected picture ruler pre-established
Corresponding target projection screen size is matched in very little mapping table；Wherein, the relative position between projector and curtain
Information is obtained according to first distance, second distance and angle；
S130: the projected picture of projector is corrected according to target projection screen size, makes the shadowgraph of projector
Face is rectangular frame.
Further, Inertial Measurement Unit includes gyroscope and accelerometer；
This method further include:
When the acceleration value of accelerometer output is greater than preset threshold, controls the first distance measuring sensor and the second ranging passes
Sensor is started to work.
It should be noted that the projection pattern bearing calibration of optical projection system provided in the present embodiment has and above-mentioned reality
The identical beneficial effect of projection pattern means for correcting of the optical projection system provided in example is applied, and to involved in this present embodiment
To optical projection system projection pattern means for correcting it is specific introduction please refer to above-described embodiment, details are not described herein by the application.
On the basis of above method embodiment, the embodiment of the invention also provides a kind of projection pattern schools of optical projection system
Positive system specifically please refers to Fig. 6.The system includes:
Receiving module 21, for receiving the first distance between curtain, the second ranging of the transmission of the first distance measuring sensor
The projector of the second distance between curtain and Inertial Measurement Unit transmission that sensor is sent and curtain are in vertical direction
Angle；
Matching module 22, for according to first distance, second distance and angle from the relative position information pre-established with
Corresponding target projection screen size is matched in the mapping table of projected picture size；Wherein, between projector and curtain
Relative position information obtained according to first distance, second distance and angle；
Calibration module 23 makes to project for being corrected the projected picture of projector according to target projection screen size
The projected picture of machine is rectangular frame.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (7)
1. a kind of projection pattern means for correcting of optical projection system characterized by comprising controlled on panel before being set to projector
First distance measuring sensor and the second distance measuring sensor, the Inertial Measurement Unit being set in projector are passed with first ranging
The processor that sensor, second distance measuring sensor are connected with the output end of the Inertial Measurement Unit, first ranging pass
The line of sensor and second distance measuring sensor is not orthogonal to horizontal line, and the Inertial Measurement Unit includes gyroscope and acceleration
Degree meter, in which:
First distance measuring sensor, for the first distance between acquisition and curtain；
Second distance measuring sensor, for obtaining the second distance between the curtain；
The Inertial Measurement Unit, for obtaining the projector and the curtain in the angle of vertical direction；
The processor, for believing according to the first distance, second distance and the angle from the relative position pre-established
Target projection screen size corresponding with matching in the mapping table of projected picture size is ceased, and according to the target projection
Screen size is corrected the projected picture of the projector, makes the projected picture rectangular frame of the projector；Wherein,
Relative position information between the projector and the curtain is to obtain according to the first distance, second distance and the angle
It arrives.
2. the projection pattern means for correcting of optical projection system according to claim 1, which is characterized in that the processor, also
When acceleration value for exporting when the accelerometer is greater than preset threshold, first distance measuring sensor, described the are controlled
Two distance measuring sensors and the Inertial Measurement Unit are started to work.
3. the projection pattern means for correcting of optical projection system according to claim 1, which is characterized in that first ranging passes
The line of sensor and second distance measuring sensor passes through the center of the projector lens.
4. the projection pattern means for correcting of optical projection system according to claim 3, which is characterized in that first ranging passes
Sensor, the projector lens center and second distance measuring sensor between line be parallel to horizontal line.
5. the projection pattern bearing calibration of a kind of optical projection system, applied to the perspective view as described in Claims 1-4 any one
Case means for correcting characterized by comprising
Receive the first distance between curtain of the first distance measuring sensor transmission, second distance measuring sensor is sent
Projector that second distance between curtain and the Inertial Measurement Unit are sent and curtain vertical direction angle, it is described
Inertial Measurement Unit includes gyroscope and accelerometer；
According to the first distance, second distance and the angle from the relative position information and projected picture size pre-established
Mapping table in match corresponding target projection screen size；Wherein, the phase between the projector and the curtain
Location information is obtained according to the first distance, second distance and the angle；
The projected picture of the projector is corrected according to the target projection screen size, makes the projection of the projector
Picture is rectangular frame.
6. the projection pattern bearing calibration of optical projection system according to claim 5, which is characterized in that the inertia measurement list
Member includes gyroscope and accelerometer；
The method also includes:
When the acceleration value of accelerometer output is greater than preset threshold, first distance measuring sensor and described the are controlled
Two distance measuring sensors are started to work.
7. a kind of projection pattern of optical projection system corrects system characterized by comprising
Receiving module, for receiving the first distance between curtain, second survey that first distance measuring sensor is sent
Projector away from the sensor second distance between curtain sent and Inertial Measurement Unit transmission is with curtain vertical
The angle in direction；
Matching module, for according to the first distance, second distance and the angle from the relative position information pre-established
Target projection screen size corresponding with being matched in the mapping table of projected picture size；Wherein, the projector and institute
The relative position information stated between curtain is obtained according to the first distance, second distance and the angle；
Calibration module makes institute for being corrected according to the target projection screen size to the projected picture of the projector
The projected picture for stating projector is rectangular frame.
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Cited By (8)
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| CN111294579A (en) * | 2020-02-19 | 2020-06-16 | 母国标 | Method and system for aligning projection picture with curtain center |
| CN111443557A (en) * | 2020-05-13 | 2020-07-24 | 浙江宝妈创客品牌管理有限公司 | Multimedia projection automatic correction device based on light sensation control |
| CN111800620A (en) * | 2020-08-18 | 2020-10-20 | 深圳市慧视智图科技有限公司 | Noninductive trapezoidal correction module of projector and calculation method thereof |
| CN111935468A (en) * | 2020-09-24 | 2020-11-13 | 歌尔股份有限公司 | Method and device for detecting deviation of projection center and computer readable storage medium |
| CN113163186A (en) * | 2020-12-03 | 2021-07-23 | 深圳市当智科技有限公司 | Projection method, system and storage medium based on horizontal correction of distance sensor |
| CN114390261A (en) * | 2020-10-20 | 2022-04-22 | 深圳海翼智新科技有限公司 | Projection system, trapezoidal correction method thereof and device with storage function |
| CN115086622A (en) * | 2021-03-12 | 2022-09-20 | 中强光电股份有限公司 | Projector and correction method thereof |
| CN116708734A (en) * | 2023-08-02 | 2023-09-05 | 深圳市科迈信息技术有限公司 | Calibration equipment and method based on projector output image |
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