CN204302650U - A kind of projector of automatically calibrating geometric distortion - Google Patents
A kind of projector of automatically calibrating geometric distortion Download PDFInfo
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- CN204302650U CN204302650U CN201420721184.6U CN201420721184U CN204302650U CN 204302650 U CN204302650 U CN 204302650U CN 201420721184 U CN201420721184 U CN 201420721184U CN 204302650 U CN204302650 U CN 204302650U
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Abstract
The utility model is applicable to projection art, provide a kind of projector of automatically calibrating geometric distortion, comprise: projector's main body, projector's main body is provided with the direction sensor for detecting projector's main body angle of inclination, for the correction parameter computing module according to angle of inclination generating correction parameters, and for the projection lens geometric correction device according to correction parameter adjustment projector lens; The input of correction parameter computing module is connected with direction sensor, and output is connected with projection lens geometric correction device.The utility model is by installation direction transducer and range sensor in projector, automatically the distance between the angle of inclination of projector and projection lens and screen can be detected, by correction parameter computing module according to detected parameters generating correction parameters, and by projection lens geometric correction device, machinery adjustment is carried out to projection lens, eliminate geometric distortion.Compact equipment, adapts to scene extensive, and antijamming capability is strong, and correction accuracy is high.
Description
Technical field
The utility model belongs to projection display technique field, particularly a kind of projector of automatically calibrating geometric distortion.
Background technology
Projector equipment adopts optical technology to realize Projection Display usually, due to reasons such as machine ornaments, always there is geometric distortion in the picture that projector projects to screen, the method for the geometry distrotion correction adopted at present comprises: (1). and manually adjustment distortion knob corrects; (2). the specific or not specific picture projected out by camera shooting projector, is calculated geometric distortion, and corrects; (3). by installing certain transducer on screen, obtaining the geometric distortion of image, thus correcting.Such as, application number is the patent application of 200910058382, by installing optical sensor in projection screen, preset various optical mode by being projected successively to projection screen by projector equipment simultaneously, thus calculate the geometrical correspondence obtained between projected image and original image, thus carry out geometric correction; The patent application of application number 201220131532, projected on the projection screen by four infrared laser generators, then obtain by the shooting of cmos transducer the image having four hot spots, by analyzing this image thus obtaining distortion parameter, then correct; Application number is the patent application of 200910165478, directly takes projected picture by camera, analyzes the image of shooting thus obtains geometric correction.
Manual adjustment method complicated operation, uses inconvenience; The method that shooting projected picture carries out geometric correction is subject to the impact of shooting environmental, there is certain error of calculation; Realize the geometric correction method to image by sensor installation on the projection screen, because needs carry out sensor installation at projection screen, limit the application scenarios of projection, and equipment relative complex is a lot.Therefore, need to provide a kind of quick geometric correction scheme accurately newly.
Utility model content
The purpose of this utility model is the projector providing a kind of automatically calibrating geometric distortion, is intended to the geometric distortion correcting projection fast, accurately, applied range and antijamming capability is strong.
The utility model realizes like this, a kind of projector of automatically calibrating geometric distortion, comprise: projector's main body, described projector main body is provided with the direction sensor for detecting described projector's main body angle of inclination, for the correction parameter computing module according to described angle of inclination generating correction parameters, and for the projection lens geometric correction device according to described correction parameter adjustment projector lens; The input of described correction parameter computing module is connected with described direction sensor, and output is connected with described projection lens geometric correction device.
As optimal technical scheme of the present utility model:
Described projector main body is also provided with the range sensor of the spacing for the exit facet and projection screen detecting described projector lens, and described range sensor is connected with described correction parameter computing module.
Described range sensor adopts sound ranging instrument or laser ranging instrument.
Described projection lens geometric correction device is connected with the projection lens of described projector.
The projection angle of the actual angle of inclination that described angle of inclination comprises projector's main body relative level face on two mutually orthogonal vertical planes, described two vertical planes are parallel and vertical respectively with projection screen.
Described projector main body is provided with the switch for opening automatic calibration.
The utility model is by installation direction transducer and range sensor in projector, automatically the distance between the angle of inclination of projector and projection lens and screen can be detected, by correction parameter computing module according to detected parameters generating correction parameters, and by projection lens geometric correction device, machinery adjustment is carried out to projection lens, eliminate geometric distortion.This projector's correcting scheme is abandoned and is manually adjusted correction, does not also need to arrange any equipment on screen, does not adopt camera to take, compact equipment, adapts to scene extensive, and antijamming capability is strong, and correction accuracy is high, is applicable to extensively adopting.
Accompanying drawing explanation
Fig. 1 is the structural representation of the projector of the automatically calibrating geometric distortion that the utility model embodiment provides;
Fig. 2 is the first projection state figure of the projector of the automatically calibrating geometric distortion that the utility model embodiment provides;
Fig. 3 is the second projection state figure of the projector of the automatically calibrating geometric distortion that the utility model embodiment provides;
Fig. 4 is the third projection state figure of the projector of the automatically calibrating geometric distortion that the utility model embodiment provides;
Fig. 5 is the angle of inclination schematic diagram of the projector of the automatically calibrating geometric distortion that the utility model embodiment provides;
Fig. 6 is the flow chart of the automatic geometric correction method of the projector that the utility model embodiment provides.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Below in conjunction with specific embodiment, specific implementation of the present utility model is described in detail:
The utility model embodiment provides a kind of projector of automatically calibrating geometric distortion, with reference to figure 1, show the functional structure electrical connection schematic diagram of projector, this projector mainly comprises: projector's main body 101, is arranged on the direction sensor 102 in projector's main body 101, correction parameter computing module 103 and projection lens geometric correction device 104.The input of this correction parameter computing module 103 is connected with direction sensor 102, and output is connected with projection lens geometric correction device 104.Direction sensor 102 is for detecting the angle of inclination of projector's main body 101, and detection data are sent to correction parameter computing module 103, the data at correction parameter computing module 103 pairs of angles of inclination process, generating correction parameters, and be sent to projection lens geometric correction device 104, projection lens geometric correction device 104 adjusts projector lens, to correct the geometric distortion of projected picture according to correction parameter.
Further, the all right mounting distance transducer 105 of this projector's main body 101, being connected with correction parameter computing module 103, for detecting the distance between the exit facet of projector lens and projection screen, and this distance parameter being transferred to correction parameter computing module.
In the present embodiment, direction sensor 102 can adopt the various transducer with orientation function residing for detection self or appended object, and has electronic data output function.Range sensor 105 also can adopt existing transducer, as sound ranging, and the transducer of the types such as laser ranging.Correction parameter computing module 103 is the modules with data processing function for correcting desired data exploitation, in this module, store the parameter of direction sensor 102 and range sensor 105 detection and the conversion relation of correction parameter, the distance parameter that the angle of inclination parameter detected according to direction sensor 102 and range sensor 105 detect, the correction parameter of projection lens can be calculated, and then send to projection lens geometric correction device 104, this projection lens geometric correction device 104 has mechanical adjustment function, projection angle (the such as rotating lens of projector lens quantitatively can be regulated according to this correction parameter, adjustment camera lens elevation angle etc.) or focal length etc., and then the geometric distortion of correcting orthographic projection image.
The projection distortion of projector mainly contains three kinds of situations, as Fig. 2, the first be the left end of projector or right-hand member higher or lower than predeterminated position, projection light is still vertical with screen 106, but projected picture can relative level face tilt certain angle.As Fig. 3, the second be the front end of projector or rear end higher or lower than predeterminated position, now projection light and screen 104 out of plumb, projected picture and horizontal plane do not tilt, but similar trapezoidal picture appears in screen.As Fig. 4, the third be the front and back end of projector and left and right end not at predeterminated position, now projected picture is the irregular picture of relative level face tilt.For these three kinds of situations, direction sensor 102 all can detect corresponding angle of inclination.As Fig. 5, the projection angle α of the actual angle of inclination γ that the angle of inclination of the present embodiment comprises projector's main body 101 relative level face on two mutually orthogonal vertical planes (XZ face and YZ face) and angle beta, namely angle γ can be analyzed to angle [alpha] and angle beta, and these two vertical planes are parallel and vertical respectively with projection screen 106.Be appreciated that when there is the first situation, angle [alpha]=0, β ≠ 0, when there is the second situation, angle [alpha] ≠ 0, β=0, when there is the third situation, angle [alpha] ≠ 0, β ≠ 0.Above-mentioned angle [alpha] and angle beta are sent to correction parameter computing module 103 by direction sensor 102.In addition, when there is the second and the third situation, the distance l between projector lens from screen changes with different angles of inclination, therefore, at this moment not only need to measure angle of inclination, also will measure the distance l between the exit facet of projector lens and screen.Direction sensor 102 and range sensor 105 all gather relevant parameter and send to correction parameter computing module 103.When there is the first situation, the distance between projection lens and screen is constant, can not need range sensor 105.
Suppose the adjustment parameter on four summits of the projection quadrilateral that (m, n, p, q) needs geometry to adjust for projector, then (m, n, p, q) and α, β, l tri-parameter correlations.
{m，n，p，q}＝F(α，β，l)
In correction parameter calculates, correction parameter computing module is prefixed calculating parameter or computing function, when being preset in some specific α, β, l, and { m, n, p, q}={0,0,0,0}.By by parameter alpha, β, l are input in correction parameter computing module, can export that { m, n, p, q}, projector is corrected by the geometrical property of m, n, p, q tetra-parameters to projector.
In the present embodiment, can arrange the switch for opening automatic calibration in projector's main body 101, manually touch switch corrects.Also direction sensor can be made to detect angle of inclination in real time, when detecting that angle of inclination is non-vanishing, triggering other devices and correcting.
The utility model is by installation direction transducer and range sensor in projector, automatically the distance between the angle of inclination of projector and projection lens and screen can be detected, by correction parameter computing module according to detected parameters generating correction parameters, and by projection lens geometric correction device, machinery adjustment is carried out to projection lens, eliminate geometric distortion.This projector's correcting scheme is abandoned and is manually adjusted correction, does not also need to arrange any equipment on screen, does not adopt camera to take, compact equipment, adapts to scene extensive, and antijamming capability is strong, and correction accuracy is high, is applicable to extensively adopting.
The utility model further illustrates the automatic geometric correction method implemented based on above-mentioned projector, and with reference to figure 6, this automatic geometric correction method comprises the steps:
In step S101, detected the angle of inclination of projector's main body 101 by direction sensor 102, and by this angle of inclination parameter transmission to correction parameter computing module;
In step s 102, described correction parameter computing module 103 according to described angle of inclination calculation of parameter correction parameter, and is sent to projection lens geometric correction device 104;
In step s 103, described projection lens geometric correction device 104, according to described correction parameter adjustment projector lens, corrects the geometric distortion of projected picture.
Same as above, the projection angle α of the actual angle of inclination γ that angle of inclination in the method comprises projector's main body 101 relative level face on two mutually orthogonal vertical planes (XZ face and YZ face) and angle beta, namely angle γ can be analyzed to angle [alpha] and angle beta, and these two vertical planes are parallel and vertical respectively with projection screen 106.In addition, when angle [alpha] ≠ 0, detect the distance l between projector lens and screen by range sensor 105, and export correction parameter computing module to, correction parameter computing module calculates correction parameter according to this distance l, angle [alpha] and angle beta.Projection lens geometric correction device according to parameters such as the projection angle of this parameter adjustment projector lens and focal lengths, to correct the geometric distortion of projected picture.
This automatic geometric correction method is implemented based on above-mentioned projector, projector's correction can be carried out accurately and fast, do not need manually to adjust correction, need any equipment be set on screen, do not adopt camera to take, adapt to scene extensive, antijamming capability is strong, and correction accuracy is high, be applicable to extensively adopting.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (6)
1. the projector of an automatically calibrating geometric distortion, it is characterized in that, comprise: projector's main body, described projector main body is provided with the direction sensor for detecting described projector's main body angle of inclination, for the correction parameter computing module according to described angle of inclination generating correction parameters, and for the projection lens geometric correction device according to described correction parameter adjustment projector lens; The input of described correction parameter computing module is connected with described direction sensor, and output is connected with described projection lens geometric correction device.
2. projector as claimed in claim 1, it is characterized in that, described projector main body is also provided with the range sensor of the spacing for the exit facet and projection screen detecting described projector lens, and described range sensor is connected with described correction parameter computing module.
3. projector as claimed in claim 2, is characterized in that, described range sensor adopts sound ranging instrument or laser ranging instrument.
4. projector as claimed in claim 1, it is characterized in that, described projection lens geometric correction device is connected with the projection lens of described projector.
5. projector as claimed in claim 1, it is characterized in that, the projection angle of the actual angle of inclination that described angle of inclination comprises projector's main body relative level face on two mutually orthogonal vertical planes, described two vertical planes are parallel and vertical respectively with projection screen.
6. projector as claimed in claim 1, it is characterized in that, described projector main body is provided with the switch for opening automatic calibration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420721184.6U CN204302650U (en) | 2014-11-25 | 2014-11-25 | A kind of projector of automatically calibrating geometric distortion |
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| CN201420721184.6U CN204302650U (en) | 2014-11-25 | 2014-11-25 | A kind of projector of automatically calibrating geometric distortion |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460197A (en) * | 2014-11-25 | 2015-03-25 | 深圳先进技术研究院 | Projector capable of automatically correcting geometric distortion and correcting method thereof |
| CN106254843A (en) * | 2016-08-24 | 2016-12-21 | 成都市极米科技有限公司 | A kind of projector and projected picture geometric correction method, Apparatus and system |
| CN106331549A (en) * | 2015-06-30 | 2017-01-11 | 中强光电股份有限公司 | Projection apparatus |
| CN106713883A (en) * | 2017-01-13 | 2017-05-24 | 湖南理工学院 | Intelligent rotary projector and automatic calibration method thereof |
| CN108769459A (en) * | 2018-06-07 | 2018-11-06 | 北京理工大学 | Multiple spot laser Full-automatic oblique angle shot based on image procossing corrects system |
| CN109688390A (en) * | 2018-12-12 | 2019-04-26 | 中国科学院深圳先进技术研究院 | A kind of projected picture auto-correction method, system |
| CN113038101A (en) * | 2021-03-10 | 2021-06-25 | 江苏金视传奇科技有限公司 | Automatic four-corner trapezoidal correction method and device |
-
2014
- 2014-11-25 CN CN201420721184.6U patent/CN204302650U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460197A (en) * | 2014-11-25 | 2015-03-25 | 深圳先进技术研究院 | Projector capable of automatically correcting geometric distortion and correcting method thereof |
| CN106331549A (en) * | 2015-06-30 | 2017-01-11 | 中强光电股份有限公司 | Projection apparatus |
| CN106254843A (en) * | 2016-08-24 | 2016-12-21 | 成都市极米科技有限公司 | A kind of projector and projected picture geometric correction method, Apparatus and system |
| CN106713883A (en) * | 2017-01-13 | 2017-05-24 | 湖南理工学院 | Intelligent rotary projector and automatic calibration method thereof |
| CN106713883B (en) * | 2017-01-13 | 2019-02-22 | 湖南理工学院 | A kind of intelligent rotary type projector and its auto-correction method |
| CN108769459A (en) * | 2018-06-07 | 2018-11-06 | 北京理工大学 | Multiple spot laser Full-automatic oblique angle shot based on image procossing corrects system |
| CN109688390A (en) * | 2018-12-12 | 2019-04-26 | 中国科学院深圳先进技术研究院 | A kind of projected picture auto-correction method, system |
| CN109688390B (en) * | 2018-12-12 | 2020-11-17 | 中国科学院深圳先进技术研究院 | Automatic correction method and system for projection picture |
| CN113038101A (en) * | 2021-03-10 | 2021-06-25 | 江苏金视传奇科技有限公司 | Automatic four-corner trapezoidal correction method and device |
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