CN103034032A - Multi-projector overlying automatic calibration method based on spherical display - Google Patents
Multi-projector overlying automatic calibration method based on spherical display Download PDFInfo
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- CN103034032A CN103034032A CN2012105016740A CN201210501674A CN103034032A CN 103034032 A CN103034032 A CN 103034032A CN 2012105016740 A CN2012105016740 A CN 2012105016740A CN 201210501674 A CN201210501674 A CN 201210501674A CN 103034032 A CN103034032 A CN 103034032A
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Abstract
The invention discloses a multi-projector overlying automatic calibration method based on spherical display. The multi-projector overlying automatic calibration method is characterized by including the steps of generating calibration grids through a computer, and respectively outputting the calibration grids to a plurality of projectors, projecting the calibration grids of each projector to a spherical display surface through a plurality of fish-eye lenses, shooting images on the spherical display surface through shooting equipment, and the like. According to the requirements of multi-projector overlying rapid calibration, and through the adoption of computer automatic calibration method after shooting image contrast, the multi-projector overlying automatic calibration method can carry out preprocessing to the images projected to the spherical display surface through each projector, and enables the projected images of the plurality of projectors on the spherical display surface to be perfectly overlapped, and achieves the purpose of multi-projector overlying rapid calibration. In addition, the multi-projector overlying automatic calibration method is easy to operate, and solves the problem that a manual regulating method in the prior art is time-consuming and labor-consuming in the regulating process.
Description
Technical field
The present invention relates to the automatic calibrating method in projection display technique field, especially relate to a kind of multi-projector stack automatic calibrating method that shows based on sphere.
Background technology
Macrotype spherical shows that product in order to realize high brightness and low cost, has produced and adopted many projector's stacked systems to realize the solution of high-brightness projection at present.Prior art adopts the method for manually adjusting usually, and every projector is anticipated to the picture of ball-screen projection, and the projected picture of many projectors on the ball curtain overlapped, and adjustment process wastes time and energy.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, the automatic calibrating method that provides a kind of multi-projector that shows based on sphere to superpose, the method that adopts camera or camera to take gathers image, automatically regulate every projector to the picture of ball-screen projection by computer program, the realization projected picture overlaps, do not need manual shift, and adjustment process is very fast.
The technical solution used in the present invention is as follows:
A kind of multi-projector stack automatic calibrating method that shows based on sphere is characterized in that may further comprise the steps: generate the calibration grid by computing machine, output to respectively in many projectors; With a plurality of fish eye lenses respectively with the calibration Grid Projection of every projector on spherical display surface; With the image on the capture apparatus shooting spherical display surface; Select wherein that the projected image of the calibration grid of a projector is reference picture, regulate the center of calibration grid, the center of projected image of the calibration grid of another projector is overlapped with the center of reference picture; Regulate the net point position of another projector; Again take the image on the spherical display surface, the displacement of each net point after regulating with the previous image comparing calculation; Again regulate the net point position of another projector according to result of calculation, make another projector the calibration grid each net point on the projected image with reference picture on corresponding net point overlap; The correction data of each net point after the record calibration; Calibrate successively the position of each net point of the calibration grid of other projectors according to said method, make other projectors the calibration grid each net point on the projected image with reference picture on corresponding net point overlap; Obtain the correction data of each net point after other projectors calibrate; Recycle described correction data and the picture of each projector output is carried out graph transformation process, the projected picture of each projector on the ball curtain overlapped fully, realize overlaying function.
Described calibration grid be the center of calibrating grid be the round wire in the center of circle and the circle out shape grid that intersects to form as the radioactive ray of radiation point take the center of calibration grid, described net point is the point of crossing of round wire and radioactive ray.
In the step of described adjusting net point position, control method is the pointwise calibration, or the curvilinear equation calibration; Described pointwise calibration refers to regulate successively the position of each net point; Described curvilinear equation calibration refers to according to curvilinear equation, regulates the position of whole piece round wire or whole piece radioactive ray.
Describedly utilize described correction data that the picture of stating the output of other projectors is carried out graph transformation to process, refer to described correction data as net point displacement regulated quantity, the net point of the relevant position of the projected image of described other projectors is carried out phase
Beneficial effect of the present invention has:
The present invention is directed to the quickly calibrated needs of multi-projector stack, adopt the method for the rear computing machine automatic calibration of photographic images contrast, every projector is anticipated to the picture of spherical display surface projection, make the projected picture perfect registration of many projectors on spherical display surface, realize the quickly calibrated purpose of multi-projector stack; And simple to operate, overcome the method for the manual adjustments that prior art adopts, the problem that exists adjustment process to waste time and energy.
Description of drawings
Fig. 1 is the embodiments of the invention synoptic diagram.
Fig. 2 is the calibration grid chart of the embodiment of the invention.
Fig. 3 is the grid chart after the method according to this invention is calibrated Fig. 2.
Reference numeral lists as follows: 1-ball curtain, 2-the first fish eye lens, 3-the second fish eye lens, 4-the first projector, 5-the second projector, 6-computing machine, 7-capture apparatus.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
The present invention at first generates the calibration grid by computing machine, outputs to respectively in every projector; Then by fish eye lens respectively with the calibration Grid Projection of every projector to the ball curtain; By the image on the capture apparatus shooting ball curtain; The selection wherein projected image of the calibration grid of a projector is reference picture, calibrates successively each net point of the calibration grid of other projectors; The image of repeatedly taking on the ball curtain is revised calibration result, and each net point of the calibration grid of each projector is overlapped at the ball curtain; Obtain the correction data of each net point after described other projectors calibrate; Recycle described correction data and the picture of described other projectors output is carried out graph transformation process, the projected picture of each projector on the ball curtain overlapped fully, realize overlaying function.
As shown in Figure 1, embodiment synoptic diagram for the multi-projector stack automatic calibrating method that shows based on sphere of the present invention, it comprises ball curtain 1, computing machine 6, capture apparatus 7, the first projector 4, the second projector 5, corresponding the first fish eye lens 2, the second projectors of the first projector 45 corresponding the second fish eye lenses 3; Ball curtain 1 lower end arranges an opening, fish eye lens is arranged on described opening center, in the present embodiment, two fish eye lenses are arranged on the symmetria bilateralis position of the central point of ball curtain lower ending opening, the light that projector 4 sends projects on the ball curtain 1 by fish eye lens 2, and the light that projector 5 sends projects on the ball curtain 1 by fish eye lens 3; Computing machine 6 respectively with the first projector 4 be connected projector 5 and be connected, be used for controlling projection machine 4 and projector 5 to the projection of ball curtain 1, projector 4 and projector 5 projected image on ball curtain 1 is overlapped fully.
Because projector 4 and projector 5 positions is different, directly the image of projection can not overlap on ball curtain 1, and among Fig. 1, what solid line represented is the light path of projector's 4 direct projections, and what dotted line represented is the light path of projector's 5 direct projections; Adopt the following multi-projector stack automatic calibrating method that shows based on sphere of the present invention, projector 4 and projector 5 are anticipated to the projected image of ball curtain 1, two projected images of projector on the ball curtain can be overlapped fully.
As shown in Figure 2, in the present embodiment, the calibration grid that is generated by computing machine be the center of calibrating grid be the round wire in the center of circle and the circle out shape grid that intersects to form as the radioactive ray of radiation point take the center of calibration grid, net point is the point of crossing of round wire and radioactive ray; Mesh-density requires to decide according to size and the calibration accuracy of ball curtain, be generally 20 radioactive ray of 10*20(10 bar round wire *) to 120 radioactive ray of 40*120(40 bar round wire *) between, calibration grid shown in Figure 2 is outputed to respectively in the projector 4 and projector 5 among Fig. 1, select wherein projector, for example take the projected image of calibration grid on ball curtain 1 of projector 4 as reference picture, calibrate according to the following steps each net point of the calibration grid of projector 5: 1) at first regulate the center of calibration grid, the center of projected image of the calibration grid of projector 5 is overlapped with the center of the reference picture of projector 4; 2) regulate respectively the position of net point of the calibration grid of projector 5, make this projector the calibration grid each net point on the projected image with reference picture on corresponding net point overlap.Step 2) control method in is the pointwise calibration, or the curvilinear equation calibration; Pointwise calibration refers to that successively manual operations regulates the position of each net point, makes net point coincidence corresponding on the reference picture of net point that projector 5 projects and projector 4; The curvilinear equation calibration refers to according to curvilinear equation, regulate the whole piece round wire of calibration grid chart or the position of whole piece radioactive ray, corresponding round wire and radioactive ray coincidence on the reference picture of each the bar round wire that makes the calibration grid chart that projector 5 projects and radioactive ray and projector 4.Calibrate complete after, each net point of projector 5 has had new positional information, and the calibration data of each net point is kept in the computing machine.Utilizing above-mentioned net point calibration data that the picture of projector's 5 outputs is carried out the graph transformation processing, as shown in Figure 3, is an example of the grid chart after the calibration, and the relatively original net point of net point has had the position skew.With above-mentioned net point calibration data as net point displacement regulated quantity, point to the relevant position of the projected image of projector 5 carries out just can realizing graph transformation behind the corresponding shift transformation, thereby picture that projector 5 gets is overlapped fully with picture that projector 4 gets on ball curtain 1, realize overlaying function.
The undeclared part of other that the present invention relates to is same as the prior art.
Claims (4)
1. multi-projector stack automatic calibrating method that shows based on sphere is characterized in that may further comprise the steps:
Generate the calibration grid by computing machine first, output to respectively in many projectors;
With a plurality of fish eye lenses respectively with the calibration Grid Projection of every projector on spherical display surface;
With the image on the capture apparatus shooting spherical display surface;
Select wherein that the projected image of the calibration grid of a projector is reference picture, regulate the center of calibration grid, the center of projected image of the calibration grid of another projector is overlapped with the center of reference picture;
Regulate the net point position of another projector;
Again take the image on the spherical display surface, the displacement of each net point after regulating with the previous image comparing calculation;
Again regulate the net point position of another projector according to above-mentioned result of calculation, make another projector the calibration grid each net point on the projected image with reference picture on corresponding net point overlap;
The correction data of each net point after the record calibration;
Calibrate successively the position of each net point of the calibration grid of other projectors according to said method, make other projectors the calibration grid each net point on the projected image with reference picture on corresponding net point overlap;
Obtain the correction data of each net point after other projectors calibrate;
Recycle described correction data and the picture of each projector output is carried out graph transformation process, the projected picture of each projector on the ball curtain overlapped fully, realize overlaying function.
2. the multi-projector stack automatic calibrating method that shows based on sphere according to claim 1, it is characterized in that: described calibration grid be the center of calibrating grid be the round wire in the center of circle and the circle out shape grid that intersects to form as the radioactive ray of radiation point take the center of calibration grid, described net point is the point of crossing of round wire and radioactive ray.
3. the multi-projector stack automatic calibrating method that shows based on sphere according to claim 1 and 2, it is characterized in that: in the step of described adjusting net point position, control method is the pointwise calibration, or the curvilinear equation calibration; Described pointwise calibration refers to regulate successively the position of each net point; Described curvilinear equation calibration refers to according to curvilinear equation, regulates the position of whole piece round wire or whole piece radioactive ray.
4. the multi-projector stack automatic calibrating method that shows based on sphere according to claim 1, it is characterized in that: utilize described correction data that the picture of stating other projector's outputs is carried out graph transformation and process, refer to described correction data as net point displacement regulated quantity, the net point of the relevant position of the projected image of described other projectors is carried out corresponding shift transformation.
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| CN103713457A (en) * | 2013-12-12 | 2014-04-09 | 浙江大学 | Geometrical correction device and method for 360-degree annular screen multi-projection system |
| CN104537616A (en) * | 2014-12-20 | 2015-04-22 | 中国科学院西安光学精密机械研究所 | Correction Method of Fisheye Image Distortion |
| CN105469389A (en) * | 2015-11-16 | 2016-04-06 | 北京航空航天大学 | Grid ball target for visual sensor calibration and corresponding calibration method |
| CN110475110A (en) * | 2019-09-25 | 2019-11-19 | 上海迪东实业有限公司 | Projected image geometric correction method, projected image geometrical correction device and projector |
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Application publication date: 20130410 |