CN106067160B - Large screen merges projecting method - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000009466 transformation Effects 0.000 claims abstract description 35
- 230000000694 effects Effects 0.000 claims abstract description 24
- 238000012937 correction Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims description 8
- 230000004927 fusion Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 230000002452 interceptive effect Effects 0.000 description 3
- 238000013507 mapping Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
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- 238000007654 immersion Methods 0.000 description 1
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Abstract
The invention discloses a kind of large screens to merge projecting method, its key points of the technical solution are that reducing the threedimensional model of corresponding proportion using three-dimensional modeling method building showroom and establishing showroom partial 3 d coordinate system, the projected image of more projectors is spliced by whole projected image using image split-joint method simultaneously, and store the whole projected image effect picture that whole projected image reduces corresponding proportion, then simulate to obtain the effect model that whole projected image effect picture is projected on parallel screen using parallel projection methods, control point and dominating pair of vertices on acquisition annular screen should be in the same place on effect model and the pixels in whole projected image result figure, based on coordinate value of control point, third transformation equation is calculated in identical point coordinates value and pixel coordinate, the calculating of third transformation equation finally is carried out to real projection image, make Correct position of each pixel projection of projected image on annular screen；The geometric correction process of large screen projection image is completed in this way.
Description
Technical field
The present invention relates to field of image processing, in particular to a kind of large screen merges projecting method.
Background technique
Large screen fusion projecting method is seamlessly to project three in real time on large scale annular screen using more projectors
The display system of scene is tieed up, it has bigger display size, the broader visual field, more aobvious than common standard projection system
Show content, higher display resolution, and the visual effect of more impact force and feeling of immersion, be widely used in science,
The fields such as education, national defence, amusement, the energy, manufacturing industry and government.There are 3 key technologies in large screen fusion projecting method, i.e., it is several
What correction, edge fusion technology and color consistency matching technique.
The solution is to the rectangular display content of projector is projected to by mapping equation for geometric correction
The correct position of annular screen；The solution is to the brightness protrusions of more overlapping view fields of projector to ask for edge fusion technology
Topic；Color consistency matches the problem inconsistent the solution is to more projector's colour gamuts.
Large screen fusion projecting method is mainly made of screen, projector, design eyespot and the cone, wherein design eyespot
It is the large screen fusion very important component part of projecting method, scene is only only from the image that the point is observed theoretically
Geometry is correct, and the cone refers to being used corresponding to a projector, from the observation virtual scene that design eyespot sets out
Depending on seeing centrum, theoretically, the optical center of projector is located at design eyespot, and projector's light cone is identical with the cone, then the list
The projected image of platform projector need not carry out geometric correction, but this is impossible in practical engineering applications.
In view of the above-mentioned problems, the paper that 09 phases in 2013 of CAD and graphics journal publish: one
The practical multi-channel visual simulation optical projection system interactive mode geometric correction technology of kind proposes a kind of interactive geometric correction in scene
Method calibrates projector using the depth information of screen itself, existed using the laser transit for being located at screen center
Control point is marked on the screen area of the projected image covering of separate unit projector, it is several using its horizontal, azimuth reading and screen
The information such as what radius obtain coordinate of these control points under world coordinate system, then look in the projected image of separate unit projector
To position corresponding to control point and pixel coordinate is recorded, then utilizes the world coordinate system and pixel coordinate system at control point
The inside and outside parameter of projector is accurately calculated, intrinsic parameter obtained by calculation determines the light cone of projector, true by outer parameter
Position and the posture for determining projector obtain target image in virtual scene using aforementioned result with projector " observation " screen,
According to test target and target image, geometric correction is completed.
A kind of method essence of practical multi-channel visual simulation optical projection system interactive mode geometric correction technology proposed
On be the mapping relations for establishing control point between world coordinate system and pixel coordinate system, to realize geometric correction；It should
Method using screen itself as calibration object of reference and use intensive control point so that the precision of geometric correction have it is biggish
Improve, but this method building be world coordinate system and separate unit projector projection
Mapping relations between image coordinate system, to obtain higher correction accuracy, the world coordinates value at control point
Need to retain longer scale, calculation amount is larger, and one difference of scale can all cause biggish meter
Error is calculated, therefore, there is also places to be modified.
Summary of the invention
The object of the present invention is to provide a kind of large screens to merge projecting method, and the geometry school of projected image is completed using software
Positive process.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of large screen merges projecting method, including annular screen and is equipped with the showroom of annular screen,
Firstly, constructing the threedimensional model that the showroom reduces corresponding proportion using three-dimensional modeling method；
Second, the projected image of more projectors is spliced into using image split-joint method by whole projected image, and store
Whole projected image result figure after reducing corresponding proportion；
Third, the threedimensional model based on the showroom construct showroom partial 3 d coordinate system；
4th, it simulates whole projected image result figure and is directly incident upon the effect model on parallel screen；
5th, using the origin of showroom partial 3 d coordinate system as point of observation, several controls are extracted on annular screen
System point and several dominating pair of vertices should be in the same places on effect model；
6th, control point and same place are obtained respectively by software measurement tool with respect to showroom partial 3 d coordinate system
Origin distance, and stored；
7th, it is fitted to obtain effect model and annular screen using least square method based on multiple groups control point and same place group
Between the first transformation equation；
8th, image coordinate system is constructed based on whole projected image result figure, and store same place in image coordinate
Pixel coordinate value in system；
9th, the second transformation equation is established based on identical point coordinates value and pixel coordinate value；
Tenth, it is obtained between pixel coordinate value and coordinate value of control point based on the first transformation equation and the second transformation equation
Third transformation equation；
11st, based on the third transformation equation that the tenth step is established, true whole projected image is converted according to third
Equation carries out transformation calculations pixel-by-pixel, so that projected image is projected on annular screen completely；Perspective view is completed in this way
The geometric correction process of picture.
Preferably, the showroom partial 3 d coordinate system using the center of showroom as coordinate origin, is shown
The width direction in the Room is horizontal axis, and the length direction of showroom is vertical pivot, and the short transverse of showroom is the longitudinal axis, and with one meter practical
Distance reduce corresponding proportion after length be unit length construct.
Preferably, described image coordinate system, using the image lower left corner as origin, picture traverse direction is horizontal axis, image is long
Degree direction is the longitudinal axis, and single pixel is unit building.
Preferably, annular screen is divided into along the lateral central axes and longitudinal central axis line of annular screen four small
Screen, and using four angle points of four the small screen and central point as control point, control point is recorded in showroom partial 3 d coordinate
The coordinate value of system.
Preferably, connecting point of observation and annular screen using the origin of showroom partial 3 d coordinate system as point of observation
On control point intersect at a point with the direct drop shadow effect's model of projected image, which is the of the same name of control point on annular screen
Point successively finds out the same place at control point using the above method, and records control point and same place respectively in showroom part three
Coordinate value in dimensional coordinate system.
Preferably, the coordinate value based on control point and same place, using least square method be fitted to obtain annular screen with
The first transformation equation between the direct drop shadow effect's model of projected image.
Preferably, extracting the corresponding pixel of same place and pixel coordinate in image coordinate system, base based on effect model
The second transformation between image coordinate system and showroom partial 3 d coordinate system is established in pixel coordinate and identical point coordinates
Equation.
Using the above scheme, showroom is established out by constructing the threedimensional model of showroom accurately to reduce corresponding proportion
Local coordinate system, while the projected image of more projectors is spliced by whole projected image by image split-joint method, so
Whole projected image is stored afterwards reduces the whole projected image effect picture after corresponding proportion；And it simulates projected image and directly projects
Effect model；Then several control points are acquired on annular screen, the more quantity the better, while finding out control point in perspective view
The same place on effect model that picture directly projects, and control point and same place are recorded respectively in showroom partial 3 d coordinate
Coordinate value and extraction in system simultaneously record the pixel coordinate value of control point on projection images, are based on control point and same place
Coordinate value, establish the first transformation equation between annular screen and the direct drop shadow effect's model of projected image；Based on same place
Coordinate value and pixel coordinate value, establish the second transformation side between showroom partial 3 d coordinate system and image coordinate system
Journey；Be then based on the first transformation equation and the second transformation equation, establish showroom partial 3 d system and image coordinate system it
Between third transformation equation, transformation calculations pixel-by-pixel finally are carried out according to third transformation equation to whole projected image so that
Projected image is projected on annular screen completely.Because showroom partial 3 d coordinate system is established by object of reference of showroom, ring
Shaped screen is easier to measure with respect to the position of showroom, and numerical value is more accurate.
In conclusion the invention has the following advantages:
By establishing showroom Local coordinate system, so that annular screen is relative to the opposite of showroom partial 3 d system
More easily measurement obtains and measurement accuracy is higher for position.
Detailed description of the invention
Fig. 1 is the flow diagram of the present embodiment.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
A kind of large screen fusion projecting method, annular screen disclosed in the present embodiment are mounted in showroom,
It is shown firstly, being established using three-dimensional modeling methods such as basic body, expanded body, Boolean calculation, rotation, stretching and setting-outs
The Room reduces the showroom threedimensional model such as 0.001 times, it is desirable that the showroom threedimensional model of building really reflects showroom and annular
The size of relative positional relationship between screen, especially annular screen, the size of showroom and annular screen and showroom
The distance between relationship will accurately reflect；
Second, the projected image of more projectors is spliced by whole perspective view based on the image split-joint method of contour feature
Picture, and the whole projected image result figure after 0.001 times of the diminution of whole projected image is stored；
Third, the threedimensional model based on showroom, using the center of showroom as coordinate system origin, the width of showroom
Degree is the horizontal axis of coordinate system, using the length of showroom as the vertical pivot of coordinate system, using the height of showroom as coordinate system
The longitudinal axis, while practical one meter of distance is reduced into 0.001 times i.e. 0.001 meter and constructs showroom partial 3 d coordinate system for unit length
System；
4th, the effect that whole projected image result figure is directly incident upon on parallel screen is simulated using parallel projection methods
Fruit model；
5th, annular screen is divided into four using the lateral central axes of annular screen and longitudinal central axis line as line of demarcation
The small screen, and four angle points and the central point for extracting four the small screen are control point；With the original of showroom partial 3 d coordinate system
Point is point of observation and connects point of observation and control point, and the line between point of observation and control point intersects at a point with effect model,
The point is the same place at control point；
6th, control point and same place opposite showroom part three respectively are measured by software measurement tool such as measuring scale
The distance of the origin of dimensional coordinate system, including lateral distance, vertical distance and longitudinal recording, and store respective value；
7th, based on the multiple control points extracted on annular screen and on effect model it is corresponding extract it is of the same name
Point is established multiple groups same place group, and is become using the multinomial first between least square method fitting effect model and annular screen
Change equation；
8th, using the lower left corner of whole projected image result figure as origin, picture traverse direction is horizontal axis, image length side
To for the longitudinal axis, single pixel is that unit constructs image coordinate system, while same place institute is successively found out in image coordinate system
Corresponding pixel and the pixel coordinate value for recording pixel；
9th, the correlativity based on multiple groups identical point coordinates value and pixel coordinate value fits the second transformation equation；
Tenth, it is obtained between pixel and control point by the transformation calculations to the first transformation equation and the second transformation equation
Third transformation equation；
11st, based on the third transformation equation that the tenth step is established, true whole projected image is converted according to third
Equation carries out transformation calculations pixel-by-pixel, so that projected image is projected on annular screen completely；Perspective view is completed in this way
The geometric correction process of picture；
The subsequent then geometric correction result based on projected image carries out Fusion Edges and color consistency to projected image
With processing.
Claims (7)
1. a kind of large screen merges projecting method, including annular screen and the showroom of annular screen is installed, it is characterized in that:
Firstly, constructing the threedimensional model that the showroom reduces corresponding proportion using three-dimensional modeling method；
Second, the projected image of more projectors is spliced into using image split-joint method by whole projected image, and store diminution
Whole projected image result figure after corresponding proportion；
Third, the threedimensional model based on the showroom construct showroom partial 3 d coordinate system；
4th, it simulates whole projected image result figure and is directly incident upon the effect model on parallel screen；
5th, using the origin of showroom partial 3 d coordinate system as point of observation, several control points are extracted on annular screen
And several dominating pair of vertices should be in the same place on effect model；
6th, obtain the original of control point and same place with respect to showroom partial 3 d coordinate system respectively by software measurement tool
The distance of point, and stored；
7th, it is fitted to obtain between effect model and annular screen using least square method based on multiple groups control point and same place group
The first transformation equation；
8th, image coordinate system is constructed based on whole projected image result figure, and store same place in image coordinate system
In pixel coordinate value；
9th, the second transformation equation is established based on identical point coordinates value and pixel coordinate value；
Tenth, the third between pixel coordinate value and coordinate value of control point is obtained based on the first transformation equation and the second transformation equation
Transformation equation；
11st, based on the third transformation equation that the tenth step is established, to true whole projected image according to third transformation equation
Transformation calculations pixel-by-pixel are carried out, so that projected image is projected on annular screen completely；Projected image is completed in this way
Geometric correction process.
2. large screen according to claim 1 merges projecting method, it is characterized in that: the showroom partial 3 d coordinate system
For system using the center of showroom as coordinate origin, the width direction of showroom is horizontal axis, and the length direction of showroom is vertical pivot,
The short transverse of showroom is the longitudinal axis, and is constructed using the length after practical one meter of distance diminution corresponding proportion as unit length.
3. large screen according to claim 2 merges projecting method, it is characterized in that: described image coordinate system is with an image left side
Inferior horn is origin, and picture traverse direction is horizontal axis, and image length direction is the longitudinal axis, and single pixel is unit building.
4. large screen according to claim 3 merges projecting method, it is characterized in that: along the lateral central axes of annular screen
Annular screen is divided into four the small screen with longitudinal central axis line, and is control with four angle points of four the small screen and central point
Point records control point in the coordinate value of showroom partial 3 d coordinate system.
5. large screen according to claim 4 merges projecting method, it is characterized in that: using with showroom partial 3 d coordinate
The origin of system is point of observation, connects point of observation and control point and the direct drop shadow effect's model phase of projected image on annular screen
It meets at a bit, which is the method for the same place at control point on annular screen, successively finds out the same place at control point, and respectively
Record the coordinate value of control point and same place in showroom partial 3 d coordinate system.
6. large screen according to claim 5 merges projecting method, it is characterized in that: the coordinate based on control point and same place
Value, is fitted to obtain the first transformation side between annular screen and the direct drop shadow effect's model of projected image using least square method
Journey.
7. large screen according to claim 6 merges projecting method, it is characterized in that: extracting image coordinate based on effect model
The corresponding pixel of same place and pixel coordinate, establish image coordinate system and exhibition based on pixel coordinate and identical point coordinates in system
Show the second transformation equation between the partial 3 d coordinate system of the Room.
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| CN108983963B (en) * | 2018-06-07 | 2021-03-26 | 吉利汽车研究院（宁波）有限公司 | Vehicle virtual reality system model establishing method and system |
| CN110035275B (en) * | 2019-03-27 | 2021-01-15 | 苏州华恒展览设计营造有限公司 | Urban panoramic dynamic display system and method based on large-screen fusion projection |
| CN110708525A (en) * | 2019-10-15 | 2020-01-17 | 四川川大智胜软件股份有限公司 | Correction fusion method and device based on scene modeling light path design |
| CN112004073B (en) * | 2020-08-07 | 2021-11-02 | 山东金东数字创意股份有限公司 | System and method for different-surface fusion image interaction based on window platform |
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| CN104038748A (en) * | 2014-05-13 | 2014-09-10 | 中国人民解放军68029部队 | Multichannel data fusion correction method |
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| US20120156652A1 (en) * | 2010-12-16 | 2012-06-21 | Lockheed Martin Corporation | Virtual shoot wall with 3d space and avatars reactive to user fire, motion, and gaze direction |
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| CN102778807A (en) * | 2012-08-09 | 2012-11-14 | 深圳艾特凡斯智能科技有限公司 | Method for distortion correction and multi-picture fusion of curved screen |
| CN102945564A (en) * | 2012-10-16 | 2013-02-27 | 上海大学 | True 3D modeling system and method based on video perspective type augmented reality |
| CN103134478A (en) * | 2013-02-01 | 2013-06-05 | 河海大学 | Streetscape image stereoscopic model space orientation method based on direction line segment |
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