CN102096949A - 360-degree fulldome digital movie making method - Google Patents
360-degree fulldome digital movie making method Download PDFInfo
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- CN102096949A CN102096949A CN2011100294586A CN201110029458A CN102096949A CN 102096949 A CN102096949 A CN 102096949A CN 2011100294586 A CN2011100294586 A CN 2011100294586A CN 201110029458 A CN201110029458 A CN 201110029458A CN 102096949 A CN102096949 A CN 102096949A
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- 238000004422 calculation algorithm Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 4
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Abstract
The invention discloses a 360-degree fulldome digital movie making method, which solves the problem that conventional three-dimensional animation software cannot directly create fulldome pictures. In the method, a virtual digital fisheye in the three-dimensional animation software is technically developed, and mapping angle relationships between points and an elliptic paraboloid are calculated according to a mathematic program in the software to acquire planar image data in different field angle ranges and finally recover circular fisheye images onto a fulldome with an equal angle ratio to realize image pictures without tensile deformation.
Description
Technical field
The present invention relates to digital movie method for making field, relate in particular to a kind of method for making of using computer three-dimensional animation to make software development 360 number of degrees word spherical screen stereoscopic films.
Background technology
Spherical screen stereoscopic film claims " circle vault film " or " vault curtain film ", a kind of big screen film that occur the seventies in 20th century again.Take and show and all adopt super wide-angle fish eye lens, the auditorium is a dome type structure, and screen is semisphere, and spectators are wherein besieged, look screen as the firmament.Because the screen image is big and clear, in face of spectators, be extended down to after one's death, and, make spectators as puting oneself in the midst of with stereo ring sound, Presence is very strong, and can break away from the anaglyph spectacles and the helmet, produces stereoscopic vision.
Because being super wide-angle fish eye lens, traditional spherical screen stereoscopic film picture takes gained, a lot of limitation is arranged in the making, yet three-dimensional animation extensively applies to many industries already as this form of expression of virtual reality, it can be by after giving material light to virtual three-dimensional stereo model, in the scenes for plot that configures, carry out Performance Animation, can vividly remove to show the virtual world that all mankind are unknown and can't take flexibly, can show the mankind world of being beyond one's reach over, future world, microworld, all expressive subject matters such as the outer space world, its performance potentiality are restricted hardly.Early stage spherical screen stereoscopic film is used in the space arenas, shows the astronomical phenomena film with the digital astronomical phenomena instrument at first, along with the expansion of the abundant and film subject matter of astronomical phenomena film form, has become the target of insider's pursuit based on the digital spherical screen making technology of computer graphics.
Yet, comparatively ripe in the market main flow three-dimensional animation making software is as (MAYA, XSI, 3DS MAX) etc. the face of playing up only can be provided is the picture of plane (PLAN) to many software, the digitized video of the no stretcher strain that can not directly produce on spherical screen to be throwed, make in the software only to form roundness image in three-dimensional by a plurality of picture splicings, but its manufacturing process very complicated, and on spherical screen, go back original picture and also can have problems such as having an X-rayed incorrect and picture distortion, also need the cooperation of many projection equipments, and different projection seat in the plane, it is reflected that the straightening of image requires to have nothing in common with each other, based on cost, make the consideration of each side factors such as flow process.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of method for making of 360 number of degrees word spherical screen stereoscopic films, problem such as manufacturing process very complicated when being intended to solve existing three-dimensional software and generating ball curtain image.
Technical scheme of the present invention is as follows: a kind of method for making of 360 number of degrees word spherical screen stereoscopic films, wherein, adopt the angle projective method to realize virtual fish-eye algorithm, its concrete steps are: by mathematics formula coding simulation optics fish eye lens, in crevice projection angle, the flake picture that has been out of shape is pushed and be out of shape, be converted to smooth spherical diagram and look like to export, the degree of deformation of described spherical diagram picture meets described mathematics formula coding.
The method for making of described 360 number of degrees word spherical screen stereoscopic films wherein, is that the concrete steps of smooth spherical diagram picture are as follows with the flake picture conversion of being out of shape:
S100, obtain the coordinate of each pixel of flake video camera imaging plane;
S200, obtain the height and width of flake video camera imaging plane;
The center point coordinate of S300, calculating imaging plane;
S400, calculate the air line distance of each pixel to central point;
The radius of S500, calculating imaging region;
S600, will calculate each pixel carry out standardization to the air line distance of central point;
S700, the air line distance after the standardization is out of shape to revise obtains correction factor;
S800, adopt the correction factor of each pixel self that pixel is carried out convergent-divergent, obtain smooth view data.
The method for making of described 360 number of degrees word spherical screen stereoscopic films, wherein, with calculate each pixel carry out standardized concrete grammar to the air line distance of central point and be: D=d/ (width/2), wherein, D is the air line distance after the standardization; D is the air line distance of pixel to central point; Width is the wide of flake video camera imaging plane.
The method for making of described 360 number of degrees word spherical screen stereoscopic films, wherein, the air line distance after the standardization is out of shape revises the concrete grammar obtain correction factor and be: K=1-hermite (0,1,0, PI, D), wherein, K is a correction factor; Hermite is the Hermite algorithm; PI is a circular constant; D is the air line distance after the standardization.
Beneficial effect: 360 number of degrees word ball-screen cinema making methods provided by the invention, solve present three-dimensional animation software and can not directly create the problem of ball curtain picture, in the present invention, by to the fish-eye technological development of virtual digit in the three-dimensional animation software, in software, calculate a little mapping angular relationship with elliptic paraboloid by the mathematics formula, to get access to the plane picture data in different subtended angle scopes, the most circular fish eye images reduction realizes the image frame of no stretcher strain on the ball curtain of angle geometric ratio.
Description of drawings
Fig. 1 is that the present invention realizes virtual fish-eye numeral and optics basic principle synoptic diagram.
Fig. 2 is the process flow diagram of the method for making of 360 number of degrees word spherical screen stereoscopic films provided by the invention.
Fig. 3 is the spherical screen stereoscopic film structural representation that the embodiment of the invention one provides.
Fig. 4 is the spherical screen stereoscopic film structural representation that the embodiment of the invention two provides.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.
Existing ball curtain image works are by be spliced into (the abbreviation: the splicing method) that spherical method completes by a plurality of pictures, the deficiency of this method for making is that the highest ken angle can not surpass 180 °, and it is more loaded down with trivial details to be output into the process of roundness image behind the multi-picture splicing.If can replace fish eye lens in the projection equipment of reality with a virtual super wide-angle fish eye lens, directly generate the ball curtain image of correct rectification, obtain and can show the image that all can show in the ball screen cinema of condition in difference.
The present invention makes on the software in three-dimensional and makes research and development, replace fish eye lens in the real projection equipment with a virtual super wide-angle fish eye lens, directly generate the ball curtain image of the correct rectification of the ball screen cinema projection that is fit to different projection conditions, utilizing the principle of light high distortion is developed virtual fish eye lens is method the most efficiently and effectively.
At present, existing digital movie is made the groupware of platform based on autodesk, inc., as Maya and 3DS MAX.And the renderer platform that can provide have Renderman,
V-Ray
,Turtle, Mentalray etc. based on extensive popularization and the use in global digital movie industry of the Mentalray renderer of present Mentailmages company, have just developed Mentalray and have played up Fish eye len shader under the platform.
The algorithm that virtual fish eye lens of the present invention adopts is the angle projective method: the method is by encode the fish-eye a kind of numerical approach of simulated optical with the mathematics formula, the video that has been out of shape is converted to image smooth on the sphere exports, make its spherical diagram distortion of image degree meet this mathematics formula coding.Can guarantee that crevice projection angle changes flexibly in 360 degree effective ranges, also solve and made drawbacks such as picture display effect disunity, cost cost height, construction maintenance inconvenience with many projector.
Renderer of the present invention (Shader) is the algorithm by the angle projection, effectively in the crevice projection angle flake picture is being carried out scientific and reasonable extruding and distortion, and this flake visual angle (FOV) can reach 360 degree in theory.
Realize virtual fish-eye numeral of the present invention and optics basic principle as shown in Figure 1, n is the ray from initial point among the figure, and P is the intersection point of ray n and elliptic paraboloid, and d is a radius of a circle.This equation is that the point of the P on the elliptic paraboloid is mapped on the round P ＇ point, and the point on the elliptic paraboloid all satisfies this mapping equation:
Referring to Fig. 2, virtual fish-eye essence is that the video that flake has been out of shape is converted to smooth image output, and its concrete steps are as follows:
S100, obtain each pixel p of flake video camera imaging plane coordinate (x, y);
S200, the high height that obtains imaging plane and wide width;
The central point e of S300, calculating imaging plane, wherein, e=(width/2, height/2);
S400, the air line distance d of calculating from pixel p coordinate to central point e, wherein, d=mag (p), wherein mag is the algorithm of a kind of p of calculating point to the air line distance of central point, is well known to those skilled in the art, and does not repeat them here;
The radius R of S500, calculating imaging region, wherein R=width/2;
S600, will calculate each pixel carry out standardization to the air line distance d of central point, its computing formula is: D=d/ (width/2), D are the air line distance after the standardization;
S700, the air line distance D after the standardization is out of shape correction, obtains correction factor K, its computing formula is: K=1-hermite (0,1,0, PI, D), hermite is the Hermite algorithm, PI is a circular constant, is well known to those skilled in the art, and does not repeat them here;
S800, adopt the correction factor K of each pixel self that pixel is carried out convergent-divergent at last, promptly the pixel behind the convergent-divergent be (x*K, y*K).
More than be based on the implementation method of mentalray, its partial code is as follows:
point?pp?=?transform(spacename,?p)?*?freq;
point?thiscell?=?point(floor(xcomp(pp))+0.5,
floor(ycomp(pp))+0.5,
floor(zcomp(pp))+0.5);
float?dist2nearest?=?1000;
uniform?float?i,j,k;
for(i?=?-1;?i?<=?1;?i+=?1)
for(j?=?-1;?j?<=?1;?j+=?1)
for(k?=?-1;?k?<=?1;?k+=?1)
{
point?testcell?=?thiscell?+?vector(i,j,k);
point?pos?=?testcell?+?vector?cellnoise(testcell)-0.5;
float?dist?=?distance(pos,pp);
if(dist?<?dist2nearest)
dist2nearest?=?dist;
}
if?{?$n?<=?0?}?{
set?X?[expr?$x0?+?($xi?+?$yi)/2]
set?Y?[expr?$y0?+?($xj?+?$yj)/2]
puts?"$X?$Y?0?"
}?else?{
set?XI?[expr?$xi/2]
set?XJ?[expr?$xj/2]
set?YI?[expr?$yi/2]
set?YJ?[expr?$yj/2]
hilbert?$x0 $y0
$YI $YJ $XI $XJ?[expr?$n?-?1]
hilbert?[expr?$x0+$XI] [expr?$y0+$XJ]
$XI $XJ $YI $YJ?[expr?$n?-?1]
hilbert?[expr?$x0+$XI+$YI]?[expr?$y0+$XJ+$YJ]
$XI $XJ $YI $YJ?[expr?$n?-?1]
hilbert?[expr?$x0+$XI+$yi]?[expr?$y0+$XJ+$yj]?–
$YI?-$YJ?-$XI?-$XJ?[expr?$n?-?1]
}
}
while?{?[gets?stdin?args]?!=?-1?}?{
set?pixels?[lindex?$args?0]
set?ctype [lindex?$args?1]
set?reps [lindex?$args?2]
set?width [lindex?$args?3]
set?cvs?[expr?int(pow(4,?$reps))]
hilbert?0.0 0.0 1.0 0 0 1.0?$reps
}
Shader of the present invention encodes by C++ based on the Maya platform, follows the conventional development process of Mentalray Shader, is written into just with card format and can moves this script.
The maximum visual angle of hardware fish eye lens generally can reach 220 ° or 300 °, and virtual fish eye lens of the present invention visual angle can cooperate hardware device to do reasonable change in 360 ° of scopes, whole world curtain project with 30 meters of diameters is an example below, uses virtual fish eye lens of the present invention to realize 360 number of degrees word spherical screen stereoscopic films.
Embodiment 1
Referring to Fig. 3, described whole world curtain motion picture projection demo system comprises whole world curtain 3, watches platform 5, is provided with outlet 4 in the described both sides of platform 5 of watching, go out to be provided with stair 6 in outlet 4 and receive ground, be provided with first fish eye lens 1 and second fish eye lens 2 in the described top of platform 5 and the bottom watched.With 2 220 degree hardware fish eye lenses with the position of the non-geometric ratio of the centre of sphere longitudinal axis up and down to throwing, the picture integration region is being watched the visual non-central zone of platform 5.In the present embodiment, watch about about 205 square meters of area of platform 5.To up and down 2 hardware fish eye lens positions of throwing having been carried out clearly, and whole global project structure is made sign.
Its advantage of this scheme is to use 2 fish eye lens projections of equal angular, the skimble-scamble optical parallax of picture luminosity can not appear in its picture, and the splicing of the integration region of two camera lenses can realize the fusion of seamless no stretcher strain, in addition, 2 fish-eye integration regions 2 skimble-scamble problems of camera lens splicing place picture effect can not occur not in spectators' primary visual area territory.
Embodiment 2
Referring to Fig. 4, another motion picture projection demo system provided by the invention comprises rectangle curtain 11, watches platform 5, is provided with outlet 4 in the described both sides of platform 5 of watching, go out to be provided with stair 6 in outlet 4 and receive ground, be respectively arranged with three projectors in the described top of platform and the bottom watched, first projector 21, second projector 22 and the 3rd projector 23 are arranged on the top, carry out the top and about the projection of three directions; The 4th projector 24, the 5th projector 25 and the 6th projector 26 are arranged on the bottom, carry out the below and about the projection of three directions.In the present embodiment, adopt 6 projectors with the position of the non-geometric ratio of the centre of sphere longitudinal axis up and down to throwing, the picture integration region is in the visual non-central zone of spectators' platform, in the scheme about about 205 square meters of the area of spectators' platform.To up and down 6 projector positions of throwing having been carried out clearly, and whole comprehensive huge act of project structure made sign.
Its advantage of this scheme is to use 6 identical projector's projections, optical parallaxs such as picture luminosity disunity can not appear in its picture, and the splicing of the integration region of 6 camera lenses can realize the fusion of seamless no stretcher strain, in addition, the integration region of 6 projector lens 6 problems such as camera lens splicing place picture effect disunity can not occur not in spectators' primary visual area territory.
360 number of degrees word ball-screen cinema making methods provided by the invention, solve present three-dimensional animation software and can not directly create the problem of ball curtain picture, in the present invention, by to the fish-eye technological development of virtual digit in the three-dimensional animation software, in software, calculate a little mapping angular relationship with elliptic paraboloid by the mathematics formula, to get access to the plane picture data in different subtended angle scopes, the most circular fish eye images reduction realizes the image frame of no stretcher strain on the ball curtain of angle geometric ratio.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (4)
1. the method for making of a number of degrees word spherical screen stereoscopic film, it is characterized in that, adopt the angle projective method to realize virtual fish-eye algorithm, its concrete steps are: by mathematics formula coding simulation optics fish eye lens, in crevice projection angle, the flake picture that has been out of shape is pushed and be out of shape, be converted to smooth spherical diagram and look like to export, the degree of deformation of described spherical diagram picture meets described mathematics formula coding.
2. the method for making of 360 number of degrees word spherical screen stereoscopic films according to claim 1 is characterized in that, is that the concrete steps of smooth spherical diagram picture are as follows with the flake picture conversion of being out of shape:
S100, obtain the coordinate of each pixel of flake video camera imaging plane;
S200, obtain the height and width of flake video camera imaging plane;
The center point coordinate of S300, calculating imaging plane;
S400, calculate the air line distance of each pixel to central point;
The radius of S500, calculating imaging region;
S600, will calculate each pixel carry out standardization to the air line distance of central point;
S700, the air line distance after the standardization is out of shape to revise obtains correction factor;
S800, adopt the correction factor of each pixel self that pixel is carried out convergent-divergent, obtain smooth view data.
3. the method for making of 360 number of degrees word spherical screen stereoscopic films according to claim 1 is characterized in that, with calculate each pixel carry out standardized concrete grammar to the air line distance of central point and be:
D=d/(width/2)，
Wherein, D is the air line distance after the standardization; D is the air line distance of pixel to central point; Width is the wide of flake video camera imaging plane.
4. the method for making of 360 number of degrees word spherical screen stereoscopic films according to claim 1 is characterized in that, the air line distance after the standardization is out of shape revises the concrete grammar obtain correction factor and be:
K=1-hermite(0,1,0,PI,D)，
Wherein, K is a correction factor; Hermite is the Hermite algorithm; PI is a circular constant; D is the air line distance after the standardization.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438108A (en) * | 2011-10-13 | 2012-05-02 | 江苏尚阳数字科技有限公司 | Film processing method |
| CN105137705A (en) * | 2015-08-14 | 2015-12-09 | 太微图影（北京）数码科技有限公司 | Method and device for creating virtual dome screen |
| CN105469448A (en) * | 2014-09-11 | 2016-04-06 | 上海华博信息服务有限公司 | Manufacturing method for movie of irregularly-shaped screen |
| CN105652585A (en) * | 2016-03-21 | 2016-06-08 | 深圳市远望淦拓科技有限公司 | 360-degree panoramic dome cinema system |
| CN106570842A (en) * | 2016-11-10 | 2017-04-19 | 浙江大华技术股份有限公司 | Fisheye image correcting method and device |
| RU2686591C1 (en) * | 2015-08-18 | 2019-04-29 | Сони Интерактив Энтертейнмент Инк. | Image generation device and image display control device |
| CN109829870A (en) * | 2017-11-23 | 2019-05-31 | 河海大学 | Three-dimensional reproducing kernel space functional image synthetic method |
| CN111047711A (en) * | 2019-12-16 | 2020-04-21 | 山东东艺数字科技有限公司 | Immersive interactive Box image manufacturing method |
| CN112230771A (en) * | 2020-10-14 | 2021-01-15 | 福建至美空间工程设计有限公司 | Adopt interactive active outdoor scene of VR to experience device |
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| CN102438108B (en) * | 2011-10-13 | 2014-08-20 | 江苏尚阳数字科技有限公司 | Film processing method |
| CN102438108A (en) * | 2011-10-13 | 2012-05-02 | 江苏尚阳数字科技有限公司 | Film processing method |
| CN105469448A (en) * | 2014-09-11 | 2016-04-06 | 上海华博信息服务有限公司 | Manufacturing method for movie of irregularly-shaped screen |
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| CN105137705B (en) * | 2015-08-14 | 2017-09-22 | 太微图影（北京）数码科技有限公司 | A kind of creation method and device of virtual ball curtain |
| CN105137705A (en) * | 2015-08-14 | 2015-12-09 | 太微图影（北京）数码科技有限公司 | Method and device for creating virtual dome screen |
| US10659742B2 (en) | 2015-08-18 | 2020-05-19 | Sony Interactive Entertainment, Inc. | Image generating apparatus and image display control apparatus |
| RU2686591C1 (en) * | 2015-08-18 | 2019-04-29 | Сони Интерактив Энтертейнмент Инк. | Image generation device and image display control device |
| CN105652585A (en) * | 2016-03-21 | 2016-06-08 | 深圳市远望淦拓科技有限公司 | 360-degree panoramic dome cinema system |
| CN106570842A (en) * | 2016-11-10 | 2017-04-19 | 浙江大华技术股份有限公司 | Fisheye image correcting method and device |
| CN106570842B (en) * | 2016-11-10 | 2019-11-15 | 浙江大华技术股份有限公司 | A kind of antidote and device of fish eye images |
| CN109829870A (en) * | 2017-11-23 | 2019-05-31 | 河海大学 | Three-dimensional reproducing kernel space functional image synthetic method |
| CN109829870B (en) * | 2017-11-23 | 2020-10-02 | 河海大学 | Three-dimensional regeneration kernel space function image synthesis method |
| CN111047711A (en) * | 2019-12-16 | 2020-04-21 | 山东东艺数字科技有限公司 | Immersive interactive Box image manufacturing method |
| CN111047711B (en) * | 2019-12-16 | 2023-08-22 | 山东东艺数字科技有限公司 | Immersive interactive Box image manufacturing method |
| CN112230771A (en) * | 2020-10-14 | 2021-01-15 | 福建至美空间工程设计有限公司 | Adopt interactive active outdoor scene of VR to experience device |
| CN112230771B (en) * | 2020-10-14 | 2022-07-22 | 福建至美空间工程设计有限公司 | Adopt interactive active outdoor scene of VR to experience device |
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