CN102096949B - 360-degree fulldome digital movie making method - Google Patents
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- CN102096949B CN102096949B CN2011100294586A CN201110029458A CN102096949B CN 102096949 B CN102096949 B CN 102096949B CN 2011100294586 A CN2011100294586 A CN 2011100294586A CN 201110029458 A CN201110029458 A CN 201110029458A CN 102096949 B CN102096949 B CN 102096949B
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- 238000000034 method Methods 0.000 title claims abstract description 28
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- 238000004422 calculation algorithm Methods 0.000 claims description 8
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- 238000006243 chemical reaction Methods 0.000 claims description 3
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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 again " circle vault film " or " vault curtain film ", a kind of large screen film that 20 century 70s occur.Take and projection all adopts super wide-angle fish eye lens, auditorium is dome type structure, and screen is semisphere, and spectators are wherein besieged, depending on screen as the firmament.Because the screen image is large and clear, be extended down to after one's death in face of spectators, and, with stereo ring sound, make spectators as put oneself in the midst of, Presence is very strong, and can break away from anaglyph spectacles and the helmet, produces stereoscopic vision.
Because traditional spherical screen stereoscopic film picture is that super wide-angle fish eye lens is taken gained, a lot of limitation is arranged in making, yet three-dimensional animation extensively applies to many industries already as this form of expression of virtual reality, after it can give material light by the three-dimensional stereo model to virtual, carry out Performance Animation in the scenes for plot set, can vividly remove flexibly to show the virtual world that all mankind are unknown and can't take, 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, and along with the expansion of the abundant and film subject matter of astronomical phenomena film form, the digital ball screen making technology based on computer graphics has become the target of insider's pursuit.
Yet, comparatively ripe main flow three-dimensional animation making software is as (MAYA in the market, XSI, 3DS MAX) etc. many software only can provide the picture that the face of playing up is plane (PLAN), can not directly produce the digitized video without stretcher strain projected on spherical screen, form roundness images to pass through a plurality of picture splicings only in d-making software, but its manufacturing process very complicated, and go back original picture and also can have problems such as having an X-rayed incorrect and picture distortion on spherical screen, also need the cooperation of many projection equipments, and different projection seat in the plane, it is reflected to the straightening of image requires different, based on cost, make the consideration of the 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, the 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 be out of shape is pushed and is out of shape, be converted to smooth spherical diagram and look like to be exported, 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, the concrete steps that are smooth spherical diagram picture by the flake picture conversion of being out of shape are as follows:
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 standardization is out of shape to revise obtains correction factor;
S800, adopt the correction factor of each pixel self to carry out convergent-divergent to pixel, obtain smooth view data.
The method for making of described 360 number of degrees word spherical screen stereoscopic films, wherein, by 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 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 standardization is out of shape and is revised the concrete grammar obtain correction factor and be: K=1-hermite (0,1,0, PI, D), wherein, K is correction factor; Hermite is the Hermite algorithm; PI is circular constant; D is the air line distance after standardization.
Beneficial effect: 360 number of degrees word ball-screen cinema making methods provided by the invention, solve the problem that current Three-dimensional Animation Software can not directly create ball curtain picture, in the present invention, by to the fish-eye technological development of virtual digit in Three-dimensional Animation Software, calculate some the mapping angular relationship with elliptic paraboloid by the mathematics formula in software, to get the plane picture data in different subtended angle scopes, the most circular fish eye images reduction, on the ball curtain of angle geometric ratio, realizes the image frame without stretcher strain.
The accompanying drawing explanation
Fig. 1 is that the present invention realizes virtual fish-eye numeral and optics basic principle schematic 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 present invention one provides.
Fig. 4 is the spherical screen stereoscopic film structural representation that the embodiment of the present invention two provides.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, referring to accompanying drawing, developing simultaneously, the present invention is described in more detail for embodiment.
Existing ball curtain image works are the (abbreviations: the splicing method) that completed by be spliced into spherical method 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 after multi-picture splicing.If can replace the fish eye lens in real projection equipment with a virtual super wide-angle fish eye lens, directly generate the ball curtain image of correct rectification, obtain showing the image that all can show in the ball screen cinema of condition in difference.
The present invention makes research and development on d-making software, replace the fish eye lens in 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 applicable to different projection conditions, utilizing the principle of light high distortion is developed to virtual fish eye lens is method the most efficiently and effectively.
At present, existing digital movie is made platform and be take the groupware of autodesk, inc. as main, as Maya and 3DS MAX.And the renderer platform that can provide have Renderman,
v-Ray
,turtle, Mentalray etc., the Mentalray renderer based on current Mentailmages company, in extensive popularization and the use of global digital movie industry, has just been developed Fish eye len shader under the Mentalray rendering 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 by the mathematics formula, the video be out of shape is converted to image smooth on sphere and is exported, 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 the drawbacks such as picture display effect disunity, the cost cost is high, construction maintenance is inconvenient with many projector.
Renderer of the present invention (Shader) is the algorithm projected by angle, effectively in crevice projection angle, the flake picture is being carried out to 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, in figure, n is the ray from initial point, the intersection point that P is ray n and elliptic paraboloid, and d is radius of a circle.This equation is that the point of the P on elliptic paraboloid is mapped on round P ＇ point, and the point on elliptic paraboloid all meets 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 the coordinate (x, y) of each pixel p of flake video camera imaging plane;
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 is the air line distance after standardization;
S700, the air line distance D after standardization is out of shape to correction, obtains adjusted coefficient K, its computing formula is: K=1-hermite (0,1,0, PI, D), hermite is the Hermite algorithm, PI is circular constant, is well known to those skilled in the art, and does not repeat them here;
S800, finally adopt the adjusted coefficient K of each pixel self to carry out convergent-divergent to pixel, the pixel after convergent-divergent is (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, with card format, is written into just 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 coordinate hardware device to do reasonable change in 360 ° of scopes, the whole world curtain project of 30 meters of diameters of below take is example, with virtual fish eye lens of the present invention, realizes 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, in the described both sides of platform 5 of watching, is provided with outlet 4, go out to be provided with stair 6 in outlet 4 and receive ground, in the described top of platform 5 and the bottom watched, be provided with the first fish eye lens 1 and the second fish eye lens 2.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 the area of platform 5 approximately about 205 square meters.To up and down 2 hardware fish eye lens positions of throwing having been carried out clearly, and whole global project structure is made to sign.
Its advantage of this scheme is to use 2 fish eye lens projections of equal angular, its picture not there will be the skimble-scamble optical parallax of picture luminosity, and the splicing of the integration region of two camera lenses can realize the seamless fusion without stretcher strain, in addition, 2 fish-eye integration regions, or not spectators' primary visual area territory, not there will be 2 skimble-scamble problems of camera lens splicing place picture effect.
Embodiment 2
Referring to Fig. 4, another motion picture projection demo system provided by the invention comprises rectangle curtain 11, watches platform 5, in the described both sides of platform 5 of watching, is provided with outlet 4, 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, the first projector 21, the second projector 22 and the 3rd projector 23 are arranged on top, carry out the projection of top and three directions in left and right; The 4th projector 24, the 5th projector 25 and the 6th projector 26 are arranged on bottom, carry out the projection of below and three directions in left and right.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 non-central zone that the picture integration region is visual at spectators' platform, the about 205 square meters left and right of the area of spectators' platform in scheme.To up and down 6 projector positions of throwing having been carried out clearly, and whole comprehensive huge curtain project structure is made to sign.
Its advantage of this scheme is to use 6 identical projector's projections, its picture not there will be the optical parallaxs such as picture luminosity disunity, and the splicing of the integration region of 6 camera lenses can realize the seamless fusion without stretcher strain, in addition, the integration region of 6 projector lens, or not spectators' primary visual area territory, not there will be 6 problems such as camera lens splicing place picture effect disunity.
360 number of degrees word ball-screen cinema making methods provided by the invention, solve the problem that current Three-dimensional Animation Software can not directly create ball curtain picture, in the present invention, by to the fish-eye technological development of virtual digit in Three-dimensional Animation Software, calculate some the mapping angular relationship with elliptic paraboloid by the mathematics formula in software, to get the plane picture data in different subtended angle scopes, the most circular fish eye images reduction, on the ball curtain of angle geometric ratio, realizes the image frame without stretcher strain.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (1)
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 be out of shape is pushed and is out of shape, be converted to smooth spherical diagram and look like to be exported, the degree of deformation of described spherical diagram picture meets described mathematics formula coding;
The concrete steps that are smooth spherical diagram picture by the flake picture conversion of being out of shape are as follows:
S100, obtain the coordinate (x, y) of each pixel p of flake video camera imaging plane;
S200, the high height that obtains flake video camera imaging plane and wide width;
The center point coordinate e of S300, calculating imaging plane, wherein, e=(width/2, height/2);
S400, calculate the air line distance d of each pixel p to central point e, wherein, d=mag (p);
The radius R of S500, calculating imaging region, wherein R=width/2;
S600, will calculate each pixel p carry out standardization: D=d/ (width/2) to the air line distance of central point e, wherein, D is the air line distance after standardization;
S700, the air line distance D after standardization is out of shape to revise obtains adjusted coefficient K; K=1-hermite (0,1,0, PI, D), wherein, K is correction factor; Hermite is the Hermite algorithm; PI is circular constant;
S800, adopt the adjusted coefficient K of each pixel self to carry out convergent-divergent to pixel, obtain smooth view data (x*K, y*K).
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN105469448B (en) * | 2014-09-11 | 2018-01-12 | 上海华博信息服务有限公司 | A kind of special-shaped curtain Moviemaking method |
| 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 |
| JP6672315B2 (en) * | 2015-08-18 | 2020-03-25 | 株式会社ソニー・インタラクティブエンタテインメント | 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 |
| 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 |
| CN109829870B (en) * | 2017-11-23 | 2020-10-02 | 河海大学 | 3D Regenerated Kernel Space Function Image Synthesis 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 |
| 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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| CN1372227A (en) * | 2001-02-28 | 2002-10-02 | 深圳华强智能技术有限公司 | Method for making digital circular screen stereo movia |
| CN101807311A (en) * | 2010-01-26 | 2010-08-18 | 深圳市远望淦拓科技有限公司 | Making method of digital spherical screen stereoscopic film |
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| JP3744002B2 (en) * | 2002-10-04 | 2006-02-08 | ソニー株式会社 | Display device, imaging device, and imaging / display system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1372227A (en) * | 2001-02-28 | 2002-10-02 | 深圳华强智能技术有限公司 | Method for making digital circular screen stereo movia |
| CN101807311A (en) * | 2010-01-26 | 2010-08-18 | 深圳市远望淦拓科技有限公司 | Making method of digital spherical screen stereoscopic film |
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