CN1360283A - 3D model creating system for actual human head sculpture - Google Patents

Abstract

A system for creating the 3D model of a real human head sculpture is composed of a fringe projector, a camera, a human orientating seat and a reference screen. The first three constitute a plane. The optical axises of said projector and camera are in the plane. Said reference screen is perpendicular to said plane. The cross line of two planes is coincident with the rotation axle of a the human orientating seat.

Description

3 D model creating system for actual human head sculpture

Technical field

The present invention relates to actual human head sculpture three-dimensional information harvester, particularly 3 D model creating system for actual human head sculpture.

Background technology

When tradition is taken film or TV programme, all need the scene stage property, this often needs bigger input.Computer drawing technology develop rapidly at present, the scene stage property substitutes with regard to available three-dimensional model, has just formed virtual studio.But virtual studio has several big difficult points in the process of implementing, and (1) true people is difficult in the three-dimensional virtual scene and locatees; (2) each point more is difficult to the location on its limbs of back even true people locatees; (3) true people realizes with two-dimensional image in the movie and video programs, does not show shadow with virtual light, if do not show shadow again with true light in virtual scene, so scene and personage's shadow is difficult to unified.Be head it off, abroad research is a lot of in this respect in recent years, has formed Virtual Studio Technology.This technology mainly on equipment such as video camera, take following a lot of time in personage's the environment, its installation cost is considerable.And the sense of reality of effect of shadow is also not enough.We consider to set up three-dimensional true people's dummy model for this reason, are placed in the three-dimensional virtual scene to perform, and programme with the manufacture skill of virtual light, virtual video camera and some animations.The problems referred to above just have been readily solved like this.But how setting up three-dimensional true people's dummy model, is the key issue of implementing the method.Tribal chief's people shape of face attitude is again a people's of identification a key position in whole human body, do not form because portrait is not the simple geometric body, and precision is bigger, so difficulty is bigger.

Summary of the invention

The present invention has proposed the application system of the three-dimensional true human head picture dummy model of automatic foundation especially in order to overcome the above problems.The native system technical scheme is:

Actual human head sculpture three-dimensional information harvester, this device is made up of several parts of striped projectoscope (slide projector or projector etc.), digital camera (or general camera adds message input device), benchmark screen, orientation for person seat (personage can be in the fixed position, accurately the anglec of rotation).

The equipment mounting means: striped projectoscope, digital camera, orientation for person seat three form a plane, and the optical axis of striped projectoscope and camera is all on this plane; The benchmark screen is perpendicular to this plane, and the intersection on this two plane should overlap with the rotation axis of orientation for person seat.The striped that casts out should with the vertical Fig. 1 of opinion of this rotation axis.

Information collecting method is an image of clapping a benchmark screen with digital camera, claps the image that true man are sitting in the orientation for person seat again.All image input computers are got true man's three-dimensional information after treatment, call in the three dimensional virtual models that 3 d modeling software gets the photographed person.

This method is the deflection by striped, determines the information of the third dimension.See Fig. 1, T is a projectoscope among the figure, both has been the emergent pupil center of projection optical axis; C is a camera, both has been the entrance pupil center of camera; O is the object rotating shaft, P be body surface more arbitrarily.Point P be on the body surface a bit, also be light source light that sends and the intersection point of seeing sight line in the past from position of camera, known two straight-line equations, also the height value that just can order in the hope of P.

Determine two straight-line equations, need be by means of the intersection point of two straight lines and Y-axis.When not having object, actual light of order through P will intersect at M point with Y-axis and see Fig. 2, and pass through the modulation of object to striation, and seeing over the sight line that process P orders from camera will intersect at the N point with Y-axis.The displacement of being ordered to N by the M point is exactly the result of P point modulation striation, and this also is highly P of our the anti-P of asking point _zKey.More than setting is to be based upon on the basis of an ideal situation, and we are defined as ideal situation here: TC is parallel with the Y-axis of user coordinate system; Point T has identical z coordinate with C, and its distance can accurately be measured; The OC distance also can accurately be measured; The striation plane that projection goes out is perpendicular to plane TOC.

By to the prior demarcation of photograph that camera is clapped, M, N can be obtained by position shown on the photograph, set N (Nx, Ny, Nz), M (Mx, My, Mz), C (Cx, Cy, Cz), T (Tx, Ty, Tz), as shown in Figure 2:

Nx＝Mx＝Tx＝Cx＝0

Nz＝Mz＝0

Cy＝0

Ty＝d

Cz＝Tz＝1

Straight line CN equation: $k=\frac{\mathrm{Ny}-\mathrm{Cy}}{\mathrm{Nz}-\mathrm{Cz}}=\frac{\mathrm{Ny}-0}{0-l}=-\mathrm{Ny}/l$

c＝y-kz＝0-(-Ny/l) ^*l＝Ny

y＝kz+c＝-Ny/l ^*z+Ny (1)

Straight line TM equation: $k=\frac{\mathrm{My}-\mathrm{Ty}}{\mathrm{Mz}-\mathrm{Tz}}=\frac{\mathrm{My}-d}{0-l}=(d-\mathrm{My})/l$

c＝y-kz＝My-(d-My/l) ^*Mz＝My

y＝kz+c＝(d-My)/l ^*z+My (2)

Can solve P point height value P thus _z(making s=Ny-My): $P_z=\frac{l}{\frac{d}{\mathrm{Ny}-\mathrm{My}}+1}=\frac{l*s}{d+s}----\left(3\right)$

To get the actual Y value of P point in the Pz value substitution formula (1): $P_y=\mathrm{Ny}-\frac{\mathrm{Ny}}{\frac{d}{\mathrm{Ny}-\mathrm{My}}+1}=\frac{d}{d+s}*\mathrm{Ny}----\left(4\right)$

When the P point is not that at first, we suppose that this point is the optical plane TPP that is positioned at a certain striation place when being positioned on the TOC of plane ₁On, in addition, exist a sight line plane of crossing sight line CP perpendicular to plane TOC, cross optical plane that P orders simultaneously and also be perpendicular to plane TOC, so, the intersecting lens PP of two vertical planes ₁Also perpendicular to plane TOC, and intersect at P ₁Point, and be parallel to the plane X OY of X-axis and Y-axis supposes that this intersecting lens gives P1 mutually with plane TOC, sees Fig. 3.Therefore, by the diagram geometric relationship, at the straight line TP1 on the TOC of plane and CP1 just straight line TP and the projection line of CP on the TOC of plane, we know P point height value P _zP just ₁The point height value, the height value of ordering in the hope of this P sum up in the point that the P that asks on the TOC of plane again ₁The height value of point, thus can application of formula (3), formula (4) carries out corresponding calculated.

See Fig. 4, when body surface P point is beyond the TOC of plane, on photo P`, R is the intersection point of straight line PP` and X-axis, straight line PP`` vertical with X-axis (imaging plane actual should on C point the right), the P point X value that is obtained by P` point on the photograph is actually the coordinate that R is ordered, from figure we RPP`` and RCO are similar triangles as can be seen, so actual X value of P point: $\frac{\mathrm{Rx}-\mathrm{Px}}{\mathrm{Rx}}=\frac{\mathrm{Pz}}{\mathrm{Cz}}$ $P_x=\mathrm{Rx}*(1-\frac{\mathrm{Pz}}{\mathrm{Cz}})=\mathrm{Rx}*(1-\frac{\mathrm{Pz}}{l})=\frac{d}{c+s}*\mathrm{Rx}----\left(5\right)$

Native system can be applied in: (1) can be put into three-dimensional virtual scene with virtual three-dimensional true personage and cooperate existing cartoon technique in TV programme and Moviemaking, takes program with virtual light and virtual camera, saves greatly and makes investment.The performer there is safety assurance when taking thrilling scene especially; Effect of shadow is relatively coordinated Bi Zhen; Use when (2) can be used for theater, the director of chorus design program; (3) because device therefor is fairly simple, can be in children's palace, the exploitation child's of middle and primary schools intelligence and imagination.

Description of drawings

Fig. 1: alliance figure;

Fig. 2: alliance side view;

Fig. 3: alliance shaft side figure;

Fig. 4: alliance vertical view;

Fig. 5: actual human head sculpture striations figure;

Fig. 6: actual human head sculpture three-dimensional model diagram.

Embodiment

3 D model creating system for actual human head sculpture, this device shields the orientation for person seat O of XOY, rotatable 360 degree by striped projectoscope T, resolution digital camera C, the benchmark more than 300 everything elements, and can read the anglec of rotation.

The equipment mounting means is: striped projectoscope, digital camera, orientation for person seat three form a plane, and the optical axis of striped projectoscope and digital camera is all on this plane; The benchmark screen is perpendicular to this plane, and the intersection on this two plane should overlap with the rotation axis of orientation for person seat.The striped that casts out should be vertical with this rotation axis, as shown in Figure 1.

Information collecting method is an image of clapping a benchmark screen with digital camera, claps the image that true man are sitting in the orientation for person seat again, as shown in Figure 5.All image input computers are got true man's three-dimensional information after software processes, this software has been applied for the protection of computing machine copyright.Call in 3 d modeling software such as 3DSMAX and get three dimensional virtual models such as Fig. 6 of photographed person.

Claims (4)

1. 3 D model creating system for actual human head sculpture, this system is made up of striped projectoscope, number, benchmark screen, orientation for person seat; It is characterized by: striped projectoscope, camera, orientation for person seat three form a plane, and the optical axis of striped projectoscope and camera is all on this plane; The benchmark screen is perpendicular to this plane, and the intersection on this two plane should overlap with the rotation axis of orientation for person seat, and the striped that casts out should be vertical with this rotation axis.

2. a kind of 3 D model creating system for actual human head sculpture as claimed in claim 1, it is characterized by described camera is the digital camera of resolution more than 300 everything elements.

3. a kind of 3 D model creating system for actual human head sculpture as claimed in claim 1 is characterized by rotatable 360 degree of described orientation for person seat, and can read the anglec of rotation.

4. as the described a kind of 3 D model creating system for actual human head sculpture of claim 1 to 3, the image of a benchmark screen is clapped by the system of it is characterized by with digital camera, clap the image that true man are sitting in the orientation for person seat again, all image input computers are got true man's three-dimensional information after treatment, call in the three dimensional virtual models that 3 d modeling software gets the photographed person.

Images