CN106710003A - Three-dimensional photographing method and system based on OpenGL ES (Open Graphics Library for Embedded System) - Google Patents
Three-dimensional photographing method and system based on OpenGL ES (Open Graphics Library for Embedded System) Download PDFInfo
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Abstract
The invention discloses a three-dimensional photographing method based on an OpenGL ES (Open Graphics Library for Embedded System). The three-dimensional photographing method comprises the following steps: S01, constructing a three-dimensional model geometric body by utilizing modeling software, and storing the three-dimensional model geometric body into a storage device of mobile equipment; S02, obtaining a video image by utilizing a camera of the mobile equipment; positioning the position of a human face through a human face identification and tracking method, so as to obtain video image data; S03, analyzing the three-dimensional model geometric body by utilizing a central processing unit of the mobile equipment, so as to obtain analyzed data; S04, drawing a three-dimensional model by utilizing the analyzed data through the OpenGL ES; S05, mixing the video image data and the three-dimensional model by utilizing an OpenGL ES mixing mode, and finally rendering a final scene with the three-dimensional model; S06, displaying the final scene to a user through a display device of the mobile equipment. According to the three-dimensional photographing method disclosed by the invention, a figure in a video and a virtual three-dimensional object are combined to be displayed together, so that the interestingness of photographing is increased, a responding speed is rapid and the rendering efficiency is high.
Description
Technical field
The invention belongs to graph processing technique field, more particularly to a kind of three-dimensional photographic method based on OpenGL ES
And system.
Background technology
Current mobile phone photograph has become main flow, and what most people was away from home take pictures, and instrument is all only required to be a mobile phone
Just can complete.The mobile phone photograph how is allowed to become more interesting, it is more joyful, become the need outside being taken pictures for basis for people
Ask.
Abundant beautification is carried out to photo using various softwares of taking pictures more than current people, most common of which is to add in the picture
Enter foreground image；And combined using by the figure picture in two dimensional image and video image more than existing prospect beautification mode, to reach
To the purpose of display foreground beautification, but two dimensional image is more inflexible, and entertaining performance is low；And existing three-dimensional geometry body is rendered
Means speed causes that rendering efficiency is low slowly.
The content of the invention
In order to solve the above problems, the present invention proposes a kind of three-dimensional photographic method and system based on OpenGL ES, will
Personage's combined with virtual three-dimensional body together appearance in video, increased the interest taken pictures, and fast response time, rendering efficiency
It is high.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of three-dimensional photographic method based on OpenGL ES, including step,
S01, builds three-dimensional model geometric body, and three-dimensional model geometric body is stored in into depositing for mobile device using modeling software
In reservoir；
S02, video image is obtained using the camera of mobile device, and by recognition of face and method for tracing locating human face
Position, obtains vedio data；
S03, three-dimensional model geometric body is parsed by the central processing unit of mobile device, obtains parsing data；
S04, OpenGL ES are utilized and are parsed data drawing three-dimensional model；
S05, is mixed vedio data and threedimensional model using OpenGL ES mixed modes, and final rendering
Go out the final scene with threedimensional model；
S06, user is showed by final scene by the display device of mobile device.
It is further that modeling software described in step S01 is Maya modeling softwares, the software is the three-dimensional of market main flow
Modeling software, universal performance is strong；In modeling process, texture mapping is carried out to the three-dimensional model geometric body, added when there is animation
Upper Skeletal Skinned Animation, makes three-dimensional model geometric body more lifelike image.
It is further that recognition of face is in step S02 with method for tracing process, analyzes camera video image data,
Identification face and track human faces, obtain on human face data, and the human face data includes eye position data, face position data
With the 3 d pose data of face；Video image and human face data are combined into view data, are that threedimensional model synthesis is prepared.
It is further that data are parsed described in step S03 includes vertex data, index data, texture coordinate and bone
Animation data covering weights, are that OpenGL ES render offer basic data.
It is further that OpenGL ES drawing three-dimensional solids, including step are used in step S04：
Interface is uploaded using the vertex data of OpenGL ES to upload in graphic process unit with to be rendered vertex data；
Index data is uploaded to graphic process unit, corresponding vertex data is found in vertex data according to index data
To be organized into corresponding threedimensional model；Because the data volume of threedimensional model is generally huger, this step is mainly used in saving number
According to amount, accelerate technical speed；
Texture coordinate is uploaded to graphic process unit, and uses texture coordinate map texture image, obtain textured image
Threedimensional model；This step causes the more life-like of threedimensional model；
If threedimensional model carries animation, by Skeletal Skinned Animation data real-time update vertex data, more than circulation walk
Suddenly the threedimensional model with animation is obtained；This step causes the more life-like of threedimensional model, real-time update threedimensional model.
It is further that view data is mixed with three-dimensional geometry body according to OpenGL ES mixing in step S05
Close, including step：OpenGL ES mixed modes are set and simultaneously open depth test, with a layer pattern render video view data, this
The picture element unit that individual figure layer is made up of 4 vertex datas and 4 texture coordinates；Reuse the three-dimensional modeling data after parsing
Renders three-dimensional model；Threedimensional model with multiple networks composition, renders respectively to each network；Then Alpha is used
Hybrid mode is rendered and obtains the final scene with threedimensional model.
It is further also to include step after S06：According to the three-dimensional appearance of vedio data real-time adjustment three-dimensional geometry body
State.Adjust the state of whole threedimensional model in real time according to face location.
It is further that the process of the 3 d pose of real-time adjustment threedimensional model includes step：By the 3 d pose number
According to generation transformation matrix；Transformation matrix and each summit of threedimensional model are entered into line translation, the final form of threedimensional model is obtained；Such as
Fruit threedimensional model has an animation, the final form of threedimensional model in conjunction with Skeletal Skinned Animation, obtain carrying after real-time adjustment
The final scene of threedimensional model.
On the other hand, present invention also offers a kind of three-dimensional camera system based on OpenGL ES, including mutually communication connects
The mobile device and Modeling Calculation machine for connecing, the mobile device include camera, memory, graphic process unit, central processing unit
Equipped with display, the camera, memory, graphic process unit and display equipment are respectively connecting to central processing unit.
Using the beneficial effect of the technical program：
Can be combined with each other for personage in live or later stage video and virtual three-dimensional body by the present invention, make personage and three
Dimension object together appearance, and there is amalgamation higher each other, increased the interest taken pictures；Being capable of location tracking in real time
Image in video, and tracking accuracy is high, fast response time；And method proposed by the present invention calculates fast response time, renders effect
Rate is high.
Brief description of the drawings
Fig. 1 is a kind of three-dimensional photographic method schematic flow sheet based on OpenGL ES of the invention；
Fig. 2 is a kind of structural representation of the three-dimensional camera system based on OpenGL ES in the embodiment of the present invention.
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made into one below in conjunction with the accompanying drawings
Step is illustrated.
In the present embodiment, shown in Figure 1, the present invention proposes a kind of three-dimensional photographic method based on OpenGL ES,
Including step S01-S06.
Wherein：
S01, builds three-dimensional model geometric body, and three-dimensional model geometric body is stored in into depositing for mobile device using modeling software
In reservoir.
Modeling software described in step S01 is Maya modeling softwares, and the software is the 3 d modeling software of market main flow, is led to
It is strong with performance；In the modeling process of step S01, texture mapping is added to the three-dimensional model geometric body, if there is animation to add bone
Bone Skinned Animation, makes three-dimensional model geometric body more lifelike image.
A three-dimensional model geometric body is created using 3 d modeling software, can be textured with animation, selection is corresponding
Dimension scale, is rendered by corresponding size in a program to facilitate；After model is made, FBX is exported as
Or the general three-dimensional DIF such as DAE.
Here the implementation process for illustrating concrete model, using main flow 3 d modeling software on the market, such as
Threedimensional model is made used here as Maya, Maya is first turned on and is created new plane, three-dimensional modeling personnel create summit here
Data obtain carrying out the mapping of UV texture coordinates again correctly to show after sticking texture maps to model again after a model
Texture, the data required for finally being derived using plug-in unit, comprising single texture image.
S02, video image is obtained using the camera of mobile device, and by recognition of face and method for tracing locating human face
Position, obtains vedio data.
Recognition of face is with method for tracing process in step S02, analyze camera video image data, recognize face and with
Track face, obtains on human face data, and the human face data includes the three-dimensional of eye position data, face position data and face
Attitude data；Video image and human face data are combined into view data.
The recognition of face carried using mobile device carries out face with tracking or other third party face tracking systems
Identification and positioning, obtain the human face datas such as coordinate position, 3D attitude of the face in whole output picture, be follow-up three-dimensional
Model synthesis is prepared.
Here illustrated with iPhone mobile phones, first by the Face datection API that system is provided, obtain people
Position and size where face, one or more face positional information angle in the picture can be returned to according to actual conditions system
The information such as degree, system would generally return to face rectangular area shared in the picture to identify；Again these with face correlation
Data are tracked in taking face tracking system, by corresponding algorithm from tens of thousands of train come human face data model in
66 or more tracking points are obtained, to obtain the real-time tracing effect of face location, while the 3D of face can be evaluated
Attitude, such as face yaw, roll and pitch angle informations.
S03, three-dimensional model geometric body is parsed by the central processing unit of mobile device, obtains parsing data；.
Data are parsed described in step S03 includes vertex data, index data, texture coordinate and bone animation data covering
Weights, are that OpenGL ES render offer basic data.
Here illustratively idiographic flow is carried out by taking DAE forms as an example, DAE forms are the XML formats of standard, and its standard is current
It is to be safeguarded by khronos, because being to include vertex data node, animation data node, texture inside the XML format of standard
Coordinate node, index data node and bone animation data node etc. need all data for rendering, it is only necessary to program writing with
On all data for being previously mentioned parse, just can use these data.
S04, OpenGL ES are utilized and are parsed data drawing three-dimensional model.
OpenGL ES skill three-dimensional geometry bodies, including step are used in step S04：
Interface is uploaded using the vertex data of OpenGL ES to upload in graphic process unit with to be rendered vertex data；
Vertex data is taken first, and vertex data is an external morphology data for threedimensional model, uses the number of vertex of OpenGL ES
Uploaded to be rendered on GPU, in order to performance can also use VAO, VBO etc. directly to store the data in GPU according to interface is uploaded
On, because what is used renders mode difference, simultaneously because the data volume of threedimensional model is generally huger, so also to use rope
That draws mode renders mode, so also needing to index data to be uploaded to GPU.
Index data is uploaded to graphic process unit, corresponding vertex data is found in vertex data according to index data
To be organized into corresponding threedimensional model；Because the data volume of threedimensional model is generally huger, this step is mainly used in saving number
According to amount, accelerate rendering speed；It is corresponding to be organized into that index data can find corresponding vertex data in vertex data
Threedimensional model, mainly saves data volume；After having vertex data and index data, have been able to render three in theory
Dimension module, simply the outward appearance of this when of threedimensional model may be less good-looking, because not adding illumination, without addition line
Reason, while not adding animation.
Texture coordinate and texture image are uploaded to graphic process unit, and use texture coordinate map texture image, obtained
The threedimensional model of textured image；This step causes the more life-like of threedimensional model.
If threedimensional model carries animation, by Skeletal Skinned Animation data real-time update vertex data, more than circulation walk
Suddenly the threedimensional model with animation is obtained；This step causes the more life-like of threedimensional model, real-time update threedimensional model.For three-dimensional
Model modification is true to nature, in addition it is also necessary to upload data texturing and texture coordinate, when also needing to if needed real renewal vertex data with
Just animation is obtained, it is Skeletal Skinned Animation data that vertex data source is updated here, in order to simplicity temporarily runs fortune on GPU
Calculate, GPU is directly committed to after operation result is obtained.
Specifically, data texturing needs, when DAE or FBX is derived, together to derive texture picture, this texture picture is used
, to the function of model addition " skin ", to make it appear to more life-like；First texture picture data read-out and generation one
Texture in correspondence Opengl ES, that is, obtain TextureId；Then with generally write the mode of shader TextureId with
The consistent variables of uniform in shader are corresponding and assignment, and now GPU has had vertex data, index data and texture
Data, but also lack how the data on mapping texture data to model, i.e. texture coordinate data, because having parsed
The texture coordinate data of whole model, so likewise, this texure coordinate data parsed, and by OpenGL
ES uploads interface and data is uploaded to GPU accordingly, after this series of actions is completed, it is only necessary to call OpenGL ES phases
That answers renders interface, and is shown on GLView, just already allows to see that the threedimensional model of static state.
If there is animation in this threedimensional model, then also accordingly animation should be rendered, the principle of animation is
Vertex data is updated in real time, and the calculating that this part animation updates can be placed on GPU and can also be placed on CPU, the present embodiment
In be placed on CPU and to calculate.
Idiographic flow is, using the animation data, skeleton data and covering data for obtaining come the final summit of interpolation calculation
Data；Such as with the presence of animation on time the two time periods of T0 and T1, then the animation showed on the two time points
Data can show the presence of this conversion, and conversion typically exists in the way of transformation matrix, centre linear interpolation or four
First number spherical linear interpolation is completed, bone by being multiplied with skeleton data after obtaining corresponding time point corresponding transformation matrix
Bone modality conversion on this time of T1 because threedimensional model generally has multiple nodes, such as father node and child node, in order to allow son
Node is converted with the conversion of father node, so also needing to cascade the matrix of multiplication child node itself, is obtaining each node
After corresponding to the transformation matrix of world coordinates, in addition it is also necessary to understand that bone, joint are in fact things present in imagination, its essence is
One local coordinate system.Because all conversion of final vertex are all driven by bone, also need to a summit and sat from the world
Mark system transforms to the local coordinate system of bone presence, and the influential summit of institute just can be driven so when skeleton motion together
Motion.Here each bone contains the data for being called excursion matrix, it is only necessary to which this excursion matrix is multiplied by summit
Just this can be converted, the summit for being formed here can realize animation effect, but due to being " hard " conversion, institute
" crack " can be produced with the conversion between joint, so also needing to introduce covering effect, covering is authority, and each summit may
Influenceed by multiple bones, total weight value is 1, then a summit is influenceed by multiple bones, then so realization in joint
Effect is smooth, that is, disappear in " crack ", then whole structure just can out, so realize some as blinked,
Shut up the functions such as bar, threedimensional model is followed the FA Facial Animation of people and animation.
S05, is mixed vedio data and threedimensional model using OpenGL ES mixed modes, and final rendering
Go out the final scene with threedimensional model.
Vedio data is mixed with three-dimensional geometry body according to OpenGL ES mixing in step S05, including step
Suddenly：OpenGL ES mixed modes are set and depth test is opened, with a layer pattern render video view data, this figure layer is
The picture element unit being made up of 4 vertex datas and 4 texture coordinates；Reuse the three-dimensional modeling data renders three-dimensional after parsing
Model；Threedimensional model with multiple networks composition, renders respectively to each network；Then Alpha hybrid modes are used
Render and obtain the final scene with threedimensional model.
Set mixed mode and open the preparation such as depth test, be come the video data that render video is input into a layer pattern
Whole image data, all are already equipped with ready, the not renders three-dimensional when the whole video image that camera is given is rendered
Model；When video image renders completion, then carry out renders three-dimensional and render, be made up of simultaneously multiple grids because threedimensional model is likely to be
And each summit depth is different, so have to open depth test here, it is noted here that in render video image and wash with watercolours
Whether the writeable problem in depth buffer is in order to avoid effect out is incorrect during dye threedimensional model.It is used in mixed way based on Alpha's
Render mode just can easily realize the effect for needing.
S06, user is showed by final scene by the display device of mobile device.
As the prioritization scheme of above-described embodiment, step is also included after S06：It is three-dimensional according to vedio data real-time adjustment
The 3 d pose of solid.Adjust the state of whole threedimensional model in real time according to face location..
The process of the 3 d pose of real-time adjustment threedimensional model includes step：The 3 d pose data genaration is converted into square
Battle array；Transformation matrix and each summit of threedimensional model are entered into line translation, the final form of threedimensional model is obtained；If threedimensional model has
Animation, the final form of threedimensional model in conjunction with Skeletal Skinned Animation, obtain after real-time adjustment with threedimensional model most
End scape.
Specifically, adjusting the state of whole threedimensional model, method in real time using the face location data obtained in S02
It is when the final vertex position datas of GPU are submitted to plus the 3 d pose data of previous step face, that is, adds a Matrix Multiplication
Method, the model-view transform matrixes projection matrix application that face 3 d pose is obtained up, i.e., the number of vertex of threedimensional model
It is multiplied according to the final conversion with 3 d pose in vertex shader, final matrix here can be in CPU ends model view
Matrix is represented with the multiplied result of projection matrix.
It is noted here that keeping data type (column vector or row vector) consistent, i.e., matrix premultiplication or the right side multiply；So
The final matrix data that will be obtained, in conjunction with have also been employed that the vertex data of upper animation effect so as to by with final matrix phase
Multiply and calculate final vertex position, have a details here it should be noted that threedimensional model have can be by multiple group of networks
Into, there is excursion matrix between them, set membership is there is typically further, so being also required to the final matrix of each network to pass through
The mode of cascade calculates treatment, finally multiplied by the modelview matrix projection matrix being initially referred to, is just finally included
The effect of threedimensional model.
The dynamic rendering layer of 2D can also be added on the basis of three-dimensional simultaneously, just content can so more enriched.
To coordinate the realization of the inventive method, based on identical inventive concept, as shown in Fig. 2 present invention also offers one
Plant the three-dimensional camera system based on OpenGL ES, including the mutually mobile device and Modeling Calculation machine of communication connection, the movement
Equipment includes camera, memory, graphic process unit, central processing unit and display equipment, the camera, memory, figure
Processor and display equipment are respectively connecting to central processing unit.
General principle of the invention and principal character and advantages of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not limited to the above embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (9)
1. a kind of three-dimensional photographic method based on OpenGL ES, it is characterised in that including step,
S01, builds three-dimensional model geometric body, and three-dimensional model geometric body is stored in the memory of mobile device using modeling software
In；
S02, video image is obtained using the camera of mobile device, and by recognition of face and method for tracing locating human face position
Put, obtain vedio data；
S03, three-dimensional model geometric body is parsed by the central processing unit of mobile device, obtains parsing data；
S04, OpenGL ES are utilized and are parsed data drawing three-dimensional model；
S05, is mixed vedio data and threedimensional model using OpenGL ES mixed modes, and final rendering goes out band
There is the final scene of threedimensional model；
S06, user is showed by final scene by the display device of mobile device.
2. a kind of three-dimensional photographic method based on OpenGL ES according to claim 1, it is characterised in that step S01's
In modeling process, texture mapping is added to the three-dimensional model geometric body.
3. a kind of three-dimensional photographic method based on OpenGL ES according to claim 2, it is characterised in that in step S02
Recognition of face is to analyze camera video image data, identification face and track human faces with method for tracing process, is obtained on people
Face data, the human face data includes the 3 d pose data of eye position data, face position data and face；Video image
View data is combined into human face data.
4. a kind of three-dimensional photographic method based on OpenGL ES according to claim 3, it is characterised in that in step S03
The parsing data include vertex data, index data, texture coordinate and bone animation data covering weights.
5. a kind of three-dimensional photographic method based on OpenGL ES according to claim 4, it is characterised in that in step S04
With OpenGL ES drawing three-dimensional solids, including step：
Interface is uploaded using the vertex data of OpenGL ES to upload in graphic process unit with to be rendered vertex data；
Index data is uploaded to graphic process unit, corresponding vertex data is found come group in vertex data according to index data
It is made into corresponding threedimensional model；
Texture coordinate is uploaded to graphic process unit, and uses texture coordinate map texture image, obtain the three of textured image
Dimension module；
If threedimensional model carries animation, by Skeletal Skinned Animation data real-time update vertex data, circulation above step is obtained
To the threedimensional model with animation.
6. a kind of three-dimensional photographic method based on OpenGL ES according to claim 5, it is characterised in that in step S05
Vedio data is mixed with three-dimensional geometry body according to OpenGL ES mixing, including step：OpenGL ES are set to mix
Syntype simultaneously opens depth test, and with a layer pattern render video view data, this figure layer is by 4 vertex datas and 4
The picture element unit of texture coordinate composition；Reuse the three-dimensional modeling data renders three-dimensional model after parsing；With multiple networks
The threedimensional model of composition, renders respectively to each network；Then rendered using Alpha hybrid modes and obtained with three-dimensional mould
The final scene of type.
7. a kind of three-dimensional photographic method based on OpenGL ES according to claim 6, it is characterised in that also wrapped after S06
Include step：According to the 3 d pose of vedio data real-time adjustment three-dimensional geometry body.
8. a kind of three-dimensional photographic method based on OpenGL ES according to claim 7, it is characterised in that real-time adjustment
The process of the 3 d pose of threedimensional model includes step：By the 3 d pose data genaration transformation matrix；By transformation matrix and
Line translation is entered on each summit of threedimensional model, obtains the final form of threedimensional model；If threedimensional model has animation, threedimensional model
Final form in conjunction with Skeletal Skinned Animation, obtain the final scene with threedimensional model after real-time adjustment.
9. a kind of three-dimensional camera system based on OpenGL ES, it is characterised in that including the mutually mobile device of communication connection and
Modeling Calculation machine, the mobile device includes camera, memory, graphic process unit, central processing unit and display equipment, described
Camera, memory, graphic process unit and display equipment are respectively connecting to central processing unit.
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