CN116843819A - Green curtain infinite extension method based on illusion engine - Google Patents
Green curtain infinite extension method based on illusion engine Download PDFInfo
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Abstract
The application discloses a green curtain infinite extension method based on a illusion engine, which comprises the following steps: the camera input source is connected with the illusion engine, and green screen matting is carried out on the input source through a synthesis module of the illusion engine; programming to generate a cube grid, and constructing a virtual green curtain space according to a camera view angle; generating a plurality of single sections to form a virtual green cloth area under a virtual green curtain space; creating a scene capturing component, respectively rendering a virtual green curtain space and a virtual green cloth area, and outputting a corresponding scene capturing rendering texture map; and superposing the output scene capture rendering texture map and the input source picture, and cutting the input source picture according to the virtual green cloth area, so that the effect that the actual green curtain space can be extended in real time in the virtual scene according to the camera visual angle is achieved.
Description
Technical Field
The application relates to the fields of virtual production, virtual release meeting, virtual live broadcast and the like, in particular to a green curtain infinite extension method based on a illusion engine.
Background
Under virtual live broadcast applications such as e-commerce, release meeting, the diversity and the differentiation of live broadcast mechanism and live broadcast platform are great, and many are because green interscreen space restriction, and green cloth scope is little, and the non-green cloth picture outside the green curtain scope that can not be shot in camera activity in-process leads to wearing group problem, has also reduced the range of motion of personage in the virtual live broadcast to distance and shooting scene between camera and the live broadcast main part are different, influence live broadcast effect has been shortened. The problem that non-green cloth pictures outside the range of the green curtain are shot due to space limitation can be solved, the cost and budget can be greatly controlled, and the method becomes an important ring of urgent demands in the field of virtual live broadcasting.
Therefore, those skilled in the art are dedicated to develop a method for infinitely extending a green curtain based on a phantom Engine (UE 5 for short) to solve at least the problem that a non-green-curtain picture outside the green-curtain range is shot in the camera moving process due to a smaller green-curtain range under the limitation of a real green-curtain space in the related art, so that the live effect is not affected by the limitation, distance and scene between the camera and the live subject, and the cost and live budget are greatly saved without expanding the green-curtain space.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present application aims to solve the problem of lasting due to the fact that the scope of the green cloth is smaller under the limitation of the real space between the green curtains in the related art, and the non-green cloth pictures outside the scope of the green curtains are shot during the camera moving process.
In order to achieve the above purpose, the application provides a green curtain infinite extension method based on a illusion engine, which comprises the following steps:
step S1: the camera input source is connected with the illusion engine, and green screen matting is carried out on the input source through a synthesis module of the illusion engine;
step S2: programming to generate a cube grid, and constructing a virtual green curtain space according to the camera view angle;
step S3: generating a plurality of single sections to form a virtual green cloth area under the virtual green curtain space;
step S4: creating a scene capturing component, respectively rendering the virtual green curtain space and the virtual green cloth area, and outputting a corresponding scene capturing rendering texture map;
step S5: and superposing the output scene capturing rendering texture map and the input source picture, and cutting the input source picture according to the virtual green cloth area to realize real-time extension of the green curtain according to the visual angle.
Further, the step S1 further includes:
and the green curtain input source picture is connected into the illusion engine through the SDI or an external acquisition card, green curtain image matting is carried out on the input source through a synthesis module of the illusion engine, and the illusion engine material property of the image-matted input source picture is endowed to the image matting panel grid body and is placed in a virtual scene.
Further, the step S2 further includes:
constructing a cube grid with an initial size through a programming generation component, wherein the cube grid comprises a front wall, a ground, a left wall and a right wall; the camera is swung left and right, the width, height and depth of the programmed cube grid are continuously adjusted according to the green curtain range displayed in the input source picture, so that a virtual green curtain space corresponding to the size of the actual green curtain space is generated in the virtual scene, and meanwhile, the space relation of the virtual green curtain space can be clearly displayed through transparency adjustment.
Further, the step S3 further includes:
and multiplexing all vertex information, normal vectors, UV mapping coordinates and tangential direction information of the virtual green curtain space, continuing to program to generate a single section, and constructing four sections which are respectively front green cloth, ground green cloth, left wall green cloth and right wall green cloth.
Further, the four sections are attached to the virtual green curtain space as sub-objects as the virtual green cloth areas corresponding to the actual green cloth sizes; and continuously shaking the camera back and forth according to the actual green cloth range to adjust the sizes of the front green cloth, the ground green cloth, the left wall green cloth and the right wall green cloth, updating the sections in real time, and filling the four sections of the virtual green cloth area with green corresponding to the actual green cloth.
Further, the method for adjusting the size of the green cloth by shaking the camera comprises the following steps:
swinging the physical camera leftwards, simultaneously adjusting the left edge range of the front green cloth to coincide with the left edge of the green cloth in the actual green curtain space, and if the left edge of the front green cloth exceeds the left range of the front wall, firstly adjusting the front wall and then continuously adjusting the left edge range of the front green cloth;
swinging the physical camera rightward, and simultaneously adjusting the right range of the front green cloth to coincide with the right edge of the green cloth in the actual green curtain space; likewise, if the left edge of the front green cloth exceeds the right range of the front wall, firstly adjusting the front wall and then continuously adjusting the right edge range of the front green cloth;
and similarly, determining the spatial relationship among the final ground green cloth, the left wall green cloth and the right wall green cloth according to the depths of the left wall green cloth, the right wall green cloth and the ground green cloth in the actual green curtain space.
Further, the step S4 further includes:
after the virtual green curtain space and the virtual green cloth area corresponding to the display green curtain space are constructed in the virtual scene, 2 scene capturing components based on the illusion engine are then created to respectively render the corresponding virtual green curtain space and virtual green cloth area, and the scene capturing rendering texture map of the virtual green cloth area are input in real time.
Further, the step S5 further includes:
and superposing the two scene capturing rendering texture maps output in real time and the input source pictures subjected to the image matting processing, wherein the superposition relation is that the input source pictures are superposed with the front green cloth areas, and then the virtual green cloth areas are superposed with the virtual green curtain space.
Further, the step S5 further includes:
based on the virtual green cloth area range constructed in the virtual scene, the input source picture subjected to image matting processing is cut in real time according to the virtual green cloth area, namely, only the part of the input source picture in the area of the virtual green cloth area is reserved, and the rest part is cut.
Further, the normal vector, the UV map coordinates and the tangential direction are all corresponding to vertices, triangular surfaces are all surfaces of the model, the triangular surfaces are connected by using array subscripts of the vertices, and each triangular surface can be connected clockwise and anticlockwise.
The application solves the problem of lasting caused by the fact that the space between the real green curtains is limited, the scope of the green cloth is smaller, and the non-green cloth pictures outside the scope of the green curtains cannot be shot in the swinging process of the camera, and the non-green cloth pictures outside the scope can be cut into virtual scenes in real time according to the visual angle by infinitely extending the green curtains in the virtual scenes, so that the narrow green cloth pictures and the virtual scenes can be connected seamlessly.
The conception, specific structure, and technical effects of the present application will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present application.
Drawings
FIG. 1 is a schematic illustration of a phantom engine based green curtain extension linear flow diagram in accordance with a preferred embodiment of the present application;
FIG. 2 is a diagram of the spatial relationship of building a virtual green curtain in accordance with a preferred embodiment of the present application;
FIG. 3 is a schematic triangular view of a preferred embodiment of the present application;
FIG. 4 is a diagram of a relationship between building virtual green cloth areas in accordance with a preferred embodiment of the present application;
FIG. 5 is a diagram showing an example of overlapping of virtual green curtain space and green layout area in accordance with a preferred embodiment of the present application.
Detailed Description
The following description of the preferred embodiments of the present application refers to the accompanying drawings, which make the technical contents thereof more clear and easy to understand. The present application may be embodied in many different forms of embodiments and the scope of the present application is not limited to only the embodiments described herein.
In the drawings, like structural elements are referred to by like reference numerals and components having similar structure or function are referred to by like reference numerals. The dimensions and thickness of each component shown in the drawings are arbitrarily shown, and the present application is not limited to the dimensions and thickness of each component. The thickness of the components is exaggerated in some places in the drawings for clarity of illustration.
As shown in fig. 1, the application relates to a green curtain infinite extension method based on a illusion engine un realness engine, which relates to application fields of virtual manufacture, virtual release meeting, virtual live broadcast and the like, and the method comprises the following steps: the method comprises the steps that a green screen input source picture is accessed to an illusion engine (UE 5), and green screen image matting is carried out on the input source through a UE5 synthesis module (UnrealComposite); generating a virtual space corresponding to the size of the actual green curtain space in the virtual scene through a ProducalMesh (ProducalMesh) generated by programming, and naming the virtual space as a virtual green curtain space (GreenRoomBox), and supporting transparency adjustment to display a space relation more clearly; the physical camera view angle is swung, and the width, height and depth of a virtual green curtain space (GreenRoomBox) are adjusted according to the actual green curtain space range. And multiplexing all vertex information Vertics, normal vector Normal, UV map coordinates, tangential direction Tangent and other information based on the generated virtual Green curtain space (Green RoomBox), continuing programming to generate a single section (ProducalMeshSection), constructing four section areas of front, ground, left wall Green cloth and right wall Green cloth into sub-objects, adding the sub-objects to the virtual Green curtain space (GreenRoom Box) as a virtual Green cloth range corresponding to the actual Green cloth size in the Green curtain space, and naming the virtual Green cloth area (GreenArea). And continuously shaking the camera to adjust the section size and updating a UE5 section grid component (MeshSection) in real time according to the actual green cloth range. And then, respectively rendering only a virtual green curtain space (GreenRoomBox) and a virtual green cloth area (GreenRoomBox) by creating two UE5 scene capturing components (SceneCapture), outputting a scene capturing rendering texture map (RenderTarget) of the virtual green curtain space (GreenRoomBox) and a scene capturing rendering texture map (RenderTarget) of the virtual green cloth area (GreenArea), superposing the scene capturing rendering texture map (RenderTarget) and an input source picture, and cutting the input source picture in real time through the virtual green cloth area (GreenArea), so that the effect that the actual green curtain space infinitely extends in the virtual scene according to the camera view angle is finally achieved.
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The embodiment provides a green curtain infinite extension method based on a illusion engine Unrealkine, which comprises the following detailed implementation processes:
the method comprises the steps that a green screen input source picture is accessed to a Unreal engine through a BMD acquisition card interface (SDI) or an external acquisition card, green screen image matting is carried out on an input source through a UE5 synthesis module (Unrealkomplex), and Material assets (materials) of the input source picture UE5 subjected to image matting processing are endowed to a default position on a surface mesh plane (PlanMesh) of an image matting surface piece UE and are placed in a virtual scene;
a programmable generating unit (ProceduralMeshBox) of an initial size (300 x 300 cm) is constructed by a programmable generating UE5, and the initial position of the Box is based on the position of the input source picture PlaneMesh in the scene, and the Box comprises four parts of a front wall, a ground, a left wall and a right wall.
Swinging the visual angle of the physical camera leftwards, and simultaneously adjusting the left area of the front wall to coincide with the left wall edge in the actual green curtain space; swinging the visual angle of the physical camera rightward, and simultaneously adjusting the size of the right area of the front wall to coincide with the edge of the right wall in the actual green curtain space; and continuing to swing the pitching angle of the physical camera, and adjusting the size of the ground depth area and the area range corresponding to the left wall and the right wall.
As shown in fig. 2, by adjusting, a virtual green curtain space (greenroomex) corresponding to the size of the actual green curtain space is constructed in the virtual scene, and at the same time, transparency adjustment of the virtual green curtain space (greenroomex) needs to be supported to display the spatial relationship more clearly;
based on a programmed cube grid (ProducalMeshBox), multiplexing all vertex information of a virtual Green curtain space (Green RoomBox), normal vectors, UV mapping coordinates, tangential direction and other information, continuously programming to generate a single section (ProducalMeshsection), and constructing four sections serving as actual Green cloth area ranges in the Green curtain space, namely a front Green cloth area, a ground Green cloth area, a left wall Green cloth area and a right wall Green cloth area;
the normal vector, the UV map coordinates and the tangential direction are all corresponding to the vertexes, trianges are all surfaces of the model, for example, each cross Section rectangular plane is provided with four vertexes, two triangular surfaces are connected by the four vertexes, a Section can be normally displayed, trianges are connected by using array subscript of the vertexes, each triangular surface can be connected clockwise and anticlockwise, and the difference is the orientation of the surfaces.
As shown in fig. 3, in this embodiment, according to the cross-sectional orientation, all triangular faces (trianges) of the model are 0, 2, and 1; 0. 3, 1 Array; if three array subscripts are used to connect a triangle, the two triangles are 021 and 123, respectively.
As shown in fig. 4, four sections based on the construction are attached as sub-objects to a virtual green curtain space (GreenRoom Box) as a virtual green cloth area (GreenArea) corresponding to the actual green cloth size. Swinging the physical camera leftwards, simultaneously adjusting the left range of the front green cloth to coincide with the left edge of the green cloth in the actual green curtain space, and if the left edge of the front green cloth exceeds the left range of the front wall, firstly adjusting the front wall and then continuously adjusting the left edge area of the front green cloth;
swinging the physical camera angle to the right, and simultaneously adjusting the right range of the front green cloth to coincide with the right edge of the green cloth in the actual green curtain space; likewise, if the right edge of the front green cloth exceeds the right range of the front wall, firstly adjusting the front wall and then continuously adjusting the right edge area of the front green cloth;
similarly, the space relation among the final ground green cloth, the left wall green cloth and the right wall green cloth is determined continuously according to the depths of the left wall green cloth, the right wall green cloth and the ground green cloth in the actual green curtain space;
the size of the front green cloth area, the size of the ground green cloth area, the size of the left wall green cloth area and the size of the right wall green cloth area are adjusted, the mesh component (Meshsection) of the UE5 is updated in real time, and the four sections of the virtual green cloth area (GreenAreaBox) are filled to be green and correspond to the actual green cloth. Wherein, each green cloth area range can not exceed the virtual green curtain space (GreenRoomBox) green curtain space range;
after constructing a virtual Green curtain space (GreenRoombox) and a virtual Green cloth Area (GreenArea) corresponding to the display Green curtain space in the virtual Scene, then creating a UE5 Scene capturing component (SceneCapture) and a virtual Green cloth Area (GreenRoombox) UE5 Scene capturing component (SceneCapture) of the virtual Green curtain space (GreenRoombox) respectively only render the corresponding virtual Green curtain space (GreenRoombox) and virtual Green cloth Area (Green Area), and inputting a corresponding Scene capturing rendering texture map (RenderTarget) in real time;
as shown in fig. 5, a virtual green curtain space (greenroomex) scene capture rendering texture map (RenderTarget) and a virtual green area (GreenArea) scene capture rendering texture map (RenderTarget) output in real time are performed with an input source picture subjected to matting processing. The superposition relation is that the input source picture is superposed with the front green cloth area, and then the virtual green cloth area (GreenArea) is superposed with the virtual green curtain space (GreenRoomBox); the input source picture is positioned in the virtual green cloth area (GreenArea) area, and the virtual green cloth area (GreenArea) is positioned in the virtual green curtain space (GreenRoomBox) area;
based on a virtual green cloth area (GreenArea) constructed in the virtual scene, the input source picture subjected to image matting processing is cut in real time according to the virtual green cloth area (GreenArea), namely, only the part of the input source picture in the virtual green cloth area (GreenArea) is reserved, and the rest part is cut, so that the effect that the actual green screen space can be extended in real time in the virtual scene according to the visual angle of a camera is finally achieved.
The foregoing describes in detail preferred embodiments of the present application. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the application without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The green curtain infinite extension method based on the illusion engine is characterized by comprising the following steps:
step S1: the camera input source is connected with the illusion engine, and green screen matting is carried out on the input source through a synthesis module of the illusion engine;
step S2: programming to generate a cube grid, and constructing a virtual green curtain space according to the camera view angle;
step S3: generating a plurality of single sections to form a virtual green cloth area under the virtual green curtain space;
step S4: creating a scene capturing component, respectively rendering the virtual green curtain space and the virtual green cloth area, and outputting a corresponding scene capturing rendering texture map;
step S5: and superposing the output scene capturing rendering texture map and the input source picture, and cutting the input source picture according to the virtual green cloth area to realize real-time extension of the green curtain according to the visual angle.
2. The illusion engine-based green curtain infinite extension method according to claim 1 wherein the step S1 further comprises:
and the green curtain input source picture is connected into the illusion engine through the SDI or an external acquisition card, green curtain image matting is carried out on the input source through a synthesis module of the illusion engine, and the illusion engine material property of the image-matted input source picture is endowed to the image matting panel grid body and is placed in a virtual scene.
3. The illusion engine-based green curtain infinite extension method according to claim 1 wherein the step S2 further comprises:
constructing a cube grid with an initial size through a programming generation component, wherein the cube grid comprises a front wall, a ground, a left wall and a right wall; the camera is swung left and right, the width, height and depth of the programmed cube grid are continuously adjusted according to the green curtain range displayed in the input source picture, so that a virtual green curtain space corresponding to the size of the actual green curtain space is generated in the virtual scene, and meanwhile, the space relation of the virtual green curtain space can be clearly displayed through transparency adjustment.
4. The illusion engine-based green curtain infinite extension method according to claim 1 wherein the step S3 further comprises:
and multiplexing all vertex information, normal vectors, UV mapping coordinates and tangential direction information of the virtual green curtain space, continuing to program to generate a single section, and constructing four sections which are respectively front green cloth, ground green cloth, left wall green cloth and right wall green cloth.
5. The illusion engine based green curtain infinite extension method according to claim 4 wherein the four sections are attached as sub-objects to the virtual green curtain space as the virtual green cloth area corresponding to an actual green cloth size; and continuously shaking the camera back and forth according to the actual green cloth range to adjust the sizes of the front green cloth, the ground green cloth, the left wall green cloth and the right wall green cloth, updating the sections in real time, and filling the four sections of the virtual green cloth area with green corresponding to the actual green cloth.
6. The illusion engine-based green curtain infinite extension method according to claim 5 wherein the method of adjusting the size of the green cloth by panning the camera is:
swinging the physical camera leftwards, simultaneously adjusting the left edge range of the front green cloth to coincide with the left edge of the green cloth in the actual green curtain space, and if the left edge of the front green cloth exceeds the left range of the front wall, firstly adjusting the front wall and then continuously adjusting the left edge range of the front green cloth;
swinging the physical camera rightward, and simultaneously adjusting the right range of the front green cloth to coincide with the right edge of the green cloth in the actual green curtain space; likewise, if the left edge of the front green cloth exceeds the right range of the front wall, firstly adjusting the front wall and then continuously adjusting the right edge range of the front green cloth;
and similarly, determining the spatial relationship among the final ground green cloth, the left wall green cloth and the right wall green cloth according to the depths of the left wall green cloth, the right wall green cloth and the ground green cloth in the actual green curtain space.
7. The illusion engine-based green curtain infinite extension method according to claim 1, wherein the step S4 further includes:
after the virtual green curtain space and the virtual green cloth area corresponding to the display green curtain space are constructed in the virtual scene, 2 scene capturing components based on the illusion engine are then created to respectively render the corresponding virtual green curtain space and virtual green cloth area, and the scene capturing rendering texture map of the virtual green cloth area are input in real time.
8. The illusion engine-based green curtain infinite extension method according to claim 1 wherein step S5 further comprises:
and superposing the two scene capturing rendering texture maps output in real time and the input source pictures subjected to the image matting processing, wherein the superposition relation is that the input source pictures are superposed with the front green cloth areas, and then the virtual green cloth areas are superposed with the virtual green curtain space.
9. The illusion engine-based green curtain infinite extension method according to claim 1 wherein step S5 further comprises:
based on the virtual green cloth area range constructed in the virtual scene, the input source picture subjected to image matting processing is cut in real time according to the virtual green cloth area, namely, only the part of the input source picture in the area of the virtual green cloth area is reserved, and the rest part is cut.
10. The illusion engine-based green curtain infinite extension method according to claim 4 wherein the normal vector, the UV map coordinates and the tangential direction are all faces of a model, triangular faces are all faces of the model, the triangular faces are connected by array subscripts of the vertices, each triangular face can be connected clockwise and anticlockwise.
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