KR20240020235A - Activity video providing system based on virtual stage experience - Google Patents

Abstract

A system for providing activity images based on a virtual stage experience according to the present invention includes a chroma key zone where a chroma key screen is installed; a camera provided on one side of the chroma key zone, which generates a chroma key image of a performer with the chroma key screen in the background; A background database storing a plurality of background images, a background removal module for removing the background from the chroma key image received from the camera, and a composite image by combining one of the background images with the chroma key image from which the background has been removed. It is characterized in that it includes a main server including a background synthesis module that generates.
According to the virtual stage experience-based activity video provision system of the present invention, performers, who may be infants or children, can perform various activities in a virtual background video, thereby creating a virtual stage experience and further combining it with a fairy tale background to create a fairy tale. It has the effect of enabling infants and children to experience a variety of media by enabling the experience of becoming the main character in the story.

Description

Activity video providing system based on virtual stage experience}

The present invention relates to a system for providing activity images based on a virtual stage experience. To be described in more detail, various virtual background images are synthesized with chroma key images taken in a chroma key zone, and various activities are performed against the background of a virtual stage. It is about an activity video provision system that allows.

Since the emergence of black-and-white televisions in the 1960s, broadcasting technology in the television field has continued to develop remarkably along with developments in the field of electronic communication technology. In the 1980s, the introduction of color TV brought about groundbreaking changes in society as a whole, and the broadcasting of High Definition TeleVision (hereinafter simply referred to as 'HDTV'), which began in the late 1990s, opened another broadcasting era.

In recent high-definition television broadcasting, the development of technology for combining graphics and real-time video has led to the broadcasting of real-time composite video so sophisticated that it is impossible to distinguish between real-time video and virtual graphic video.

Representative examples of real-time composite video include virtual studio, virtual character, and virtual imaging technologies, and among these, virtual studio technology is steadily gaining attention.

This virtual studio technology uses the Chroma Key technique, a special effect that electrically synthesizes screens using color differences. For example, a representative example is combining cloud images or graphic screens in the background of a weather announcer, such as a weather forecast.

As a prior art for screen composition using this chroma key technique, ‘Virtual classroom lecture method and device’ is disclosed in Korean Patent No. 10-1270780.

The above prior art uses techniques such as chroma key or TOF to synthesize presentation content from various inputs (camera, laptop, video) into a virtual classroom, and output the instructor and presentation content in various screen configurations on one screen with a beautiful background studio screen. It is about a teaching method, and more specifically, (1) virtual classroom editing, which provides multiple 3D background layers, edits and designs them, places the instructor and presentation in this virtual classroom, and designs it to be displayed on various screens. and a step of saving, (2) taking a video of the instructor's lecture using a single or multiple cameras, (3) using a chroma key technique, etc. in the captured video of the lecture, and then layering only the instructor portion. (4) synthesizing the lecture material layer and the instructor layer displaying at least one lecture material on the virtual classroom graphic background layer to generate a final image and output it to a display device, (5) the instructor When writing using a tablet, the written content is added to the final image as a writing layer and output to the display device; (6) conversion of these scenes to display on the input presentation screen, laptop screen, video, external (7) When the instructor manually operates the screen configuration conversion device with an automatic or mouse-controlled switching or automatic presentation device that allows cameras, etc. to be freely selected and changed with a mouse, the lecture material layer, the instructor layer , converting the size, position, or angle of the writing layer, recombining it, and outputting it to the display device, wherein the size, position, or angle of the lecture material layer and the writing layer are converted at the same rate. It is a characteristic of its composition that it does so.

This prior art is characterized by increasing concentration on the lecture by having the instructor conduct the lecture in a virtual classroom.

Furthermore, the present invention uses a chromakey technique to allow performers to experience various stages, and in particular, a novel and advanced technology that allows performers, who may be infants or children, to experience various media on a virtual stage. There is a need to develop an activity video provision system based on virtual stage experience.

Korean Patent No. 10-1270780

The main purpose of the present invention is to enable various media experiences through the creation of composite images using the chroma key technique.

Another purpose of the present invention is to add a lighting configuration for producing clearer chroma key images.

Another purpose of the present invention is to further increase the clarity of the image through coating of the chroma key screen.

In order to achieve the above object, a system for providing activity images based on a virtual stage experience according to the present invention includes a chroma key zone where a chroma key screen is installed; a camera provided on one side of the chroma key zone, which generates a chroma key image of a performer with the chroma key screen in the background; A background database storing a plurality of background images, a background removal module for removing the background from the chroma key image received from the camera, and a composite image by combining one of the background images with the chroma key image from which the background has been removed. It is characterized in that it includes a main server including a background synthesis module that generates.

Furthermore, the system is provided on one side of the chroma key zone, and includes a main light that irradiates illumination light to the performer from in front of the performer, and a first sub light that irradiates illumination light to the performer from above the performer. and a lighting assembly including second and third sub-lights arranged symmetrically around the first sub-light and irradiating illumination light to the performer from both sides of the performer.

In addition, the surface of the chroma key screen is characterized by being coated with a diffuse reflection enhancer containing porous silica and polyethylmethacrylate.

According to the virtual stage experience-based activity video providing system of the present invention,

1) By allowing performers, who may be infants or children, to perform various activities in a virtual background video, it is possible to experience a virtual stage and, furthermore, to experience being the main character in a fairy tale by combining it with a fairy tale background. Enables a variety of media experiences,

2) In addition to the multi-angle lighting provision configuration of the lighting assembly, the differential illumination control configuration of the lighting assembly prevents only certain body parts of the performer from being excessively highlighted and provides lighting from multiple angles, resulting in more uniform clarity and contrast. You can shoot marquee images, and furthermore, this allows you to more precisely remove the background from chroma key images.

3) As the diffuse reflection enhancer is coated on the surface of the chroma key screen, clearer chroma key images can be captured by preventing loss of clarity and reduction in contrast that may occur as the illumination light irradiated on the performer is reflected from the chroma key screen.

1 is a conceptual diagram showing the schematic configuration of the system of the present invention.
Figure 2 is a photograph taken of the chroma key zone of the present invention.
Figure 3 is a block diagram showing the detailed configuration of the main server.
Figure 4 is a conceptual diagram showing an example of division of the performer area and background.
Figure 5 is a conceptual diagram showing an example of a generated composite image.
Figure 6 is a conceptual diagram showing an example of installation of a lighting assembly.
Figure 7 is a flowchart showing the steps of manufacturing the diffuse reflection enhancer of the present invention.
Figure 8 is a flowchart showing the steps for manufacturing the antifouling agent of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The accompanying drawings are not drawn to scale, and like reference numbers in each drawing refer to like elements.

Figure 1 is a conceptual diagram showing the schematic configuration of the system of the present invention, and Figure 2 is a photograph of the chroma key zone of the present invention.

1 and 2, the virtual stage experience-based activity video providing system of the present invention is characterized by including a chroma key zone 10, a camera 20, and a main server 30.

The chroma-key zone 10 refers to an area where the chroma-key screen 11 is installed. Here, the chroma-key screen 11 refers to a single-color background screen for chroma key, and is a conventional green or This means a blue background screen.

Therefore, any area where the chroma key screen 11 is installed can become the chroma key zone 10. Since the chroma key screen 11 can be installed anywhere, the area where the chroma key zone 10 is formed can be There are no restrictions whatsoever.

In other words, when the system administrator can move with the chroma key screen 11, the area where the chroma key screen 11 is installed becomes the chroma key zone 10.

A camera 20 is provided on one side of the chroma key zone 10. The camera 20 functions to generate a chroma key image by filming a performer taking an image against the background of the chroma key screen 11. .

Therefore, preferably, the camera 20 is installed in a direction facing the chroma key screen 11 and performs the function of generating a chroma key image of the performer with the chroma key screen 11 in the background.

In addition, in order to create a chroma key image of a performer located in the chroma key zone 10, a separate light may be installed on one side of the chroma key zone 10, and thus not only adjusts the brightness of the chroma key image through lighting, but also Of course, it is possible to obtain clearer chroma key images.

The main server 30 provides a function to remove the background from the chroma key image and create a composite image by combining the background image with the chroma key image from which the background has been removed. At this time, the generated composite video becomes an activity video, and preferably, the background video may represent a virtual stage. Therefore, a composite video in which the background video is combined with the background of the chroma key video, that is, the activity video, is as if the performer was on a virtual stage. It may be a video of an activity such as a performance.

Therefore, the entity that generates and provides the activity video may be the main server 30, and preferably, the main server 30 provides the activity video generated in this way to the performer's terminal such as a smartphone or PC owned by the performer. Of course it is possible.

This main server 30 is a series of entities for implementing the system of the present invention, and includes a server PC and a network communication network. In addition, the main server 30 is based on hardware equipped with a central processing unit (CPU) and storage means such as memory and hard disk, and a program that can be executed on the central processing unit, that is, software, is installed and can execute this software. A series of specific configurations for the software will be described later as structural units such as 'module', 'part', and 'part'.

These configurations such as 'module' or 'part' or 'interface' or 'part' are a configuration of hardware such as software or FPGA or ASIC that runs through CPU and memory while being installed and stored in the storage means of the main server. means. At this time, the meaning of 'module', 'unit', or 'interface' is not limited to hardware, and may be configured to reside in an addressable storage medium or to reproduce one or more processors.

As an example, 'module' or 'part' or 'interface' refers to components such as software components, object-oriented software components, class components and task components, processes, functions, and properties. Contains fields, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.

The functions provided by these 'modules' or 'parts' or 'interfaces' can be combined into smaller numbers of components and 'parts' or 'modules' or can be divided into additional components and 'parts' or 'modules'. Could be further separated.

In addition, the main server 30 refers to all types of hardware devices including at least one processor, and depending on the embodiment, it may be understood as encompassing software configurations operating on the hardware device. For example, a computing device as an example of a server may be understood as including, but is not limited to, a smartphone, tablet PC, desktop, laptop, and user clients and applications running on each device.

Hereinafter, based on this configuration, the virtual stage experience-based activity video providing system of the present invention will be described with drawings as follows.

Figure 3 is a block diagram showing the detailed configuration of the main server, Figure 4 is a conceptual diagram showing an example of the division of the performer area and the background, and Figure 5 is a conceptual diagram showing an example of a generated composite video.

3 and 5, the main server 30 of the present invention is characterized by including a background database 100, an area detection module 200, and a background synthesis module 300.

The background database 100 means storing a plurality of background images including any one of videos and images taken indoors or outdoors.

At this time, the background image is an image or video as described above, and includes an image captured at a specific location outdoors or indoors. Here, if the background video is shot outdoors, it can be shot by time, such as day, night, afternoon, evening, or morning, or by weather.

Therefore, images taken of various indoor or outdoor spaces can be saved as background images and used for background synthesis, which will be described later. Most preferably, the background video may be a photo or video of various performance stages.

The background removal module 200 performs a function of removing the background 52 from the chroma key image received from the camera 20 described above.

In the above explanation, the chroma key video is said to be a video in which the performer is filmed with the chroma key screen 11 in the background. Here, the representative object in the chromakey video is preferably the actor. In other words, the actor area 51, which is the body area of the actor, which is a representative object in the chroma key image, is detected, the background 52 excluding the actor area 51 is detected, and the background 52 is removed.

At this time, if the entire body of the performer is filmed in the chroma key video, the entire body becomes the performer's area 51, and if a part of the body is filmed, the part of the body becomes the performer's area. In other words, the performer's area 51 refers to the entire or part of the performer's body.

At this time, in order to detect the performer area 51 and the background 52, the outline of the person (performer area) captured in the video is detected, and the area within the closed curve formed by the outline is detected as the performer area 51, The area excluding the performer area 51 can be detected as the background 52. Since this can be done by applying a conventional method of detecting people in an image, a separate explanation will be omitted.

Furthermore, in the above explanation, the chroma key video is a video in which the performer is filmed with the chroma key screen 11 in the background. Therefore, when the actor area 51 and the background 52 are detected in the chroma key image, the detected background 52 can be easily removed.

This can be implemented using a conventional chroma-key technique. When a performer's area is detected in a chroma key image, the background (52) excluding the detected performer's area (51) is removed to create a blank space. This can be done for each frame, and ultimately, all of the background 52 can be removed from the chroma key image.

The background synthesis module 300 has a function of generating a composite image by combining any one of the background images stored in the background database 100 with the chroma key image from which the background 52 has been removed through the background removal module 200 described above. Perform.

The background image synthesized here may be a background image selected by the performer or the system administrator, and one of the background images stored in the background database 100 is selected by the performer or the system administrator and is used as a new background image in the chroma key image from which the background has been removed. Can be composited into the background.

This background synthesis is performed for each frame, so that the background image can be combined with the chroma key image with the background removed, that is, the performer area of the chroma key image and the background image can be synthesized.

Therefore, the composite image created through this can be said to be a composite of the background image and the chroma key image with the background 52 removed, that is, the performer area 51 included in the chroma key image. Preferably, the above-described background image is Since it can be said to be a virtual stage video, a composite video as if the performer is performing on a virtual stage can be created and provided to the performer's terminal owned by the performer.

The virtual stage experience-based activity image providing system of the present invention can generate a virtual activity image by combining the virtual background image and the performer area 51 of the chroma key image using a simultaneous synthesis technique through chroma key. Let it happen.

Therefore, it is desirable to allow performers, who may be infants or children, to perform various activities in a virtual background video, enabling a virtual stage experience, and even an experience of becoming the main character in a fairy tale by combining it with a fairy tale background. It has the effect of enabling children to experience a variety of media.

Additionally, the main server 30 described above may further include an effect application module 400 that allows visual effects to be added to the generated composite image.

The effect imparting module 400 performs the function of providing a visual effect by applying an image editing technique to the synthesized image. At this time, the visual effect refers to digitizing the image signal and processing it, such as enlarging/zooming out/rotating the screen and This can be brightness/contrast/saturation/color adjustment, section repetition, fade in/fade out, etc. When adding these visual effects, one effect can be applied to one composite image, but multiple effects can also be applied simultaneously. there is.

Furthermore, by adding a visual effect to the synthesized image, not only can the sense of immersion in the video be increased, but also the sense of heterogeneity between the synthesized background image and the performer area 51 can be minimized to create and provide a more natural composite image. It works.

Figure 6 is a conceptual diagram showing an example of installation of a lighting assembly.

In the above description, it is said that the system of the present invention may be provided with lighting on one side of the chroma key zone 10. In this case, the lighting may be provided as a single lighting, but preferably, a plurality of lights are used as one lighting assembly. It is desirable to form (40) to provide lighting to the performer from multiple angles and to capture clearer chroma key images.

6, the lighting assembly 40 may be provided on one side of the chroma key zone 10 and includes a main light 41 and first, second, and third sub lights 42, 43, and 44. It is characterized by including.

Here, the main light 41 is provided on one side in front of the performer and performs the function of irradiating illumination light to the performer. Preferably, the main light 41 is provided on one side of the camera 20 and has the function of radiating illumination light to the performer from the front. Perform.

Here, the front of the performer refers to the direction in which the performer faces the camera 20, and since the camera 20 is generally located in a direction facing the performer directly, the main light 42 also faces the performer directly. It is located near the camera 20 in the facing direction (forward) and performs the function of radiating illumination light directly to the performer.

In other words, when the performer is basically positioned in the direction facing forward (forward) in the chroma key zone 10, the performer looks directly at the main light 41 and the camera 20.

The first, second and third sub lights (42, 43 and 44) are arranged near the main light (41) and spaced apart from the main light (41). At this time, each of the first, second and third sub lights (42, 43) The location of ,44) is explained as follows.

Preferably, the first sub-light 42 is provided above the performer, that is, on one side above the performer's head, and radiates illumination light to the performer from above the performer. This first sub-light 42 may preferably be provided on one side of the ceiling of the chroma key zone 10.

Although the drawing shows an example in which two first sub-lights 10 are provided, the number of first sub-lights 42 may preferably be one or more. In this case, the center position of the first sub-lights 42 is each provided. 1 It becomes the center of the extension line connecting the centers of the sub lights 42.

The second and third sub-lights 43 and 44 are arranged symmetrically around the first sub-light 42 and serve to illuminate the performer from both sides of the performer. In the case of the first sub-light 42, illumination light is irradiated to the performer from above the performer's head, while the second and third sub-lights 43 and 44 are irradiated to the performer from the left and right sides of the performer, respectively.

If the light that radiates illumination light to the performer from the left side of the performer becomes the second sub-light 43, the light that irradiates illumination light to the performer from the right side of the performer becomes the third sub-light 11. The second and third sub lights 43 and 44 are arranged symmetrically around the first sub light 42, and may preferably be arranged symmetrically around the main light 41. That is, the first sub-light 42 and the main light 41 can all be arranged symmetrically around each other.

When such a lighting assembly 40 is provided, it can be used to illuminate the front of the performer (main light 41), above the performer (first sub-light 42), and to the left and right sides of the performer (second and third sub-lights 43, 44)), this can have the effect of irradiating the lighting evenly, preventing only certain body parts of the performer from being excessively highlighted, and providing lighting from complex angles, making it possible to shoot chroma key images with more uniform clarity and contrast. Furthermore, this has the advantage of being able to more precisely remove the background from the chroma key image.

Furthermore, the most main light in the lighting assembly 40 can be said to be the main light 41, which illuminates the performer from in front of the performer, and the first, second, and third sub lights 42, 43, and 44 are used as such. It can be said to be an auxiliary light that supports the main light (41).

Therefore, the illuminance of these auxiliary lights (1st, 2nd, and 3rd sub-lights 42, 43, 44) may vary depending on the illuminance of the main light 41, and further, each of the 1st, 2nd, and 3rd sub-lights 42 , 43, 44) and the main lighting 41, the illuminance of the first, 2, and 3 sub-lights 42, 43, 44 can be adjusted. For this, the main server 30 controls the illuminance. It may further include a module 500.

The illuminance control module 500 controls the first, It performs the function of differentially controlling the illuminance of the 2 and 3 sub lights (42, 43, and 44). Here, differentially controlling the illuminance of the first, second, and third sub lights 42, 43, and 44 means that the distance between the main light 41 and the first sub light 42 (distance 1), the main light 41 This is because the distance between the main light 41 and the third sub light 43 (distance 2) and the distance between the main light 41 and the third sub light 44 (distance 3) cannot all be the same.

That is, the illuminance of the first sub-light 42 is controlled according to the illuminance of the main light 41 and distance 1, and the illuminance of the second sub-light 43 is controlled according to the illuminance of the main light 41 and distance 2. , Since the illuminance of the third sub-light 44 can be controlled according to the illuminance of the main light 41 and the distance 3, the illuminance of each sub-light 42, 43, and 44 can be differentially controlled.

Preferably, the higher the illuminance of the main light 41, the higher the illuminance of the sub lights 42, 43, and 44, and the distance between the main light 41 and the corresponding sub lights 42, 43, and 44 is long. The illuminance of the sub lighting can be increased.

Through this, it is possible to balance the illuminance between the main light 41 and the sub lights 42, 43, and 44, preventing excessive highlighting of specific parts of the performer's body and irradiating the lighting light evenly. .

Most preferably, the illuminance control module 500 can control the illuminance of the first, second, and third sub-lights 42, 43, and 44, respectively, according to the height and low of the illuminance value calculated through Equation 1 below. .

Equation 1,

Here, B(n) is the illuminance value of the nth sub-light, B(m) is the illuminance of the main light (lm), D(n) is the distance between the main light and the nth sub-light, and D(avg) is the main light. It means the average distance between the light and each of the 1st, 2nd, and 3rd sub-lights.

At this time, the distance between the main lighting and the specific sub-lighting refers to the distance between the center point of the main lighting and the specific sub-lighting.

For example, let's say that the illuminance of the main light is 300lm, the distance between the main light and the first sub-light is 3m, and the distances between the main light and the second and third sub-lights are 2m each. in this case,

Therefore, the illuminance value of the first sub-lighting is 257.40lx, and the illuminance value of the 2nd and 3rd sub-lighting is 208.43lx.

The illuminance of the 1st, 2nd, and 3rd sub-lights can be differentially controlled according to the illuminance numerical value calculated in this way. In other words, the illuminance of the first sub-light can be adjusted to 257.40lx, and the illuminance of the 2nd and 3rd sub-lights can be adjusted to 208.43lx.

Equation 1 is an equation that uses the hyperbolic tangent function to make the illuminance value increase as the distance between the main light and a specific sub-light increases, and the value is proportional to the illuminance of the main light.

Here, the illuminance value can be prevented from increasing too rapidly as the distance increases by indicating a smooth rise through the hyperbolic tangent function. Furthermore, the 1st, 2nd, and 3rd sub lights are sub lights that assist the main light. As it performs its role, no matter how high the illuminance level of the sub lighting becomes, it cannot exceed the illuminance level of the main lighting.

Therefore, the brightness of the sub-lighting can be calculated according to the distance and the height of the main lighting through the hyperbolic tangent function value, but the distance dependence can be appropriately adjusted to achieve balance by processing the distance variable with the hyperbolic tangent function. will be.

Therefore, the lighting consisting of the main lighting 41 and the 1st, 2, and 3 sub lights 42, 43, and 44, including the illuminance control configuration of the 1st, 2, and 3 sub lights 42, 43, and 44. Through the assembly 40, balanced illumination light can be irradiated from various angles to capture clearer, more balanced, three-dimensional and realistic chroma key images, thereby creating and providing more three-dimensional and realistic composite images.

Furthermore, in such a virtual stage experience-based activity video provision system, lighting or camera flash should not be reflected from the chroma key screen 11 located in the background of the chroma key image.

If lighting or flash is severely reflected on the chroma key screen (11), the clarity of the captured chroma key image may decrease. In this case, the contrast between the performer area and the background may be reduced in the captured chroma key image, so the background is removed. This is because the accuracy may decrease.

Therefore, to prevent this, the surface of the chroma key screen 11 may be coated with a diffuse reflection enhancer containing porous silica and polyethylmethacrylate.

Here, porous silica, the active ingredient of the diffuse reflection enhancer, is a material in which holes of various shapes and sizes are formed on the surface of silica. It has excellent extinction efficiency and can easily control gloss and extinction, so the effect of enhancing diffuse reflection through the extinction effect is very high. It is an excellent material.

Polyethyl methacrylate dries quickly, has excellent reversibility, does not easily cause yellowing, and can be coated with various solvents, so it not only has excellent physical properties as a coating agent, but can also form a coating film of uniform thickness, and further acts as a matting agent. Because this is excellent, it has an excellent effect of enhancing diffuse reflection and can minimize the effect of inhibiting discrimination due to light reflection.

As such a diffuse reflection enhancer is coated on the surface of the chroma key screen 11, it prevents sharpness impairment and contrast reduction that may occur as the illumination light irradiated on the performer is reflected from the chroma key screen 11, producing a clearer chroma key image. You can shoot.

In addition, the diffuse reflection enhancer may further include additional components in addition to porous silica and polyethyl methacrylate. The steps for manufacturing this diffuse reflection enhancer are described in more detail as follows.

Figure 7 is a flowchart showing the steps for manufacturing the diffuse reflection enhancer of the present invention.

Referring to FIG. 7, the diffuse reflection enhancer of the present invention includes a step of preparing a primary solution (S11), a step of preparing a secondary solution (S12), a step of preparing a tertiary solution (S13), and a fourth solution. It can be manufactured through the step of manufacturing (S15) and the step of completing the diffuse reflection enhancer (S15).

(S11) Step of preparing the first solution

A primary solution is prepared by mixing 20 to 40 parts by weight of porous silica, 30 to 50 parts by weight of distilled water, and 20 to 40 parts by weight of silver nitride.

In the above description, porous silica is made of a porous material and has an excellent extinction effect, and is therefore a material with excellent diffuse reflection properties.

In addition, the porous silica is dispersed using distilled water as a solvent, and the silver nitride added together is a starting material for silver nanoparticles that are coated on the surface of the porous silica through a process to be described later.

At this time, heating and stirring may be required to dissolve the silver nitride, and there are no particular restrictions on this.

(S12) Step of preparing secondary solution

Subsequently, 10 to 30 parts by weight of the prepared primary solution, 40 to 60 parts by weight of N,N-dimethyl formamide, and 5 to 15 parts by weight of polyvinyl pyrrolidone. Mix parts by weight to prepare a secondary solution.

Dimethylformamide is added as a polar organic solvent to allow mixing of the primary solution and the tertiary solution to be described later, and also acts as a reducing agent for the silver ions contained in silver nitride, converting the silver ions into silver nanoparticles. Let it be restored.

In the case of polyvinylpyrrolidone, it is added to improve the adhesion of the diffuse reflection enhancer, and at the same time, it acts as a reducing agent for silver ions and assists dimethylformamide.

(S13) Step of preparing tertiary solution

Next, 15 to 35 parts by weight of methyltrimethoxysilane, 20 to 40 parts by weight of distilled water, and 30 to 60 parts by weight of methanol are mixed to prepare a tertiary solution.

Methyltrimethoxysilane is added to increase the adhesion of the diffuse reflection enhancer, strengthen coating film formation, and improve transparency by increasing light transmittance. At this time, distilled water and methanol are used as solvents for methyltrimethoxysilane.

(S14) Step of preparing the fourth solution

When the preparation of the secondary solution and the tertiary solution are completed, 20 to 60 parts by weight of the secondary solution and 40 to 80 parts by weight of the tertiary solution are stirred at 20 to 40 ° C. for 1 to 4 hours and stirred at 15 to 30 ° C. The fourth solution is prepared by maintaining it for 160 to 200 hours.

The quaternary solution prepared in this way has porous silica dispersed in the form of silica sol, where silver nanoparticles are attached to the surface of the silica sol, and further, methyltriethoxysilane is mixed, resulting in improved optical properties. has

In addition, after stirring the secondary and tertiary solutions, the silica sol contained in the quaternary solution is stabilized through holding treatment at 15 to 30° C. for 160 to 200 hours, thereby obtaining a chemically stable solution.

(S15) Step of completing the diffuse reflection enhancer

Finally, 90 to 98 parts by weight of the fourth solution are mixed with 1 to 10 parts by weight of an antifouling agent containing 5 to 8 parts by weight of polyethylmethacrylate and perfluorooctyltrethoyxysilane. and maintained at 20 to 35°C for 1 to 3 hours to complete the diffuse reflection enhancer.

As explained above, polyethyl methacrylate is a material that dries quickly, has excellent reversibility, and does not easily cause yellowing. It can act as a matting agent, which not only increases matting properties, but also prevents yellowing of the coating film and prevents yellowing. It has the effect of increasing performance.

The antifouling agent contains perfluorooctyltretoxysilane as its active ingredient. Perfluorooctyltretoxysilane is a fluorosilane-based compound that only has the effect of increasing antifouling properties by forming a dense coating film on the surface when added to the coating agent. In addition, the density of the coating can be strengthened by increasing the wear resistance of the coating film and increasing the dispersibility of the porous silica sol contained in the diffuse reflection enhancer.

Furthermore, it goes without saying that not only polyethyl methacrylate but also antifouling enhancers have the property of dissolving well in distilled water and methanol, so they can be easily mixed into diffuse reflection enhancers.

In summary, the diffuse reflection enhancer manufactured through the above-described process used porous silica as a base material, which maximizes the extinction effect and enhances the diffuse reflection effect. Furthermore, the silver nanoparticles are adsorbed on the surface of the porous silica and are uniformly distributed within the diffuse reflection enhancer. It can be dispersed and exhibits dense film properties.

In addition, it exhibits a high level of light transparency and is not only antifouling but also has excellent discoloration resistance, and can maximize the diffused reflection effect by maximizing the extinction effect based on various materials.

Hereinafter, in order to explain the physical properties according to the configuration of the diffuse reflection enhancer of the present invention, the evaluation results of Examples and Comparative Examples will be compared and explained. The examples consist of Examples 1 and 2 containing the diffuse reflection enhancer of the present invention, and the comparative example is a conventional diffuse reflection coating composition.

<Example 1>

100g of the primary solution was prepared by mixing 30g of porous silica, 50g of distilled water, and 20g of silver nitride.

100 g of the secondary solution was prepared by mixing 30 g of the prepared primary solution, 55 g of N,N-dimethylformamide, and 15 g of polyvinylpyrrolidone.

100 g of the third solution was prepared by mixing 25 g of methyltrimethoxysilane, 30 g of distilled water, and 45 g of methanol.

40g of the prepared secondary solution and 60g of the prepared tertiary solution were stirred at 30°C for 3 hours and maintained at 20°C for 180 hours to prepare 100g of the fourth solution.

5 g of polyethyl methacrylate and 5 g of perfluorooctyltretoxysilane were mixed with 90 g of the prepared fourth solution and kept at 25°C for 2 hours to complete 100 g of diffuse reflection enhancer.

<Example 2>

100g of diffuse reflection enhancer was completed by mixing 5g of porous silica, 5g of polyethyl methacrylate, 5g of polyvinylpyrrolidone, 20g of N,N-dimethylformamide, 40g of distilled water, and 25g of methanol.

<Comparative Example 1>

Prepare 100g of a conventional anti-diffuse reflection hard coating composition by mixing 35g of isopropyl alcohol, 43g of ethyl cellosolve, 10g of pentaerythritol triacrylate, 10g of dipentaerythritol hexaacrylate, and 2g of 1-hydroxycyclohexylphenylketone. did.

At this time, the compositions of Examples 1 and 2 described above are shown in Table 1 below. Here, the unit of each value is weight%.

Example 1 Example 2 porous silica 3.24 5.00 Distilled water 21.60 40.00 Silver Night Ride 2.16 - N,N-dimethylformamide 19.80 20.00 polyvinylpyrrolidone 5.40 5.00 Methyltrimethoxysilane 13.50 - methanol 24.30 25.00 polyethyl methacrylate 5.00 5.00 Perfluorooctyltretoxysilane 5.00 -

The coating compositions of Examples 1 and 2 and Comparative Example were sprayed on the surface of a glass specimen measuring 1 meter long and 1 centimeter thick and then dried to form a coating layer on the surface of the specimen. The test methods for the coating compositions of Examples 1 to 2 and Comparative Examples prepared are as follows.

1. Hardness evaluation: Pencil hardness was measured using SHINTO Scientific's HEIDON-14EW device. When measuring pencil hardness, a pencil from MITSUBISHI was used and measured at speed: 60mm/min, scale: 10.0mm, force: 19.6N, load: 1kg, and angle between pencil and antifouling coating layer: 45°. The pencil hardness was measured five times repeatedly with a pencil of the same hardness, and the pencil hardness with the highest value among the pencil hardnesses where no scratches were visible on the coating layer was taken as the pencil hardness.

2. Accelerated Weathering Testing Evaluation: The color difference (△E) of the antifouling coating layer manufactured according to ASTM D-4587 regulations was measured. △E was measured by quantifying the degree of discoloration of the antifouling coating layer after antifouling coating for 2,000 hours.

3. Evaluation of light transmittance: Measured using a UV spectrometer and expressed as the transmittance for light in the 550 nm wavelength range.

4. Scratch resistance evaluation: A scratch resistance test using #0000 steel wool was performed (1Kg load, 10 round trips). The test results were shown as follows.

○: No surface damage

△: There is some surface damage.

×: There is a lot of surface damage

5. Adhesion evaluation: Cross Cut Cellotape peel test was performed on the coating layer film. That is, 11 cutting lines of the coating film reaching the substrate at 1mm intervals are inserted into the coating film, horizontally and vertically, to make 100 1mm2 eyes, then attach Sellotape on top of them and quickly peel them off. After repeating this operation 5 times, the results are shown as follows. It was.

○: No peeling of the coating film.

△: When the number of delaminated buds is 1-50

×: When the number of delaminated buds is 51-100

Table 2 is a table showing the test results. pencil hardness Accelerated weather resistance light transmittance scratch resistance Adhesion Example 1 9H 0.3 89.8 ○ ○ Example 2 8H 0.6 81.4 ○ △ Comparative Example 1 6H 1.2 78.2 △ ×

As shown in Table 2 above, it can be seen that the compositions of Examples 1 to 2 of the present invention are superior in pencil hardness, accelerated weathering resistance, light transmittance, imaging resistance, and adhesion compared to the comparative examples, and thus the visible light transmittance is not impaired. It can be confirmed that it has excellent adhesion, hardness, accelerated weathering resistance, and abrasion resistance.

In addition, through comparison of Examples 1 and 2, it can be confirmed that the coating composition of Example 1, which contains a more diverse composition, has superior overall physical properties compared to Example 2.

In addition, the above-mentioned antifouling enhancer may further include additional compositions in addition to perfluorooctyltretoxysilane. The steps for manufacturing this antifouling enhancer are described with drawings as follows.

Figure 8 is a flowchart showing the steps for manufacturing the antifouling agent of the present invention.

Referring to FIG. 8, the antifouling agent of the present invention can be manufactured through the steps of preparing the primary material (S21), preparing the secondary material (S22), and completing the antifouling agent (S23). there is.

(S21) Step of manufacturing primary material

First, a primary material is prepared by mixing 10 to 30 parts by weight of perfluorooctyltrethoyxysilane, 10 to 20 parts by weight of casein, and 50 to 80 parts by weight of ethanol.

Here, as described above, perfluorooctyltretoxysilane not only has the effect of increasing antifouling properties by forming a dense coating film on the surface when added to the coating agent, but also has the effect of increasing the wear resistance of the coating film. This perfluorooctyltretoxysilane is dissolved in ethanol as a solvent.

Casein added together is the main protein of milk and is a type of phosphorus protein, and α-casein, β-casein, and κ-casein are all collectively referred to as casein in the present invention.

Casein has good water resistance and high adhesion, so it is used as a raw material for food, medicine, industrial adhesives, paper coatings, and paints. It has the advantage of increasing the water resistance and adhesion of coating films with antifouling enhancers added and being environmentally friendly.

(S22) Step of manufacturing secondary material

Next, prepare a secondary material by mixing 80 to 90 parts by weight of the primary material, 10 parts by weight of arabinogalactan 5 naney, and 3 to 10 parts by weight of 1,2-hexanediol. do.

Arabinogalactan added here is a polysaccharide containing galactose, arabinose, etc., which can be obtained by extracting the roots and stems of the pine tree and the larch tree. This arabinogalactan can be used as a thickener and stabilizer and has excellent pH stability and salt resistance. When added to the antifouling enhancer, it increases the viscosity of the film, increases adhesion, stabilizes the solution, and further increases the pH stability and salt resistance of the coating film.

1, 2-hexanediol has the structure of a surfactant containing both hydrophobic and hydrophilic groups, and has excellent miscibility with both organic and inorganic substances. It is also known to have excellent antibacterial properties, enough to be used as a substitute for preservatives that inhibit or inhibit the growth of microorganisms. It is added to increase the preservability of the antifouling agent and to improve the miscibility between various substances.

(S23) Step of completing the antifouling enhancer

Finally, 90 to 95 parts by weight of the secondary material, 1 to 5 parts by weight of Lactamide MEA, and 1 to 3 parts by weight of Oxystearin are mixed to complete the antifouling agent.

Lactamide MEA is a type of water-soluble surfactant that has excellent mixing ability and functions to increase the mixing ability of antifouling enhancers. At the same time, it also acts as a thickener to increase the adhesion of the coating film to which antifouling enhancers have been added. .

Oxystearin is a glyceride mixture of partially oxidized stearic acid and other fatty acids, and is known to be added as a stabilizer or foam remover that can prevent or reduce the formation of foam.

In other words, not only does it remove bubbles that may be unnecessarily generated during the antifouling enhancer manufacturing process, especially the lactamide MA, which acts as a foaming agent, but also generates bubbles on the surface of the film to which the antifouling enhancer has been added, creating an even layer. It performs the function of preventing the formation of a film.

The anti-fouling agent of the present invention not only contains basic substances that can increase anti-fouling properties, but also increases adhesion, thereby preventing the coating film containing the anti-fouling agent from peeling off the surface of the chroma key screen, and has a miscibility. It also has excellent stability, pH stability, and salt resistance, and furthermore, it contains many eco-friendly substances to minimize risk to the environment.

As explained so far, the configuration and operation of the activity video providing system based on virtual stage experience according to the present invention are expressed in the above description and drawings, but this is only an example and the idea of the present invention is limited to the above description and drawings. Of course, various changes and modifications are possible without departing from the technical spirit of the present invention.

10: Chromakey zone 11: Chromakey screen
20: Camera 30: Main server
40: lighting assembly 41: main lighting
42: 1st sub lighting 43: 2nd sub lighting
44: Third sub lighting 51: Performer area
52: Background 100: Background database
200: background removal module 300: background synthesis module
400: Effect granting module 500: Illumination control module

Claims (8)

As an activity video provision system based on a virtual stage experience,
Chromakey zone equipped with chroma key screen;
a camera provided on one side of the chroma key zone, which generates a chroma key image of a performer with the chroma key screen in the background;
A background database storing a plurality of background images, a background removal module for removing the background from the chroma key image received from the camera, and a composite image by combining one of the background images with the chroma key image from which the background has been removed. A main server including a background synthesis module that generates a video providing system. According to clause 1,
The main server is,
An image providing system comprising an effect imparting module that applies a video editing technique to the synthesized video to provide a visual effect. According to clause 1,
The system is,
A main light provided on one side of the chroma key zone and irradiating illumination light to the performer in front of the performer;
a first sub-illuminator that irradiates illumination light to the performer from above the performer;
A lighting assembly including second and third sub-lights that are symmetrically disposed around the first sub-light and irradiate illumination light to the performer from both sides of the performer. According to clause 3,
The main server is,
and an illuminance control module that differentially controls the illuminance of the first, second, and third sub-lights according to the illuminance of the main light and the distance between the main light and each of the first, second, and third sub-lights. A video provision system. According to clause 4,
The illuminance control module is,
An image providing system, characterized in that the illuminance of the first, second, and third sub-lights is controlled according to the height and low of the illuminance value calculated through Equation 1 below.
Equation 1,
(Here, B(n) is the illuminance value of the nth sub-light, B(m) is the illuminance of the main light (lm), D(n) is the distance between the main light and the nth sub-light, and D(avg) is average distance between the main light and each of the 1st, 2nd, and 3rd sub lights) According to clause 1,
On the surface of the chromakey screen,
An image providing system, characterized in that it is coated with a diffuse reflection enhancer containing porous silica and polyethylmethacrylate. According to clause 6,
The diffuse reflection enhancer is,
Preparing a primary solution by mixing 20 to 40 parts by weight of porous silica, 30 to 50 parts by weight of distilled water, and 20 to 40 parts by weight of silver nitride;
Mix 10 to 30 parts by weight of the primary solution, 40 to 60 parts by weight of N,N-Dimethyl Formamide, and 5 to 15 parts by weight of polyvinyl pyrrolidone. Preparing a secondary solution;
Preparing a tertiary solution by mixing 15 to 35 parts by weight of methyltrimethoxysilane, 20 to 40 parts by weight of distilled water, and 30 to 60 parts by weight of methanol;
20 to 60 parts by weight of the secondary solution and 40 to 80 parts by weight of the tertiary solution are stirred at 20 to 40 ° C. for 1 to 4 hours and maintained at 15 to 30 ° C. for 160 to 200 hours to prepare a fourth solution. step;
Mix 90 to 98 parts by weight of the fourth solution with 1 to 10 parts by weight of an antifouling agent containing 5 to 8 parts by weight of polyethylmethacrylate and perfluorooctyltrethoyxysilane, and mix 20 to 20 parts by weight of the fourth solution. An image providing system, characterized in that it is manufactured through the step of completing the diffuse reflection enhancer by maintaining it at 35° C. for 1 to 3 hours. According to clause 7,
The antifouling agent,
Preparing a primary material by mixing 10 to 30 parts by weight of perfluorooctyltrethoyxysilane, 10 to 20 parts by weight of casein, and 50 to 80 parts by weight of ethanol;
A secondary material is prepared by mixing 80 to 90 parts by weight of the primary material, 10 parts by weight of 5 Arabinogalactan, and 3 to 10 parts by weight of 1,2-hexanediol. step;
Completing the antifouling agent by mixing 90 to 95 parts by weight of the secondary material, 1 to 5 parts by weight of Lactamide MEA, and 1 to 3 parts by weight of Oxystearin. Characterized by a video provision system.