KR101653353B1 - Method for representing virtual 3-Dimensional image based on virtual 3-Dimensional application in smart-phone - Google Patents

Method for representing virtual 3-Dimensional image based on virtual 3-Dimensional application in smart-phone Download PDF

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Publication number
KR101653353B1
KR101653353B1 KR1020150042664A KR20150042664A KR101653353B1 KR 101653353 B1 KR101653353 B1 KR 101653353B1 KR 1020150042664 A KR1020150042664 A KR 1020150042664A KR 20150042664 A KR20150042664 A KR 20150042664A KR 101653353 B1 KR101653353 B1 KR 101653353B1
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image
virtual
display
light source
photographed
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KR1020150042664A
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Korean (ko)
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황기현
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주식회사 나루씨이엠
동서대학교산학협력단
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    • H04N13/0011—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/44—Arrangements for executing specific programs
    • H04N13/0402—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

Abstract

The present invention relates to a virtual 3D representing method based on a smart phone virtual 3D display application. A virtual 3D representing system based on a smart phone virtual 3D display application comprises: a cloud based server system (10); a virtual 3D display (30b) installed in a smart phone (30); and a virtual 3D display application (30a). Therefore, the system can reduce a lot of measurement time and costs consumed during image modeling and image remodeling for a 3D display.

Description

[0001] The present invention relates to a smart-phone virtual-3D display app-based virtual-

The present invention relates to a virtual 3D display method based on a smartphone virtual 3D display application, and more particularly, to a smart 3D virtual display application based on a smart phone virtual 3D display method for allowing a user to arbitrarily adjust the position and intensity of a light source, Based virtual 3D presentation method.

In order to impose a realistic three-dimensional effect on a two-dimensional screen, a method of constructing a three-dimensional screen through a pipeline of a conventional three-dimensional graphics is generally used. This requires realistic modeling, texture representation, shading, and so on of real objects or objects.

In order to express reality realistically by using such conventional three-dimensional graphics, a lot of processes and efforts must be imposed. Therefore, it is general that an advertisement about a real object utilizes a still image, a moving image, and the like. However, in this case, there is a disadvantage that it can not give a three-dimensional stereoscopic effect.

Therefore, in order to realize realistic images, it is necessary to use techniques to increase the intuitiveness by using images photographed with real photographs, and to minimize the manufacturing cost and time in production.

There are video based lighting techniques for this. Image-based lighting is an attempt to model the reflection characteristics of real objects, and modeling of the reflection characteristics is indispensable to generate realistic scenes. In most cases, however, the reflective characteristics of the modeled object are very complex and very difficult to represent.

Accordingly, in the related art, the present invention focuses on the fact that, when the image-based lighting technique is performed in a smart phone by receiving image information of an image, the reflection characteristic of the object surface can be expressed using BRDF data In principle, if the BRDF data is measured on the object surface, accurate scene generation is possible. However, since BRDF data measurement also requires a lot of time and cost, there is a limit to utilize it. Therefore, the technology development to overcome these limitations is proposed I want to.

[Related Technical Literature]

1. A system and method for converting a three-dimensional object represented by a triangular mesh into a Dosurface representation method (Patent Application No. 10-2012-0022397 number)

2. REPRESENTATION AND RECORDING SYSTEM FOR DEPTH INFORMATION OF 3D OBJECT (Patent Application No. 10-2012-0020216)

3. SYSTEM AND METHOD FOR REPRESENTING 3D CONVEX OBJECT USING GEOMETRIC TEXTURE (Patent Application No. 10-2011-0038514)

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method of displaying a 3D display by measuring a BRDF data from a plurality of scene images without directly measuring the BRDF data, And to provide a virtual 3D display method based on a smart phone virtual 3D display app to overcome the limitations of a large amount of time and cost in the case of image modeling and image remodeling.

In addition, since the present invention uses images directly, it does not require complicated geometric information, can save time and cost for measuring BRDF data, and allows the user to arbitrarily adjust the position and intensity of the light source, To provide a virtual 3D display application-based virtual 3D representation method for a smartphone.

In addition, since the present invention can represent a rotation at a fixed time when a photographing form of a video image is a panorama image or a sphere image, a smart phone Virtual 3D display App-based virtual 3D presentation method.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a smartphone virtual 3D display app based virtual 3D display system according to an embodiment of the present invention constructs a radiance map from at least two or more scene images and then measures BRDF data from the radiance map A cloud-based server system (10) for performing image modeling to represent a 3D display, And reconstructs the reconstructed image by using the virtual 3D display 30b to obtain a stereoscopic image display range using brightness and contrast difference and depth 2a to 3d, the illumination device 4a is configured to express an image photographed at various angles on the image display unit 3a so as to move the image in various directions and angles using a programming technique, and to apply illumination to images photographed at various angles. A virtual 3D display app 30a for controlling and representing the virtual 3D display app 30a; And a control unit.

In order to achieve the above object, a smartphone virtual 3D display app-based virtual 3D display method according to an embodiment of the present invention is a method of displaying a virtual 3D display app based on a smartphone, in which a cloud-based server system 10 transmits an image to a smartphone 30 through a communication network 20 (Image photographed on the front side), image information 2 (image photographed on the upper side), and image information 3 (image photographed on the back side) in accordance with the position and brightness of the light source A first step of acquiring a plurality of input images obtained by varying a light source exposure time from one viewpoint in order to obtain an image photographed at an angle and an image taken at different brightness; And the cloud-based server system 10 can obtain one radiance map from image information 1 to image information 3, which are acquired images, and generate all of the radiance maps for each light source exposure time; And a light source modeling step of performing a light source modeling process.

After the second step, when the virtual 3D display application 30a of the smartphone 30 completes the light source modeling process by the cloud-based server system 10, the virtual 3D display application 30a receives the image information, A reconstruction (remodeling) step for generating image information; Is preferably performed.

If the intensity of the light source and the position of the light source are given as the light source parameter information for each light source, the virtual 3D display application 30a compresses the light source using the coefficients (coefficient parameters) obtained in the light source modeling process The BRDF data is reconstructed, the radiance map is reconstructed using the reconstructed BRDF data, and then the actual RGB image is generated and represented through the tone mapping method for the radiance map.

The smartphone virtual 3D display app-based virtual 3D display method according to the embodiment of the present invention constructs a radiance map from a plurality of scene images without directly measuring the BRDF data and measures BRDF data therefrom In the case of image modeling and image remodeling to represent a 3D display, it provides an effect of overcoming limitations that require a lot of time and cost of measurement.

That is, since the image is directly used, the time and cost for measuring BRDF data can be reduced without requiring complicated geometric information, and the user can arbitrarily adjust the position and intensity of the light source, This provides a possible effect.

In addition, according to another embodiment of the present invention, a smart 3D virtual display application-based virtual 3D representation method is a method of representing a rotation at a fixed time when a photographing form of a video image is a panorama image or a sphere image So that it provides a high-quality visualization effect due to a change in realistic illumination.

1 is a diagram illustrating a virtual 3D display system based on a smartphone virtual 3D display app according to an embodiment of the present invention.
2 is a diagram showing a virtual 3D display 30b on the smartphone 30 of Fig.
3 is a diagram for explaining the structure of a data packet for image information transmitted from the cloud-based server system 10 to the smartphone 30.
4 is a diagram illustrating a process performed by the cloud-based server system 10 among the smart 3D virtual display application-based virtual 3D representation methods according to the embodiment of the present invention.
5 is a diagram illustrating a process performed by the smartphone 30 among the smartphone virtual 3D display app based virtual 3D rendering method according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of preferred embodiments of the present invention will be given with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In the present specification, when any one element 'transmits' data or signals to another element, the element can transmit the data or signal directly to the other element, and through at least one other element Data or signal can be transmitted to another component.

1 is a diagram illustrating a virtual 3D display system based on a smartphone virtual 3D display app according to an embodiment of the present invention. Referring to FIG. 1, a virtual 3D display application based virtual 3D display system of a smartphone displays objects / objects in a virtual 3D form in a smartphone 30 through interoperation with a cloud-based server system 10, (30) must have a virtual 3D display app (30a).

The virtual 3D display app 30a is a program for expressing a virtual 3D display and is an app program for designing an object / object to be displayed in 3D by using depth and lighting on a liquid crystal screen of a smart phone 30 which is generally used .

The virtual 3D display 30b provided in the smartphone 30 is a screen that is designed to allow a user to feel a three-dimensional image when viewed in the naked eye by virtually applying depth and illumination to images taken at various angles .

The cloud-based server system 10 is a server system for storing images of various types of objects / objects taken at various angles. The cloud-based server system 10 is a server system for storing images of various types of objects / objects through a communication network 20 such as Internet / LTE / LTE / And transmits the stored image to the phone 30.

Accordingly, the virtual 3D display app 30a of the smartphone 30 performs object / object information display, virtual 3D image display, and company information display on the virtual 3D display 30b.

2 is a diagram showing a virtual 3D display 30b on the smartphone 30 of Fig. Referring to FIG. 2, a stereoscopic image display range 2a using a smartphone liquid crystal screen outline range 1a, brightness and contrast difference and depth, and an image photographed at various angles are recorded in various directions and angles , And an illumination device 4a for applying illumination to an image photographed at various angles.

3 is a diagram for explaining the structure of a data packet for image information transmitted from the cloud-based server system 10 to the smartphone 30. Referring to FIG. 3B, the cloud-based server system 10 is a DB server that stores various types of images in a cloud-based manner.

The cloud-based server system 10 includes a number, a product name, image information 1 to image information 5 in a data packet unit, and transmits it to the smartphone 30. Here, the image information 1 is an image taken from the front, the image information 2 is an image taken from the upper part, the image information 3 is an image taken from the back side, the image information 4 is an image taken at a different angle, Quot ;, and "

The light source modeling for virtual 3D representation by the cloud-based server system 10 in such a smartphone virtual 3D display app-based virtual 3D representation system will be described with reference to FIG. That is, FIG. 4 is a diagram illustrating a process performed by the cloud-based server system 10 among the smart 3D virtual display application-based virtual 3D representation methods according to the embodiment of the present invention.

Referring to FIG. 4, the steps related to the light source modeling performed by the cloud-based server system 10 are roughly divided into three steps.

[Step 1 (step 1-1): radiance map sampling process]

The cloud-based server system 10 transmits the image information from the image information 1 to the image information 3 to the smartphone 30 through the communication network 20 at a differentiated angle according to the position and brightness of the light source In order to obtain the photographed image and the image taken at different brightness, a plurality of input images obtained by changing the light source exposure time from one viewpoint are acquired.

Thereafter, the cloud-based server system 10 obtains one radiance map from the acquired image information 1 to image information 3, and generates all the radiance maps for each light source exposure time.

Here, the radiance map can be obtained by fixing the camera and photographing an object with different exposure times at a predetermined interval in the horizontal direction and the vertical direction.

[Step 2 (stetp 1-2): Bidirectional Reflectance Distribution Function (BRDF) measurement procedure]

Since the characteristics of the surface of the object / object are information reflected from the light source, the BRDF data is necessary for the smartphone 30 to reconfigure the scene.

Accordingly, the cloud-based server system 10 is an algorithm for acquiring BRDF data from the radiance map obtained in the first step, and is described by Tien-Tsin Wong as "TT Wong, PA Heng, SH Or and WY Ng, The approach (Tien-Tsin Wong method) proposed in Rendering with controllable Illumination, "In 8th EUROGRAPHICS Workshop on Rendering, pp. 13-22, 1997."

[Step 3 (stetp 1-3): Data Compression Process]

The BRDF data obtained in the second step is inefficient because it actually requires a lot of storage space. Therefore, the cloud-based server system 10 performs compression by introducing a spherical harmonic compression scheme to store a large amount of BRDF data. The coefficient is obtained by using the BRDF data obtained by the spherical harmonic compression method as input data, and this coefficient is used as a parameter to restore the BRDF data compressed by the smartphone 30 later.

The mathematical methods for storing compressed BRDFs are described in Brian's method (C. Brian, M. Nelson and S. Rebecca, "Bidirectional reflection functions from surface bump maps," In Computer Graphics, SIGGRAPH87, vol.21, -281, 1987.) The Brian method is a method for efficiently storing compressed BRDF data by using spherical harmonics. The position of the light source is varied to obtain coefficients using previously obtained BRDF data, The coefficient is again used to obtain BRDF data at an arbitrary position.

The light source reconfiguration process of the smartphone 30 that has received the light source modeling data for virtual 3D representation by the cloud-based server system 10 in the smartphone virtual 3D display app based virtual 3D representation system will be described with reference to FIG. 5 Explain it. That is, FIG. 5 is a diagram illustrating a process performed by the smartphone 30 among the smart 3D virtual display application-based virtual 3D representation methods according to the embodiment of the present invention.

That is, the virtual 3D display application 30a of the smartphone 30 receives the image information when the light source modeling process is completed by the cloud-based server system 10, and generates image information that is a scene according to the position or type of the light source A remodeling step is required.

[Step 1 (step 2-1): Radiance map reconstruction process]

When the intensity of the light source and the position of the light source are given as the light source parameter information for the arbitrary light source, the virtual 3D display app 30a restores the compressed BRDF data using the coefficient (coefficient parameter) obtained in the third step of the light source modeling And then reconstructs a new radiance map by using it.

[Step 2-2: Scene Rendering Process]

The virtual 3D display application 30a creates an actual RGB image through the tone mapping method for the new radiance map acquired in the first step. At this time, in order to change the actual brightness to the brightness of the screen, the virtual 3D display app 30a must consider two aspects, namely, visualization and contrast control.

First, the visualization that the virtual 3D display application 30a should be displayed on the screen for an object / object actually displayed and the brightness in the real world have a brightness value in a wide range. Therefore, When the brightness value is changed to the brightness value on the upper side, it is the contrast of contrast which should be contrasted with the brightness value displayed on the UI screen.

In order to satisfy these two requirements, the virtual 3D display application 30a uses an adaptive histogram method (GJ Ward, H. Rushmeier and C. Piatko, "A " Technical Report, LBNL-39882, Lawrence Berkeley National Laboratory, 1997.).

For the reconstructed image, the virtual 3D display application 30a displays a variety of images in the image display unit 3a among the stereoscopic image display range 2a using brightness, contrast, and depth using the virtual 3D display 30b An image photographed at an angle is expressed by moving the image in various directions and angles using a program technique, and the illumination device 4a for applying illumination to images photographed at various angles is controlled and expressed.

That is, in order to provide a stereoscopic effect to a video creator who provides an image to a cloud-based server system 10 in order to expand to a stereoscopic image, the present invention uses a 3D graphics pipeline instead of a geometric modeling- In this paper, we propose a 3D rendering method based on BRDF data, which is reflection information of a surface, by using an image sequence having different exposures at the shooting stage.

In addition, the contents of the present invention can extract the same information through the stereoscopic camera existing in the image photographing step. In other words, if the proposed algorithm is acquired simultaneously through two cameras with different time differences, a stereoscopic effect through binocular disparity may be provided.

In this case, it is possible to provide the stereoscopic image and the realistic brightness according to the illumination, so that the smartphone 30, which is a mobile device with a limited performance, can provide satisfaction of the user experience according to various stereoscopic information provision.

The present invention can also be expressed as a computer-readable code on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored.

Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and also expressed in the form of a carrier wave (for example, transmission over the Internet) .

The computer readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And functional programs, codes, and code segments for representing the present invention can be easily inferred by programmers of the art to which the present invention pertains.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they have been used only in a general sense to easily describe the technical contents of the present invention and to facilitate understanding of the invention , And are not intended to limit the scope of the present invention. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: Cloud-based server systems
20: Network
30: Smartphone
30a: Virtual 3D display app
30b: Virtual 3D display

Claims (4)

delete A radiance map is formed from at least two scene images and BRDF data is measured therefrom. Then, image modeling for expressing a 3D display is performed. Various types of objects and objects are photographed at various angles Image information 1 which is an image photographed from the front, image information 2 which is an image photographed from the upper part, image information 3 which is an image photographed from the back side, image information which is an image photographed at a different angle, 4, a cloud-based server system 10 for transmitting a data packet in which image information 5, which is an image taken at a different brightness, is sequentially arranged to the smartphone 30;
The smartphone 30 is provided with a depth and a light that are virtually applied to an image photographed at various angles, and corresponds to a screen designed to allow a user to feel three-dimensional when viewing the naked eye. A stereoscopic image display range 2a using brightness and contrast difference and depth, an image display unit 3a for displaying an image photographed at various angles in various directions and angles, A virtual 3D display 30b in which an illumination device 4a for illuminating an image is separately formed;
The virtual 3D display 30b displays object and object information, displays a virtual 3D image, displays company information, receives image-modeled image information by the cloud-based server system 10, reconstructs it, The image obtained by photographing the image from various angles on the image display unit 3a among the stereoscopic image display range 2a using brightness and contrast difference and depth using the virtual 3D display 30b can be displayed in various directions A virtual 3D display app 30a for displaying and controlling the lighting device 4a, which is expressed to move at an angle, and applies illumination to an image taken at various angles; And a virtual 3D display system based on a smartphone virtual 3D display app,
In order for the cloud-based server system 10 to transmit image information to the smartphone 30 through the communication network 20, the image information 1 (image photographed from the front side), image information 2 (image photographed from the upper side) 3 images (images photographed from the back side), the light source exposure time is different from one viewpoint in order to obtain an image photographed at a differentiated angle according to the position and brightness of the light source and an image photographed at different brightness A first step of acquiring a plurality of input images obtained;
The cloud-based server system 10 can obtain one radiance map from the acquired image information 1 to image information 3, and generates all the radiance maps for each light source exposure time, A second step of obtaining an object by photographing an object with different exposure times in a horizontal direction and a vertical direction at a light source;
The cloud-based server system 10 has been proposed by Tien-Tsin Wong (Tien-Tsin Wong method: TT Wong, PA Heng, SH Or and WY Ng, "Image-based Rendering with controllable Illumination", In 8th EUROGRAPHICS (See Workshop on Rendering, pp. 13-22, 1997), and acquiring BRDF data from the radiance map obtained in the step 2;
The cloud-based server system 10 adopts the spherical harmonic compression method to compress and store the BRDF data. The BRDF data obtained by the spherical harmonic compression method is used as input data to obtain and store a coefficient, The mathematical method for storing the compressed BRDF is used in the Brian method (C. Brian, M. Nelson and S. Rebecca, "Bidirectional reflection functions from surface bump maps, "In Computer Graphics, SIGGRAPH87, vol.21, pp. 273-281, 1987);
The virtual 3D display application 30a restores the compressed BRDF data using the intensity of the light source for any light source given as the light source parameter information, the position of the light source, and the coefficient (coefficient parameter) obtained in the fourth step, A fifth step of reconstructing a new radiance map;
The virtual 3D display application 30a creates an actual RGB image through the tone mapping method on the new radiance map acquired in the fifth step and the virtual 3D display application 30a uses the image information 4 and the image information 5 Adaptive Histogram Method by Controlling Exposure Time (GJ Ward, H. Rushmeier and C. Piatko, "A visibility matching tone reproduction operator for high dynamic range scenes," Technical Report, LBNL-39882, Lawrence Berkely National Laboratory, A sixth step in which the actual brightness is changed to the brightness of the screen while satisfying the visualization and the contrast control;
The virtual 3D display application 30a displays the virtual 3D display 30b on the image representation unit 3a among the stereoscopic image display range 2a using the brightness and the contrast difference and depth for the reconstructed image A seventh step of expressing the image photographed at various angles by the program method so as to move the image in various directions and angles and controlling and expressing the illumination device 4a for applying the illumination to the images photographed at various angles, The light source modeling for the virtual 3D representation by the cloud-based server system 10 and the light source reconstruction of the smartphone 30 receiving the light source modeling data for the virtual 3D representation by the cloud- A virtual 3D display app based on a smart phone. delete delete
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101976801B1 (en) * 2019-02-08 2019-05-09 주식회사 인포인 System Providing 3D Video Optimization And Compression
US20220123848A1 (en) * 2019-01-21 2022-04-21 Nec Corporation Wireless communication quality visualization system, wireless communication quality visualization device, and measurement apparatus
KR102577793B1 (en) * 2022-07-22 2023-09-12 주식회사 트리플 System for generating 3D product showcase

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US20220123848A1 (en) * 2019-01-21 2022-04-21 Nec Corporation Wireless communication quality visualization system, wireless communication quality visualization device, and measurement apparatus
KR101976801B1 (en) * 2019-02-08 2019-05-09 주식회사 인포인 System Providing 3D Video Optimization And Compression
KR102577793B1 (en) * 2022-07-22 2023-09-12 주식회사 트리플 System for generating 3D product showcase

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