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WO2021045500A1 - Procédé de génération d'image tridimensionnelle pour hmd à partir d'une image bidimensionnelle - Google Patents

Procédé de génération d'image tridimensionnelle pour hmd à partir d'une image bidimensionnelle Download PDF

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Publication number
WO2021045500A1
WO2021045500A1 PCT/KR2020/011765 KR2020011765W WO2021045500A1 WO 2021045500 A1 WO2021045500 A1 WO 2021045500A1 KR 2020011765 W KR2020011765 W KR 2020011765W WO 2021045500 A1 WO2021045500 A1 WO 2021045500A1
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Prior art keywords
image
generating
hmd
eye
depth
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Ceased
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PCT/KR2020/011765
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English (en)
Korean (ko)
Inventor
양병석
홍광진
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Comixv Inc
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Comixv Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106—Processing image signals
    • H04N13/111—Transformation of image signals corresponding to virtual viewpoints, e.g. spatial image interpolation
    • H04N13/117—Transformation of image signals corresponding to virtual viewpoints, e.g. spatial image interpolation the virtual viewpoint locations being selected by the viewers or determined by viewer tracking
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T15/00—3D [Three Dimensional] image rendering
    • G06T15/10—Geometric effects
    • G06T15/20—Perspective computation
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T15/00—3D [Three Dimensional] image rendering
    • G06T15/10—Geometric effects
    • G06T15/20—Perspective computation
    • G06T15/205—Image-based rendering
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/11—Region-based segmentation
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/50—Depth or shape recovery
    • G06T7/55—Depth or shape recovery from multiple images
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]

Definitions

  • the present invention relates to generating a 3D image, and more specifically, to a method of generating a 3D image from a 2D image for generating a 3D image using a single 2D image and a depth image. .
  • Virtual reality is a distorted three-dimensional reality provided by a computer, and it focuses on reducing the sense of heterogeneity with the real space.
  • Virtual reality is mainly provided through a head mount device (HMD), and since the user's field of view is blocked by the HMD, the user cannot perceive other images other than the provided virtual space image. Therefore, there is an advantage of allowing the user to have a sense of immersion in a given image.
  • HMD head mount device
  • Sphere Toon can be defined as a cartoon platform that provides digital cartoon content such as webtoon in VR (Virtual Reality). Install the speartoon app on your smartphone and configure the screen so that you can enjoy it by attaching a Head Mount Device (HMD). In this case, the characters, backgrounds, objects, etc. of the webtoon provided by the speartoon application are expressed, and layers for each object are all arranged differently.
  • HMD Head Mount Device
  • the three-dimensional implementation method of this type corresponds to a method of arranging each object after drawing in consideration of the arrangement in advance.
  • the background and each object In order to display a two-dimensional image in three dimensions, the background and each object must be configured separately.
  • each object In order to change the screen composition, each object must be reconfigured, so there is a limit to freely changing the screen composition.
  • a method of transmitting each image to both eyes of an HMD wearer based on images obtained through two cameras is also used.
  • the method of generating a three-dimensional image from a two-dimensional image according to an embodiment of the present invention is based on the degree of three-dimensional effect to be obtained according to the principle of binocular parallax, a principle of human stereoscopic perception, from a single 2D image using a computer device.
  • a method of generating a 3D image for an HMD from a 2D image for solving the above technical problem includes: generating a first equirectangular panoramic image for a 360-degree space; Extracting a depth image from the first panoramic image; Generating a left-eye image by matching the first panoramic image and the depth image with a square cube map consisting of a front, left, rear, right, plane and bottom surface; Dividing a region overlapping the continuous images of the front, left, rear, and right sides of the cubemap image from the first panorama image into two-dimensional images of equal intervals set in advance; And generating a first stereoscopic right-eye image using a preset algorithm for the divided 2D image.
  • it may include providing the left-eye image and the first stereoscopic right-eye image as left and right images for applying to the HMD, respectively.
  • the preset equal interval may be obtained by dividing the first equirectangular panoramic image for the 360-degree space into eight.
  • a method for generating a 3D image for an HMD from a 2D image includes: generating a second equirectangular panoramic image for a 360-degree space; Inputting isotropic depth image information for a 360-degree space corresponding to the second panoramic image; Separating regions of different depth values from the second panoramic image using the depth image information; Generating a left-eye image by matching the separated area to n (n ⁇ 0, integer) square cube maps consisting of a front, left, rear, right, plane, and bottom surface; And generating a second stereoscopic right-eye image using the left-eye image using a preset algorithm.
  • it may include providing the left-eye image and the second stereoscopic right-eye image as left and right images for applying to the HMD, respectively.
  • the preset equal interval may be obtained by dividing the second equirectangular panoramic image for the 360-degree space into eight.
  • the method of generating a three-dimensional image from a two-dimensional image according to an embodiment of the present invention is based on the degree of three-dimensional effect to be obtained according to the principle of binocular parallax, a principle of human stereoscopic perception, from a single 2D image using a computer device.
  • a 3D image can be generated by providing an image with a different viewing angle by extracting the binocular parallax angle from the depth image and rearranging the original image according to the extracted angle, providing the deformed image and the original image as a pair of stereoscopic images.
  • Simple 3D digital cartoon content can be provided without consuming a lot of power.
  • FIG. 1 is a diagram showing a system block diagram of the present invention.
  • FIG. 2 is a flowchart illustrating a method of generating a 3D image for an HMD from a 2D image according to an embodiment of the present invention.
  • FIG. 3 is a system configuration diagram according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a 360 degree panoramic image and a depth image thereof.
  • FIG. 5 is a diagram illustrating an equirectangular drawing method for a 360 degree panoramic image.
  • FIG. 6 is a diagram illustrating a cube map for mapping a 360 degree panoramic image.
  • FIG. 7 is a diagram illustrating areas in which the front, left, rear, and right surfaces of a cube map are shown in an isometric diagram.
  • FIG. 8 is a conceptual diagram of a right-eye image generated using a left-eye image and a depth image.
  • FIG. 9 is a diagram illustrating a distance to an actual object corresponding to a depth image.
  • 10 to 13 are exemplary diagrams of a method of generating a 3D image for an HMD from a 2D image according to another embodiment of the present invention.
  • the present invention is not limited to the embodiments disclosed below, and may be implemented in various different forms.
  • the present embodiments are provided only to make the disclosure of the present invention complete, and to fully inform the scope of the invention to those skilled in the art to which the present invention pertains, and the present invention is defined by the scope of the claims. It just becomes. Therefore, the definition should be made based on the contents throughout the present specification.
  • each component, functional blocks or means may be composed of one or more sub-components, and the electrical, electronic, and mechanical functions performed by each component are an electronic circuit, It may be implemented with various known devices or mechanical elements such as an integrated circuit and an application specific integrated circuit (ASIC), and may be implemented separately or two or more may be integrated into one.
  • ASIC application specific integrated circuit
  • combinations of each block of the attached block diagram and each step of the flowchart may be performed by computer program instructions.
  • These computer program instructions can be mounted on the processor of a general purpose computer, special purpose computer, portable notebook computer, network computer, mobile device such as a smart phone, an online game service providing server or other programmable data processing equipment.
  • the instructions, executed by the processor of the possible data processing equipment, will create means for performing the functions described in each block of the block diagram or each step of the flow chart, which will be described below.
  • each block or each step may represent a module, segment, or part of code that contains one or more executable instructions for executing the specified logical function(s).
  • functions mentioned in blocks or steps may occur out of order.
  • two blocks or steps shown in succession may in fact be performed substantially simultaneously, or the blocks or steps may sometimes be performed in the reverse order depending on the corresponding function.
  • the term user device means all calculation means capable of collecting, reading, processing, processing, storing, and displaying data such as a desktop computer, a notebook computer, a smart phone, a PDA, a mobile phone, and a game machine. do.
  • the user device in the embodiment of the present invention is a device having a function of executing software written in readable code, and displaying and delivering it to the user.
  • the software can be stored on its own or can be read together with data from the outside.
  • the terminal in the embodiment of the present invention includes not only the above data processing functions but also functions such as input, output, and storage, and for this purpose, CPU, main board, graphic card, hard disk, Not only various elements such as sound card, speaker, keyboard, mouse, monitor, USB, communication modem, etc., but also CPU, main board, graphic chip, memory chip, sound engine, speaker, touch pad, USB, etc. of wireless smartphone terminals. It may include an external connection terminal, a communication antenna, a communication modem capable of implementing communication such as 3G, LTE, LTE-A, WiFi, and Bluetooth.
  • FIG. 1 is a diagram showing a system block diagram of the present invention
  • FIG. 2 is a diagram showing a flow chart of a method for generating a 3D image for an HMD from a 2D image according to an embodiment of the present invention
  • a method of generating a 3D image for an HMD from a 2D image may be performed by a user device or a service server relaying a user and a third party.
  • the user device or service server is provided to transmit and receive various types of information in a wired or wireless manner, such as when used in a method of generating a 3D image for an HMD from a 2D image or when transmitting a left or right eye image to the HMD.
  • the image generator may be provided to generate an image, such as a case of mapping a panoramic image or a panoramic image to a cube map for use in a method of generating a 3D image for an HMD from a 2D image.
  • the image conversion unit may be provided to extract the depth image or to divide the generated image in a set manner.
  • the service server 100 when the method of generating a 3D image for an HMD from a 2D image according to an embodiment of the present invention is performed by the service server 100, the service server 100 is transmitted from the user device. After processing and editing the image information using the image information, it is transmitted to the third user device so that the user of the third user device can enjoy the 3D image through the HMD.
  • a method of generating a 3D image for an HMD from a 2D image according to an embodiment of the present invention includes 3D images for an HMD from a 2D image according to an aspect of the present invention for solving the above technical problem.
  • the method of generating a dimensional image includes generating an equirectangular first panoramic image for a 360-degree space (S110).
  • the first panoramic image may be received and used from a user device or the like.
  • the first panoramic image is an image representing a 360-degree space starting from the left as the starting point of the image, and may be provided so as to end at the right end of the image.
  • FIGS. 4 and 5 it can be seen that a 360-degree panoramic image represented by an equirectangular diagram in which a three-dimensional space is expressed in one plane is expressed.
  • (b) corresponding to the depth image is extracted from (a), which is an example of the first panorama image.
  • a first panorama image as a color image, it may be divided into pixels of regions having different depth values. It can be expressed as a depth image to apply different shades and shades to the pixels and use the degree of each shade as information on the depth value.
  • the degree of contrast may be provided to be expressed as n integers (n ⁇ 0) according to a preset method.
  • a step of generating a left-eye image by matching the first panorama image and the depth image with a square cube map consisting of a front, left, rear, right, plane, and bottom surface (S130).
  • the first panoramic image expressed by the isotropic drawing method is matched to the cube map, it is divided into a total of six images.
  • the cube map can be used by matching images corresponding to the front, left, back, right, plane, and bottom surfaces.
  • FIG. 7 is a diagram illustrating areas in which the front, left, rear, and right surfaces of a cube map are shown in an isometric diagram. Referring to FIG. 7, it can be seen that on the first panoramic image expressed by the equirectangular drawing method, portions in which the continuous surfaces of the front, left, rear, and right surfaces of the cube map excluding the plane and the bottom are expressed are represented by shades. .
  • the method of generating a three-dimensional image for an HMD from a two-dimensional image according to an embodiment of the present invention is to express a three-dimensional effect of the image in the direction the user is looking at. Since the definition of the left/right eye area is changed according to the user's gaze change, it may be provided to apply the depth value only to the front, left, rear, and right areas, excluding the depth value application area. .
  • FIG. 8 is a conceptual diagram of a right-eye image generated using a left-eye image and a depth image
  • FIG. 9 is a diagram illustrating a distance to an actual object corresponding to the depth image.
  • the difference between the left and right eye images can be calculated using a baseline corresponding to the distance between the left and right eyes and the distance between the first object P1 and the second object P2. I can. That is, it can be seen that the relatively close first object P1 has a larger binocular disparity value (l1-r1> l2-r2) than the second object P2.
  • a left eye image may be generated by correspondingly adjusting the pixel position of the input image.
  • a step of dividing a region overlapping the continuous images of the front, left, rear and right sides of the cubemap image from the first panoramic image into a two-dimensional image of equal intervals set in advance (S140).
  • each region may be divided into 45 degree intervals corresponding to 1/8 of the total 360 degree space.
  • the present invention is not limited thereto, and the area may be divided at appropriate equal intervals if necessary.
  • a right-eye image includes generating a first stereoscopic right-eye image with a preset algorithm for the divided 2D image (S150).
  • a right-eye image may be generated through a distance corresponding to the distance between the left-eye image and the left-right and both eyes, and a distance between the object.
  • VR devices such as HMD have a distance from the bodily sensation screen of about 1 to 2 m, so the farthest distance is less than about 2 m, and the latest distance is also set larger than the focal length provided by the device (the distance between the lens and the eye). It is desirable to be.
  • the distance between the object and the left or right eye is less than or equal to about 1.5 m, and may be set to be greater than the distance between the lens of the HMD and the left or right eye.
  • the method of generating a 3D image for an HMD from a 2D image according to an embodiment of the present invention further includes providing the left-eye image and the first stereoscopic right-eye image as left and right images for applying to the HMD, respectively. can do.
  • Each image provided as a left and right image is transmitted to a third user and transmitted to be displayed on the left and right eyes of the HMD, so that the third user can enjoy a three-dimensional image.
  • a method of generating a 3D image for an HMD from a 2D image extracts a depth image from one panoramic image, expresses each image using an equirectangular diagram, and then matches it to a cube map. In the state, the image is separated into the remaining images except the upper and lower images, and it is converted into a panoramic image of equirectangular diagram, and divided into equal parts to create a left-eye image and a right-eye image.Therefore, it can be played back in the HMD using one two-dimensional image. A possible three-dimensional image can be provided.
  • a method of generating a 3D image for an HMD from a 2D image according to another embodiment of the present invention includes generating a second equirectangular panoramic image for a 360-degree space.
  • the second panoramic image may correspond to a two-dimensional image drawn by a user.
  • the depth image information may be extracted from the first panoramic image.
  • the present invention is not limited thereto, and may be provided so that a user may arbitrarily create depth image information to generate a left-eye or right-eye image together with the second panoramic image.
  • the depth image information extracted from the first panorama image may be converted into a 3D image harmonized with the first panorama image by being provided as a depth value for the divided image expressed in the second panorama image.
  • the cubemap may be provided as a left eye image for delivering a three-dimensional effect as two or more images having various depth values.
  • a right-eye image may be generated through a proportional equation using a distance between two eyes of a user corresponding to a distance between the lenses of both eyes of the HMD and a distance (depth value) with at least one object.
  • the left-eye image and the second stereoscopic right-eye image may include providing the left-eye image and the second stereoscopic right-eye image as left and right images for applying to the HMD, respectively.
  • the left-eye image and the right-eye image may be provided as a single image having a three-dimensional effect to a user wearing an HMD through a visual difference.
  • the preset equal interval may be obtained by dividing the first equirectangular panoramic image for the 360-degree space into eight. For example, instead of generating the entire right-eye image for the first panorama image while the left-eye image is fixed, each of the front, left, back, and right sides of the matched cube map is divided into equal parts for each divided area. Left-eye and right-eye images may be generated, in which case, each area may be divided at 45 degree intervals corresponding to 1/8 of the total 360 degree space.
  • 10 to 13 are exemplary diagrams of a method of generating a 3D image for an HMD from a 2D image according to another embodiment of the present invention.
  • a panoramic image in which a continuous image consisting of front, left, rear and right surfaces excluding areas corresponding to the top and the bottom in one cube map is expressed by the isometric drawing method.
  • extracting the depth image from the panoramic image is illustrated in FIG. 11.
  • the depth image is converted into depth information of a preset value for each object on the panorama image, and may be used to implement the depth level for each object.
  • a left-eye image and a right-eye image can be generated respectively through a proportional equation using the distance between the user's eyes and the distance to each object.
  • FIG. 12 shows a left-eye image using an algorithm using a proportional equation
  • FIG. 13 shows a right-eye image using an algorithm of a proportional equation.
  • the left-eye and right-eye images are provided, so that a VR image having a three-dimensional effect from one image can be provided through the HMD, even if excessive computing power is not required.
  • a depth image for providing a depth value to each object of the panoramic image is additionally input, and the panoramic image and the depth
  • the values excluding the plane and bottom images of the cube are converted into a panorama image and used, instead of using the images of the front, left, rear, and right sides corresponding to the horizontal image of the cube map from the beginning.
  • Depth image information corresponding to this may be input to the user device to generate a new panoramic image.
  • the new panoramic image thus prepared may be provided to be converted into a left-eye image and a right-eye image from a proportional expression using a depth value of an object expressed on the image, a distance between the user's eyes, and a virtual line in a direction perpendicular to the user.
  • the detailed algorithm is omitted because it is based on the example described above.
  • a method of generating a 3D image for an HMD from a 2D image uses a single 360-degree image that has been edited by a user to provide a left-eye image and a right-eye image to the HMD.
  • a single 360-degree image that has been edited by a user to provide a left-eye image and a right-eye image to the HMD.
  • Content provided in this way can be highly useful because it can be provided as an image with a three-dimensional effect through an HMD, especially when grafted to a two-dimensional digital cartoon provided by an artist.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Vision & Pattern Recognition (AREA)
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  • Computer Graphics (AREA)
  • Processing Or Creating Images (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)

Abstract

L'invention concerne un procédé de génération d'une image tridimensionnelle pour un casque de réalité virtuelle (HMD) à partir d'une image bidimensionnelle, ledit procédé comprenant les étapes consistant : à générer une première image panoramique équirectangulaire par rapport à un espace à 360 degrés ; à extraire une image de profondeur à partir de la première image panoramique ; à générer une image d'œil gauche par mise en correspondance de la première image panoramique et de l'image de profondeur avec une texture cubique carrée comprenant une surface avant, une surface côté gauche, une surface arrière, une surface côté droit, une surface plane et une surface inférieure ; à diviser, à partir de la première image panoramique, une zone chevauchant des images consécutives de la surface avant, de la surface côté gauche, de la surface arrière et de la surface côté droit de l'image de texture cubique en images bidimensionnelles ayant des intervalles uniformes prédéterminés ; et à générer une première image d'œil droit stéréoscopique au moyen d'un algorithme prédéterminé par rapport aux images bidimensionnelles divisées.
PCT/KR2020/011765 2019-09-03 2020-09-02 Procédé de génération d'image tridimensionnelle pour hmd à partir d'une image bidimensionnelle Ceased WO2021045500A1 (fr)

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KR10-2019-0108979 2019-09-03
KR1020190108979A KR20210027918A (ko) 2019-09-03 2019-09-03 2차원 이미지로부터 hmd를 위한 3차원 이미지를 생성하는 방법

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2024255182A1 (fr) * 2023-06-14 2024-12-19 维坤智能科技（上海）有限公司 Procédé, appareil et dispositif de génération d'image tridimensionnelle basés sur une image panoramique, et support de stockage

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JP2011135459A (ja) * 2009-12-25 2011-07-07 Sony Corp 画像処理装置および方法、並びにプログラム
KR20160036985A (ko) * 2014-09-26 2016-04-05 삼성전자주식회사 3d 파노라마 이미지 생성을 위한 영상 생성 장치 및 방법
KR20160136831A (ko) * 2015-05-21 2016-11-30 삼성전자주식회사 다시점 영상 디스플레이 장치 및 그 제어 방법
WO2018052100A1 (fr) * 2016-09-15 2018-03-22 株式会社カヤック Dispositif, procédé et programme de traitement d'images
KR20190055228A (ko) * 2016-09-30 2019-05-22 인터디지털 브이씨 홀딩스 인코포레이티드 전방향 이미지들의 맵핑의 표시를 제공하는 방법들, 디바이스들 및 스트림

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Publication number Priority date Publication date Assignee Title
JP2011135459A (ja) * 2009-12-25 2011-07-07 Sony Corp 画像処理装置および方法、並びにプログラム
KR20160036985A (ko) * 2014-09-26 2016-04-05 삼성전자주식회사 3d 파노라마 이미지 생성을 위한 영상 생성 장치 및 방법
KR20160136831A (ko) * 2015-05-21 2016-11-30 삼성전자주식회사 다시점 영상 디스플레이 장치 및 그 제어 방법
WO2018052100A1 (fr) * 2016-09-15 2018-03-22 株式会社カヤック Dispositif, procédé et programme de traitement d'images
KR20190055228A (ko) * 2016-09-30 2019-05-22 인터디지털 브이씨 홀딩스 인코포레이티드 전방향 이미지들의 맵핑의 표시를 제공하는 방법들, 디바이스들 및 스트림

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024255182A1 (fr) * 2023-06-14 2024-12-19 维坤智能科技（上海）有限公司 Procédé, appareil et dispositif de génération d'image tridimensionnelle basés sur une image panoramique, et support de stockage

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