EP2556660A1 - Verfahren zur echtzeit-beschneidung einer in einer videosequenz aufgenommenen realen einheit - Google Patents

Verfahren zur echtzeit-beschneidung einer in einer videosequenz aufgenommenen realen einheit

Info

Publication number
EP2556660A1
EP2556660A1 EP11718446A EP11718446A EP2556660A1 EP 2556660 A1 EP2556660 A1 EP 2556660A1 EP 11718446 A EP11718446 A EP 11718446A EP 11718446 A EP11718446 A EP 11718446A EP 2556660 A1 EP2556660 A1 EP 2556660A1
Authority
EP
European Patent Office
Prior art keywords
image
user
avatar
entity
real
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP11718446A
Other languages
English (en)
French (fr)
Inventor
Brice Leclerc
Olivier Marce
Yann Leprovost
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent SAS
Original Assignee
Alcatel Lucent SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Lucent SAS filed Critical Alcatel Lucent SAS
Publication of EP2556660A1 publication Critical patent/EP2556660A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/60—Editing figures and text; Combining figures or text
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T19/00—Manipulating 3D models or images for computer graphics
    • G06T19/20—Editing of 3D images, e.g. changing shapes or colours, aligning objects or positioning parts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/272—Means for inserting a foreground image in a background image, i.e. inlay, outlay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/272—Means for inserting a foreground image in a background image, i.e. inlay, outlay
    • H04N2005/2726—Means for inserting a foreground image in a background image, i.e. inlay, outlay for simulating a person's appearance, e.g. hair style, glasses, clothes

Definitions

  • An aspect of the invention relates to a method of real-time clipping of a real entity recorded in a video sequence, and more particularly the clipping in real time of a part of the body of a user in a video sequence using the corresponding body part of an avatar.
  • Such a method finds a particular and non-exclusive application in the field of virtual reality, in particular the animation of an avatar in an environment called virtual or said mixed reality.
  • FIG 1 shows an example of virtual reality application in the context of a multimedia system, for example videoconferencing or online games.
  • the multimedia system 1 comprises several multimedia devices 3, 12, 14, 16 connected to a telecommunications network 9 enabling the transmission of data and a remote application server 10.
  • the users 2, 11, 13 Respective multimedia devices 3, 12, 14, 16 can interact in a virtual environment or a mixed reality environment (shown in Figure 2).
  • the remote application server 10 can manage the virtual or mixed reality environment 20.
  • the multimedia device 3 comprises a processor 4, a memory 5, a connection module 6 to the telecommunications network 9, display means and interaction 7, and a camera 8 for example a webcam.
  • the other multimedia devices 12, 14, 16 are equivalent to the multimedia device 3 and will not be described in more detail.
  • FIG. 2 illustrates a virtual or mixed reality environment in which an avatar 21 evolves.
  • the virtual or mixed reality environment 20 is a graphical representation imitating a world in which the users 2, 11, 13, 15 can evolve, interact, and / or collaborate, etc.
  • each user 2, 11, 13, 16 is represented by his avatar 21, that is to say a representation virtual graphic of a human being.
  • dynamics or in real time is meant to reproduce the movements, postures, real appearances of the head of the user 2, 11, 13 or 15 in front of his multimedia device 3, 12, 14, 16 in a synchronous manner. or quasi-synchronously on the head 22 of the avatar 21.
  • a video is understood to mean a visual or audiovisual sequence comprising a succession of images.
  • US 2009/202114 discloses a computer implemented video capture method comprising identifying and tracking a face in a plurality of video frames in real time on a first computing device, the generation of data representative of the face identified and continued, and the transmission of the face data to a second computing device via a network for displaying the face on an avatar body by the second computing device.
  • contour recognition algorithms require a well-contrasted video image. This can be done in the studio with ad hoc lighting. On the other hand, this is not always possible with a Webcam-type camera and / or in the bright environment of a room in a residential or office building.
  • contour recognition algorithms require a high computing power on the part of the processor. In general, such computing power is not currently available on standard multimedia devices such as personal computers, laptops, PDAs (Personal Digital Assistant PDAs) or smart phones ( from the English "smartphone").
  • the method comprises the steps of:
  • the method may further comprise a step of merging the body part of the avatar with the cut-out image.
  • the real entity may be a part of a user's body
  • the virtual entity may be the part of the corresponding body of an avatar intended to reproduce an appearance. of the body part of the user, the method includes the steps:
  • the step of determining the orientation and / or scale of the image comprising the body part of the recorded user can be performed by a head tracking function applied to said image.
  • the steps of orientation and scaling, contour extraction, and merger can take into account points or areas of the remarkable part of the body of the avatar or the user.
  • the body part of the avatar can be a three-dimensional representation of said part of the body of the avatar.
  • the clipping method may further include an initialization step of shaping the three-dimensional representation of the body part of the body. the avatar according to the body part of the user whose appearance is to be reproduced.
  • the body part can be the head of the user or the avatar.
  • the invention relates to a multimedia system comprising a processor implementing the clipping method according to the invention.
  • the invention relates to a computer program product intended to be loaded into a memory of a multimedia system, the computer program product comprising portions of software code implementing the method. according to the invention when the program is executed by a processor of the multimedia system.
  • the invention makes it possible effectively to detach zones representing an entity in a video sequence.
  • the invention also allows to merge in real time an avatar and a video sequence with sufficient quality to provide a sense of immersion in a virtual environment.
  • the method of the invention consumes few resources of the processor and uses functions generally encoded in graphics cards. It can therefore be implemented with standard multimedia devices such as personal computers, laptops, PDAs or smart phones. It can use images with low contrast or with faults from webcam type camera.
  • Figure 1 represents a virtual reality application in the context of a multimedia videoconferencing system or online games
  • Figure 2 illustrates a virtual or mixed reality environment in which an avatar evolves
  • FIGS. 3A and 3B are a block diagram illustrating an embodiment of the method of real-time clipping of a user's head recorded in a video sequence according to the invention.
  • FIGS. 4A and 4B are a block diagram illustrating another embodiment of the method of real-time clipping of a user's head recorded in a video sequence according to the invention.
  • Figures 3A and 3B are a block diagram illustrating an embodiment of the real-time clipping method of a user's head recorded in a video sequence.
  • a first step S1 at a given instant an image 31 is extracted EXTR of the video sequence 30 of the user.
  • a video sequence is understood to mean a succession of images recorded for example by the camera (see FIG. 1).
  • a HTFunc head tracking function is applied to the extracted image 31.
  • the head tracking function is used to determine the scale E and the orientation O of the user's head. It uses the remarkable position of certain points or areas of the face 32, for example the eyes, the eyebrows, the nose, the cheeks, the chin.
  • Such a head tracking function can be implemented by the software application "faceAPI" marketed by Seeing Machines.
  • a three-dimensional avatar head 33 is oriented ORI and scaled ECH in a manner substantially identical to that of the head of the extracted image based on the O orientation and the determined £ scale.
  • the result is a three-dimensional avatar head 34 of size and orientation consistent with the image of the extracted head 31.
  • This step uses standard rotation and scaling algorithms.
  • a fourth step S4 the head of the three-dimensional avatar 34 of size and orientation according to the image of the extracted head is POSI positioned as the head in the extracted image 31. It is in results in identical positioning Of the two heads with respect to the image.
  • This step uses standard translation functions, translations taking into account points or remarkable areas of the face, such as the eyes, eyebrows, nose, cheeks, and / or chin as well as the remarkable points coded for the head. 'avatar.
  • a fifth step S5 the head of the positioned three-dimensional avatar 35 is projected PROJ on a plane.
  • a projection function on a standard plane for example a transformation matrix can be used.
  • only the pixels of the extracted image 31 located within the contour 36 of the head of the projected three-dimensional avatar are selected PIX SEL and preserved.
  • a standard AND function can be used. This selection of pixels form a clipped head image 37, which is a function of the projected head of the avatar and the image resulting from the video sequence at the given moment.
  • the clipped head image 37 can be positioned, applied and substituted SUB to the head 22 of the avatar 21 evolving in the virtual environment or mixed reality 20.
  • the avatar present in the virtual environment or mixed reality environment the actual head of the user in front of his multimedia device substantially at the same given instant.
  • the detoured head image is placed on the head of the avatar, the elements of the avatar, for example the hair, are covered by the cut-out head image 37.
  • step S6 may be considered optional when the clipping method is used to filter a video sequence and extract only the face of the user. In this case, no image of a virtual environment or mixed reality is displayed.
  • Figures 4A and 4B are a block diagram illustrating another embodiment of the real-time clipping method of a user's head recorded in a video sequence.
  • the area of the avatar head 22 corresponding to the face is specifically encoded in the three-dimensional avatar head model. This may be for example the absence of the corresponding pixels or transparent pixels.
  • a first step S1A at a given instant an image 31 is extracted EXTR of the video sequence 30 of the user.
  • an HTFunc head tracking function is applied to the extracted image 31.
  • the head tracking function is used to determine the orientation O of the user's head. It uses the remarkable position of certain points or areas of the face 32, for example the eyes, the eyebrows, the nose, the cheeks, the chin.
  • Such a head tracking function can be implemented by the software application "faceAPI" marketed by Seeing Machines.
  • a third step S3A the virtual environment or mixed reality 20 in which the avatar 21 evolves is calculated and a three-dimensional avatar head 33 is oriented ORI in a manner substantially identical to that of the head of the extracted image based on the determined orientation O. This results in a three-dimensional avatar head 34A oriented according to the image of the extracted head 31.
  • This step uses a standard rotation algorithm.
  • a fourth step S4A the image 31 extracted from the video sequence is positioned POSI and scaled ECH as the head of the three-dimensional avatar 34A in the virtual environment or mixed reality 20. This results in an alignment of the image extracted from the video sequence 38 and the head of the avatar in the virtual or mixed reality environment 20.
  • This step uses standard translation functions, the translations taking into account noticeable points or areas of the face, such as the eyes, eyebrows, nose, cheeks, and / or chin, and the notable points coded for the avatar head.
  • a fifth step S5A the image of the virtual environment or mixed reality 20 in which the avatar 21 evolves is drawn taking care not to draw the pixels that are behind the area of the head of the avatar 22 corresponding to the oriented face, these pixels being easily identifiable thanks to the specific coding of the area of the head of the avatar 22 corresponding to the face and by a simple projection.
  • a sixth step S6A the image of the virtual environment or of mixed reality 20 and the image extracted from the video sequence comprising the head of the user translated and scaled 38 are superimposed SUP.
  • the pixels of the image extracted from the video sequence comprising the user's head translated and scaled behind the area of the head of the avatar 22 corresponding to the Oriented faces are embedded in the virtual image at the depth of the deepest pixels of the avatar's facing face.
  • the avatar presents in the virtual environment or the mixed reality environment the real face of the user in front of his multimedia device substantially at the same given instant.
  • the image of the virtual environment or mixed reality 20 having the face of the cut-out avatar is superimposed on the image of the user's head translated and scaled 38, the elements of the avatar, for example the hair, are visible and covers the image of the user.
  • the three-dimensional avatar head 33 is derived from a three-dimensional numerical model. It is quick and easy to calculate regardless of the orientation and size of the three-dimensional avatar head for standard multimedia devices. It's the same for its projection on a plane. Thus, the whole sequence gives a qualitative result even with a standard processor.
  • an initialization step (not shown) can be performed only once before the implementation of the sequences S1 to S6 or S1A to S6A.
  • a three-dimensional avatar head is modeled according to the user's head. This step can be done manually or automatically from an image or multiple images of the user's head taken from different angles. This step makes it possible to precisely distinguish the silhouette of the three-dimensional avatar head that will be most suitable for the real-time clipping method according to the invention.
  • the adaptation of the avatar to the head of the user on the basis of a photo can be achieved through a software application such as for example "FaceShop" marketed by Abalone.
  • the invention has just been described in connection with a particular example of mixing between an avatar head and a user's head. Nevertheless, it is obvious to one skilled in the art that the invention can be extended to other parts of the body, for example any member, or a more precise part of the face such as the mouth, etc. It is also applicable to body parts of animals, or objects, or elements of a landscape, etc.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Computer Graphics (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Bioinformatics & Computational Biology (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Artificial Intelligence (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Evolutionary Computation (AREA)
  • Data Mining & Analysis (AREA)
  • Evolutionary Biology (AREA)
  • Processing Or Creating Images (AREA)
  • Television Signal Processing For Recording (AREA)
EP11718446A 2010-04-06 2011-04-01 Verfahren zur echtzeit-beschneidung einer in einer videosequenz aufgenommenen realen einheit Withdrawn EP2556660A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1052567A FR2958487A1 (fr) 2010-04-06 2010-04-06 Une methode de detourage en temps reel d'une entite reelle enregistree dans une sequence video
PCT/FR2011/050734 WO2011124830A1 (fr) 2010-04-06 2011-04-01 Une methode de detourage en temps reel d'une entite reelle enregistree dans une sequence video

Publications (1)

Publication Number Publication Date
EP2556660A1 true EP2556660A1 (de) 2013-02-13

Family

ID=42670525

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Application Number Title Priority Date Filing Date
EP11718446A Withdrawn EP2556660A1 (de) 2010-04-06 2011-04-01 Verfahren zur echtzeit-beschneidung einer in einer videosequenz aufgenommenen realen einheit

Country Status (7)

Country Link
US (1) US20130101164A1 (de)
EP (1) EP2556660A1 (de)
JP (1) JP2013524357A (de)
KR (1) KR20130016318A (de)
CN (1) CN102859991A (de)
FR (1) FR2958487A1 (de)
WO (1) WO2011124830A1 (de)

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Also Published As

Publication number Publication date
CN102859991A (zh) 2013-01-02
KR20130016318A (ko) 2013-02-14
FR2958487A1 (fr) 2011-10-07
WO2011124830A1 (fr) 2011-10-13
US20130101164A1 (en) 2013-04-25
JP2013524357A (ja) 2013-06-17

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