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    Apparatus and method for estimating focal length of camera
    1.
    发明授权
    Apparatus and method for estimating focal length of camera 有权
    用于估计摄像机焦距的装置和方法

    公开(公告)号：US08238648B2

    公开(公告)日：2012-08-07

    申请号：US11945759

    申请日：2007-11-27

    申请人： Jae Chul Kim ,  Chang Woo Chu ,  Ho Won Kim ,  Jeung Chul Park ,  Ji Young Park ,  Seong Jae Lim ,  Bon Ki Koo

    发明人： Jae Chul Kim ,  Chang Woo Chu ,  Ho Won Kim ,  Jeung Chul Park ,  Ji Young Park ,  Seong Jae Lim ,  Bon Ki Koo

    IPC分类号： G06K9/00

    CPC分类号： G03B17/18 ,  G03B35/00 ,  G06T7/80 ,  H04N13/246

    摘要： Provided is a camera self-calibration method that calculates a focal length of a fixed zoom lens camera from a correspondence point position between images. In the method, a cost function, which is a function of a focal length, is defined, and a focal length that minimizes the defined cost function is obtained to obtain a focal length that allows 3D recovery results of correspondence points calculated from all image pairs coincide with one another. Therefore, reliability of the calculated focal length can be easily verified, and the focal length of the camera can be stably calculated even when the position of input correspondence point is inaccurately given.

    摘要翻译： 提供了一种从图像之间的对应点位置计算固定变焦镜头相机的焦距的照相机自校准方法。 在该方法中，定义作为焦距的函数的成本函数，并且获得使定义的成本函数最小化的焦距，以获得允许从所有图像对计算的对应点的3D恢复结果的焦距 相互重合。 因此，即使在输入对应点的位置不准确的情况下，也可以容易地验证计算出的焦距的可靠性，并能够稳定地计算摄像机的焦距。

    Method for tracking head motion for 3D facial model animation from video stream
    3.
    发明申请
    Method for tracking head motion for 3D facial model animation from video stream 审中-公开
    用于从视频流追踪3D面部模型动画的头部运动的方法

    公开(公告)号：US20090153569A1

    公开(公告)日：2009-06-18

    申请号：US12314859

    申请日：2008-12-17

    申请人： Jeung Chul Park ,  Seong Jae Lim ,  Chang Woo Chu ,  Ho Won Kim ,  Ji Young Park ,  Bon Ki Koo

    发明人： Jeung Chul Park ,  Seong Jae Lim ,  Chang Woo Chu ,  Ho Won Kim ,  Ji Young Park ,  Bon Ki Koo

    IPC分类号： G06T15/70 ,  G06K9/00

    CPC分类号： G06T13/40 ,  G06K2009/3291 ,  G06T7/251 ,  G06T7/277 ,  G06T2207/10016 ,  G06T2207/30201

    摘要： A head motion tracking method for three-dimensional facial model animation, the head motion tracking method includes acquiring initial facial motion to be fit to an image of a three-dimensional model from an image inputted by a video camera; creating a silhouette of the three-dimensional model and projecting the silhouette; matching the silhouette created from the three-dimensional model with a silhouette acquired by a statistical feature point tracking scheme; and obtaining a motion parameter for the image of the three-dimensional model through motion correction using a texture to perform three-dimensional head motion tracking. In accordance with the present invention, natural three-dimensional facial model animation based on a real image acquired with a video camera can be performed automatically, thereby reducing time and cost.

    摘要翻译： 一种用于三维面部模型动画的头部运动跟踪方法，所述头部运动跟踪方法包括从由摄像机输入的图像获取拟合到三维模型的图像的初始面部运动; 创建三维模型的轮廓并投影轮廓; 将由三维模型创建的轮廓与通过统计特征点跟踪方案获取的轮廓相匹配; 并且通过使用纹理的运动校正来获得三维模型的图像的运动参数，以执行三维头部运动跟踪。 根据本发明，可以自动执行基于用摄像机获取的真实图像的自然三维面部模型动画，从而减少时间和成本。

    MULTI-VIEW CAMERA COLOR CALIBRATION METHOD USING COLOR CHECKER CHART
    4.
    发明申请
    MULTI-VIEW CAMERA COLOR CALIBRATION METHOD USING COLOR CHECKER CHART 审中-公开
    多色摄像机彩色校正方法使用颜色检查器图

    公开(公告)号：US20090153745A1

    公开(公告)日：2009-06-18

    申请号：US12334095

    申请日：2008-12-12

    申请人： Ji Young Park ,  Chang Woo Chu ,  Ho Won Kim ,  Seong Jae Lim ,  Jeung Chul Park ,  Bon Ki Koo

    发明人： Ji Young Park ,  Chang Woo Chu ,  Ho Won Kim ,  Seong Jae Lim ,  Jeung Chul Park ,  Bon Ki Koo

    IPC分类号： H04N9/68

    CPC分类号： H04N17/02 ,  G06T7/80 ,  H04N13/133 ,  H04N13/239 ,  H04N13/243 ,  H04N13/246 ,  H04N13/25 ,  H04N13/257 ,  H04N17/002

    摘要： A multi-view camera color calibration method using a color checker chart, includes measuring a brightness range of photographic data being input from multiple cameras; photographing the color checker chart for each camera and adjusting a brightness value of the chart to be within the brightness range of an input image of each camera; correcting brightness of each camera by using a gray patch of the checker chart; modeling a relationship between a color value of the checker chart obtained by each camera and a standard color value provided by the color checker chart; and correcting differences in color as a result of the modeling, to calibrate colors among the multiple cameras. Therefore, the three-dimensional information of a moving object for photography which cannot be photographed by moving only one camera is capable of being restored.

    摘要翻译： 使用颜色检查图的多视点相机颜色校准方法包括测量从多个相机输入的照片数据的亮度范围; 拍摄每个相机的颜色检查图，并将图表的亮度值调整在每个相机的输入图像的亮度范围内; 通过使用格子图的灰色补丁校正每个相机的亮度; 建模由每个相机获得的检查图的颜色值与由颜色检查图提供的标准颜色值之间的关系; 并且通过建模来校正颜色差异，以校准多个相机之间的颜色。 因此，能够恢复不能通过仅移动一个照相机而拍摄的摄影用移动物体的三维信息。

    Method and apparatus for accuracy measuring of 3D graphical model using images
    5.
    发明申请
    Method and apparatus for accuracy measuring of 3D graphical model using images 审中-公开
    使用图像对3D图形模型进行精度测量的方法和装置

    公开(公告)号：US20090153673A1

    公开(公告)日：2009-06-18

    申请号：US12314855

    申请日：2008-12-17

    申请人： Chang Woo Chu ,  Seong Jae Lim ,  Ho Won Kim ,  Jeung Chul Park ,  Ji Young Park ,  Bon Ki Koo

    发明人： Chang Woo Chu ,  Seong Jae Lim ,  Ho Won Kim ,  Jeung Chul Park ,  Ji Young Park ,  Bon Ki Koo

    IPC分类号： H04N5/225 ,  G06T17/00

    CPC分类号： G06T7/001 ,  G06T15/00

    摘要： Disclosed is a technology for measuring a degree of accuracy of a 3D graphical model by using images. The technology includes creating camera parameters by calculating a position, a direction, and intrinsic parameters of a camera through a calibration of the camera to a reference image which is photographed for reference during creation of the 3D graphical model of an actually existing object; calculating a position and a direction of the 3D graphical model based on a corresponding relation between the reference image and 3D graphical model data obtained by digitizing the actually existing object; creating a synthesized image by rendering the 3D graphical model using the camera parameters; extracting characteristics of the reference image and the synthesized image; and calculating distance and length errors based on a corresponding relation between the extracted characteristics of the two images.

    摘要翻译： 公开了一种通过使用图像来测量3D图形模型的精度的技术。 该技术包括通过将照相机的校准计算到相机的位置，方向和固有参数来创建相机参数，以参考图像，该参考图像在实际存在的对象的3D图形模型的创建期间被拍照以供参考; 基于通过数字化实际存在的对象获得的参考图像和3D图形模型数据之间的对应关系来计算3D图形模型的位置和方向; 通过使用相机参数渲染3D图形模型来创建合成图像; 提取参考图像和合成图像的特征; 并且基于提取的两个图像的特征之间的对应关系来计算距离和长度误差。

    Method and system for producing 3D facial animation
    6.
    发明申请
    Method and system for producing 3D facial animation 有权
    制作3D面部动画的方法和系统

    公开(公告)号：US20090153554A1

    公开(公告)日：2009-06-18

    申请号：US12314785

    申请日：2008-12-16

    申请人： Seong Jae Lim ,  Jeung Chul Park ,  Chang Woo Chu ,  Ho Won Kim ,  Ji Young Park ,  Bon Ki Koo

    发明人： Seong Jae Lim ,  Jeung Chul Park ,  Chang Woo Chu ,  Ho Won Kim ,  Ji Young Park ,  Bon Ki Koo

    IPC分类号： G06T15/70

    CPC分类号： G06T13/40

    摘要： A method for producing a 3D facial animation using a single facial video stream, includes producing a representative joint focused on a major expression producing element in a 3D standard facial model, producing a statistical feature-point model of various facial expressions of different people in the 3D standard facial model, moving each feature-point of the statistical feature-point model by tracking a change in facial expressions of the video stream, calculating a transformation coefficient of the representative joint corresponding to a variation of the feature-point of the 3D standard facial model, and producing a 3D facial animation by applying the calculated transformation coefficient to transform the representative joint.

    摘要翻译： 一种用于使用单个面部视频流生成3D面部动画的方法，包括：在3D标准面部模型中产生聚焦在主要表现形成元素上的代表性关节，产生不同人物的各种面部表情的统计特征点模型 3D标准面部模型，通过跟踪视频流的面部表情的变化来移动统计特征点模型的每个特征点，计算与3D标准的特征点的变化相对应的代表关节的变换系数 面部模型，并通过应用计算的变换系数来转换代表性关节来产生3D面部动画。

    Method and apparatus for creating 3D face model by using multi-view image information
    7.
    发明申请
    Method and apparatus for creating 3D face model by using multi-view image information 失效
    通过使用多视图图像信息创建3D人脸模型的方法和装置

    公开(公告)号：US20090153553A1

    公开(公告)日：2009-06-18

    申请号：US12314676

    申请日：2008-12-15

    申请人： Ho Won Kim ,  Bon Ki Koo ,  Chang Woo Chu ,  Seong Jae Lim ,  Jeung Chul Park ,  Ji Young Park

    发明人： Ho Won Kim ,  Bon Ki Koo ,  Chang Woo Chu ,  Seong Jae Lim ,  Jeung Chul Park ,  Ji Young Park

    IPC分类号： G06T15/00

    CPC分类号： G06T13/40 ,  G06T17/20

    摘要： A method for creating a 3D face model by using multi-view image information, includes: creating a mesh structure for expressing an appearance of a 3D face model by using a first multi-view image obtained by capturing an expressionless face of a performer; and locating joints of a hierarchical structure in the mesh structure, by using a second multi-view image obtained by capturing an expression performance of the performer. Further, the method includes creating a 3D face model that is animated to enable reproduction of a natural expression of the performer, by setting dependency between the joints and the mesh structure.

    摘要翻译： 一种通过使用多视点图像信息来创建3D人脸模型的方法，包括：通过使用通过捕获表演者的无表情脸部获得的第一多视角图像来创建用于表达3D面部模型的外观的网格结构; 以及通过使用通过捕获表演者的表情表现而获得的第二多视图图像，将网格结构中的分层结构的关节定位。 此外，该方法包括通过设置关节和网格结构之间的依赖关系来创建动画的3D面部模型以使再现执行者的自然表达。

    Method and system for producing 3D facial animation
    9.
    发明授权
    Method and system for producing 3D facial animation 有权
    制作3D面部动画的方法和系统

    公开(公告)号：US08259102B2

    公开(公告)日：2012-09-04

    申请号：US12314785

    申请日：2008-12-16

    申请人： Seong Jae Lim ,  Jeung Chul Park ,  Chang Woo Chu ,  Ho Won Kim ,  Ji Young Park ,  Bon Ki Koo

    发明人： Seong Jae Lim ,  Jeung Chul Park ,  Chang Woo Chu ,  Ho Won Kim ,  Ji Young Park ,  Bon Ki Koo

    IPC分类号： G06T15/70

    CPC分类号： G06T13/40

    摘要： A method for producing a 3D facial animation using a single facial video stream, includes producing a representative joint focused on a major expression producing element in a 3D standard facial model, producing a statistical feature-point model of various facial expressions of different people in the 3D standard facial model, moving each feature-point of the statistical feature-point model by tracking a change in facial expressions of the video stream, calculating a transformation coefficient of the representative joint corresponding to a variation of the feature-point of the 3D standard facial model, and producing a 3D facial animation by applying the calculated transformation coefficient to transform the representative joint.

    摘要翻译： 一种用于使用单个面部视频流生成3D面部动画的方法，包括：在3D标准面部模型中产生聚焦在主要表现形成元素上的代表性关节，产生不同人物的各种面部表情的统计特征点模型 3D标准面部模型，通过跟踪视频流的面部表情的变化来移动统计特征点模型的每个特征点，计算与3D标准的特征点的变化相对应的代表关节的变换系数 面部模型，并通过应用计算的变换系数来转换代表性关节来产生3D面部动画。