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    • 5. 发明授权
    • Volume warping for adaptive isosurface extraction
    • 适应性等值面提取的体积翘曲
    • US07623992B2
    • 2009-11-24
    • US10408813
    • 2003-03-28
    • Laurent L. BalmelliFausto BernardiniChristopher J. MorrisGabriel Taubin
    • Laurent L. BalmelliFausto BernardiniChristopher J. MorrisGabriel Taubin
    • G06F17/10G06T17/00
    • G06T17/205G06T17/20
    • Methods and apparatus solving problems of polygonal approximations of isosurfaces extracted from uniformly sampled volumes increasing in size due to the availability of higher resolution imaging techniques. The large number of primitives represented hinders the interactive exploration of the dataset. Examples of methods are provided for adaptive isosurface extraction that are generally easy to implement and allows the user to decide the degree of adaptivity as well as the choice of isosurface extraction algorithm. The extraction of the isosurface is optimized by warping the volume. In a warped volume, areas of importance (e.g. containing significant details) are inflated while unimportant ones are contracted. Once the volume is warped, any extraction algorithm can be applied. The extracted mesh is subsequently unwarped such that the warped areas are rescaled to their initial proportions. The resulting isosurface is represented by a mesh that is more densely sampled in regions decided as important.
    • 方法和装置解决由于更高分辨率成像技术的可用性而从均匀采样体积提高的等值面的多边形逼近的问题。 代表的大量原语阻碍了数据集的交互式探索。 提供了通常易于实现的自适应等值面提取的方法的示例,并且允许用户决定自适应度以及等面提取算法的选择。 通过扭曲体积来优化等值面的提取。 在扭曲的数量中,重要的领域(例如包含重要的细节)被膨胀,而不重要的领域是合同的。 一旦音量变形,就可以应用任何提取算法。 提取的网格随后被取代,使得翘曲区域被重新缩放到其初始比例。 所得到的等值面由在被确定为重要的区域中更密集地采样的网格表示。
    • 8. 发明授权
    • System, method, and program product for acquiring accurate object silhouettes for shape recovery
    • 用于获取形状恢复的准确对象轮廓的系统,方法和程序产品
    • US06455835B1
    • 2002-09-24
    • US09825685
    • 2001-04-04
    • Fausto BernardiniHenning BiermannHolly E. RushmeierSilvio SavareseGabriel Taubin
    • Fausto BernardiniHenning BiermannHolly E. RushmeierSilvio SavareseGabriel Taubin
    • H01L2700
    • G01B11/2433G06T7/564
    • Disclosed are methods and apparatus for obtaining the shape of an object by observing silhouettes of the object. At least one point light source is placed in front of the object, thereby casting a shadow of the object on a translucent panel that is placed behind the object. A camera, or other imaging device, captures an image of the shadow from behind the translucent panel. The object's full silhouette is obtained from the image of the shadow as the region of the shadow is substantially darker than the region outside of the shadow. The full silhouette thus obtained may be processed by any suitable shape from silhouette algorithm, and thus objects are not limited in topological type. A color image of the object can optionally be obtained simultaneously with the shadow image using a camera placed on the same side of the object as the light source. Multiple silhouettes can be captured for one object position, reducing the number of rotations needed on a turntable system, and reducing the post-processing needed to register geometries obtained from multiple different positions.
    • 公开了通过观察物体的轮廓来获得物体的形状的方法和装置。 至少一个点光源被放置在物体的前面,从而将物体的阴影投射在放置在物体后面的半透明面板上。 相机或其他成像设备从半透明面板后面捕获阴影的图像。 当阴影的区域比阴影之外的区域更暗时,物体的完整轮廓可以从阴影的图像中获得。 由此获得的完整轮廓可以通过剪影算法的任何合适的形状进行处理,因此对象不限于拓扑类型。 可以使用放置在与光源相同的对象侧的照相机与阴影图像同时地获得对象的彩色图像。 可以为一个对象位置捕获多个剪影,减少转盘系统上所需的旋转数量,并减少从多个不同位置获取的对几何进行注册所需的后处理。