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Conveying the 3D shape of smoothly curving transparent surfaces via texture

机译:通过纹理传达平滑弯曲透明表面的3D形状

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Transparency can be a useful device for depicting multiple overlapping surfaces in a single image. The challenge is to render the transparent surfaces in such a way that their 3D shape can be readily understood and their depth distance from underlying structures clearly perceived. This paper describes our investigations into the use of sparsely-distributed discrete, opaque texture as an artistic device for more explicitly indicating the relative depth of a transparent surface and for communicating the essential features of its 3D shape in an intuitively meaningful and minimally occluding way. The driving application for this work is the visualization of layered surfaces in radiation therapy treatment planning data, and the technique is illustrated on transparent isointensity surfaces of radiation dose. We describe the perceptual motivation and artistic inspiration for defining a stroke texture that is locally oriented in the direction of greatest normal curvature (and in which individual strokes are of a length proportional to the magnitude of the curvature in the direction they indicate), and we discuss two alternative methods for applying this texture to isointensity surfaces defined in a volume. We propose an experimental paradigm for objectively measuring observers' ability to judge the shape and depth of a layered transparent surface, in the course of a task which is relevant to the needs of radiotherapy treatment planning, and use this paradigm to evaluate the practical effectiveness of our approach through a controlled observer experiment based on images generated from actual clinical data.
机译:透明度可能是用于在单个图像中描绘多个重叠表面的有用设备。挑战在于以一种易于理解其3D形状并清楚地感知其与基础结构的深度距离的方式来渲染透明表面。本文介绍了我们对稀疏分布的离散,不透明纹理作为艺术设备的使用的调查,以更直观地指示透明表面的相对深度并以直观,有意义且最小限度的方式传达其3D形状的基本特征。这项工作的驱动应用是放射治疗治疗计划数据中分层表面的可视化,并且该技术在辐射剂量的透明等强度表面上进行了说明。我们描述了用于定义笔触纹理的感知动机和艺术灵感,该笔触纹理在最大法向曲率的方向上局部定位(并且各个笔触的长度与所指示方向上的曲率大小成正比),讨论了将这种纹理应用于体积中定义的等强度表面的两种替代方法。我们提出了一种实验范式,用于在与放射疗法治疗计划需求相关的任务过程中,客观地测量观察者判断透明透明表面的形状和深度的能力,并使用该范式来评估我们的方法是通过根据实际临床数据生成的图像进行受控的观察者实验。

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