Diffusion curves image (DCI) is a kind of vector graphics with its geometric primitives defined by a set of Bézier curves. As one of the vector graphics, editability is an important property for diffusion curves. However, most of the current DCI shape manipulation methods are typically limited to single curve. It is tedious for users to edit the shape of DCI by deforming each curve individually, especially with the increasing number of curves. In addition, the image contents cannot well preserved because there is no constraints among curves. We present an efficient and flexible DCI manipulation method by combining global and local deformations. The overall shape is easily changed by our global manipulation tool with a few user interactions, while the local manipulation tool is used to modify details. These two tools can be combined to obtain desired effects. In both cases, the constraints during deformation preserve the quality of the editing results. Our experimental results demonstrate that the proposed method provides more convenient control for DCI shape editing than existing techniques based on diffusion curves.

中文翻译：

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扩散曲线图像的形状处理

扩散曲线图像（DCI）是一种矢量图形，其几何图元由一组贝塞尔曲线定义。作为矢量图形之一，可编辑性是扩散曲线的重要属性。然而，大多数当前的 DCI 形状操作方法通常仅限于单曲线。用户通过单独变形每条曲线来编辑 DCI 的形状很繁琐，尤其是随着曲线数量的增加。此外，由于曲线之间没有约束，无法很好地保留图像内容。我们通过结合全局和局部变形提出了一种有效且灵活的 DCI 操作方法。我们的全局操作工具可以通过一些用户交互轻松更改整体形状，而本地操作工具则用于修改细节。这两个工具可以结合使用以获得所需的效果。在这两种情况下，变形期间的约束都会保持编辑结果的质量。我们的实验结果表明，与现有的基于扩散曲线的技术相比，所提出的方法为 DCI 形状编辑提供了更方便的控制。