Skeleton-Based Parametric 2-D Region Representation: Disk B-Spline Curves

Wu, Zhang; Wang, Xingce; Liu, Shaolong; Chen, Quan; Seah, Hock Soon; Tian, Feng

doi:10.1109/mcg.2021.3069847

Cited by 5 publications

(3 citation statements)

References 16 publications

(14 reference statements)

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“…In the future, we would like to extend our occlusion representation to allow varying depth along strokes rather than uniform depth. One approach is to represent curves using Disk B‐Spline Curve [WWL*21], which can interpolate attributes smoothly along a curve. In addition, we would like to improve the user interaction in boundary stroke definition.…”

Section: Discussionmentioning

confidence: 99%

Stroke‐Based Drawing and Inbetweening with Boundary Strokes

Jiang

Seah

Liew³

2021

Computer Graphics Forum

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In conventional 2D drawing systems, a drawing usually consists of multiple layers and is composited by rendering layers from back to front. A shape in a higher layer occludes contents in lower layers. However, shapes must have boundaries that form closed regions for occlusion. This limitation causes problems in occlusion resolution. We therefore propose a method to allow users to specify and resolve occlusion in stroke‐based drawing with boundary strokes. Rather than defining shapes, we introduce boundary strokes, which are strokes with occluding sides that work as occluding surfaces. We further introduce a series of user interactions, such as grouping, linking and inverting, on the boundary strokes to realize different occlusion effects. Geometry is then used to find the regions of occluding surfaces to resolve occlusion. The drawings are ready to be coloured, if needed. We extend our method to resolve occlusion in 2D stroke‐based inbetweening. We demonstrate the effectiveness of our method by applying it to resolve occlusion in single drawings and 2D stroke‐based inbetweening.

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Section: Discussionmentioning

confidence: 99%

Stroke‐Based Drawing and Inbetweening with Boundary Strokes

Jiang

Seah

Liew³

2021

Computer Graphics Forum

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“…Raster image representation is resolution-dependent, which results in large amount of data and is not editable. Image from [Wu21a].…”

Section: Related Workmentioning

confidence: 99%

“…Such stroke is resolution-independent and can be scaled without losing image quality. An example is the Disk B-Spline Curve (DBSC) [Sea05a,Wu21a], which enables varying thickness on a B-Spline curve by storing a radius parameter at each control point. For example, in Fig 1, each stroke in the Chinese calligraphy, painting, and portrait can be represented by a single DBSC.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Rendering with eXpressive B-Spline Curves

Seah¹,

Tandianus²,

Sui³

2023

Computer Science Research Notes

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eXpressive B-Spline Curve (XBSC) is a resolution-independent and computationally efficient technique for vector-based stroke modeling and rendering with the flexibility in defining and adjusting the shape and other parameters of the stroke. It generalizes the existing Disk B-Spline Curve (DBSC) geometric representation, which itself is a generalization of the Disk Bézier curve. XBSC allows flexible shape and color manipulation and rendering of strokes with asymmetrical shape control and rich color management. These properties make XBSC suitable for modeling freeform stroke shapes and animation, specifically in squash and stretch, a common technique to bestow elasticity and flexibility in shape changes. During the squash and stretch animation computation, we constrain the shape of the XBSC stroke to conserve its area. To achieve this, we apply the simulated annealing algorithm to iteratively adjust the XBSC while maintaining its area. We show several drawings, rendering and deformation examples to demonstrate the robustness of XBSC.

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