Continuous Line Drawings on Dendrites
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CONTINUOUS LINE DRAWINGS ON DENDRITES Hua Li and David Mould ARTECH 2012
description
Hua Li and David Mould ARTECH 2012. Continuous Line Drawings on Dendrites. A sketching technique The pen will never leave the paper until the picture is finished. Constraints: a single closed curve no self-intersection preserving key features (tone and structure). - PowerPoint PPT Presentation
Transcript of Continuous Line Drawings on Dendrites
CONTINUOUS LINE DRAWINGS ON DENDRITES
Hua Li and David Mould
ARTECH 2012
CONTINUOUS LINE DRAWINGS A sketching technique
The pen will never leave the paper until the picture is finished.
Constraints: a single closed curve no self-intersection preserving key features (tone and
structure)
RELATED WORK Approaches to Traveling Salesman
Problem (TSP) TSP art [Kaplan and Bosch 2005]
Curve on 2D manifolds [Pedersen and Singh 2006]
Unicursal maze [Pullen 2010] CLD on meshes or 3D models [Xing et
al. 2012, Garigipati and Akleman 2012]
PREVIOUS WORK
Curve on 2D manifolds [Pedersen and Singh 2006]
Unicursal maze [Pullen 2010]
TSP art [Kaplan and Bosch 2005]
Surface covering curves [Xing et al. 2012]
Duotone surfaces [Garigipati and Akleman 2012]
A KEY OBSERVATION TO OUR ALGORITHM
A tree structure An outer boundary forming a CLD
OVERVIEW OF OUR METHOD
A given image 1. Build a dendrite 2. Label a dentrite
3. Build a wall (blue)
4. Label and build (green)
5. Generate a CLD
STEP I: GENERATING A TREE STRUCTURE
1. A starting seed 2. The second stipple
3. The first dendrite
4. The third stipple 4. The second dendrite 5. The fourth stipple and the third dendrite
STEP II: FIRST LABELING PROPAGATION
A resulting tree from step I 1. Label each branch
2. Propagate labels and find a wall
3. Add image boundary as a wall
STEP II: SECOND LABELING PROPAGATION
1. Break the wall 2. Label the broken wall and the tree
3. Propagate labels and find the CLD
EXAMPLES OF SECOND LABELLING
VARIATIONS
Dense distribution Sparse distribution and a different position
Sparse distribution and parameter variations
VARIATIONS ON STARTING SEED
POST PROCESSING BY POV-RAY
COMPARISON
TSP art [Kaplan and Bosch 2005]
Our CLDOriginal image
MORE RESULTS
Dendrites CLD Jordan map
Original image Dendrites CLD
ENHANCEMENT WITH MASK AND THICKNESS
CONCLUSIONS Propose an automatic abstraction with
CLD Our new idea can preserve structure
and tone suggestions. The CLD problem remains a very hard
problem. Automatic balance between the quality of
abstraction and the aesthetic pleasure is still an unknown issue.
THANKS!
Questions?
