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Traditional Hatching
Albrecht Dürer Leonardo da Vinci
Suggestive Hatching Mayank Singh Scott Schaefer Traditional - - PowerPoint PPT Presentation
Suggestive Hatching Mayank Singh Scott Schaefer Traditional - - PowerPoint PPT Presentation
Suggestive Hatching Mayank Singh Scott Schaefer Traditional Hatching Leonardo da Vinci Albrecht Drer Computational Hatching Wikenbach and Salesin [1994] Girshick et al. [2000] Hertzmann and Zorin [2000] Wikenbach and Salesin [1996]
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Computational Hatching
Hertzmann and Zorin [2000] Elber et al. [1998] Praun et al. [2001] Zander et al. [2004] Wikenbach and Salesin [1996] Girshick et al. [2000] Wikenbach and Salesin [1994]
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Sparse Line Drawing
Suggestive Contours DeCarlo et al. [2003] Apparent Ridges Judd et al. [2007]
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Contour & Hatching
Suggestive Hatching
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Shading Vector Field
) , , ( ) , , ( ) ( ) (
2 , 1 , , 2 , 1 , 2 , j j j k j k j k k j
p p p A p p x A N V x I
N0 View: V x N1 N2 p0 p1 p2
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Shading Vector Field
View: V N1 N0 N2 p0 p1 p2 Fj ∇I(x)
j k j k j k j j j k j
F p p p p p A N V x I
) ( ) , , ( ) ( ) (
1 , 2 , 2 2 , 1 , , ,
SLIDE 8
Shading Strokes
Dong et al. [2005] Face Edge Vertex
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Streamlines
Mebarki et al.[2005] Spencer et al. [2009]
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Seeding and Spacing of Lines
Binary Ternary Midpoint 1 2 Sqrt(2) Levels
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Seeding and Spacing of Lines
1 2
: : : :
20
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Seeding and Spacing of Lines
9 8 7 6 5 4 3 2 1 20 levels
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Seeding and Spacing of Lines
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Density of Lines
Uniform Adaptive
))) ( 1 ( ( log 2 ) 2 /( 1 : Density
2
x I w d w
d
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Intensity Ridges
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Intensity Ridges
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Intensity Thresholding
Ridge Removal
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Comparison – Ridges
Diffuse Shading Surface Ridges Surface Valleys Apparent Ridges Suggestive Contours Suggestive Highlights Principal Highlights Intensity Ridges
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Comparison – Line Drawing
Suggestive Contours Apparent Ridges Suggestive Hatching
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Suggestive Contours
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Suggestive Hatching
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Suggestive Contours
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Suggestive Hatching
SLIDE 51
Cross Hatching
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Moving Light Around
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Examples
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Examples
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