Combining Sketch and Tone for Pencil Drawing Production

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Presentation transcript:

Combining Sketch and Tone for Pencil Drawing Production NPAR, 2012.(Best Paper Award)

Episode of <The Pacific>

Outline Previous work Observation (Two stages) Framework (Pencil drawing prior included) More Results Color Pencil Drawing

Previous Work (Image-based) Li and Huang 2003 Gao et al. 2010 Sun et al. 2007

Previous Work (Image-based) Li and Huang 2003 Gao et al. 2010 Sun et al. 2007

Previous Work (Image-based) Li and Huang 2003 Gao et al. 2010 Sun et al. 2007

Observation First Stage Second Stage Human Drawing Procedure

Observation Structure Tone

Framework Gradient Line Drawing Tone Mapping Texture Rendering

Framework(Line Drawing) Gradient Line Drawing Tone Mapping Texture Rendering

Framework(Line Drawing)

Framework(Line Drawing)

Framework(Line Drawing) A Naive method Pixel Direction

Framework(Line Drawing) A Naive method Extent along their Direction

Framework(Line Drawing) Proposed Edges Direction Classification 𝐶 1 𝐶 2

Framework(Line Drawing) Proposed Edges Direction Classification 𝐶 1 𝑎𝑟𝑔𝑚𝑎𝑥 𝐶 1 , 𝐶 2 =1 red 𝑎𝑟𝑔𝑚𝑎𝑥 𝐶 1 , 𝐶 2 =2 𝐶 2 blue

Framework(Line Drawing)

Framework(Line Drawing) Input

Framework(Line Drawing) … … Gradient

Framework(Line Drawing) … … C1 C2 C4 C8 G … …

Framework(Line Drawing)

Framework (Tone Mapping) Gradient Line Drawing Tone Mapping Texture Rendering

Framework (Tone Mapping) Natural Image Pencil Drawing

Framework (Tone Mapping)

Framework (Tone Mapping)

Framework (Tone Mapping) Three-Layer Structure

Framework (Tone Mapping) Bright Layer

Framework (Tone Mapping) Bright Layer

Framework (Tone Mapping) Mid-tone Layer

Framework (Tone Mapping) Mid-tone Layer

Framework (Tone Mapping) Dark Layer

Framework (Tone Mapping) Dark Layer

Framework (Tone Mapping) Unknown Parameters Bright Layer Mid-tone Layer Dark Layer 9 105 225 90 11

Framework (Tone Mapping)

Framework (Texture Rendering) Tonal Texture Pencil Tone

Framework (Texture Rendering) P Multiplication Model

Framework (Texture Rendering) In multiplication model ?

Framework (Texture Rendering) In multiplication model We need to solve Local smoothness

Framework (Texture Rendering) Objective function

Framework (Texture Rendering) Result

Framework (Combination) Gradient Line Drawing Tone Mapping Texture Rendering

Framework(Combination)

Framework(Combination) S

Framework(Combination) T·S

More Results

More Results

More Results

More Results

Color Pencil Drawing Y U V

Color Pencil Drawing Pencil Drawing YUV->RGB U V

Color Pencil Drawing

Color Pencil Drawing

The End