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Pencil Drawing Production Cewu Lu, Li Xu , Jiaya Jia. Speaker: Ying- Jou Chen. Amazing DSP. Proposed Approach. Line Drawing Tone Mapping. Line Drawing. Idea… contour might be related…. Edge?. Not enough…. Sobel Filter. Line Drawing. Not Simply Edges…. Line Drawing- Curve.

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Pencil drawing production cewu lu li xu jiaya jia

Pencil Drawing ProductionCewu Lu, Li Xu, JiayaJia

Speaker: Ying-Jou Chen


Amazing

DSP


Proposed approach
Proposed Approach

  • Line Drawing

  • Tone Mapping


Line drawing
Line Drawing

  • Idea… contour might be related…

Edge?

Not enough…

Sobel Filter


Line drawing1
Line Drawing

Not Simply Edges…


Line drawing curve
Line Drawing- Curve

  • Idea… direction detection


Line drawing line crossing
Line Drawing- Line Crossing

  • Idea… CONVOLUTION

  • Effect of extension






Tone mapping
Tone Mapping

Histogram


Histogram

# of pixels

pixel value


Natural Tone

Pencil Tone

Histogram Equalization


Tone mapping1
Tone Mapping

  • Model the shape by….

Gaussian Distribution

Uniform Distribution

Laplacian Distribution


Natural Tone

Pencil Tone


DONE!

DONE!


Texture rendering
Texture Rendering

Chinese Drawing

Texture

Pencil Texture

Rock Texture



Texture rendering2
Texture Rendering

To each pixel, we hope that…

Pencil Tone




Reference
Reference

  • "Combining Sketch and Tone for Pencil Drawing Production", Cewu Lu, Li Xu, JiayaJia, International Symposium on Non-Photorealistic Animation and Rendering (NPAR 2012), June, 2012

  • ADMM optimization

  • YUV RGB transformation http://zh.wikipedia.org/wiki/YUV

  • Author’swebsite http://appsrv.cse.cuhk.edu.hk/~xuli


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