pencil drawing production cewu lu, li xu , jiaya jia
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Pencil Drawing Production Cewu Lu, Li Xu, Jiaya Jia
Speaker: Ying-Jou Chen
![Page 2: Pencil Drawing Production Cewu Lu, Li Xu , Jiaya Jia](https://reader035.vdocument.in/reader035/viewer/2022062410/5681610d550346895dd063cd/html5/thumbnails/2.jpg)
AmazingDSP
![Page 3: Pencil Drawing Production Cewu Lu, Li Xu , Jiaya Jia](https://reader035.vdocument.in/reader035/viewer/2022062410/5681610d550346895dd063cd/html5/thumbnails/3.jpg)
Proposed Approach• Line Drawing• Tone Mapping
![Page 4: Pencil Drawing Production Cewu Lu, Li Xu , Jiaya Jia](https://reader035.vdocument.in/reader035/viewer/2022062410/5681610d550346895dd063cd/html5/thumbnails/4.jpg)
Line Drawing
• Idea… contour might be related…
Sobel Filter
Edge?
Not enough…
![Page 5: Pencil Drawing Production Cewu Lu, Li Xu , Jiaya Jia](https://reader035.vdocument.in/reader035/viewer/2022062410/5681610d550346895dd063cd/html5/thumbnails/5.jpg)
Line DrawingNot Simply Edges…
![Page 6: Pencil Drawing Production Cewu Lu, Li Xu , Jiaya Jia](https://reader035.vdocument.in/reader035/viewer/2022062410/5681610d550346895dd063cd/html5/thumbnails/6.jpg)
Line Drawing- Curve
• Idea… direction detection
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Line Drawing- Line Crossing
• Idea… CONVOLUTION• Effect of extension
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Line Drawing
⨂ ⨂ ⨂
+¿ +¿
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Line Drawing
⨂ ⨂ ⨂+¿ +¿
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Magically….
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DONE!
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Tone Mapping
Histogram
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Histogram
# of pixels
pixel value
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Pencil ToneNatural Tone
Histogram Equalization
![Page 15: Pencil Drawing Production Cewu Lu, Li Xu , Jiaya Jia](https://reader035.vdocument.in/reader035/viewer/2022062410/5681610d550346895dd063cd/html5/thumbnails/15.jpg)
Tone Mapping
• Model the shape by….
Laplacian Distribution
Uniform Distribution
Gaussian Distribution
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Pencil ToneNatural Tone
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DONE!DONE!
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Texture Rendering
Pencil Texture Rock Texture Chinese Drawing Texture
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Texture Rendering
𝜷=𝟎 .𝟐𝜷=𝟎 .𝟔
𝜷=𝟏 .𝟎𝜷=𝟏 .𝟒
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Texture Rendering
To each pixel, we hope that…
𝑷 (𝒙) 𝑱 (𝒙)
Pencil Tone
𝑷 (𝒙)𝜷( 𝒙)≈ 𝑱 (𝒙)
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Texture Rendering
Smooth
𝜷∗
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Other examples
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Reference• "Combining Sketch and Tone for Pencil Drawing Production",
Cewu Lu, Li Xu, Jiaya Jia , International Symposium on Non-Photorealistic Animation and Rendering (NPAR 2012), June, 2012
• ADMM optimization • YUV RGB transformation http://zh.wikipedia.org/wiki/YUV • Author’s website http://appsrv.cse.cuhk.edu.hk/~xuli