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# Mesh colorization presentation

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Mesh colorization presentation
by Chung-Yuan Lee from Yuan-Ze University, Taiwan

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### Mesh colorization presentation

1. 1. Mesh ColorizationAuthor: George Leifman and Ayellet TalEUROGRAPHICS 2012, May in ItalySpeaker: Chung-Yuan LeeYuan-Ze University
2. 2. Outline Introduction Proposed method ◦ Basic algorithm  Vertex similarity  Color propagation ◦ Feature line field Result Reference
3. 3. IntroductionA novel algorithm for colorization ofmeshes.
4. 4. Basic algorithm Vertex similarity◦ Step1. Vertex descriptor◦ Use spin image to describe vertex spreading.
5. 5. 2D histograms
6. 6. Use a relatively small support region, by setting α＝β＝８
7. 7. Basic algorithm Step2. Similarity measureModel the difference between twohistogramswhere
8. 8.  σ is a constant standard deviation for the Gaussian filter ϕ The notation denotes half size down-sampling
9. 9.
10. 10. Basic algorithm 1
11. 11. Basic algorithm Color propagationFor each color channel C in the YUV colorspace,the method minimize the following cost function.This equation constraint that two neighboringvertices should have similar colors if theirgeometry is similar.
12. 12. The result might include color bleeding near theboundaries !
13. 13. Feature line field Definition For neighboring points that belong to the same region, the directions of the associated vectors should have similar orientations. And vice versa!
14. 14. Feature line field Computation This method describe the computation for the case of valleys.
15. 15. Surrounding face Feature line field direction lies on the line perpendicular to the edge adjacent to itSolve the Laplace’s equation The average of all the field vectors computed for each face independently