M. Balzer and O. Deussen, Level-of-detail visualization of clustered graph layouts, 2007 6th International Asia-Pacific Symposium on Visualization, 2007.
DOI : 10.1109/APVIS.2007.329288

H. Bezerra, E. Eisemann, X. Décoret, and J. Thollot, 3D dynamic grouping for guided stylization, Proceedings of the 6th international symposium on Non-photorealistic animation and rendering , NPAR '08, pp.89-95, 2008.
DOI : 10.1145/1377980.1377998
URL : https://hal.archives-ouvertes.fr/inria-00345231

[. Bezerra, E. Eisemann, D. Decarlo, and J. Thollot, Diffusion constraints for vector graphics, Proceedings of the 8th International Symposium on Non-Photorealistic Animation and Rendering, NPAR 10, pp.35-42, 2010.
DOI : 10.1145/1809939.1809944
URL : https://hal.archives-ouvertes.fr/inria-00472752

J. A. Bangham, S. E. Gibson, and R. Harvey, The Art of Scale-Space, Procedings of the British Machine Vision Conference 2003, pp.569-578, 2003.
DOI : 10.5244/C.17.58

A. Bousseau and M. Kaplan, Joëlle Thollot, and François X. Sillion. Interactive watercolor rendering with temporal coherence and abstraction, Proceedings of NPAR 2006, pp.141-149, 2000.

A. Bousseau, F. Neyret, J. Thollot, and D. Salesin, Video watercolorization using bidirectional texture advection, Proceedings of SIGGRAPH 2007), 2007.
DOI : 10.1145/1275808.1276507
URL : https://hal.archives-ouvertes.fr/hal-00171411

P. Barla, J. Thollot, and L. Markosian, X-toon, Proceedings of the 3rd international symposium on Non-photorealistic animation and rendering , NPAR '06, pp.127-132, 2006.
DOI : 10.1145/1124728.1124749
URL : https://hal.archives-ouvertes.fr/inria-00362888

M. Brady and A. Yuille, An Extremum Principle for Shape from Contour, IJCAI'83: Proceedings of the Eighth international joint conference on Artificial intelligence, pp.969-972, 1983.
DOI : 10.1109/TPAMI.1984.4767521

[. Canny, A computational approach to edge detection, IEEE Trans. Pattern Anal. Mach. Intell, vol.8, issue.6, pp.679-698, 1986.

S. Carlsson, Sketch based coding of grey level images. Signal Process, pp.57-83, 1988.

J. Cassidy, S. E. Curtis, J. E. Anderson, K. W. Seims, D. H. Fleischer et al., Computer-generated watercolor, SIGGRAPH '97: Proceedings of the 24th annual conference on Computer graphics and interactive techniques, pp.421-430, 1997.

P. Cavanagh, The artist as neuroscientist, Nature, vol.6, issue.7031, pp.301-307, 2005.
DOI : 10.1073/pnas.96.4.1680

D. F. Cole, A. Decarlo, K. Finkelstein, K. Kin, A. Morley et al., Directing gaze in 3d models with stylized focus, Proceedings of Eurographics Symposium on Rendering 2006, pp.377-387, 2006.

G. Chen, P. Esch, P. Wonka, E. Müller, and . Zhang, Interactive procedural street modeling, ACM Trans. Graph, vol.27, issue.3, 2008.
DOI : 10.1145/1399504.1360702
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.151.7073

A. Forrester-cole, A. Golovinskiy, H. Limpaecher, A. Stoddart-barros, T. Finkelstein et al., Where do people draw lines?, SIGGRAPH '08: ACM SIGGRAPH 2008 papers, pp.1-11, 2008.

R. J. Wagner-toledo-corrêa, C. E. Jensen, A. Thayer, and . Finkelstein, Texture mapping for cel animation, SIGGRAPH '98: Proceedings of the 25th annual conference on Computer graphics and interactive techniques, pp.435-446, 1998.

]. M. Clo71, . [. Clowes, P. Comaniciu, and . Meer, On seeing things Mean shift: A robust approach toward feature space analysis, Artificial Intelligence IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.2, issue.245, pp.79-116603, 1971.

]. R. Coo86 and . Cook, Stochastic sampling in computer graphics, Proc. of SIG- GRAPH, pp.51-72, 1986.

[. Crane, Line and Form, 1900.

C. Csuri and J. Shaffer, Art, computers and mathematics. In AFIPS '68 (Fall, part II): Proceedings of the December 9-11, 1968, fall joint computer conference, part II, pp.1293-1298, 1968.

K. Forrester-cole, D. Sanik, A. Decarlo, T. Finkelstein, S. Funkhouser et al., How well do line drawings depict shape?, SIGGRAPH '09: ACM SIGGRAPH 2009 papers, pp.1-9, 2009.

F. Michael, J. Cohen, S. Shade, O. Hiller, and . Deussen, Wang tiles for image and texture generation, SIGGRAPH '03: ACM SIGGRAPH 2003 Papers, pp.287-294, 2003.

[. Cignoni, R. Scopigno, and M. Tarini, A simple normal enhancement technique for interactive non-photorealistic renderings, Computers & Graphics, vol.29, issue.1, pp.125-133, 2005.
DOI : 10.1016/j.cag.2004.11.012

[. Decarlo, A. Finkelstein, and S. Rusinkiewicz, Interactive rendering of suggestive contours with temporal coherence, Proceedings of the 3rd international symposium on Non-photorealistic animation and rendering , NPAR '04, pp.15-145, 2004.
DOI : 10.1145/987657.987661

D. Decarlo, A. Finkelstein, S. Rusinkiewicz, and A. Santella, Suggestive contours for conveying shape, SIGGRAPH '03: ACM SIGGRAPH 2003 Papers, pp.848-855, 2003.

[. Fiore and F. Van-reeth, Employing approximate 3D models to enrich traditional computer assisted animation, Proceedings of Computer Animation 2002 (CA 2002), pp.183-190, 2002.
DOI : 10.1109/CA.2002.1017532

D. Decarlo and S. Rusinkiewicz, Highlight lines for conveying shape, Proceedings of the 5th international symposium on Non-photorealistic animation and rendering, NPAR '07, pp.63-70, 2007.
DOI : 10.1145/1274871.1274881

A. [. Decarlo and . Santella, Stylization and abstraction of photographs, Proceedings of SIGGRAPH 2002, pp.769-776, 2002.

D. Decarlo and M. Stone, Visual explanations, Proceedings of the 8th International Symposium on Non-Photorealistic Animation and Rendering, NPAR 10, pp.173-178, 2010.
DOI : 10.1145/1809939.1809960

E. Paul, C. J. Debevec, J. Taylor, and . Malik, Modeling and rendering architecture from photographs: a hybrid geometry-and image-based approach, SIGGRAPH '96: Proceedings of the 23rd annual conference on Computer graphics and interactive techniques, pp.11-20, 1996.

F. Durand, Limitations of the medium and pictorial techniques Perceptual and Artistic Principles for Effective Computer Depiction, Course Notes for ACM SIGGRAPH, 2002.

B. Edwards, Drawing on the Artist Within: An Inspirational and Practical Guide to Increasing Your Creative Powers. Fireside, 1987.

H. James, R. M. Elder, and . Goldberg, Image editing in the contour domain, IEEE Trans. Pattern Anal. Mach. Intell, vol.23, issue.3, pp.291-296, 2001.

J. H. Elder, Are edges incomplete?, International Journal of Computer Vision, vol.34, issue.2/3, pp.97-122, 1999.
DOI : 10.1023/A:1008183703117

[. Eisemann, S. Paris, and F. Durand, A visibility algorithm for converting 3D meshes into editable 2D vector graphics, SIGGRAPH '09: ACM SIGGRAPH 2009 papers, pp.1-8, 2009.

E. Eisemann, H. Winnemöller, J. C. Hart, and D. Salesin, Stylized Vector Art from 3D Models with Region Support, Proceedings of the Eurographics Symposium on Rendering, 2008.
DOI : 10.1111/j.1467-8659.2008.01258.x
URL : https://hal.archives-ouvertes.fr/inria-00345295

H. James, S. W. Elder, and . Zucker, Space scale localization, blur, and contour-based image coding, Proceedings of the 1996 Conference on Computer Vision and Pattern Recognition, pp.0-27, 1996.

H. James, S. W. Elder, and . Zucker, Local scale control for edge detection and blur estimation, IEEE Trans. Pattern Anal. Mach. Intell, vol.20, issue.7, pp.699-716, 1998.

J. Feldman, Perceptual grouping by selection of a logically minimal model, International Journal of Computer Vision, vol.55, issue.1, pp.5-25, 2003.
DOI : 10.1023/A:1024454423670

H. Fang and J. C. Hart, Textureshop: Texture synthesis as a photograph editing tool, ACM Transactions on Graphics, vol.23, 2004.

G. Zeev-farbman, Y. Hoffer, D. Lipman, D. Cohen-or, and . Lischinski, Coordinates for instant image cloning, SIGGRAPH '09: ACM SIGGRAPH 2009 papers, pp.1-9, 2009.

A. Gooch, B. Gooch, P. Shirley, and E. Cohen, A nonphotorealistic lighting model for automatic technical illustration, SIG- GRAPH '98: Proceedings of the 25th annual conference on Computer graphics and interactive techniques, pp.447-452, 1998.

R. W. Gill, Basic Rendering: Effective Drawing for Designers, Artists and Illustrators, 1991.

E. Hans and G. , The Story Of Art, 1961.

S. Grabli, E. Turquin, F. Durand, and F. Sillion, Programmable style for npr line drawing, Rendering Techniques 2004 (Eurographics Symposium on Rendering, 2004.
URL : https://hal.archives-ouvertes.fr/inria-00510169

S. Grabli, E. Turquin, F. Durand, and F. X. Sillion, Programmable rendering of line drawing from 3D scenes, ACM Transactions on Graphics, vol.29, issue.2, pp.1-20, 2010.
DOI : 10.1145/1731047.1731056

]. D. Huf71 and . Huffman, Impossible objects as nonsense sentences, Machine Intelligence, vol.6, pp.295-323, 1971.

A. Hertzmann and D. Zorin, Illustrating smooth surfaces, Proceedings of the 27th annual conference on Computer graphics and interactive techniques , SIGGRAPH '00, pp.517-526, 2000.
DOI : 10.1145/344779.345074
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.10.4670

T. Isenberg and A. Brennecke, G-strokes: A concept for simplifying line stylization, Computers & Graphics, vol.30, issue.5, pp.754-766, 2006.
DOI : 10.1016/j.cag.2006.07.006

[. Isenberg, A. Brennecke, M. C. Sousa, and S. Carpendale, Beyond pixels: Illustration with vector graphics, 2006.

[. Interrante, H. Fuchs, and S. Pizer, Enhancing transparent skin surfaces with ridge and valley lines, Proceedings Visualization '95, p.52, 1995.
DOI : 10.1109/VISUAL.1995.480795

[. Igarashi, S. Matsuoka, and H. Tanaka, Teddy: a sketching interface for 3d freeform design, SIGGRAPH '06: ACM SIGGRAPH 2006 Courses, 2006.

T. Isenberg, P. Neumann, S. Carpendale, M. C. Sousa, and J. A. Jorge, Non-photorealistic rendering in context, Proceedings of the 3rd international symposium on Non-photorealistic animation and rendering , NPAR '06, pp.115-126, 2006.
DOI : 10.1145/1124728.1124747

N. [. Joshi and . Carr, Repoussé: Automatic inflation of 2d art, Proceeding of Eurographics Workshop on Sketch-Based Modeling, 2008.

S. Jeschke, D. Cline, and P. Wonka, A GPU laplacian solver for diffusion curves and poisson image editing, Proceedings of SIGGRAPH Asia, pp.1-8, 2009.
DOI : 10.1145/1618452.1618462

S. Jeschke, D. Cline, and P. Wonka, Rendering surface details with diffusion curves, Proceedings of SIGGRAPH Asia, pp.1-8, 2009.
DOI : 10.1145/1618452.1618463
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.230.5074

T. Judd, F. Durand, and E. Adelson, Apparent ridges for line drawing, SIGGRAPH '07: ACM SIGGRAPH 2007 papers, 2007.
DOI : 10.1145/1275808.1276401
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.117.5243

A. Jones, A. Gardner, M. Bolas, I. Mcdowall, and P. Debevec, Simulating spatially varying lighting on a live performance, 3rd European Conference on Visual Media Production (CVMP 2006). Part of the 2nd Multimedia Conference 2006, 2006.
DOI : 10.1049/cp:20061934

F. Scott and . Johnston, LUMO, NPAR '02: Proceedings of the 2nd international symposium on Non-photorealistic animation and rendering, p.45, 2002.
DOI : 10.1002/9781119951438.eibd0478

T. Kanade, Recovery of the three-dimensional shape of an object from a single view, Artificial Intelligence, vol.17, issue.1-3, pp.409-460, 1981.
DOI : 10.1016/0004-3702(81)90031-X

M. A. Kowalski, J. F. Hughes, C. B. Rubin, and J. Ohya, User-guided composition effects for art-based rendering, Proceedings of the 2001 symposium on Interactive 3D graphics , SI3D '01, pp.99-102, 2001.
DOI : 10.1145/364338.364374

D. Robert, L. Kalnins, B. J. Markosian, M. A. Meier, J. C. Kowalski et al., Wysiwyg npr: drawing strokes directly on 3d models, SIG- GRAPH '02: Proceedings of the 29th annual conference on Computer graphics and interactive techniques, pp.755-762, 2002.

E. Erum-arif-khan, R. W. Reinhard, H. H. Fleming, and . Bülthoff, Image-based material editing, ACM Transactions on Graphics, vol.25, issue.3, pp.654-663, 2006.
DOI : 10.1145/1141911.1141937

I. Michael-kolomenkin, A. Shimshoni, and . Tal, Demarcating curves for shape illustration, ACM Transactions on Graphics, vol.27, issue.5, pp.1-9, 2008.
DOI : 10.1145/1409060.1409110

]. J. Kvk92, A. J. Koenderink, and A. M. Kappers, Surface perception in pictures, Percept Psychophys, vol.52, issue.5, pp.487-496, 1992.

J. J. Koenderink, A. J. Vandoorn, A. M. Kappers, and J. T. Todd, Ambiguity and the ???Mental Eye??? in Pictorial Relief, Perception, vol.22, issue.4, pp.431-438, 2001.
DOI : 10.1068/p3030

A. Kolliopoulos, J. M. Wang, and A. Hertzmann, Segmentation-based 3d artistic rendering, Proceedings of Eurographics Symposium on Rendering 2006, pp.361-370, 2006.

G. Yvan, A. F. Leclerc, and . Bobick, The direct computation of height from shading, Conference on Computer Vision and Pattern Recognition, pp.552-558, 1991.

O. [. Luft and . Deussen, Watercolor illustrations of plants using a blurred depth test, Proceedings of NPAR 2004, pp.11-20, 2004.

A. Lagae and P. Dutré, Poisson sphere distributions, Vision, Modeling , and Visualization, 2006.

Y. Lai, . Shi-min, R. R. Hu, and . Martin, Automatic and topology-preserving gradient mesh generation for image vectorization, ACM Transactions on Graphics, vol.28, issue.3, pp.1-8, 2009.
DOI : 10.1145/1531326.1531391
URL : http://cg.cs.tsinghua.edu.cn/papers/Siggraph_2009_imagevectorization.pdf

]. G. Ll06a, B. Lecot, and . Levy, Ardeco: Automatic region detection and conversion, Proceedings of Eurographics Symposium on Rendering 2006, pp.349-360, 2006.

G. Lecot and B. Levy, Ardeco: Automatic Region DEtection and COnversion, Proceedings of the 17 th Eurographics Symposium on Rendering, pp.349-360, 2006.
URL : https://hal.archives-ouvertes.fr/inria-00105620

J. Lopez-moreno, J. Jimenez, S. Hadap, E. Reinhard, K. Anjyo et al., Stylized depiction of images based on depth perception, Proceedings of the 8th International Symposium on Non-Photorealistic Animation and Rendering, NPAR 10, 2010.
DOI : 10.1145/1809939.1809952

Y. Lee, L. Markosian, S. Lee, and J. F. Hughes, Line drawings via abstracted shading, SIGGRAPH '07: ACM SIGGRAPH 2007 papers, 2007.
DOI : 10.1145/1275808.1276400
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.151.5534

]. D. Lrc-+-03, M. Luebke, J. Reddy, A. Cohen, B. Varshney et al., Level of Detail for 3D Graphics, 2003.

[. Malik, Interpreting line drawings of curved objects, International Journal of Computer Vision, vol.62, issue.1, 1986.
DOI : 10.1007/BF00128527

. Mmk-+-00-]-l, B. Markosian, M. A. Meier, L. S. Kowalski, J. D. Holden et al., Art-based rendering with continuous level of details, Proceedings of NPAR 2000, pp.59-66, 2000.

J. Mccann and N. S. Pollard, Real-time gradient-domain painting, Proceedings of SIGGRAPH 2008, 2008.

K. Murakami, R. Tsuruno, and E. Genda, Natural-looking strokes for drawing applications, The Visual Computer, vol.19, issue.1, pp.415-423, 2006.
DOI : 10.1007/s00371-006-0021-7

[. Nicolaïdes, The Natural Way to Draw: A Working Plan for Art Study, 1990.

]. A. Nol66 and . Noll, Human or machine: A subjective comparison of piet mondrian's 'composition with lines' and a computer-generated picture. The Psychological Record, pp.1-10, 1966.

]. A. Nol67 and . Noll, The digital computer as a creative medium, IEEE Spectrum, vol.4, issue.10, pp.89-95, 1967.

[. Orzan, A. Bousseau, P. Barla, and J. Thollot, Structure-preserving manipulation of photographs, Proceedings of the 5th international symposium on Non-photorealistic animation and rendering, NPAR '07, pp.103-110, 2007.
DOI : 10.1145/1274871.1274888
URL : https://hal.archives-ouvertes.fr/inria-00362868

[. Ohtake, A. Belyaev, and H. Seidel, Ridge-valley lines on meshes via implicit surface fitting, ACM Transactions on Graphics, vol.23, issue.3, pp.609-612, 2004.
DOI : 10.1145/1015706.1015768
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.61.3562

A. Orzan, A. Bousseau, H. Winnemöller, P. Barla, J. Thollot et al., Diffusion curves: A vector representation for smooth-shaded images, Proceedings of SIGGRAPH 2008, 2008.
URL : https://hal.archives-ouvertes.fr/hal-00840848

M. Olson and H. Zhang, Silhouette Extraction in Hough Space, Proceedings of EUROGRAPHICS 2006, 2006.
DOI : 10.1111/1467-8659.00584

G. Okabe, Y. Zeng, T. Matsushita, L. Igarashi, H. Quan et al., Single-view relighting with normal map painting, Proceedings of Pacific Graphics, pp.27-34, 2006.

F. [. Paris and . Durand, A Topological Approach to Hierarchical Segmentation using Mean Shift, 2007 IEEE Conference on Computer Vision and Pattern Recognition, 2007.
DOI : 10.1109/CVPR.2007.383228

]. A. Pen84 and . Pentland, Local shading analysis, IEEE Transactions on Pattern Analysis and Machine Intelligence, PAMI, vol.6, issue.2, pp.170-187, 1984.

L. Petrovi´cpetrovi´c, B. Fujito, L. Williams, and A. Finkelstein, Shadows for cel animation, SIGGRAPH '00: Proceedings of the 27th annual conference on Computer graphics and interactive techniques, pp.511-516, 2000.

[. Pérez, M. Gangnet, and A. Blake, Poisson image editing, Proceedings of SIGGRAPH 2003, pp.313-318, 2003.

J. Piaget, La formation du symbole chez l'enfant: Imitation, jeu et rêve, image et représentation, page 310, Delachaux & Niestle, 1992.

[. Rusinkiewicz, M. Burns, and D. Decarlo, Exaggerated shading for depicting shape and detail, ACM Transactions on Graphics, vol.25, issue.3, pp.1199-1205, 2006.
DOI : 10.1145/1141911.1142015
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.294.9480

M. Stroila, E. Eisemann, and J. Hart, Clip Art Rendering of Smooth Isosurfaces, IEEE Transactions on Visualization and Computer Graphics, vol.14, issue.1, pp.135-145, 2008.
DOI : 10.1109/TVCG.2007.1058
URL : https://hal.archives-ouvertes.fr/inria-00345279

M. C. Sousa, K. Foster, B. Wyvill, and F. Samavati, Precise Ink Drawing of 3D Models, Proceedings of Eurographics 2003), pp.369-379, 2003.
DOI : 10.1016/S0016-7061(01)00136-7

J. Sun, L. Liang, F. Wen, and H. Shum, Image vectorization using optimized gradient meshes, ACM Transactions on Graphics, vol.26, issue.3, p.11, 2007.
DOI : 10.1145/1276377.1276391
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.306.6165

]. W. Spa00 and . Sparkes, How to shade from models, common objects, and casts of ornament, 1900.

A. M. Spalter, The Computer in the Visual Arts, 1998.

T. Strothotte and S. Schlechtweg, Non Photorealistic Computer Graphics: Modeling, Rendering and Animation, 2002.

[. Stover, What is a medium in art? Internet, 2010.

K. Sugihara, Machine interpretation of line drawings, 1986.

C. Toler-franklin, A. Finkelstein, and S. Rusinkiewicz, Illustration of complex real-world objects using images with normals, Proceedings of the 5th international symposium on Non-photorealistic animation and rendering, NPAR '07, 2007.
DOI : 10.1145/1274871.1274889

J. Tumblin and G. Turk, LCIS, Proceedings of the 26th annual conference on Computer graphics and interactive techniques , SIGGRAPH '99, pp.83-90, 1999.
DOI : 10.1145/311535.311544

R. Vergne, R. Pacanowski, P. Barla, X. Granier, and C. Schlick, Light warping for enhanced surface depiction, SIG- GRAPH '09: ACM SIGGRAPH 2009 papers, pp.1-8, 2009.
DOI : 10.1145/1531326.1531331
URL : https://hal.archives-ouvertes.fr/inria-00400829

]. G. Wah90 and . Wahba, Spline models for observational data, SIAM, vol.59, 1990.

]. D. Wal75 and . Waltz, Understanding line drawings of scenes with shadows The Psychology of Computer Vision, pp.19-91, 1975.

P. Willis, Projective Alpha Colour, Proceeding of Eurographics, 2006.
DOI : 10.1145/965161.806813

M. [. Wand and . Jones, Kernel Smoothing, 1995.
DOI : 10.1007/978-1-4899-4493-1

[. Winnemöller, A. Orzan, L. Boissieux, and J. Thollot, Texture Design and Draping in 2D Images, Proceedings of the Eurographics Symposium on Rendering 2009), pp.1091-1099, 2009.
DOI : 10.1111/j.1467-8659.2009.01486.x

H. Winnemoller, S. C. Olsen, and B. Gooch, Real-time video abstraction, Proceedings of SIGGRAPH 2006, pp.1221-1226, 2006.

]. F. Wql-+-06, Q. Wen, L. Luan, Y. Liang, H. Xu et al., Color sketch generation, Proceedings of NPAR 2006, pp.47-54, 2006.

G. Winkenbach and D. H. Salesin, Computer-generated pen-and-ink illustration, Proceedings of the 21st annual conference on Computer graphics and interactive techniques , SIGGRAPH '94, pp.91-100, 1994.
DOI : 10.1145/192161.192184
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.28.8980

T. Wu, C. Tang, M. S. Brown, and H. Shum, Shapepalettes: interactive normal transfer via sketching, SIGGRAPH '07: ACM SIGGRAPH 2007 papers, p.44, 2007.

J. Wang, B. Thiesson, Y. Xu, and M. F. Cohen, Image and Video Segmentation by Anisotropic Kernel Mean Shift, Proceedings of European Conference on Computer Vision, pp.238-249, 2004.
DOI : 10.1007/978-3-540-24671-8_19

G. Winkenbach, G. Winkenbach, D. H. Salesin, and D. H. Salesin, Rendering parametric surfaces in pen and ink, Proceedings of the 23rd annual conference on Computer graphics and interactive techniques , SIGGRAPH '96
DOI : 10.1145/237170.237287

J. Wang, Y. Xu, H. Shum, and M. F. Cohen, Video tooning, Proceedings of SIGGRAPH 2004, pp.574-583, 2004.

[. Yoshizawa, A. Belyaev, and H. Seidel, Fast and robust detection of crest lines on meshes, Proceedings of the 2005 ACM symposium on Solid and physical modeling , SPM '05, pp.227-232, 2005.
DOI : 10.1145/1060244.1060270

R. Zhang, P. Tsai, J. E. Cryer, and M. Shah, Shape from shading: A survey. Pattern Analysis and Machine Intelligence, pp.690-706, 1999.