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Soft Shadow Rendering based on Real Light Source Estimation in Augmented Reality
Zakiah Noh, Mohd Shahrizal Sunar
Pages - 26 - 36     |    Revised - 30-08-2010     |    Published - 30-10-2010
Volume - 1   Issue - 2    |    Publication Date - October 2010  Table of Contents
Augmented Reality, shadow, soft shadow, reflective sphere
The most challenging task in developing Augmented Reality (AR) applications is to make virtual objects mixed harmoniously with the real scene. To achieve photorealistic AR environment, three key issues must be emphasized namely consistency of geometry, illumination and speed. Shadow is an essential element to improve visual perception and realism. Without shadow, virtual objects will appear like it is floating and thus will make the environment look unrealistic. However, many shadow algorithms still have drawbacks such as producing sharp and hard-edged outlines, which make the shadow’s appearance unrealistic. Thus, this paper will focus on generating soft shadow in AR scene render based on real light sources position, where reflective sphere is used to create environment map image to estimate the light source from the real scene and render the soft shadows.
CITED BY (11)  
1 Alhajhamad, H., Sunar, M. S., & Kolivand, H. (2015). Automatic Estimation of illumination Features for Indoor Photorealistic Rendering in Augmented Reality. In Intelligent Software Methodologies, Tools and Techniques (pp. 541-554). Springer International Publishing.
2 Eem, C., Kim, I., Jung, Y., & Hong, H. (2015). Estimating illumination distribution to generate realistic shadows in augmented reality. KSII Trans. Internet Inf. Syst, 9(6), 2289-2301.
3 Alhajhamad, H., & Sunar, M. S. (2015).towards a realistic marker-based augmented reality scene:issue and prospective aspects. Jurnal Teknologi, 75(2).
4 Kolivand, H., Hasan Zakaria, A., & Sunar, M. S. (2015). Shadow Generation in Mixed Reality: A Comprehensive Survey. IETE Technical Review, 32(1), 3-15.
5 Kolivand, H., & Sunar, M. S. (2014). Covering photo-realistic properties of outdoor components with the effects of sky color in mixed reality. Multimedia Tools and Applications, 72(3), 2143-2162.
6 George, M. (2014). U.S. Patent No. 8,896,600. Washington, DC: U.S. Patent and Trademark Office.
7 Kolivand, H., & Sunar, M. S. (2014). Realistic real-time outdoor rendering in augmented reality.
8 Woo, A., & Poulin, P. (2012). Shadow Algorithms Data Miner. CRC Press.
9 LI Hong-bo, Wu Liang Liang, & Jiangsu and Chongqing. (2012). Adaptive Sampling and integration of augmented reality shadow generation algorithm. Computer Applications, 32 (07), 1860-1863.
10 Wang Weijie, Wan Tao Nguyen, Lin Jing, & off Dandan. (2012) based on augmented reality markers, real-time three-dimensional rendering.textile universities Science, 25 (2), 213-216.
11 Wang Weijie, Wan Tao Nguyen, Lin Jing, & off Dandan. (2012) based on three-dimensional augmented reality marker in real-time rendering. TEXTILE UNIVERSITIES Science, 25 (2), 213-216.
1 Google Scholar 
2 CiteSeerX 
3 refSeek 
4 iSEEK 
5 Scribd 
6 SlideShare 
8 PdfSR 
B. F. Jensen, J. S. Laursen, J.B. Madsen and T. W. Pedersen. “Simplifying Real Time Light Source Tracking and Credible Shadow Generation for Augmented Reality”. Institute for Media Technology, Aalborg University, 2009
C. B. Madsen, R. Laursen. “A Scalable GPU-Based Approach to Shading and Shadowing for Photo-Realistic Real-Time Augmented Reality”. In Proceedings International Conference on Graphics Theory and Applications, pp. 252 – 261, Barcelona, Spain, 2007
C. Loscos, G. Drettakis and L. Robert. “Interactive Virtual Relighting of Real Scenes”. IEEE Transactions on Visualization and Computer Graphics, 6(3):289-305, 2000
C.B. Madsen, M. K. D. Sorensen and M. Vittrup. “The Important of Shadows in Augmented Reality”. In Proceedings 6th Annual International Workshop on Presence, Aalborg, Denmark, 2003
C.B. Madsen, M. Nielsen. “Towards Probe-Less Augmented Reality”. A Position Paper, Computer Vision and Media Technology Lab, Aalborg University, Aalborg, Denmark, 2008
F. Yan. “Estimation of Light Source Environment For Illumination Consistency of Augmented Reality”. In First International Congress on Image and Signal Processing, 3:771-775, 2008
I. Sato, Y. Sato and K. Ikeuchi. “Acquiring a Radiance Distribution to Superimpose Virtual Objects onto a Real Scene”. IEEE Transactions on Visualization and Computer Graphics, 5(1):1-12, 1999
J. Hasenfratz, M. Lapierre, N. Holzschuch and F. Sillion. “A Survey of Real-Time Soft Shadows Algorithms”. Eurographics, 22(4):753-774, 2003
J. Konttinen, C.E. Hughes and S.N. Pattanaik. “The Future of Mixed Reality: Issues in Illumination and Shadows”, J. Defense Modeling and Simulation, 2(1):51-59, 2005
K. Agusanto, L. Li, Z. Chuangui and N.W. Sing. “Photorealistic Rendering for Augmented Reality Using Environment Illumination”. In Proceedings of the 2nd IEEE and ACM International Symposium on Mixed and Augmented Reality, pp.208, 2003
K. Jacobs, C. Angus and C. Loscos. “Automatic Generation of Consistent Shadows for Augmented Reality”. In Proceedings Graphics Interface, Vancouver, Canada, 2005
K. Jacobs, C. Loscos. “Classification Of Illumination Methods For Mixed Reality”. Computer Graphics Forum, 25(1):29-51, 2006
L. Williams. “Casting Curved Shadows on Curved Surfaces”. Computer Graphics. In Proceedings of ACM Siggraph, 1978
M. Haller, S. Drab and W. Hartmann. “A Real-Time Shadow Approach for an Augmented Reality Application Using Shadow Volumes”. In Proceedings of VRST 03, pp. 56–65, 2003
M. Herf, P.S. Heckbert. “Fast Soft Shadows”. Visual Proceedings SIGGRAPH 96, pp. 145, 1996
M. Kanbara, N. Yokoya. “Geometric and Photometric Registration for Real-Time Augmented Reality”. In IEEE and ACM International Symposium on Mixed and Augmented Reality (ISMAR), pp. 279, 2002
M. Kanbara, N. Yokoya. “Real-Time Estimation of Light Source Environment for Photorealistic Augmented Reality”. In Proceedings of the 17th International Conference on Pattern Recognition, pp. 911–914, Cambridge,United Kingdom, 2004
N. Sugano, H. Kato and K. Tachibana. “The Effects of Shadow Representation of Virtual Objects in Augmented Reality”. In IEEE/ACM International Symposium on Mixed and Augmented Reality (ISMAR 2003), IEEE Computer Society, pp. 76-83, 2003
O. Bimber, A. Grundheimer, G. Wetzstein and S. Knodel. “Consistent Illumination within Optical See-Through Augmented Environments”. In Proceedings of the 2nd IEEE and ACM International Symposium on Mixed and Augmented Reality, pp.198 , 2003
P. Debevec. “A Median Cut Algorithm for Light Probe Sampling”. International Conference on Computer Graphics and Interactive Techniques, Los Angeles, California, 2005
R. Azuma. “A Survey of Augmented Reality”. Presence: Teleoperators and Virtual Environments, 6:355-385, 1997
S. Gibson, A. Murta. “Interactive Rendering with Real World Illumination”. In Proceedings of Eurographics Symposium on Rendering 2000, pp. 365–376, 2000
S. Gibson, J. Cook, T. Howard and R. Hubbold. “Rapid Shadow Generation in Real-World Lighting Environments”. In Proceedings of Eurographics Symposium on Rendering 2003, pp. 219–229, 2003
T. Naemura, T. Nitta, A. Mimura and H. Harashima. “Virtual Shadows in Mixed Reality Environment using Flashlight-Like Devices”. Trans. Virtual Reality Society of Japan, 7(2): 227-237, 2002
Z. Noh, A.W. Ismail and M.S. Sunar. “Exploring the Potential of using Augmented Reality Approach in Cultural Heritage System”, Proceedings of the 2nd International Conference on Advanced Computer Theory and Engineering (ICACTE 2009), Cairo, Egypt, vol. 1, pp. 711- 718, 2009.
Z. Noh, M.S. Sunar and Z. Pan. “Review on Augmented Reality for Virtual Heritage System,” Edutainment 2009 Springer-Verlag Berlin Heidelberg, Lecture Note in Computer Science LNCS 5670, pp. 50–61, 2009.
Z. Noh, M.S. Sunar “A review on shadow techniques in augmented reality”, 2nd International Conference on Machine Vision, ICMV 2009 , pp. 320-324, 2009
Miss Zakiah Noh
Universiti Teknologi Malaysia - Malaysia
Dr. Mohd Shahrizal Sunar
Universiti Teknologi Malaysia - Malaysia

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