Tobias Ritschel
Abstract
We present a new approach for enhancing local scene contrast by unsharp masking over arbitrary surfaces under any form of illumination. Our adaptation of a well-known 2D technique to 3D interactive scenarios is designed to aid viewers in tasks like understanding complex or detailed geometric models, medical visualization and navigation in virtual environments. Our holistic approach enhances the depiction of various visual cues, including gradients from surface shading, surface reflectance, shadows, and highlights, to ease estimation of viewpoint, lighting conditions, shapes of objects and their world-space organization. Motivated by recent perceptual findings on 3D aspects of the Cornsweet illusion, we create scene coherent enhancements by treating cues in terms of their 3D context; doing so has a stronger effect than approaches that operate in a 2D image context and also achieves temporal coherence. We validate our unsharp masking in 3D with psychophysical experiments showing that the enhanced images are perceived to have better contrast and are preferred over unenhanced originals. Our operator runs at real-time rates on a GPU and the effect is easily controlled interactively within the rendering pipeline.
Supplemental Material
- Badamchizadeh, M. A., and Aghagolzadeh, A. 2004. Comparative study of unsharp masking methods for image enhancement. In International Conference on Image and Graphics (ICIG'04), 27--30. Google Scholar
Digital Library
- Bruckner, S., and Gröller, M. E. 2007. Enhancing depth-perception with flexible volumetric halos. IEEE Transactions on Visualization and Computer Graphics 13, 6, 1344--1351. Google ScholarDigital Library
- Cavanagh, P., and Leclerc, Y. 1989. Shape from shadows. Journal of Experimental Psychology: Human Perception and Performance 15, 1, 3--27.Google ScholarCross Ref
- Cignoni, P., Scopigno, R., and Tarini, M. 2005. A simple normal enhancement technique for interactive non-photorealistic renderings. Computer & Graphics 29, 1. Google ScholarDigital Library
- Cornsweet, T. 1970. Visual Perception. Chapter II: The Experiment of Hecht, Schlaer, and Pirenne. Academic Press.Google Scholar
- DeCarlo, D., Finkelstein, A., and Rusinkiewicz, S. 2004. Interactive rendering of suggestive contours with temporal coherence. In International Symposium on Non-Photorealistic Animation and Rendering (NPAR 2004), 15--145. Google ScholarDigital Library
- DeCoro, C., Cole, F., Finkelstein, A., and Rusinkiewicz, S. 2007. Stylized shadows. In International Symposium on Non-Photorealistic Animation and Rendering (NPAR 2007), 77--83. Google ScholarDigital Library
- Fleming, R., Torralba, A., and Adelson, E. H. 2004. Specular reflections and the perception of shape. Journal of Vision 4, 9, 798--820.Google ScholarCross Ref
- Kingdom, F., and Moulden, B. 1988. Border effects on brightness: A review of findings, models and issues. Spatial Vision 3, 255--262.Google ScholarCross Ref
- Krawczyk, G., Myszkowski, K., and Seidel, H.-P. 2007. Contrast restoration by adaptive countershading. In Computer Graphics Forum (Proceedings of Eurographics 2007), vol. 26.Google Scholar
- Landis, H. 2002. RenderMan in Production. In ACM SIGGRAPH 2002 Course 16. Google ScholarDigital Library
- Lehtinen, J., Zwicker, M., Kontkanen, J., Turquin, E., Sillion, F., and Aila, T. 2007. Meshless finite elements for hierarchical global illumination. Tech. Rep. TML-B7, Helsinki University of Technology, may.Google Scholar
- Luft, T., Colditz, C., and Deussen, O. 2006. Image enhancement by unsharp masking the depth buffer. ACM Trans. Graph. 25, 3, 1206--1213. Google ScholarDigital Library
- Purves, D., Shimpi, A., and Lotto, R. B. 1999. An empirical explanation of the cornsweet effect. J. of Neurosci 19, 8542--8551.Google ScholarCross Ref
- Rusinkiewicz, S., Burns, M., and DeCarlo, D. 2006. Exaggerated shading for depicting shape and detail. ACM Trans. Graph. SIGGRAPH 25, 3, 1199--1205. Google ScholarDigital Library
- Smith, K., Landes, P.-E., Thollot, J., and Myszkowski, K. 2008. Apparent greyscale: A simple and fast conversion to perceptually accurate images and video. Computer Graphics Forum (Proceedings of Eurographics 2008) 27, 2.Google Scholar
- Tarini, M., Cignoni, P., and Montani, C. 2006. Ambient occlusion and edge cueing for enhancing real time molecular visualization. IEEE Transactions on Visualization and Computer Graphics 12, 5, 1237--1244. Google ScholarDigital Library
- Taubin, G. 1995. A signal processing approach to fair surface design. In ACM Trans. Graph. SIGGRAPH, 351--358. Google ScholarDigital Library
- Zeng, W., Daly, S., and Lei, S. 2001. An overview of the visual optimization tools in JPEG 2000. Signal Processing: Image communication Journal 17, 1, 85--104.Google Scholar
Index Terms
- 3D unsharp masking for scene coherent enhancement
Recommendations
Feature enhancement by volumetric unsharp masking
Feature enhancement is important for the interpretation of complex structures and the detection of local details in volume visualization. We present a simple and effective method, volumetric unsharp masking, to enhance local contrast of features. In ...
Motion-coherent stylization with screen-space image filters
Expressive '18: Proceedings of the Joint Symposium on Computational Aesthetics and Sketch-Based Interfaces and Modeling and Non-Photorealistic Animation and RenderingOne of the qualities sought in expressive rendering is the 2D impression of the resulting style, called flatness. In the context of 3D scenes, screen-space stylization techniques are good candidates for flatness as they operate in the 2D image plane, ...
Spatiotemporal Antialiasing for Rendering 3D Scene with Specular Effect based on Virtual Hit Points
ICVIP '19: Proceedings of the 3rd International Conference on Video and Image ProcessingIn the past few decades, anti-aliasing method has been widely investigated in the field of computer graphics. Compared with the traditional anti-aliasing method, the anti-aliasing method with temporal coherence can avoid the computational cost of ...
Comments