Alexandrina Orzan

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Summary
» Research themes » Publications » Curriculum Vitae

I obtained my PhD at Grenoble Institute of Technology in June 2009, under the guidance of Joëlle Thollot and Jean-Marc Hasenfratz.

Research themes

Generally speaking, I'm interested in:

Image synthesis and image processing for expressive rendering
User interaction techniques for computer graphics
Perceptually-based rendering

My PhD work focused on user-guided image manipulation. The principle that spans my doctorate studies is that we can represent, create and edit pictures using a "contour-drawing" metaphor. Just as classical visual arts use line drawings as a starting point, we use the contours in a line drawing as a basis on which to build a digital image representation.

This principle is used in our SIGGRAPH 2008 paper, where we proposed a new vector-based primitive for creating complex color gradients: the diffusion curve. We showed that this representation is a simple, powerful and intuitive way of defining vector graphics images. Furthermore, diffusion curves can be extracted automatically from a photograph by relying on an edge-based structure we proposed in our NPAR 2007 paper. Diffusion curves can also natively handle textures, as described in our EGSR 2009 paper.