Announcements Final project presentations on Wednesday Each group has 10 minutes Place.ppt talk in artifact directory Final reports due on Friday at 11:59pm.

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Presentation transcript:

Announcements Final project presentations on Wednesday Each group has 10 minutes Place.ppt talk in artifact directory Final reports due on Friday at 11:59pm Web page (see project4 web page) Does not have to be long, but should be sufficient to describe what you did, related work, results, and discussion Evals at the end of class today

Matting and Transparency Slides adapted from Alexei Efros, Yung-Yu Chuang, and Shree Nayar

How does Superman fly? Super-human powers? OR Image Matting?

Digital matting Forrest Gump (1994)

Compositing  F B C foreground color alpha matte background plate composite compositing equation B F C  =0

Compositing  F B C composite compositing equation B F C  =1

Compositing  F B C composite compositing equation B F C  =0.6

Matting C observation compositing equation  F B

Matting C compositing equation  F B Three approaches: 1 reduce #unknowns 2 add observations 3 add priors

Matting (reduce #unknowns) C F BB difference matting 

Matting (reduce #unknowns) C F B blue screen matting 

Problems with color difference Background color is usually not perfect! (lighting, shadowing…)

Matting (add observations) F Smith & Blinn, 96  BC

Natural image matting BC Matting (add priors) F  B rotoscopingRuzon-Tomasi FG BG unknown

Bayesian framework f(z)+  zy para- meters observed signal Example: super-resolution de-blurring de-blocking …

Bayesian framework data evidence a-priori knowledge f(z)+  zy para- meters observed signal

Bayesian framework likelihood priors posterior probability

Priors

Bayesian matting

Optimization repeat until converge 1. fix alpha 2. fix F and B

inputtrimap alpha

input composite

Environment Matting and Compositing Video Douglas E. Zongker ~ Dawn M. Werner ~ Brian Curless ~ David H. Salesin

Fast Separation of Direct and Global Images Using High Frequency Illumination Shree K. Nayar Gurunandan G. Krishnan Columbia University SIGGRAPH Conference Boston, July 2006 Support: ONR, NSF, MERL Michael D. Grossberg City College of New York Ramesh Raskar MERL

source surface P Direct and Global Illumination A A : Direct B B : Interrelection C C : Subsurface D participating medium D : Volumetric translucent surface E E : Diffusion camera

direct global radiance Direct and Global Components: Interreflections surface i camera source j BRDF and geometry

High Frequency Illumination Pattern surface camera source fraction of activated source elements + i

High Frequency Illumination Pattern surface fraction of activated source elements camera source + - i

Separation from Two Images directglobal

Other Global Effects: Subsurface Scattering translucent surface camera source i j

Other Global Effects: Volumetric Scattering surface camera source participating medium i j

Diffuse Interreflections Specular Interreflections Volumetric Scattering Subsurface Scattering Diffusion

Scene

DirectGlobal

Real World Examples: Can You Guess the Images?

Eggs: Diffuse Interreflections DirectGlobal

Wooden Blocks: Specular Interreflections DirectGlobal

Kitchen Sink: Volumetric Scattering Volumetric Scattering: Chandrasekar 50, Ishimaru 78 DirectGlobal

Peppers: Subsurface Scattering DirectGlobal

Hand DirectGlobal Skin: Hanrahan and Krueger 93, Uchida 96, Haro 01, Jensen et al. 01, Cula and Dana 02, Igarashi et al. 05, Weyrich et al. 05

Face: Without and With Makeup GlobalDirect GlobalDirect Without Makeup With Makeup

Blonde Hair Hair Scattering: Stamm et al. 77, Bustard and Smith 91, Lu et al. 00 Marschner et al. 03 DirectGlobal

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