February 23, Tuesday
12:00 – 13:30
Geometry and Photometry of Imaging Through a Medium
Computer Science seminar
Lecturer : Tali Treibitz
Affiliation : Technion, Israel Institute of Technology
Location : 202/37
Host : Dr. Ohad Ben-Shahar
Images taken through a medium may suffer from poor visibility and loss
> of contrast. Light passing through undergoes absorption and
> scattering. Wavelength dependent attenuation causes changes in color
> and brightness. In addition, light that is scattered back from the
> medium into the camera (backscatter) veils the object, degrading
> visibility and contrast. Low signal to noise ratio imposes resolution
> limits, even if there is no blur. Moreover, refraction between the
> medium and the camera (in air) causes geometric distortions that harm
> geometric reconstruction. Nevertheless, there is a strong need to
> perform vision tasks in such media. Thus, in this work, we look both
> at photometric and geometrical aspects of imaging in these conditions.
>
> In the talk I give an overview of our contributions in this subject:
> - Resolution limits imposed by noise
> - Geometry limits: The non-single viewpoint nature of imaging systems
> looking into water through a flat glass.
> - Polarization-based removal of backscatter.
> All the above is demonstrated in field experiments underwater and in haze.
>
> * A PhD research under the supervision of Prof. Yoav Y. Schechner
>
>
>