Ecole Polytechnique Federale De Lausanne

Loic Arnaud Baboulaz

Martin Vetterli

Niranjan Thanikachalam

Sabine Suesstrunk

Paolo Prandoni

Damien Firmenich

The present invention concerns a method of method of relighting a media item comprising media elements. The method comprises, for at least some of the media elements: determining, in a first signal domain, a light transport function describing the appearance of a particular media element under different illumination conditions at least partly defined by positions of a light source used to illuminate the particular media element; sampling, in the first signal domain, the light transport function of the particular media element to obtain discrete data samples of the light transport function; projecting the data samples in the first signal domain into a sampling grid to obtain spatially sparsely and non-uniformly sampled light transport function; interpolating, in a second signal domain, the sparsely and non-uniformly sampled light transport function to obtain an approximate light transport matrix in the second signal domain; converting the approximate light transport matrix into the first signal domain to obtain an approximate substantially uniformly sampled light transport function in the first signal domain; and using, in the first signal domain, the approximate substantially uniformly light transport function to relight the media item.

Media item relighting technique

The invention refers to a method for analyzing reflected light of an object. First a light angle distribution for a point of the object is determined. Then a plenoptic projector is controlled to illuminate the point of the object with the determined light angle distribution. Then the reflected light intensity of the point of the object is measured and the measured reflected light is analyzed in dependence of the determined light angle distribution.

Method, system and computer program for determining a reflectance distribution function of an object

The present invention relates to an apparatus for imaging a page of a book or other similar document comprising: wherein the light sources are fixedly connected to a main frame, said main frame defining a partially or fully hemispherical dome; wherein said main frame comprises a first module and a second module, said second module being detachably connected to the first module at a first end thereof, said first end defining a plane that is obliquely orientated at an angle &#x3b2; relative to the support plane; and wherein, when the second module is disconnected from the first module, a free space between the first end of the first module and the support plane is adapted to permit the movement of the table and the book in the longitudinal and lateral directions without coming into contact with the main frame.

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Lausanne, Switzerland

Loic Arnaud Baboulaz