Title of article :
Automatic View Selection Using Viewpoint Entropy and its Application to Image-Based Modelling
Author/Authors :
Pere-PauVazquez، نويسنده , , MiquelFeixas، نويسنده , , MateuSbert ، نويسنده , , WolfgangHeidrich، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Abstract :
In the last decade a new family of methods, namely Image-Based Rendering, has appeared. These techniques rely
on the use of precomputed images to totally or partially substitute the geometric representation of the scene. This
allows to obtain realistic renderings even with modest resources. The main problem is the amount of data needed,
mainly due to the high redundancy and the high computational cost of capture. In this paper we present a new
method to automatically determine the correct camera placement positions in order to obtain a minimal set of
views for Image-Based Rendering. The input is a 3D polyhedral model including textures and the output is a set
of views that sample all visible polygons at an appropriate rate. The viewpoints should cover all visible polygons
with an adequate quality, so that we sample the polygons at sufficient rate. This permits to avoid the excessive
redundancy of the data existing in several other approaches. We also reduce the cost of the capturing process, as
the number of actually computed reference views decreases. The localization of interesting viewpoints is performed
with the aid of an information theory-based measure, dubbed viewpoint entropy. This measure is used to determine
the amount of information seen from a viewpoint. Next we develop a greedy algorithm to minimize the number of
images needed to represent a scene. In contrast to other approaches, our system uses a special preprocess for
textures to avoid artifacts appearing in partially occluded textured polygons. Therefore no visible detail of these
images is lost
Keywords :
Computer graphics , image-based modelling and rendering , information theory , entropy.
Journal title :
Computer Graphics Forum
Journal title :
Computer Graphics Forum