PT Journal
AU Cesar Isaza
   Joaquin Salas
   Bogdan Raducanu
TI Rendering ground truth data sets to detect shadows cast by static objects in outdoors
SO Multimedia Tools and Applications
JI MTAP
PY 2014
BP 557
EP 571
VL 70
IS 1
DI 10.1007/s11042-013-1409-9
DE Synthetic ground truth data set; Sun position; Shadow detection; Static objects shadow detection
AB In our work, we are particularly interested in studying the shadows cast by static objects in outdoor environments, during daytime. To assess the accuracy of a shadow detection algorithm, we need ground truth information. The collection of such information is a very tedious task because it is a process that requires manual annotation. To overcome this severe limitation, we propose in this paper a methodology to automatically render ground truth using a virtual environment. To increase the degree of realism and usefulness of the simulated environment, we incorporate in the scenario the precise longitude, latitude and elevation of the actual location of the object, as well as the sun’s position for a given time and day. To evaluate our method, we consider a qualitative and a quantitative comparison. In the quantitative one, we analyze the shadow cast by a real object in a particular geographical location and its corresponding rendered model. To evaluate qualitatively the methodology, we use some ground truth images obtained both manually and automatically.
ER