Exploratory project PERSYVAL-Lab 2016-2017
The Carambole projects initiates a new collaboration between computer scientists from University of Grenoble Alpes and biophysicists from University Paris Diderot. The objectives are to develop hardware and software to help tracking feature points on a leaf of Averrhoa Carambola during its growth with a multi-camera system and to measure their 3D motion. This will be done in 7 successive stages:
- Definition of the camera set-up.
- Sensor calibration.
- Image acquisition.
- Virtual 3D model reconstruction at each time step.
- Temporal tracking to get a temporally coherent 4D model.
- Growth modelling with a compact spatio-temporal model.
- Motion measurement.
Averrhoa carambola is of special interest because of the distinctive nutation balancing motion of a leaf during its growth. Other interesting motions are the longitudinal growth of the leaf as well as its rolling out. Total growth lasts about two weeks.
LJK, Univ. Grenoble Alpes
- Franck Hétroy-Wheeler
- Julien Pansiot
- Henrique Maziero (intern, summer 2016)
- Robin Vincent-Deleuze (intern, summer 2016)
Laboratoire MSC, Univ. Paris Diderot
- Julien Derr
- Mathieu Rivière
3D mesh model of an Averrhoa Carambola leaf with and without texture.
Left: approximation of the spine of an Averrhoa Carambola leaf for 70 successive time steps. Right: spine for the first and last time steps. The nutation motion is clearly visible.
Feature matching on two successive images of an Averrhoa Carambola leaf.