Active contours are powerful methods for the segmentation of biomedical images. However, they usually segment only well cell at a time, which makes fastidious the segmentation of microscopic images that often contain hundreds of cells. The goal of this project is to develop an active contour that is able to jointly segment multiple cells. We will work on fluorescence images of the embryo of c-Elegans. In fact, the study of early cell division is an active field of research in developmental biology. Good notions on image processing and optimization are strongly advised, and experience with java is recommended.