1. Adobe Photoshop: Lasso tool. http://helpx.adobe.com/photoshop/using/selecting-lasso-tools.html
2. Berman, A., Dadourian, A., Vlahos, P.: Method for removing from an image the background surrounding a selected object. US Patent 6,134,346, 17 October 2000
3. Beucher, S., Meyer, F.: The morphological approach to segmentation: the watershed transformation. Mathematical morphology in image processing. Opt. Eng. 34, 433–481 (1993)
4. Bouman, C.: Cluster: An unsupervised algorithm for modeling Gaussian mixtures, April 1997. http://engineering.purdue.edu/bouman
5. Boykov, Y., Funka-Lea, G.: Graph cuts and efficient N-D image segmentation. Int. J. Comput. Vis. 70(2), 109–131 (2006)