Environmentally adaptive segmentation algorithm for outdoor image segmentation

An environmentally adaptive segmentation algorithm (EASA) was developed for outdoor field plant detection. Based on a partially supervised learning pr ocess, the algorithm can learn from environmental conditions in outdoor agr icultural fields and build an image segmentation look-up table on-the-fly. Experiments showed that the algorithm can adapt to most daytime conditions in outdoor fields, such as changes in light source temperature and soil typ e. When compared to a static segmentation technique which was trained under sunny conditions, the EASA improved the image segmentation by correctly cl assifying 26.9 and 54.3% more object pixels under partially cloudy and over cast conditions, respectively. The improved image segmentation of the EASA technique also allowed up to 32 times more plant cotyledons to be recognize d (by leaf morphology) under overcast lighting conditions when compared wit h a static segmentation technique trained under sunny conditions. (C) 1998 Elsevier Science B.V. All rights reserved.