Abstract
In this paper, an estimation system of rice plant nitrogen contents distribution in the paddy field is discussed for a precision farming by using the proximal remote sensing images. These images are taken at a panicle formation stage and a reduction division stage from a boundary of the rice field by using RGB digital camera. These bird's-eye view images are transformed to top views of a parallel projection to ease mapping. On parallel projected images, RGB brightness levels have a significant correlation with the nitrogen contents even on different time and different direction. Using satellite images are unsuitable for our objects, because of the rainy season, cloudy summer season, the long interval of satellite image and so on.
