Automatic extraction of building statistics from digital orthophotos

In this paper we discuss uses of image segmentation, feature extraction and Bayesian networks for identifying buildings in digital orthophotos and the utilisation of the results for the automated computation of building stati stics. Our work differs from previous attempts in a number of ways. Firstly , image segmentation is accomplished using an adaptive multi-scale method w hich brings together region and edge information to segment the image into regions. Secondly, automated building feature extraction (e.g. corners) is optimised to fit with expert human annotation performance. The third aspect of this work is the exploration of Bayesian networks as a method for fusin g available information (ranging from corner information to solar angles as indicators of shadow location) to classify segmented regions as correspond ing to buildings or not. Such processes then permit the automatic compilati on of building statistics.