We find this method applicable to images with lower resolution, as is the case in facades imaged in vertical aerial photography. Also not only rectangular windows but other window designs can be automatically detected as well and rather quickly, without training the program in advance. The window count is applicable in each image segment of a given facade, separately. Or one might want to merge the edge data sets and apply single window detection to the sum of all edges. A comparison of the various different methods for window detection is pending and will be subject of ongoing work