Alexander Borghgraef

Royal Military Academy · Department of Communication, Information, Systems and Sensors (CISS)

NATO Research Task Group SET-260 aimed at bringing together experts in EO/IR detection among the NATO community to share detection knowledge and signature data of mini and micro UAVs in an urban environment. Within the program of work of SET-260, a NATO joint trial was organized to collect UAV EO/IR signatures of UAVs in different bands with an urb...

Ship-based automatic detection of small floating objects on an agitated sea surface remains a hard problem. Our main concern is the detection of floating mines, which proved a real threat to shipping in confined waterways during the first Gulf War, but applications include salvaging, search-and-rescue operation, perimeter, or harbour defense. Detec...

For locating maritime vessels longer than 45 meters, such vessels are required to set up an Automatic Identification System (AIS) used by vessel traffic services. However, when a boat is shutting down its AIS, there are no means to detect it in open sea. In this paper, we use Electro-Optical (EO) imagers for noncooperative vessel detection when the...

Most of the current SAR systems aquire fully polarimetric data where the obtained scattering information can be represented by various coherent and incoherent parameters. In previous contributions we reviewed these parameters in terms of their "utility" for landcover classification, here, we investigate their impact on several classification algori...

For locating maritime vessels longer than 45 meters, such vessels are required to set up an Automatic Identification System (AIS) used by vessel traffic services (VTS). However, when a boat is shutting down its AIS, there are no means to detect it in open sea. In this paper, we use Electro-Optical (EO) imagers for non-cooperative vessel detection w...

Ship-based automatic detection of small floating objects on an agitated sea surface remains a hard problem. Our main concern is the detection of floating mines, which proved a real threat to shipping in confined waterways during the first Gulf War, but applications include salvaging,search-and-rescue and perimeter or harbour defense. IR video was c...

is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of t...

In this paper we examine a system based on computer vision for automated detection of change and anomalies in GIS road networks using very high resolution satellite images. The system consists out of a low-level feature detection process, which extracts road junctions, and a high-level matching process, which uses graph matching to find corresponde...

In this work, the positional error components are studied in the process of registering SAR image data to vector data. We study the case in which only imprecise knowledge of a terrain model is available, affecting the achievable accuracy of the final registration. The available information is used to draw a spatial quality map which aids in determi...

In this paper we propose a system for automated quality assessment of road vector data based on very-high-resolution satellite images. The system is based on feature based spatial registration, where de- tected features in the image are registered to corresponding features in the vector data. For our application, crossroads were found to be stable...

We propose a graph matching methodology based on relaxation labeling to compare road junction in VHR satellite images with GIS road data. Use is made of the spatial layout between points based on the relative angle. The technique finds correspondences between set of points taking into account error on the spatial location and spurious or missing po...

We introduce a methodology to predict the performance of road detection based on the ridge detector. The method is based on measured image statistics of the road and its immediate surroundings. It predicts the performance of the detection as well as the optimal parameter set which is needed for this detection.

In the domain of mine-warfare, the detection of targets floating on the surface has re- mained dicult to automate. Nevertheless, experience in the Persian Gulf has proved that unmoored floating mines are a realistic threat to shipping trac. An automated system ca- pable of detecting these and other free-floating small objects, using readily availab...

We have studied the major positional error components in the process of registering SAR image data to vector data. This way we intend to attach a spatial quality measure to said image, in order to assess the level of change a change detection process will be able to detect.