The High Resolution Stereo (HRS) Scientific Assessment Program offered by the French space agency CNES and ISPRS, provided data sets from the SPOT stereo camera system (HRS) together with high precision ancillary data. Two test data sets from this program were evaluated: one is located in Germany, the other in Spain. The first goal was to derive orthoimages and digital surface models (DSM) from...

In this work, we propose a wavelet-based hierarchical approach using mutual information (MI) to solve the correspondence problem in stereo vision. The correspondence problem involves identifying corresponding pixels between images of a given stereo pair. This results in a disparity map which is required to extract depth information of the relevant scene. Until recently, mostly correlation-based...

Two basic questions must be answered when points are tracked in image sequences: how to select the features, and how to track them from frame to frame. The solution described in [2] combines these two problems to one; it is based on [1], where a method for registering two images for stereo matching is proposed. The applications of point tracking are manifold. In the following we use this techni...

Recently, the focus of safety systems for intelligent vehicles has been on researching and developing Advanced Driver Assistance Systems (ADAS). Most efforts have been concentrated at the driver, not taking into account the protection of the most vulnerable road users. This paper describes a pedestrian detection algorithm based on stereo vision. The use of visual information is a promising appr...

Stereo is a well-known technique for obtaining depth information from digital images. Nevertheless, this technique still suffers from a lack in accuracy and/or long computation time needed to match stereo images. A new hierarchical algorithm using an image pyramid for obtaining dense depth maps from color stereo images is presented. We show that matching results of high quality are obtained whe...

Using stereo disparity or depth information to detect and track moving objects is receiving increasing attention in recent years. However, this approach suffers from some difficulties, such as synchronisation between two cameras and doubling of the image-data size. Besides, traditional stereo-imaging systems have a limited field of view (FOV), which means that they need to rotate the cameras wh...

A 3-D optical imaging system based on active stereo vision and motion tracking is built to track the motion of patient and to register the time-sequenced images of cervix recorded during colposcopy. The imaging system is evaluated by examining human subjects in vivo before routine colposcopy examination procedures. The system tracks the motion of patient accurately. The temporal kinetics of the...

In this paper, we propose a new method that can remove view-disturbing noises from stereo images. One of the thorny problems in outdoor surveillance by a camera is that adherent noises such as waterdrops on the protecting glass surface lens disturb the view from the camera. Therefore, we propose a method for removing adherent noises from stereo images taken with a stereo camera system. Our meth...

This thesis presents an implementation of a stereo vision system, using image processing techniques to determine depth information from pairs of stereo images. This system, which aims to aid vehicle reversal, involves working with stereo images of different vehicles, and the distance between the stereo cameras and the target vehicle is determined. For a pair of stereo images, the system algorit...