Convergent stereo images can be rectified such that they correspond to the 
stereo normal case. The important advantage is that the correspondence analysis 
is simplified to a linear search along one of the image axes. The proposed 
method describes a rectification method for three uncalibrated cameras, where 
the configuration is not generally known. The algorithm automatically determines 
the best positioning of the cameras and corrects mirroring effects to fit the 
desired camera setup. Since there is no direct solution for the rectification 
problem for three cameras, the rectification homographies are linearly 
determined to within six degrees of freedom from three compatible fundamental 
matrices. The remaining six parameters are then obtained by enforcing additional 
constraints.