It is the library on which the DocRead software is based. It is composed of various methods of adaptive binarization. Those use either local determination of threshold or edge detection and region growing cooperation. Some of these methods can provide results with a sub-pixel resolution. Using Kalman filters, this library carries out detection of rectilinear segments in complex images. It also contains a skeletonization method from gray level images. The selected resolution for the digitization of the documents is not always best adapted for the recognition of all structures. This is why the library also provides possibilities of multi-resolution processing.