The use of materials reinforced with long glass fiber is flood in the last years. This fact has caused that it is needed to know the behaviour certain mechanical characteristics he himself and who therefore an evaluation of the behaviour of he himself looks for.  The analysis of images is like a valid and effective methodology in the determination of the fiber direction. By means of an optimized secuentiation of algorithms one is able to identify, to isolate and to measure the direction of fibers of reinforcement in compound materials. Accompanied by a simple methodology of preparation of samples, we can establish a system of effective analysis.  This methodology has been applied in diverse processes of transformation in which habitually the fiber glass reinforcements are implied in composites. Fundamentally the injection process is analyzed, although processes compression and rtm do not forget. Later the analysis of the error is made which it is incurred the implementation of the system.