[en] A structure of the module program of ''Hydra'' system is described. It allows one to estimate quickly and efficiently a quality of events measured on a film for their further using to recognize tracks. A speed of algorithm is due to the application of method of pattern recognition on the fiducial plane. This program is used on CDC-6500 computer for selecting good events after the program of data filtering from the spiral reader digitizer. Constant selection, mode of result acquisition as hystograms and choice of processing stage can carry out in process of program generation from a special text file. Processing of a 5-body event takes 0.03-0.4 s of central processor unit on the computer. This time depends on the print type and mistakes in data measurements, labels or topology