The book describes the principles of construction and features of the use of automatic devices for converting graphs into electrical signals and entering the latter into computers for analyzing dynamic processes in various fields of science and technology. Diagrams of decoders of diagrams, which have been used as input automata of digital computer, are given. Examples of practical applications of graph decoders are considered. The book is designed for specialists from design and research organizations involved in the use of automation and computer technology to automate statistical analysis of dynamic processes.