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A variety of operations of cellular automata on gray images is presented. Alloperations are of a wave-front nature finishing in a stable state. They areused to extract shape descripting gray objects robust to a variety of patterndistortions. Topographic terms are used: "lakes", "dales", "dales of dales". Itis shown how mutual object relations like "above" can be presented in terms ofgray image analysis and how it can be used for character classification and forgray pattern decomposition. Algorithms can be realized with a parallelasynchronous architecture. Keywords: Pattern Recognition, MathematicalMorphology, Cellular Automata, Wave-front Algorithms, Gray Image Analysis,Topographical Shape Descriptors, Asynchronous Parallel Processors, Holes,Cavities, Concavities, Graphs.

Asynchronous Cellular Operations on Gray Images Extracting Topographic Shape Features and Their Relations