The paper describes how associative techniques can contribute to reduc
ing data dimensionality for image understanding. Associative memories
enhance a vision system's robustness by their pattern-completion capab
ility; neural networks compensate for the limited storage capacity of
the memory arid provide adaptive nonlinear filtering to remove crossta
lk noise. Two associative schemata are defined: for visual classificat
ion and for stimulus response. The major concern is to preserve genera
l applicability, while ensuring practical effectiveness. Both a theore
tical discussion and experimental evidence support the satisfactory re
sults obtained.