Classic detectors
Noisy signal processing methods

Detection is a special case of classification, obtained by restriction to two hypotheses, "absence of signal" H ₀ , and "presence of signal" H ₁ , and two decisions "absence of signal" δ ₀ , and "presence of signal" δ ₁ . Nevertheless, we generally distinguish the detector on the one hand, from the two-class classifier on the other, by giving it a dissymmetrical structure with respect to the two hypotheses.