In this paper we consider Anomaly Detection in the hyperspectral context, and extend popular RX detector, initially designed under standard additive model, to replacement model case. Indeed, more realistic framework, target, if present, is supposed replace a part of background. We show how estimate background power variation improve scheme. The obtained Replacement (RRX) shown be closed-form ou...

In many situations, it may be more economical to use a used unit than to do a new one. This paper considers an age replacement policy and a periodic replacement policy with minimal repair at failure for a used unit of age x. We discuss optimum replacement policies which minimize the expected cost rates for a specified age x. Further, we obtain an upper bound of an optimum time for an age replac...