COMPUTER IMPLEMENTED METHOD AND DEVICE FOR ANOMALY DETECTION

• Main Authors: Schirrmeister, Robin Tibor, Zhang, Dan
• Format: Patent
• Language: English; French; German
• Published: 28.07.2021
• Subjects: CALCULATING; COMPUTING; COUNTING; HANDLING RECORD CARRIERS; PHYSICS; PRESENTATION OF DATA; RECOGNITION OF DATA; RECORD CARRIERS

A device and a computer implemented method of anomaly detection, characterized by processing a digital representation (302) of a signal or image with a wavelet decomposition to generate a first plurality of decomposed representations (304), processing a first decomposed representation (304a) of the first plurality of decomposed representations (304) with a wavelet decomposition to generate a second plurality of decomposed representations (306), processing a first decomposed representation (306a) of the second plurality of decomposed representations (306) with a wavelet decomposition to generate a third plurality of decomposed representations (308), processing a first decomposed representation (308a) of the third plurality of decomposed representations (308) with a first generative model (310) to determine a first likelihood (pθ1), processing at least one second decomposed representation (308b, 308c, 308d) of the third plurality of decomposed representations (308) with a second generative model (312) to determine a second likelihood (pθ2), processing (214) at least one second decomposed representation (306b, 306c, 306d) of the second plurality of decomposed representations (306) with a third generative model (314) to determine a third likelihood (pθ3), processing at least one second decomposed representation (304b, 304c, 304d) of the first plurality of decomposed representations (304) with a fourth generative model (316) to determine a fourth likelihood (pθ4), detecting an anomaly when at least one of the first likelihood (pθ1), the second likelihood (pθ2), the third likelihood (pθ3) and the fourth likelihood (pθ4) meets a criterium for anomaly detection.