(19)
(11)EP 1 986 125 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
30.11.2011 Bulletin 2011/48

(43)Date of publication A2:
29.10.2008 Bulletin 2008/44

(21)Application number: 08006504.8

(22)Date of filing:  31.03.2008
(51)International Patent Classification (IPC): 
G06K 9/00(2006.01)
(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30)Priority: 23.04.2007 US 738562

(71)Applicant: MITSUBISHI ELECTRIC CORPORATION
Chiyoda-ku Tokyo 100-8310 (JP)

(72)Inventors:
  • Nikovski, Daniel N.
    Cambridge, MA 02142 (US)
  • Jain, Ankur
    Cambridge, MA 02141 (US)

(74)Representative: Pfenning, Meinig & Partner GbR 
Patent- und Rechtsanwälte Theresienhöhe 13
80339 München
80339 München (DE)

  


(54)Method and system for detecting changes in sensor sample streams


(57) A method detects a change in a stream of samples acquired by a sensor. A stream of samples acquired by a sensor over time is stored sequentially in a buffer in which an oldest sample is discarded and a newest sample is stored when the buffer is full, such that the buffer forms a window of samples sliding forward in time. For each new sample, the buffer is partitioned into all possible pairs of contiguous sub-windows of samples including a first sub-window and a second sub-window such that the newest sample is stored in the second sub-window of the pair. A difference is determined between the first and second sub-window of each pair of the contiguous sub-windows of samples, and a maximum difference is assigned as a merit score. A change in the stream of samples is signaled if the merit score is greater than a predetermine threshold. The change can be abrupt or gradual.







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