Patent ID: 7555399
Filing Date: 2009-06-30
Classification: G06K

Abstract:
1. A method for detecting a change in a stream of samples acquired by a sensor, comprising the steps of: storing sequentially a stream of samples acquired by a sensor over time 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; partitioning, for each new sample, the buffer 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; determining a difference between the first and second sub-window of each pair of the contiguous sub-windows of samples; assigning a maximum difference as a merit score; and signaling a change in the stream of samples if the merit score is greater than a predetermined threshold.