System and method of anomaly detection with categorical attributes
AssigneeHoneywell International Inc.
InventorsVit LIBAL, Pavel VACHA, Valerie GURALNIK
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Abstract
A method and apparatus where the method includes detecting a plurality of events related to the activities of users within a security system wherein the events are defined by a plurality of attributes, wherein at least one attribute is categorical and wherein a data distance between events is a function of event attributes, evaluating the detected events using a a density based anomaly detection method f(r), where r is a size of a neighborhood around a data point, comparing a value of the evaluated expression with a margin threshold value (msg(r)) and setting an alarm upon detecting that the value exceeds the threshold value.
Claims20
A method comprising:
- detecting a plurality of events related to the activities of users within a security system wherein the events are defined by a plurality of attributes, wherein at least one attribute is categorical and wherein a data distance between events is a function of event attributes;
- evaluating the detected events using a selected density based anomaly detection method responsive to a size of a neighborhood around a data point representing the event;
- comparing a value of the evaluated expression with a selected margin threshold value and
- setting an alarm upon detecting that the value exceeds the threshold value.
An apparatus comprising:
- an event processor that detects a plurality of events related to the activities of users within a security system wherein the events are defined by a plurality of attributes, wherein at least one attribute is categorical and wherein a data distance between events is a function of event attributes;
- an evaluation processor that evaluates the detected events using a density based anomaly detection method responsive to a size of a neighborhood around a data point representing the event;
- a comparison processor that compares a value of the evaluated expression with a selected margin threshold value and
- an alarm processor that sets an alarm upon detecting that the value exceeds the threshold value.
An apparatus comprising:
- a security system that detects security events within a secured area;
- a processor that detects events related to the activities of users within a security system wherein the events are defined by a plurality of attributes, wherein at least one attribute is categorical and wherein a data distance between events is a function of event attributes;
- a processor that evaluates the detected events using a selected density based anomaly detection method;
- a processor that compares a value of the evaluated expression with a margin threshold value and
- a processor that sets an alarm upon detecting that the value exceeds the threshold value.
Dependencies are inferred from the claim text.