Publication

SAMMPLE: Detecting Semantic Indoor Activities in Practical Settings using Locomotive Signatures

Karl Aberer
2012
Conference Papers

Abstract

We analyze mobile phone-generated sensor feeds to de- termine the high-level (i.e., at the semantic level), indoor, lifestyle activities of individuals, such as cooking/dining at home and working/having-lunch at the workplace. We pro- pose and evaluate a 2-Tier activity extraction framework (called SAMMPLE) where features of the accelerometer data are first used to identify individual locomotive micro- activities (e.g., sitting or standing), and the micro-activity sequence is subsequently used to identify the discrimina- tory characteristics of individual semantic activities. Using 152 days of real-life behavioral traces from users to detect semantic activities, our approach achieves an average ac- curacy of 77.14%, an improvement of 16.37% from the traditional 1-Tier approach that directly uses statistical features of the accelerometer stream.

Official source

https://infoscience.epfl.ch/entities/publication/2e7fd5a1-51ad-4fc7-8e2b-c04dea5ecb01

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Karl Aberer
2012
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2e7fd5a1-51ad-4fc7-8e2b-c04dea5ecb01

About this result

Related concepts (21)

Accelerometer

An accelerometer is a tool that measures proper acceleration. Proper acceleration is the acceleration (the rate of change of velocity) of a body in its own instantaneous rest frame; this is different from coordinate acceleration, which is acceleration in a fixed coordinate system. For example, an accelerometer at rest on the surface of the Earth will measure an acceleration due to Earth's gravity, straight upwards (by definition) of g ≈ 9.81 m/s2. By contrast, accelerometers in free fall (falling toward the center of the Earth at a rate of about 9.

Semantics

Semantics () is the study of reference, meaning, or truth. The term can be used to refer to subfields of several distinct disciplines, including philosophy, linguistics and computer science. In English, the study of meaning in language has been known by many names that involve the Ancient Greek word σῆμα (sema, "sign, mark, token"). In 1690, a Greek rendering of the term semiotics, the interpretation of signs and symbols, finds an early allusion in John Locke's An Essay Concerning Human Understanding: The third Branch may be called σημειωτική [simeiotikí, "semiotics"], or the Doctrine of Signs, the most usual whereof being words, it is aptly enough termed also λογικὴ, Logick.

Inertial measurement unit

An inertial measurement unit (IMU) is an electronic device that measures and reports a body's specific force, angular rate, and sometimes the orientation of the body, using a combination of accelerometers, gyroscopes, and sometimes magnetometers. When the magnetometer is included, IMUs are referred to as IMMUs. IMUs are typically used to maneuver modern vehicles including motorcycles, missiles, aircraft (an attitude and heading reference system), including unmanned aerial vehicles (UAVs), among many others, and spacecraft, including satellites and landers.

Related publications (1)

SAMMPLE: Detecting Semantic Indoor Activities in Practical Settings using Locomotive Signatures

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Semantic Activity Classification Using Locomotive Signatures from Mobile Phones