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Soft Body Dynamics (SBD)

Soft Body Dynamics is a term that is well established in the field of computer graphics and was first used in 1985. SBD summarises the complex properties and behaviour of deformable objects (soft bodies) such as the change of shape in motion and its realistic emulation/simulation.

Soft Body Dynamics are also a fix part in any vital signs monitoring as humans are soft bodies. Although soft bodies retain in motion its shape to some degree, this is not sufficient that such motion/deformation can be fully covered by traditional motion capturing. Therefore, STBL expanded the traditional monitoring concept by an additional pillar and called the expanded methodogical concept The Four Pillar Principle Of Continuous Monitoring.

When capturing prime (vital) signs such as pulse waves, breathing or others continuously people remain in motion to some degree. As a result, prime signals are almost always distorted to some degree by motion/deformation artefacts and noises. Therefore, prime signals as well as artefact/noise signals must be recorded simultaneously in order to be able to filter distorted prime signals with special algorithmen. Only artefacts/noises which can be charcterized can be used for the filtering process. Periods with unrecognizable distortions must be deleted/excluded. However, when artefacts/noises are not recorded, distorted raw prime signals give wrong results, as the distortion can not be recognized. While in the field of computer graphics the emulation of Soft Body Dynamics is sufficient for a realistic results, this does not suffice in the field of vital signs monitoring, where precise monitoring is key.

A more detailed description about the differences of Soft Body Dynamics and Linear 3D-Motions can be found  under "Read more".

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