Video Image Processing Apparatus Posture Stability Determination

The patent introduces gravitational direction as a new dimension of analysis beyond joint positions. By adding the gravitational direction vector to the feature space, the system can distinguish between actions that have identical joint positions but different orientations relative to gravity, such as falling versus squatting, or standing versus lying down.

The patent changes the parameter set used for action recognition by incorporating gravitational direction information. This parameter change enables the system to differentiate between actions based on their relationship to the gravitational field, providing additional discriminative power without significantly increasing system complexity.

The patent adds gravitational direction as an additional dimension to the analysis, enabling distinction between actions that occur without object interaction. This dimensional extension allows the system to analyze pure postural actions by comparing joint positions against the gravitational reference frame.

The gravitational direction serves as an intermediary reference that mediates between joint positions and action classification. By introducing this intermediate gravitational reference, the system can indirectly infer action types through the relationship between body orientation and gravity, even when no objects are present.