Skeleton Posture Retargeting via Prismatic Joints
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Solution Overview
Problem
The lack of standardization in digital human models (DHMs) leads to non-digital continuity between different applications, as various models are optimized for different aspects such as anthropometry, biomechanics, and behavioral simulations, resulting in varying degrees of accuracy in posture and motion modeling.
Innovation Solution
A computer-implemented method is provided that allows for the retargeting of postures between two skeletons, one complex and biologically accurate, and another simpler, by using prismatic joints on the target skeleton to achieve accurate posture synchronization with minimal computational cost, even when the target skeleton has fewer rotational joints than the source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex and biologically accurate skeleton is used for ergonomic analysis, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system divides the skeleton model into multiple segments or levels of complexity. A simplified skeleton structure is used for real-time animation applications, while a more complex biologically accurate skeleton is used for ergonomic analysis. This segmentation allows each skeleton type to be optimized for its specific purpose without compromising the other.
Solution Approach 2:
Different parts of the system use different levels of skeleton complexity. The animation module uses a simplified skeleton for computational efficiency, while the ergonomic analysis module uses a complex biologically accurate skeleton for precision. This local quality approach ensures that computational resources are allocated efficiently to where they are most needed.
2Adaptability or versatility
If posture retargeting is performed between skeletons with different numbers of rotational joints, then adaptability is improved, but manufacturing precision deteriorates
Solution Approach 1:
The system changes the parameters of the target skeleton by adding prismatic joints to bones that have fewer rotational joints in the source skeleton. This parameter modification allows the target skeleton to achieve the same posture as the source skeleton by compensating for the difference in rotational joint counts through prismatic joint translations.
Solution Approach 2:
Prismatic joints act as intermediaries between skeletons with different numbers of rotational joints. These intermediate elements enable posture transfer by providing additional degrees of freedom that compensate for the mismatch in rotational joint counts, allowing accurate retargeting between otherwise incompatible skeleton structures.
3Productivity
If prismatic joints are added to the target skeleton, then device complexity increases, but productivity improves
Solution Approach 1:
The system replaces complex rotational joint calculations with simpler prismatic joint translations in certain cases. By introducing prismatic joints, the retargeting algorithm can use straightforward translation operations instead of complex rotational transformations, thereby improving computational efficiency and productivity.
Data Source
AI summary
A computer-implemented method for making a skeleton of a modeled human or animal body take a posture, including obtaining a first and a second skeleton each comprising rotational joints connected by bones, each rotational joint of the second skeleton being associated to a respective joint of the first skeleton, determining a relative configuration of the second skeleton, mapping each joint of the first skeleton to a joint of the second skeleton, making the first skeleton take a posture defined by a rotational state for each joint of the first skeleton, and computing transformation matrices for the joints of the second skeleton such that a change is minimized, said second skeleton further including a prismatic joint on at least one of its bones, and determining rotations of the rotational joints and translation of the prismatic joint or joints of the second skeleton such that change is minimized.