Personal Care Device Position Tracking Using 3D Body Surface Models
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Solution Overview
Problem
Existing personal care devices lack precision in determining their true position relative to a human body surface, especially when partially occluded, which hinders accurate application of cosmetics or therapies.
Innovation Solution
A computer system uses image data and depth sensors to create a digital 3D model of the body surface, calculating the relative location and true position of the personal care device based on known physical dimensions and reference points, enabling precise interaction even when the device is partially occluded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image sensors are used to capture the personal care device and body surface, then the system can obtain visual data for position calculation, but the device may be partially occluded from view reducing measurement accuracy
Solution Approach 1:
The patent introduces a digital 3D model of the body surface as an intermediary reference framework. This model contains pre-defined reference points that serve as mediators between the image sensor observations and the true position calculation. By establishing correspondences between detected device positions in images and the 3D model reference points, the system can infer accurate positions even when the device is partially occluded, as the 3D model provides the geometric context needed to resolve ambiguities in the image data.
2Measurement precision
If the system calculates relative location based on image data, then it can determine device position, but it cannot determine true position when device is occluded
Solution Approach 1:
The patent performs preliminary action by pre-establishing a digital 3D model of the body surface with reference points before the actual position measurement. This 3D model serves as a pre-computed geometric framework that contains all necessary spatial information about the body surface topology. When the device is used, the system only needs to observe the device's position in the 3D space defined by this pre-established model, rather than needing to perform complex real-time calculations to determine true position, especially when occlusion occurs.
3Measurement precision
If the system uses known physical dimensions of the device, then it can calculate true position, but it increases device complexity requirements
Solution Approach 1:
The patent creates a digital copy or representation of the body surface in 3D space, complete with virtual reference points that mirror the actual anatomical features. This digital twin approach allows the system to work with simplified geometric data rather than complex real-time measurements. The 3D model acts as a copy that preserves the essential spatial relationships and reference structures, enabling accurate position calculations without requiring the physical device itself to be overly complex or require sophisticated real-time processing capabilities.
Data Source
AI summary
A computer system obtains a digital 3-dimensional model of a body surface, such as a human face. Portions of the surface correspond to reference points in the model. The system obtains image data of a personal care device in use as well as image data of the surface on which the model is based. The system calculates a relative location of the device relative to the reference points based on the image data of the surface. The system determines a true position of the device with respect to the surface based on the image data of the device in use, known physical dimensions of the device, and its relative location, even when the device is partially occluded from view. The system may, based on the true position of the device, cause device to perform actions such as application of a cosmetic or administration of a skin therapy.