Asynchronous Optical Guide Projection for Accurate Body Part Feature Detection
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Solution Overview
Problem
Current systems for personal care activities, such as those involving mirrors, face challenges in accurately determining body part features due to interference from optically projected guidance information, leading to unnatural and unintuitive user experiences.
Innovation Solution
A projection and measurement system comprising a projection unit, tracking unit, and control unit that desynchronizes the projection of optical guides with image detection, allowing for asynchronous projection and modulation of light to distinguish guidance from detected images, enabling accurate feature determination without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical guidance information is projected onto the body part simultaneously with image detection, then the user receives real-time guidance information, but the projected light interferes with image detection accuracy
Solution Approach 1:
The system implements periodic action by alternately performing image detection and optical projection in separate time intervals. The control unit detects images at specific time points when no projection occurs, then projects optical guidance information in subsequent intervals. This temporal separation eliminates light interference during detection while maintaining real-time guidance through rapid cycling, directly resolving the contradiction between providing continuous guidance and ensuring accurate detection.
2Productivity
If the projection and image detection occur simultaneously, then the system provides continuous visual feedback, but the projected light causes interference patterns that degrade feature determination accuracy
Solution Approach 1:
The system uses periodic action to alternate between projection and detection phases, ensuring that detection occurs during dark intervals when no projection light is present. This maintains continuous operational cycles while preventing interference patterns during critical measurement phases.
Solution Approach 2:
The control unit acts as an intermediary that coordinates the timing between projection and detection operations. It manages the temporal sequencing, ensuring detection occurs only when projection is inactive, thereby mediating between the conflicting requirements of continuous feedback and accurate measurement.
3Adaptability or versatility
If the optical guide is projected synchronously with image detection, then the guidance information aligns with the detected features, but the projected light creates interference that prevents accurate feature detection
Solution Approach 1:
The system achieves guidance-feature alignment through periodic action by detecting features during dark intervals, generating guidance based on detected features, then projecting the optical guide in subsequent intervals. The tracking unit ensures the projected guide remains spatially aligned with the body part across cycles, maintaining adaptability while eliminating interference through temporal separation.
Data Source
AI summary
A projection and measurement system (100) comprising a projection unit (110), a tracking unit (120), and a control unit (130). The control unit (130) is configured to control the projection unit to determine a feature of the body part of the user, generate an optical guide to be projected onto the body part based on the determined feature, and control the projection unit to project the optical guide. The control unit (130) is further configured to control the projection unit (110) to project the optical guide onto the body part in an asynchronous manner with respect to the detection of the image of the body part, and/or to generate a modulated form of the optical guide and/or illuminating light to be projected onto the body part.