Nail Printing Device Multi-Angle Camera Positioning
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Solution Overview
Problem
Conventional nail printing devices face challenges in accurately detecting the position of the nail for precise printing, as existing systems struggle to distinguish the nail from the surrounding components in images, leading to potential misalignment and reduced printing accuracy.
Innovation Solution
A printing device equipped with a finger stage and a camera system that captures images from multiple angles, utilizing an identifier on the nail rest to ensure accurate positioning by providing a reference for the nail's height and depth, allowing for precise alignment and improved image recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single camera is used to capture nail images, then the device complexity is reduced, but the measurement precision of nail position is insufficient
Solution Approach 1:
The patent transitions from single-plane imaging to multi-plane imaging by introducing a second camera positioned at a different angle. The first camera captures the nail surface from above, while the second camera captures the nail side surface from an angled position, enabling three-dimensional position detection through stereo vision principles.
Solution Approach 2:
The patent introduces an identifier (mark) as an intermediary element placed on the nail rest. This identifier serves as a reference point that appears in images from both cameras, facilitating the calculation of spatial relationships and improving the precision of nail position detection through coordinate transformation.
2Measurement precision
If an identifier is placed on the nail rest, then the measurement precision of nail position is improved, but the device complexity increases due to additional components
Solution Approach 1:
The patent employs an identifier with specific color properties that create high contrast against the nail rest background. This color differentiation enables easy identification and extraction of the identifier's position in images, improving measurement precision without requiring complex identifier structures.
Solution Approach 2:
The identifier on the nail rest serves multiple functions simultaneously: it marks the reference position for measurement, provides a visual guide for nail placement, and acts as a calibration reference for the camera system. This multi-functionality reduces the need for additional separate components.
3Measurement precision
If images are captured from multiple directions, then the measurement precision of nail position is improved, but the loss of time for image processing increases
Solution Approach 1:
The patent performs preliminary processing by detecting the identifier's position in each camera's image separately before combining the data. The identifier detection serves as a pre-processing step that establishes reference coordinates, simplifying the subsequent three-dimensional position calculation and reducing overall processing time.
Solution Approach 2:
The patent divides the image processing task into separate stages: first detecting the identifier position in each camera's image independently, then using these results to calculate the nail's three-dimensional position. This segmentation allows for optimized processing of each stage and reduces the computational burden of handling multi-angle images simultaneously.
Data Source
AI summary
Disclosed is a printing device including: a finger stage which has a nail rest, having an identifier, to place a tip of a nail, the nail being a printing target, and on which a finger corresponding to the nail is placed; and at least one camera which obtains an image from a first direction and an image from a second direction. The identifier which detects a position of the nail is provided on one surface of the nail rest such that the identifier does not exist in the image from the first direction but the identifier exists in the image from the second direction.