Palm Recognition Camera Offset for Higher-Quality Image Capture
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Solution Overview
Problem
Existing palm recognition devices capture low-quality palm images due to the camera directly facing the central point of the image capturing window, affecting recognition speed and accuracy, requiring users to adjust their hand positioning during recognition.
Innovation Solution
The camera in the palm recognition device is positioned to project downward relative to the central point of the image capturing window, allowing for higher quality image capture without requiring users to change their hand alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the camera directly faces the central point of the image capturing window, then the device structure is simple and easy to manufacture, but the captured palm image quality is low affecting recognition speed and accuracy
Solution Approach 1:
The patent applies asymmetry by deliberately positioning the camera's optical axis to deviate from the central axis of the image capturing window. Specifically, the projection of the camera on the image capturing window deviates downward relative to the central point by a distance d where 0 < d ≤ 10mm. This asymmetric positioning allows the camera to capture higher quality palm images while maintaining a relatively simple device structure, resolving the contradiction between image quality and structural simplicity.
2Ease of operation
If the camera directly faces the central point of the image capturing window, then the device configuration is simple, but users need to adjust their hand positioning during recognition which reduces ease of operation
Solution Approach 1:
Instead of requiring users to adjust their hand positioning to match a centrally-aligned camera, the patent inverts the approach by adjusting the camera positioning to match users' natural hand placement. The camera's optical axis is positioned to deviate downward from the window center, allowing users to naturally place their palms at the window center without adjustment while still achieving high-quality image capture. This resolves the contradiction between ease of operation and image quality.
3Productivity
If the camera is positioned to improve image quality, then recognition accuracy improves, but the device structure becomes more complex
Solution Approach 1:
The patent applies parameter changes by modifying the positional parameter of the camera relative to the image capturing window. Specifically, it changes the offset distance d (where 0 < d ≤ 10mm) between the camera projection and the window center. This parameter adjustment optimizes the capture of palm vein patterns and other biometric features, thereby improving recognition speed and accuracy while maintaining a simple overall device structure without requiring additional complex components.
Data Source
AI summary
A palm recognition device is provided, and belongs to the field of the electronic device technologies. The palm recognition device includes a housing having a transparent image capturing window; a printed circuit board (PCB) located inside the housing; a light structure electrically connected to the PCB, wherein the light structure is configured to surround the transparent image capturing window; and a camera electrically connected to the PCB, wherein the camera is configured to project downward onto the transparent image capturing window at a location deviating from a central point of the transparent image capturing window and the light structure.