Biometric Capture Device Synchronization for Distance Correction
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Solution Overview
Problem
In biometric authentication, it is challenging to achieve high authentication accuracy due to the difficulty in calculating a concise correction amount for biometric images when the biometric body moves, as the illumination light source and distance detection light source emit light at different timings, causing a gap between their positions.
Innovation Solution
A biometric capture device and method that uses a camera with multiple illumination light sources emitting near-infrared light and distance detection light sources emitting blue light, allowing simultaneous light emission to capture biometric images and distance information, with a process unit to correct the image size based on detected distance information, improving accuracy and reducing component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the illumination light source and distance detection light source emit light alternately at different timings, then the biometric image and distance information can be captured separately, but a gap occurs between the positions of the biometric body at different light emission timings, making it difficult to calculate a concise correction amount
Solution Approach 1:
The patent merges the emission timing of the illumination light source and distance detection light source to occur simultaneously. This allows the imaging device to capture both the biometric image illuminated by the illumination light and the distance information from the distance detection light at the same moment, eliminating the position gap caused by alternating emission and enabling accurate correction of biometric image size based on distance.
Solution Approach 2:
The patent performs preliminary synchronization of the light emission timing before image capture. By pre-coordinating that both the illumination light source and distance detection light source emit light at the same timing, the system ensures that the biometric body position remains consistent between the two measurements, allowing for accurate distance-based correction of the biometric image.
2Adaptability or versatility
If multiple light sources are used for illumination and distance detection, then both biometric image capture and distance measurement can be performed, but the system complexity and component costs increase
Solution Approach 1:
The patent makes the light sources perform multiple functions by having both the illumination light source and distance detection light source emit light simultaneously. The imaging device captures both the biometric image and distance information in one operation, making the system versatile while reducing the need for separate illumination and distance detection systems.
Solution Approach 2:
The patent combines the illumination function and distance detection function into a single coordinated operation. By merging the emission timing and capture process of both light sources, the system achieves dual functionality without requiring separate complex subsystems, thereby reducing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances authentication accuracy by correlating the distance between the camera and biometric body with the size of the biometric image, reducing the impact of movement and improving detection accuracy while minimizing component costs.
Implementation Method 1
a light source emits a light to a biometric body, and biometric information is acquired with use a reflection light from the biometric body
Implementation Method 2
a distance detection light source for acquiring a distance between the biometric body and an image capture device
Data Source
Figure 1A~1F
Figure 2A~2C
Figure 3A~3D
AI summary
A biometric capture device includes: a first light source configured to emit a light of a first wavelength to a biometric body; a second light source configured to emit a light of a second wavelength different from the first wavelength to the biometric body; a camera configured to capture a reflected light from the biometric body; a biometric information acquirer configured to acquire a biometric image based on a component of the first wavelength from an image captured by the camera; a distance information acquirer configured to acquire distance information between the biometric body and the camera based on a component of the second wavelength from the image captured by the camera; and a corrector configured to correct the biometric image based on the distance information.