Prism Authentication Apparatus for High Precision Forgery Detection
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Solution Overview
Problem
Existing authentication technologies fail to detect finger forgery with high precision when comparing reflected and transmitted light images from the same finger, and require separate imaging apparatus for high contrast and natural images, leading to larger authentication systems.
Innovation Solution
An authentication apparatus with a prism body that includes a living body contact surface, an imaging surface, a first reflection surface angled to reflect light from convex portions, and a second reflection surface to reflect light from concave portions, allowing a single imaging unit to capture high contrast and natural images simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple imaging apparatus are used to obtain both high contrast image and natural image, then image quality for authentication is improved, but device complexity and size increase
Solution Approach 1:
The patent combines multiple imaging functions into a single imaging apparatus by using a beam splitter that divides light from a single illumination source to create both high contrast images (reflected light) and natural images (transmitted light) simultaneously, eliminating the need for multiple separate imaging devices
Solution Approach 2:
The single imaging apparatus is designed to perform multiple imaging functions by capturing both high contrast images and natural images through different optical paths within the same device, making it a universal authentication tool that replaces what would traditionally require multiple specialized devices
2Device complexity
If only the image of the portion in contact with the prism is obtained, then device complexity is reduced, but measurement precision for forgery detection deteriorates
Solution Approach 1:
The patent segments the imaging process into two distinct optical paths within a single apparatus: one path captures high contrast images of the contact portion through reflected light, while the other path captures natural images of the entire finger including non-contact portions through transmitted light, allowing comprehensive forgery detection without increasing 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
Enables high precision detection of finger forgery by obtaining high contrast and natural images with sufficient contrast for authentication using a single imaging apparatus, reducing system size and improving detection accuracy.
Implementation Method 1
a first reflection surface configured to be opposed to the imaging surface, in contact with the living body contact surface to make an angle to be lower than an optimum angle to an incident light from a concave portion of the living body, and to reflect an incident light from a convex portion of the living body on the imaging surface
Data Source
AI summary
An authentication apparatus includes a prism and an imaging unit. The prism comprises: a contact surface, an imaging surface, a first reflection surface opposed to the imaging surface, contacted with the contact surface to make an angle to be lower than an optimum angle to an incident light from a concave portion of the living body, and to reflect an incident light from a convex portion of the living body on the imaging surface and a second reflection surface opposed to the imaging surface, contacted with the first reflection surface, and to form a reflection body that reflects the incident light from the concave portion of the living body and the incident light from the convex portion of the living body on the imaging surface. The imaging unit images the light which is reflected by the first reflection surface and the light, which is reflected by the second reflection surface.