Image Processing for Back-Sensor Palm Authentication
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Solution Overview
Problem
Existing image processing technologies for authentication in information terminals, such as smartphones and tablets, face challenges in accurately positioning body parts when the sensor is located on the back surface, leading to incorrect extraction of biological information and reduced authentication accuracy.
Innovation Solution
An image processing program and method that adjusts the display of the palm image on the screen based on the position of the user's face, using a camera to detect the eye's position and a distance sensor to measure the distance, allowing for proper alignment of the palm with the vein sensor, even when the sensor is positioned on the back of the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sensor is positioned on the back surface of the terminal, then the terminal structure is more compact and integrated, but the user cannot directly view the sensor position making body part positioning difficult
Solution Approach 1:
The patent creates a virtual copy of the sensor's field of view by capturing an image with a camera positioned at the same location as the back sensor, then displays this image on the front screen. This allows users to see what the back sensor sees without physically looking at the back surface, enabling intuitive positioning of body parts while maintaining the compact back-sensor configuration.
Solution Approach 2:
The camera and display screen act as intermediaries between the user and the back sensor. Instead of directly observing the sensor position on the back surface, users interact with the intermediary image display that represents the sensor's perspective, making positioning intuitive despite the sensor's hidden location.
2Measurement precision
If operation instructions are displayed to guide body part positioning, then positioning accuracy improves, but authentication time increases
Solution Approach 1:
The system provides real-time visual feedback through the displayed camera image, allowing users to self-correct their positioning by comparing the displayed image with their intended body part position. This eliminates the need for repetitive trial-and-error with operation instructions, reducing authentication time while maintaining positioning accuracy.
Solution Approach 2:
The displayed image from the camera provides immediate visual feedback about body part position relative to the sensor's field of view. Users can adjust positioning based on this feedback, achieving accurate positioning faster than with text-based operation instructions alone.
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
Improves the accuracy of authentication by ensuring the palm is correctly positioned and sized on the screen, enhancing the matching of extracted vein characteristics with registered data.
Implementation Method 1
a camera to detect the eye's position
Implementation Method 2
a distance sensor to measure the distance
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
An information terminal (10) including a screen, a first sensor provided on a back surface of a surface on which the screen is disposed, and a second sensor displays an image of a first subject that is captured by the first sensor on the screen. Upon displaying, the information terminal (10) changes a degree of scaling up/down of the image of the first subject and a position at which the image is displayed in accordance with a position of a second subject that is imaged by the second sensor provided to the information terminal (10).