Optical Sensor Fingerprint Logo Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In under-screen optical fingerprint identification, the presence of a fingerprint logo in the captured image leads to a high false rejection rate (FRR) due to the inability to accurately determine when the logo is eliminated, resulting in reduced user experience and inefficient fingerprint identification.
Innovation Solution
A method that captures an initial image of a local region before acquiring a fingerprint image to identify the presence of a fingerprint logo, allowing for precise determination of its disappearance before capturing the fingerprint image, thereby reducing the risk of false identification and FRR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed delay method is used to eliminate the fingerprint logo before capturing the fingerprint image, then the logo elimination is achieved, but the user experience is reduced due to inaccurate timing and extended waiting time
Solution Approach 1:
The system continuously monitors the display screen to detect the real-time presence or absence of the fingerprint logo. This feedback mechanism allows the system to automatically determine when the logo has been eliminated, eliminating the need for fixed delay timing and enabling immediate fingerprint image capture, thus resolving the contradiction between logo elimination accuracy and user waiting time
Solution Approach 2:
The system performs preliminary detection of the fingerprint logo's presence before initiating the fingerprint image capture process. By proactively monitoring and identifying the logo elimination moment in advance, the system prepares the capture timing optimally, avoiding both premature capture (which would include the logo) and excessive waiting (which would degrade user experience)
2Productivity
If the fingerprint logo is not completely eliminated before capturing the fingerprint image, then the capture speed is improved, but the false rejection rate (FRR) increases significantly
Solution Approach 1:
The system uses real-time feedback from display monitoring to detect the exact moment when the fingerprint logo has been completely eliminated. This feedback ensures that fingerprint image capture only occurs when the logo is absent, preventing false rejection while maintaining optimal capture speed by eliminating unnecessary delays
Solution Approach 2:
The patent replaces the traditional mechanical timing-based delay system with an optical detection system that monitors the display screen. This substitution allows for precise, real-time detection of logo elimination, enabling the system to capture fingerprints at the optimal moment without relying on fixed time delays, thus improving both capture speed and reliability
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
Provided are a method and apparatus for identifying a fingerprint logo and an electronic device. Before starting normal fingerprint image capturing, an image of a local region may be firstly captured to determine whether there is a fingerprint logo currently, thereby solving a problem that a fingerprint logo is contained in a fingerprint image, reducing a risk of false fingerprint identification, and meanwhile, reducing FRR. The method for identifying the fingerprint logo includes: acquiring, before an optical sensor captures a fingerprint image, first optical signals captured by the optical sensor in at least one first region respectively, where the first optical signals captured in the at least one first region form a first image, and the at least one first region corresponds to a partial region of a photosensitive surface of the optical sensor (S210); and identifying whether there is a fingerprint logo for guiding a user to perform pressing in the first image according to the first optical signals captured in the at least one first region (S220).