Iris Capture Timing via Dual-Axis Image Position Difference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing iris image capture systems face challenges in accurately determining the position of a target and capturing high-quality iris images without the need for additional sensors, such as distance or proximity sensors, to ensure proper timing and focus.
Innovation Solution
An information processing system that acquires two images with intersecting optical axes, determines the difference in the target's position between the images, and controls the capture of an iris image only when the position difference is within a predetermined range, eliminating the need for separate position detection sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors (distance or proximity sensors) are added to detect target position and ensure proper timing, then the accuracy of iris image capture is improved, but the device complexity increases
Solution Approach 1:
The patent makes the imaging optical system perform multiple functions: it not only captures images for iris recognition but also serves as a position detection system by comparing target positions in images taken at different times. This eliminates the need for separate distance or proximity sensors, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The imaging system serves itself by using its own captured images to determine target position and timing information. The system compares the position of a target in the first image with its position in the second image to determine when the target is at the focal distance, eliminating the need for external sensors.
2Manufacturing precision
If the focusing range is made narrow to improve image quality, then the iris image capture precision is improved, but the adaptability to different target positions deteriorates
Solution Approach 1:
The system performs preliminary position detection by comparing target positions in images captured at different times before actually capturing the iris image. This allows the system to determine in advance when the target is at the optimal focal distance, enabling narrow focusing range to maintain precision while adapting to different target positions through timing control.
Solution Approach 2:
The system uses feedback from comparing target positions in sequential images to control the timing of iris image capture. By continuously monitoring whether the target position difference is within a predetermined range, the system adjusts capture timing to ensure the target is at the focal plane, maintaining both precision and adaptability.
Data Source
AI summary
An information processing system includes: an acquisition unit that acquires a first image and a second image that are captured such that optical axes intersect at a predetermined point; a determination unit that determines whether or not a difference between a position of a target in the first image and a position of the target in the second image is in a predetermined range; and a control unit that performs a control of capturing an iris image of the target in a case where the difference is in the predetermined range. According to such an information processing system, the iris image of the target can be captured at appropriate timing.