Solid State Imaging Device Iris Authentication Control
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Solution Overview
Problem
Iris authentication systems face challenges in quickly setting optimal imaging conditions such as exposure and shutter speed for efficient iris recognition, leading to delays in the authentication process.
Innovation Solution
A solid state imaging device with a pixel array and an iris authenticator that extracts iris information through photoelectric conversion, allowing for real-time control of imaging conditions like exposure and focus to optimize image capture for iris authentication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional iris authentication systems use separate imaging devices and external processors, then device complexity is reduced, but the speed of setting optimal imaging conditions deteriorates
Solution Approach 1:
The patent combines the imaging function (pixel array) and the iris authentication function (iris authenticator) into a single integrated device. The iris authenticator is built-in within the imaging device, allowing real-time extraction of iris information and immediate feedback for adjusting imaging conditions. This integration eliminates communication delays between separate devices and enables rapid iterative optimization of exposure and focus settings.
Solution Approach 2:
The system implements a feedback mechanism where the iris authenticator extracts iris information from captured images and provides feedback to the imaging condition controller. Based on this feedback, the controller automatically adjusts imaging conditions (exposure time, aperture, focus) to optimize image quality for iris authentication. This closed-loop control enables rapid convergence to optimal settings without manual intervention.
2Measurement precision
If multiple iterations of image capture and analysis are performed to optimize imaging conditions, then accuracy of iris authentication is improved, but time required for authentication increases
Solution Approach 1:
The system performs preliminary actions by initially setting imaging conditions based on pre-stored reference values or typical parameters for iris authentication. This allows the system to immediately capture images and begin authentication processing without waiting for iterative optimization, thereby reducing initial authentication time while maintaining sufficient accuracy.
Solution Approach 2:
The imaging and authentication process operates continuously without interruption. While images are being captured and processed, the system continuously adjusts imaging conditions based on real-time feedback from the iris authenticator. This continuous operation ensures that authentication proceeds without idle time, and optimal conditions are achieved during the authentication process itself rather than in separate preparation phases.
3Productivity
If imaging conditions are manually adjusted to optimize iris capture, then ease of operation is maintained, but productivity of authentication process decreases
Solution Approach 1:
The system performs self-service by automatically adjusting its own imaging conditions without requiring manual intervention. The imaging condition controller monitors the authentication process and autonomously modifies exposure, focus, and other parameters based on real-time feedback from the iris authenticator. This eliminates the need for operators to manually tweak settings while maintaining high authentication productivity.
Solution Approach 2:
The system dynamically changes imaging parameters (exposure time, aperture size, focus distance, illumination intensity) based on real-time conditions and feedback from the iris authentication process. These parameter adjustments are automatically calculated and applied by the imaging condition controller, enabling the system to adapt to varying lighting conditions, subject distances, and iris characteristics without manual input.
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 rapid and accurate setting of imaging conditions, enhancing the speed and accuracy of iris authentication processes by integrating the iris authenticator and imaging condition controller within the device.
Implementation Method 1
image data obtained from the pixel array through photoelectric conversion
Data Source
AI summary
Provided is a solid state imaging device including: a pixel array in which pixels are disposed on a matrix; an iris authenticator that extracts iris information to be used in an iris authentication process, from image data obtained from the pixel array through photoelectric conversion; and an imaging condition controller that performs control to set an imaging condition in obtaining the image data for the iris authentication process, by using information obtained in a process of extracting the iris information.