Auto Focus Camera System Using Pupil Distance Detection
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Solution Overview
Problem
Conventional electronic devices with camera modules often fail to auto-focus and capture images quickly enough in critical moments, as they require manual operation and may not be readily accessible when needed.
Innovation Solution
An auto-focus photographing system integrated into smart glasses, utilizing two camera modules to detect pupil distance changes, correlating these changes with focus distances to adjust the second camera module's focus, allowing for immediate and accurate image capture upon user command.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If manual operation is used for camera focusing, then the device can be operated with simple structure, but the response time is slow and critical moments may be missed
Solution Approach 1:
The system automatically detects pupil distance through the first camera module and adjusts the second camera module's focus accordingly, eliminating the need for manual operation. The processor autonomously correlates pupil distance changes with focus distances and controls the camera module to capture images, enabling the system to serve itself without user intervention.
Solution Approach 2:
The system continuously monitors and detects pupil distance in advance using the first camera module before image capture is needed. By maintaining real-time awareness of the user's focus state and pre-correlating pupil distance with focus distances, the system is prepared to immediately capture images when triggered, eliminating response delays.
2Ease of operation
If the camera module is kept accessible for quick photography, then image capture speed improves, but the device becomes less wearable and more cumbersome
Solution Approach 1:
The smart glasses integrate multiple functions including vision correction through lenses, photography through the second camera module, and auto-focus control through the first camera module and processor. This multi-functionality eliminates the need for separate dedicated photography devices, making the camera readily accessible while maintaining a wearable form factor.
Solution Approach 2:
The system merges the camera modules directly into the smart glasses frame structure, integrating the photography function with the wearable device. The first and second camera modules are embedded in the glasses, combining vision assistance and photography capabilities in a single unified device that is both wearable and operationally accessible.
3Measurement precision
If auto-focus system with pupil detection is implemented, then focus accuracy improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The first camera module serves as an intermediary that indirectly measures focus distance by detecting pupil distance. Instead of requiring complex direct distance measurement mechanisms, the system uses the easily measurable pupil distance as a proxy indicator, which the processor then correlates with focus distances to achieve accurate auto-focus control.
Solution Approach 2:
The system replaces complex mechanical focus adjustment mechanisms with an optical-electronic solution. The processor uses image processing algorithms to analyze pupil distance from the first camera module and electronically controls the second camera module's focus, substituting mechanical complexity with computational simplicity.
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 auto-focusing and image capture by leveraging pupil distance detection to adjust the camera's focus, ensuring better image quality and timely photography without manual intervention.
Implementation Method 1
The first camera module is configured to capture a distance between centers of eye pupils of a user
Data Source
AI summary
An auto focus photographing system applied in an electronic device that is worn before eyes of a user is provided. The auto focus photographing system includes a first camera module, a second camera module, and a processor. The first camera module captures images of the eyes. The second camera module captures images of objects that the eyes focus on. The processor analyzes a distance between centers of eye pupils of the user and calculates a focusing current value corresponding to the distance, and adjusts a focus distance of the second camera module accordingly. The processor detects a capture command and the second camera module captures an image according to the adjusted focus distance. An electronic device employing the auto focus photographing system is also provided.