Movable Microlens Array for Dual-Mode Light Field and 2D Imaging
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Solution Overview
Problem
Existing light field capture devices, such as plenoptic cameras, are unable to switch between light field imaging and conventional 2D imaging modes, limiting their functionality to either 3D imaging or high-resolution 2D imaging.
Innovation Solution
The microlens array (MLA) in front of the image sensor can be optically or effectively turned on or off, allowing the camera to selectively operate as either a 2D imaging camera or a 3D light field camera by changing its position or properties, such as moving it closer to the sensor, using index matching fluids, or employing liquid crystals with adjustable refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the microlens array is positioned at a fixed distance from the image sensor to optimize light field imaging, then angular resolution and refocusing capability are improved, but 2D spatial resolution deteriorates
Solution Approach 1:
The microlens array is made movable relative to the image sensor, transitioning from a fixed position to an adjustable position. The system includes a drive mechanism that allows the MLA to move between a first position for light field imaging and a second position for 2D imaging, enabling dynamic adaptation to different imaging modes based on operational requirements
2Manufacturing precision
If the microlens array is moved closer to the image sensor to improve 2D spatial resolution, then 2D imaging quality is improved, but light field imaging capability deteriorates
Solution Approach 1:
The system employs a movable microlens array that can be dynamically repositioned along the optical axis. A drive mechanism enables the MLA to transition between positions optimized for different imaging modes, allowing the system to switch between high 2D resolution mode (MLA close to sensor) and high angular resolution mode (MLA at optimal distance for light field imaging) based on operational needs
3Device complexity
If a fixed gap separation is used between the microlens array and image sensor, then the device structure is simplified, but dual-mode operation capability is lost
Solution Approach 1:
The fixed gap separation is replaced with a variable separation mechanism. The microlens array is mounted on a movable platform with a drive mechanism that adjusts the distance between the MLA and image sensor. This dynamic adjustment capability enables the system to achieve both light field imaging mode (with appropriate MLA position for angular resolution) and 2D imaging mode (with MLA position for spatial resolution), providing dual-mode operation while maintaining relatively simple device structure
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
This enables the camera to achieve higher 2D spatial resolution while trading off light field imaging capabilities, allowing for dual-mode operation between 2D and 3D imaging modes, enhancing its versatility in applications like mobile camera systems.
Implementation Method 1
Each lens of the MLA images a portion of the exit pupil image from the main lens onto the image sensor as a series of disk images
Implementation Method 2
Each lens of the MLA images a portion of the exit pupil image from the main lens onto the image sensor as a series of disk images
Data Source
AI summary
A dual-mode light field camera or plenoptic camera is enabled to perform both 3D light field imaging and conventional high-resolution 2D imaging, depending on the selected mode. In particular, an active system is provided that enables the microlenses to be optically or effectively turned on or turned off, allowing the camera to selectively operate as a 2D imaging camera or a 3D light field camera.