Mirror Array Light Field Imaging for Low-Light 3D Reconstruction
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Solution Overview
Problem
Conventional plenoptic cameras require significant external lighting to capture light fields, making them impractical for low-light environments, and using large numerical aperture lenses often compromises depth of field and image resolution.
Innovation Solution
A mirror array is used to reflect light towards a lens, allowing for increased light collection and depth of field while capturing a light field, which is then reconstructed into a 3D model using a processor and sensor system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional plenoptic cameras use large numerical aperture lenses to capture light fields, then light collection capability is improved, but depth of field and image resolution deteriorate
Solution Approach 1:
The system segments the light collection function by using multiple small mirrors instead of a single large lens. Each mirror captures light from a specific angular direction and reflects it to the sensor, enabling the system to collect light from multiple angles simultaneously while maintaining sharp focus through computational processing of the segmented light field data.
Solution Approach 2:
The invention transitions from traditional 2D image capture to 4D light field capture by adding two angular dimensions (azimuth and elevation angles). This dimensional expansion allows the system to capture both spatial and angular information, enabling post-capture refocusing and depth extraction without compromising resolution or depth of field.
2Adaptability or versatility
If conventional plenoptic cameras are used in low-light environments, then light field capture is possible, but significant external lighting is required which makes them impractical
Solution Approach 1:
The system uses self-service by capturing photons that naturally emanate from the target object without requiring external illumination. The multiple mirrors passively collect and redirect these photons to the sensor, making the system adaptable to low-light environments while consuming minimal energy, as no active lighting components are needed.
3Loss of information
If traditional photography is used to capture scenes, then bidimensional projection is achieved, but volumetric information and additional dimensions are lost
Solution Approach 1:
The imaging system segments the scene into multiple angular views using an array of mirrors, where each mirror captures light from a specific direction. This segmentation preserves volumetric information by recording the angular distribution of light rays, which can then be reconstructed into 3D models or used for depth extraction without losing spatial information.
Solution Approach 2:
The mirror array acts as an intermediary between the scene and the sensor, transforming the complex task of direct 3D capture into a series of 2D projections from different angles. This intermediary structure enables the system to capture light field data that encodes volumetric information while maintaining a relatively simple optical architecture.
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
The system enables high-quality, low-light imaging with improved depth of field and resolution, suitable for small-scale objects, and can perform one-shot 3D reconstruction in dim environments.
Implementation Method 1
reflecting light from the target object towards a lens using mirror array comprising a plurality of mirrors such that a different view of the target object is visible in each mirror
Implementation Method 2
a lens configured to focus the reflected light
Data Source
AI summary
Systems and method for light field imaging with mirror arrays in accordance with embodiments of the invention are illustrated. One embodiment includes a light field imaging system, including a mirror array where each mirror in the mirror array is positioned to reflect light from a target object towards a lens such that a different view of the target object is visible in each mirror from the viewpoint of the lens. The system further includes a lens configured to focus the reflected light, a sensor configured to capture an image depicting a plurality of reflections of the target object, a processor, and a memory containing a light field imaging application that directs the processor to obtain the captured image, extract a light field of the target object based on the plurality of reflections of the target object, and construct a three-dimensional model of the target object based on the light field.