Light Field Imaging Refocusing via Directional Detection
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Solution Overview
Problem
Imaging devices, such as cameras and microscopes, face limitations in collecting and manipulating light information, leading to issues with focusing and correcting images due to limited light collection and lens aberrations, which are often addressed with bulky and costly corrective optics.
Innovation Solution
The technology detects light with directional information to generate virtual images, allowing for refocusing and correction of images by determining virtual focal planes and using computational methods to re-sort light data, thereby overcoming the limitations of physical optics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional imaging devices are used to capture scenes, then the device structure remains simple, but the ability to focus at different depths and correct lens aberrations is limited
Solution Approach 1:
The patent replaces mechanical/optical focusing mechanisms with computational methods. By capturing light field data with directional information and using algorithms to process this data, the system achieves refocusing at different depths and aberration correction without requiring complex mechanical lens adjustment mechanisms or multiple physical lenses.
Solution Approach 2:
The patent extends traditional 2D imaging to 4D light field imaging by capturing not only the intensity of light at each pixel but also the directional information of light rays. This additional dimensional information enables post-capture refocusing and aberration correction, providing adaptability without increasing physical optical complexity.
2Manufacturing precision
If corrective optics are added to correct lens aberrations, then image quality improves, but the device becomes bulkier, more expensive, and heavier
Solution Approach 1:
The patent substitutes physical corrective optics with computational correction algorithms. By processing the captured light field data to compensate for aberrations, the system achieves high image quality without adding the weight and bulk of additional physical lenses or optical elements.
Solution Approach 2:
The patent creates a computational model of the light field that can be processed to correct aberrations. Instead of using physical copies or additional optical elements, the system uses digital processing of the captured light distribution data to achieve correction, thereby avoiding additional weight.
3Adaptability or versatility
If additional optics are included to enable refocusing and aberration correction, then imaging versatility improves, but the device size and cost increase
Solution Approach 1:
The patent implements a universal light field capture approach that enables multiple imaging functions (refocusing at different depths, aberration correction, angle of view manipulation) from a single optical setup. By capturing the complete light field with directional information, the system achieves multi-functionality without requiring separate optical paths or additional lenses for each function.
Solution Approach 2:
The patent replaces multiple specialized optical components with a single light field capture mechanism combined with computational processing. This substitution achieves the same versatility as multiple optical systems would provide, but with a compact form factor suitable for small-scale applications.
4Loss of information
If most light information is recorded with directional characteristics, then the ability to manipulate light for focusing and correction improves, but the device complexity increases
Solution Approach 1:
The patent performs preliminary capture of complete light field information including directional characteristics in a single shot. By recording all necessary light information upfront with appropriate sensors, the system enables flexible post-capture manipulation without requiring complex real-time processing or multiple measurements.
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 approach enables improved image quality by effectively refocusing and correcting images without the need for additional optics, enhancing depth of field and reducing aberrations, while maintaining a compact and cost-effective design.
Implementation Method 1
Light from the scene is focused upon a physical focal plane and detected, together with information characterizing the direction from which the light arrived at particular locations on the physical focal plane
Implementation Method 2
The directional information is used with the detected light to generate a virtual image, corresponding to one or both of a refocused image and a corrected image
Data Source
AI summary
Image data is processed to facilitate focusing and/or optical correction. According to an example embodiment of the present invention, an imaging arrangement collects light data corresponding to light passing through a particular focal plane. The light data is collected using an approach that facilitates the determination of the direction from which various portions of the light incident upon a portion of the focal plane emanate from. Using this directional information in connection with value of the light as detected by photosensors, an image represented by the light is selectively focused and/or corrected.