Light-Field Camera with Uneven Angular Sampling
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Solution Overview
Problem
Existing plenoptic cameras capture four-dimensional light-field images with relatively low output resolution due to decreased spatial resolution for increased angular resolution, which is inadequate for many applications requiring high-resolution image and depth data.
Innovation Solution
The system captures light-field images with uneven and/or incomplete angular sampling using novel exit pupil shapes and microlens array configurations, such as high aspect ratio exit pupils and non-standard packing patterns, to increase spatial and output resolution, enhance depth data quality, and extend the refocusable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If plenoptic microlens array and single photosensor are used to capture four-dimensional light-field image, then angular resolution is increased, but spatial resolution is decreased significantly
Solution Approach 1:
The patent divides the light-field capture into multiple separate camera units, each capturing a portion of the light-field data. This segmentation allows each camera to maintain high spatial resolution while the collective system achieves comprehensive angular sampling, resolving the contradiction between spatial and angular resolution requirements.
Solution Approach 2:
The patent transitions from a single-camera four-dimensional light-field capture to a multi-camera array where the spatial arrangement of multiple cameras provides the angular dimension. This dimensional transformation allows each camera to operate at full spatial resolution while the array configuration achieves the required angular sampling.
2Measurement precision
If complete and even sampling in two angular dimensions is performed, then light-field data quality is improved, but output resolution and depth data quality are reduced
Solution Approach 1:
The patent applies uneven and incomplete angular sampling strategies where different regions of the light-field data are sampled at different resolutions. This local quality approach allocates higher sampling density to regions critical for depth perception while using lower sampling in regions less critical for the specific application, thereby maintaining output resolution while achieving sufficient angular sampling quality.
3Adaptability or versatility
If spatial resolution is decreased to increase angular resolution, then four-dimensional light-field capture is enabled, but virtual view resolution becomes too low for widespread adoption
Solution Approach 1:
The patent merges multiple high-resolution camera captures into a unified light-field representation. By combining the data from multiple cameras, the system achieves both four-dimensional light-field capture capability and high virtual view resolution, as each camera contributes high-resolution spatial data that collectively provides comprehensive angular information.
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 increases the output resolution and quality of depth data while maintaining or improving the refocusable range, allowing for higher angular sampling and improved image processing without the need for excessive pixel count or complex processing techniques.
Implementation Method 1
a plenoptic microlens array and a single photosensor, containing a two-dimensional (2D) array of pixels, are used
Data Source
AI summary
A light-field camera may generate four-dimensional light-field data indicative of incoming light. The light-field camera may have an aperture configured to receive the incoming light, an image sensor, and a microlens array configured to redirect the incoming light at the image sensor. The image sensor may receive the incoming light and, based on the incoming light, generate the four-dimensional light-field data, which may have first and second spatial dimensions and first and second angular dimensions. The first angular dimension may have a first resolution higher than a second resolution of the second angular dimension.