Non-uniform Depth Mapping via Diffractive Optical Element
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Solution Overview
Problem
Depth mapping systems face limitations in light intensity, optical resolution, and computing power, which restrict their ability to achieve optimal performance in creating accurate 3D maps.
Innovation Solution
The method involves optimizing resource allocation by varying the application of illumination and image capture resources non-uniformly over the volume of interest, including angular modulation of optical radiation intensity and optical distortion of the image capture, to compensate for varying depths and angles, using a configuration that includes a diffractive optical element and an F-theta lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uniform resource allocation is used across the volume of interest, then the system design is simple, but the depth mapping accuracy deteriorates due to varying depths and angles
Solution Approach 1:
The patent applies local quality by allocating illumination intensity and optical resolution non-uniformly across different regions of the volume of interest. Specifically, regions with greater depth or larger angles receive adjusted resource allocation (e.g., higher illumination intensity or modified pattern density) to compensate for the inherent signal degradation, thereby maintaining consistent depth mapping accuracy throughout the entire volume without requiring a completely complex system redesign
Solution Approach 2:
The patent implements dynamic resource allocation where the illumination pattern and optical resolution are adaptively adjusted based on the specific depth and angle characteristics of each region being mapped. This allows the system to optimize performance for varying depths and angles in real-time, improving measurement precision while managing complexity through adaptive rather than static configuration
2Measurement precision
If more light intensity and optical resolution are provided uniformly, then depth mapping accuracy improves, but the resource consumption increases
Solution Approach 1:
Instead of uniformly increasing light intensity and optical resolution across the entire volume of interest, the patent applies these resources locally and non-uniformly. Regions that require better depth mapping accuracy (such as those with greater depth or larger angles) receive enhanced resource allocation, while regions with already good visibility receive standard allocation. This significantly reduces overall energy consumption while maintaining the required measurement precision
Solution Approach 2:
The patent applies partial action by providing enhanced light intensity and optical resolution only to the extent necessary for regions that require it, rather than uniformly across all regions. This selective application of resources improves depth mapping accuracy where needed while avoiding unnecessary resource consumption in regions where standard allocation suffices
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 enhances the accuracy and resolution of depth maps by effectively utilizing available resources, improving the system's performance by adapting to the varying depth and angle-dependent requirements within the volume of interest.
Implementation Method 1
angularly modulating an intensity distribution of the patterned optical radiation projected by the illumination module
Implementation Method 2
optically distorting the image captured by the image capture module
Data Source
AI summary
A method for depth mapping includes projecting a pattern of optical radiation into a volume of interest containing an object while varying an aspect of the pattern over the volume of interest. The optical radiation reflected from the object responsively to the pattern is sensed, and a depth map of the object is generated based on the sensed optical radiation.