LiDAR Pixel Binning for Crosstalk Compensation
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Solution Overview
Problem
Line scanning LiDAR devices face interference from crosstalk signals due to stray light, which can significantly impact distance measurements, especially in scenes with large differences in signal levels, leading to artifacts in time-of-flight measurements.
Innovation Solution
The control method for a line scanning LiDAR device involves setting different binning configurations for light detection pixels to separate signal contributions and crosstalk contributions, either in the same or disjunct rows of the pixel array, allowing for direct measurement and compensation of crosstalk to improve distance information accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light detection pixel images a predetermined part of the scene, then distance information can be obtained, but crosstalk signal from other regions interferes with the measurement
Solution Approach 1:
The pixel array is divided into first pixels for acquiring signal contribution and second pixels for acquiring crosstalk contribution. This segmentation allows separate measurement of useful signal and interference, enabling crosstalk compensation to improve distance measurement accuracy.
Solution Approach 2:
Second pixels act as intermediary elements that specifically measure crosstalk contribution from stray light. By using these dedicated pixels, the system can quantify and compensate for crosstalk interference that would otherwise corrupt the distance measurements from first pixels.
2Measurement precision
If the scene is illuminated with a line of light, then scanning allows high resolution and detection range, but crosstalk signal from other regions increases
Solution Approach 1:
The pixel array is segmented into first pixels for signal contribution and second pixels for crosstalk contribution. This allows the system to maintain high-resolution line scanning while separately measuring and compensating for crosstalk interference that increases with broader scene illumination.
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 effectively reduces crosstalk interference, enhancing the accuracy of distance measurements by directly measuring and compensating for crosstalk contributions, thereby improving the robustness of the LiDAR device's performance.
Implementation Method 1
In dToF (which may also be known as 'LiDAR-Light Detection And Ranging') devices the distance information is obtained based on a time-of-arrival of light pulses reflected from the scene
Implementation Method 2
a light detection pixel array (e.g., a line array as well), wherein each pixel of the light detection pixel array is a single sensor element (e.g., a SPAD ('Single Photon Avalanche Diode') pixel)
Data Source
AI summary
A control for a line scanning LiDAR device, comprising circuitry configured to: set, for each row of a first set of rows of a light detection pixel array, a first binning of light detection pixels for acquiring a signal contribution of reflected illumination light to obtain distance information; and set, for each row of a second set of rows of the light detection pixel array, a second binning of light detection pixels for acquiring a crosstalk contribution of reflected illumination light to obtain crosstalk information, wherein the first and the second set of rows are either the same or disjunct.