Nuro has patented a method and system for calibrating multiple lidar devices on a vehicle to ensure a consistent view of the world. By determining pairs of positions and fields of view overlap, an extrinsic calibration transformation is calculated for accurate data collection. GlobalData’s report on Nuro gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Nuro, AI assisted drone control was a key innovation area identified from patents. Nuro's grant share as of February 2024 was 75%. Grant share is based on the ratio of number of grants to total number of patents.
Calibration method for lidar devices on a vehicle
A recently granted patent (Publication Number: US11921239B2) discloses a method for calibrating multiple lidar devices mounted on a vehicle to ensure a consistent view of the surrounding environment. The method involves determining pairs of vehicle positions where the fields of view of different lidar devices overlap, allowing for the extrinsic calibration transformation of the second lidar device to achieve a calibrated position. By analyzing subsets of pairs of positions and estimating transformations between lidar returns recorded by each device, the calibration process aims to minimize errors and optimize the alignment between the devices for accurate perception of the world.
Furthermore, the patent includes details on how the calibration method is implemented using a non-transitory computer-readable storage medium and a processor to execute the necessary operations. The computing device determines pairs of vehicle positions along a predefined path pattern, where the fields of view of the lidar devices intersect, facilitating the extrinsic calibration transformation. By generating bounding boxes representing the fields of view and ensuring their overlap meets a predetermined threshold, the method effectively selects pairs of positions for calibration. This innovative approach to lidar device calibration offers a systematic and efficient solution for enhancing the accuracy and consistency of data collected by multiple sensors on a moving vehicle.
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