Since 1997, Brickstream has been developing and manufacturing industry-leading 2D and 3D stereo vision sensors.
HOW DOES IT WORK?
FLIR has made 3D stereo vision the most accurate and consistent footfall technology by developing innovative hardware and software packages that include complete stereo processing support – from image correction and alignment to dense correlation-based stereo mapping.
3D stereo vision works in a similar way to 3D sensing in human vision. It begins with identifying image pixels that correspond to the same point in a scene observed by multiple cameras.
The 3D position of a point can then be established by triangulation using a ray from each camera. The more corresponding pixels identified, the more 3D points that can be determined with a single set of images.
Correlation stereo methods attempt to obtain correspondences for every pixel in the stereo image, resulting in tens of thousands of 3D values generated with every stereo image. Each 3D sensor is equiped with 2 cameras.This allows the sensor to calculate 3D depth.
CALIBRATION AND RECTIFICATION
Each and every FLIR Brickstream sensor is factory-calibrated for lens distortion and sensor misalignments to ensure consistency of calibration across all sensors. During the rectification process, epipolar lines are aligned to within 0.05* pixels RMS error.
Calibration and rectification are key to getting high quality disparity images from a 3D sensor and allows for consistent and accurate footfall data gathering between sensors. The sensor design is also specifically designed to protect the calibration against mechanical shock and vibration. Below is a technology workflow of the FLIR Brickstream 3D sensors for calculating 3D stereo height images.