DIMENSIONING SYSTEM WITH MULTIPATH INTERFERENCE MITIGATION

摘要

A system and method for measuring an item's dimensions using a time-of-flight dimensioning system is disclosed. The system and method mitigate multipath distortion and improve the accuracy of the measurements, especially in a mobile environment. To mitigate the multipath distortion, an imager captures an image of an item of interest. This image is processed to determine an illumination region corresponding item-of-interest's size, shape, and position. Using this information, an adjustable aperture's size, shape, and position are controlled so the light beam used in the time-of-flight analysis substantially illuminates the illumination region without first being reflected.

主权项

1. A time-of-flight (TOF) dimensioning system, comprising:
an illumination subsystem configured to generate and project a light beam along an optical axis toward an item of interest, the light beam's spatial extent in a plane transverse to the optical axis being limited by an adjustable aperture; an imager positioned and configured for capturing images of the item of interest; a TOF sensor subsystem positioned and configured for capturing range images from the light beam as reflected from the item of interest; and a control subsystem communicatively coupled to the adjustable aperture, the imager, and the TOF sensor subsystem, the control subsystem configured (i) to determine, from the captured images, an illumination region corresponding to the item of interest, (ii) to control the adjustable aperture's size, shape, and/or position to conform with the illumination region, and (iii) to determine from the range images an at least approximate dimension measurement of the item of interest.