公开(公告)号：US11240486B1

公开(公告)日：2022-02-01

申请号：US16894592

申请日：2020-06-05

Applicant: Amazon Technologies, Inc.

Inventor： Bo Chen ,  Venkata Sri Krishnakanth Pulla ,  Junrong Yan

IPC: H04N13/296 ,  H04N13/254 ,  H04N13/271 ,  H04N13/282

Abstract: Discrete frequencies and time slots of operation are assigned to each of a plurality of time-of-flight cameras. Where two time-of-flight cameras having overlapping fields of view, whether the time-of-flight cameras are operating at the same frequency or time slot is determined by calculating ratios of zero-value pixels to total numbers of pixels for each depth image captured by the time-of-flight cameras over a selected interval. If the time-of-flight cameras operate at the same frequency or time slot, a plot of the ratios of depth images captured using one time-of-flight camera is erratically sinusoidal. Another time-of-flight camera causing the interference may be identified among time-of-flight cameras operating at the frequency or time slot, based on areas of interest that overlap with the time-of-flight camera, or based on a time at which the time-of-flight cameras began capturing depth images, as compared to a time at which the interference is observed.

公开(公告)号：US10681338B1

公开(公告)日：2020-06-09

申请号：US16144567

申请日：2018-09-27

Applicant: Amazon Technologies, Inc.

Inventor： Bo Chen ,  Venkata Sri Krishnakanth Pulla ,  Junrong Yan

IPC: H04N13/296 ,  H04N13/282 ,  H04N13/271 ,  H04N13/254

Abstract: Discrete frequencies and time slots of operation are assigned to each of a plurality of time-of-flight cameras. Where two time-of-flight cameras having overlapping fields of view, whether the time-of-flight cameras are operating at the same frequency or time slot is determined by calculating ratios of zero-value pixels to total numbers of pixels for each depth image captured by the time-of-flight cameras over a selected interval. If the time-of-flight cameras operate at the same frequency or time slot, a plot of the ratios of depth images captured using one time-of-flight camera is erratically sinusoidal. Another time-of-flight camera causing the interference may be identified among time-of-flight cameras operating at the frequency or time slot, based on areas of interest that overlap with the time-of-flight camera, or based on a time at which the time-of-flight cameras began capturing depth images, as compared to a time at which the interference is observed.