Patent ID: 11966226
Assignee: LG ELECTRONICS INC.
Field: Control (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The delivery robot of claim 1, further comprising:
a storage device including information on a time period required for the revolving door to rotate by a preset angle based on an angular speed for each number of revolutions per minute of the revolving door,
wherein the controller is further configured to:
calculate a time difference between a time point at which a distance on the image between the edge of the door blade at either one of left and right sides of the rotation shaft has a maximum value and a time point at which the distance on the image between the edge of the door blade at the either one of left and right sides of the rotation shaft has a minimum value,
calculate a number of revolutions per minute of the revolving door based on information on the time difference and the required time period,
calculate estimated required time periods for each one rotation of revolving doors having different door blades according to a number of times a change pattern of the distance on the image between the edge of the door blade and the rotation shaft is repeated at either one of the left and right sides of the rotation shaft, and
estimate the number of door blades of the revolving door based on any one of the estimated required time periods corresponding to a time period required for one rotation of the revolving door calculated based on the number of revolutions per minute.