Changchun B Li

US Patent:

20230034492, Feb 2, 2023

Filed:

Jul 20, 2021

Appl. No.:

17/380136

Inventors:

- Wilmington MA, US
Changchun Li - Concord MA, US

International Classification:

G01S 7/497
G01S 17/931

Abstract:

A system for determining pose of a lidar sensor in an environment in order to calibrate the lidar sensor. The system includes at least two calibration boards, each having a first edge and a second edge. There is a controller coupled to the lidar sensor to cause the lidar sensor to direct a lidar scan at the calibration boards. The controller causes the lidar sensor to receive a reflection of the lidar scan from the calibration boards and determine locations of a first crossing point on the first edge and a second crossing point on the second edge of the calibration boards. The controller determines a reference plane defined by the first and second crossing points of each of the calibration boards, performs a plane transform of the reference frame to obtain a lidar sensor plane and determine from the lidar sensor plane a pose of the lidar sensor.

US Patent:

20190392222, Dec 26, 2019

Filed:

Sep 5, 2019

Appl. No.:

16/561419

Inventors:

- Boca Raton FL, US
Changchun Li - Concord MA, US

International Classification:

G06K 9/00
G06T 7/11
G06T 7/246

Abstract:

A system and method for analysing queues in frames of video enables operators to preferably draw three regions of interest overlaid upon the video as short, medium, and long queue regions that form a notional queue area within the video. The regions are drawn with knowledge of, or in anticipation of, foreground objects such as individuals and vehicles waiting for service in a queue. Examples include retail point of sale locations or for automated teller machine (ATM) transactions. In conjunction with a video analytics system that analyses the movement of the foreground objects relative to the queue regions, the system determines the number of objects occupying each queue region, length of the queue, and other queue-related statistics. The system can then create reports and send messages that include the queue analysis results for directing operators to change their staffing resources as part of a real-time queue servicing and optimization response.

US Patent:

20180218223, Aug 2, 2018

Filed:

Mar 29, 2018

Appl. No.:

15/939452

Inventors:

- Boca Raton FL, US
Changchun Li - Concord MA, US

International Classification:

G06K 9/00
G06T 7/246
G06T 7/11

Abstract:

A system and method for analysing queues in frames of video enables operators to preferably draw three regions of interest overlaid upon the video as short, medium, and long queue regions that form a notional queue area within the video. The regions are drawn with knowledge of, or in anticipation of, foreground objects such as individuals and vehicles waiting for service in a queue. Examples include retail point of sale locations or for automated teller machine (ATM) transactions. In conjunction with a video analytics system that analyses the movement of the foreground objects relative to the queue regions, the system determines the number of objects occupying each queue region, length of the queue, and other queue-related statistics. The system can then create reports and send messages that include the queue analysis results for directing operators to change their staffing resources as part of a real-time queue servicing and optimization response.

US Patent:

20160180173, Jun 23, 2016

Filed:

Dec 18, 2014

Appl. No.:

14/575567

Inventors:

- Boca Raton FL, US
Changchun Li - Concord MA, US

International Classification:

G06K 9/00
G06T 7/20
G06T 7/00

Abstract:

A system and method for analysing queues in frames of video enables operators to preferably draw three regions of interest overlaid upon the video as short, medium, and long queue regions that form a notional queue area within the video. The regions are drawn with knowledge of, or in anticipation of, foreground objects such as individuals and vehicles waiting for service in a queue. Examples include retail point of sale locations or for automated teller machine (ATM) transactions. In conjunction with a video analytics system that analyses the movement of the foreground objects relative to the queue regions, the system determines the number of objects occupying each queue region, length of the queue, and other queue-related statistics. The system can then create reports and send messages that include the queue analysis results for directing operators to change their staffing resources as part of a real-time queue servicing and optimization response.