De-noising device, de-noising method, and computer-readable medium

A method of reducing false alarms in traffic monitoring by obtaining noise-suppressed trajectory data, comprising:

• determining end coordinates of each of a plurality of trajectories extracted from waterfall data, the waterfall data being acquired by measuring signals from a plurality of sensing portions arranged along a road;
• extending each trajectory by using the end coordinates so that a duration of time of each trajectory becomes a reference duration of time;
• calculating a length of each extended trajectory;
• detecting an outlier trajectory from the plurality of trajectories based on the length of each extended trajectory;
• removing the outlier trajectory from the waterfall data to obtain the noise-suppressed trajectory data;
• and
• performing traffic flow monitoring based on the noise-suppressed trajectory data.

A non-transitory computer readable medium storing a program for causing a computer to perform processes for reducing false alarms in traffic monitoring by obtaining noise-suppressed trajectory data, the processes including:

• determining end coordinates of each of a plurality of trajectories extracted from waterfall data, the waterfall data being acquired by measuring signals from a plurality of sensing portions arranged along a road;
• extending each trajectory by using the end coordinates so that a duration of time of each trajectory becomes a reference duration of time;
• calculating a length of each extended trajectory;
• detecting an outlier trajectory from the plurality of trajectories based on the length of each extended trajectory;
• removing the outlier trajectory from the waterfall data to obtain the noise-suppressed trajectory data;
• and
• performing traffic flow monitoring based on the noise-suppressed trajectory data.