Image processing apparatus, monitoring system, image processing method,and program

A monitoring system comprising at least one processor configured to execute instructions to perform:

• calculating an index value indicating a degree of change in a state of a monitoring target in a plurality of captured images, the captured images being captured at different times;
• and
• presenting an indication based on the index value on a first captured image,
• wherein a train is captured in the captured images,
• the degree of change is calculated based on the state of the monitoring target at times when a door of the train opens and when the door of the train closes.

An information processing method executed by a computer comprising:

• calculating an index value indicating a degree of change in a state of a monitoring target in a plurality of captured images, the captured images being captured at different times;
• and
• presenting an indication based on the index value on a first captured image,
• wherein a train is captured in the captured images,
• the degree of change is calculated based on the state of the monitoring target at times when a door of the train opens and when the door of the train closes.