Monitoring apparatus, monitoring method, monitoring program and monitoring program recorded recording medium readable by computer

A monitoring method performed in a monitoring apparatus having an image taking section which outputs a captured image, said monitoring method comprising the steps of:

• changing an angle of view of the image taking section so that a predetermined monitoring area is divided into a plurality of background areas;
• capturing an image of each background area by the image taking section;
• storing the image of each background area;
• capturing an current image of one background area;
• determining an object area nonexistent at the time of capturing the stored image of said one background area based on the current image of the one background area and the stored image of the one background area;
• and
• changing the angle of view of the image taking section in order to capture an image of a background area adjacent to the one background area when the object area moves from the one background area toward the adjacent background area.

A monitoring apparatus comprising:

• an image taking device which is configured to capture images across a predetermined monitoring area;
• a storage device which is configured to store images captured by the image taking device;
• a control device which is configured to control at least one of a direction and a magnification of the image taking device, said control device being configured in a first mode to capture a plurality of background images across said predetermined monitoring area and to store said plurality of background images in said storage device, each of said plurality of background images covering a corresponding background area within said predetermined monitoring area;
• and
• a detection device which is configured to receive from the image taking device a current image covering a first background area within said predetermined monitoring area, said current image being one that is taken after the corresponding one of said plurality of background images covering said first background area, and to detect in said current image, based on said current image and said corresponding one of said plurality of background images, an object area that was not present in the background image;
• wherein said control device is further configured in a second mode to control at least one of a direction and a magnification of the image takiiig device so as to capture a new image corresponding to a second background area which is adjacent to said first background area when the object area moves from the first background area toward the second background area.

A method of monitoring a monitoring area comprising the steps of:

• capturing a plurality of background images across said predetermined monitoring area, each of said plurality of background images covering a corresponding background area within said predetermined monitoring area;
• storing said plurality of background images;
• capturing a current image covering a first background area within said predetermined monitoring area, said current image being one that is taken after a corresponding one of said plurality of background images covering said first background area;
• detecting in said current image, based on said current image and said corresponding one of said plurality of background images, an object area that was not present in the background image;
• capturing, when an object area detected in said detecting step is determined to be located within the first background area at a peripheral area thereof, a new image corresponding to a second background area which is adjacent to said peripheral area of said first background.