Image surveillance system and method of detecting whether object is left behind or taken away

An image surveillance system comprising:

• a image acquiring unit which receives a current input image;
• and
• an image detecting unit which receives and processes the current input image, and comprises:
• a foreground detecting unit which detects a plurality of foreground regions based on difference between pixel information about a background image and pixel information about a current input image;
• a still region detecting unit which detects a plurality of candidate still regions from among the plurality of foreground regions and selects a true still region by removing a falsely detected still region, from among the plurality of candidate still regions by using information about the candidate still region;
• and
• an object detecting unit which determines whether an object corresponding to the true still region is an object which is left behind or taken away, based on edge information about the true still region,
• wherein the object detecting unit determines that the object is left behind if an edge intensity of the true still region in the current input image increases compared to an edge intensity of the background image in a previous input image, and
• wherein a determining unit determines that the object is taken away if the edge intensity of the true still region in the current input image decreases compared to the edge intensity of the background image in the previous input image.

A method of detecting whether an object is left behind or taken away using an image surveillance system, the method comprising:

• detecting a foreground region based on difference between pixel information about a background image and pixel information about a current input image;
• detecting a candidate still region by clustering foreground pixels of the foreground region and determining whether the candidate still region is a falsely detected still region or a true still region by using information about the candidate still region;
• and
• determining whether an object is left behind or taken away, based on edge information about the true still region,
• wherein the determining whether the object is left behind or taken away comprises:
• determining that the object is left behind if an edge intensity of the true still region in the current input image increases compared to an edge intensity of the background image in a previous input image;
• and
• determining that the object is taken away if the edge intensity of the true still region in the current input image decreases compared to the edge intensity of the background image in the previous input image.