Surveillance camera management device, surveillance camera management method, and program
The surveillance areas of cameras registered on a map having a surveillance region set thereon are projected onto the map. The shortest paths between the cameras registered on the map are searched for. Links between the cameras are determined based on the surveillance areas of the cameras projected on the map and the shortest paths between the cameras detected on the map. Unlike a conventional technique by which link information is manually acquired, this technique does not require a surveillance object to walk around so as to be actually captured by all the cameras, and can be applied even in a case where there is congestion in the surveillance region. Accordingly, the load on the user can be reduced.
1. A surveillance camera management device comprising:
a processing device and a memory encoded with instructions that, when executed by the processing device, function as:
a surveillance area projection unit configured to project surveillance areas of a plurality of cameras onto a map having a surveillance region set thereon, the cameras being registered on the map;
a shortest path search unit configured to search for a shortest path between the cameras registered on the map;
a link determination unit configured to determine an inter-camera link relation between the cameras based on the surveillance areas of the cameras projected onto the map and the shortest path between the cameras detected on the map, wherein the link determination unit is configured to determine the inter-camera link relation by determining that a first camera and a second camera are linked to each other when the shortest path traced from the first camera to the second camera reaches one of the second camera and the surveillance area of the second camera without coming into contact with a surveillance area other than the surveillance area of the first camera and wherein the link determination unit is further configured to determine the inter-camera link relation by determining that the first camera and the second camera are not linked to each other when the shortest path traced from the first camera to the second camera reaches the second camera or the surveillance area of the second camera after coming into contact with a surveillance area that is neither the surveillance area of the first camera nor the surveillance area of the second camera; and
an output camera image select unit configured to select an output camera image from among a plurality of camera images based on the inter-camera link relation determined by the link determination unit, wherein each of the surveillance areas corresponds to one of the plurality of cameras and wherein, when there is an overlap region between the surveillance areas of the cameras, the surveillance area projection unit divides the overlap region between the cameras.
2. The surveillance camera management device according to claim 1 , wherein
the link determination unit further calculates a link distance between the cameras determined to be linked to each other.
3. The surveillance camera management device according to claim 2 , wherein,
when the shortest path traced from the first camera to the second camera determined to be linked to each other reaches one of the second camera and the surveillance area of the second camera after exiting the surveillance area of the first camera, the link determination unit determines the link distance between the first camera and the second camera to be a distance from the exit of the surveillance area of the first camera to one of the second camera and the entrance of the surveillance area of the second camera, and,
when the shortest path traced from the first camera to the second camera determined to be linked to each other reaches one of the second camera and the surveillance area of the second camera from the first camera without coming into contact with the surveillance area of the first camera, the link determination unit determines the link distance between the first camera and the second camera to be a distance from a registered position of the first camera to one of the second camera and the entrance of the surveillance area of the second camera.
4. The surveillance camera management device according to claim 1 , wherein
the surveillance area projection unit divides the overlap region between the cameras, taking into account projection accuracy.
5. The surveillance camera management device according to claim 1 , wherein,
when selecting a camera image of a predetermined camera as a camera image to be output to a main monitor, the output camera image select unit selects camera images of a predetermined number of cameras linked to the predetermined camera as camera images to be output to sub-monitors.
6. A surveillance camera management method performed by a computer, the method comprising:
projecting surveillance areas of a plurality of cameras onto a map having a surveillance region set thereon, the cameras being registered on the map;
searching for a shortest path between the cameras registered on the map;
determining an inter-camera link relation between the cameras based on the surveillance areas of the cameras projected onto the map and the shortest path between the cameras detected on the map, wherein the inter-camera link relation is determined by determining that a first camera and a second camera are linked to each other when the shortest path traced from the first camera to the second camera reaches one of the second camera and the surveillance area of the second camera without coming into contact with a surveillance area other than the surveillance area of the first camera and wherein the inter-camera link relation is further determined by determining that the first camera and the second camera are not linked to each other when the shortest path traced from the first camera to the second camera reaches the second camera or the surveillance area of the second camera after coming into contact with a surveillance area that is neither the surveillance area of the first camera nor the surveillance area of the second camera; and
selecting an output camera image from among a plurality of camera images based on the determined inter-camera link relation, wherein each of the surveillance areas corresponds to one of the plurality of cameras and wherein, when there is an overlap region between the surveillance areas of the cameras, the overlap region is divided between the cameras.
7. A non-transitory computer-readable storage device encoded with computer-executable instructions that, when executed by a computer, cause the computer to function as:
a surveillance area projection unit configured to project surveillance areas of a plurality of cameras onto a map having a surveillance region set thereon, the cameras being registered on the map;
a shortest path search unit configured to search for a shortest path between the cameras registered on the map;
a link determination unit configured to determine an inter-camera link relation between the cameras based on the surveillance areas of the cameras projected onto the map and the shortest path between the cameras detected on the map, wherein the link determination unit is configured to determine the inter-camera link relation by determining that a first camera and a second camera are linked to each other when the shortest path traced from the first camera to the second camera reaches one of the second camera and the surveillance area of the second camera without coming into contact with a surveillance area other than the surveillance area of the first camera and wherein the link determination unit is further configured to determine the inter-camera link relation by determining that the first camera and the second camera are not linked to each other when the shortest path traced from the first camera to the second camera reaches the second camera or the surveillance area of the second camera after coming into contact with a surveillance area that is neither the surveillance area of the first camera nor the surveillance area of the second camera; and
an output camera image select unit configured to select an output camera image from among a plurality of camera images based on the inter-camera link relation determined by the link determination unit, wherein each of the surveillance areas corresponds to one of the plurality of cameras and wherein, when there is an overlap region between the surveillance areas of the cameras, the surveillance area projection unit divides the overlap region between the cameras.