Smoke detection device, method for detecting smoke from a fire, and computer program
The invention relates to a smoke detection device ( 1 ) for detecting smoke ( 7 ) from a fire ( 6 ) in a monitoring area ( 3 ), comprising a camera interface ( 8 ) for receiving an image sequence having chronologically successive individual images from a monitoring camera ( 2 ), wherein the individual images ( 4 ) show the monitoring area ( 3 ), and comprising an evaluating device ( 9 ) for detecting at least one moving object in the monitoring area ( 3 ), wherein the evaluating device ( 9 ) is designed to detect a motion of the at least one moving object from at least two individual images ( 4 ) of the image sequence ( 5 ), characterized by a filter device ( 10 ) for distinguishing the moving object as smoke ( 7 ) or as a non-smoke object on the basis of the motion of the moving object.
1. A smoke detection device ( 1 ) for detecting smoke ( 7 ) from a fire ( 6 ) in a monitoring area ( 3 ), the smoke detection device comprising:
a camera interface ( 8 ) for accepting an image sequence having temporally successive individual images from a monitoring camera ( 2 ), wherein the individual images ( 4 ) show the monitoring area ( 3 ),
an evaluation device ( 9 ) for determining at least one moving object in the monitoring area ( 3 ), wherein the evaluation device ( 9 ) is designed to determine a movement of the at least one moving object from at least two individual images ( 4 ) in the image sequence ( 5 ), and
a filter device ( 10 ) for distinguishing the moving object as smoke ( 7 ) or a non-smoke object on the basis of the movement of the moving object,
wherein the evaluation device ( 9 ) comprises a speed measuring unit for determining a speed v F of the average optical flow ( 16 ) of the moving object and for determining a speed v G of a contour area ( 17 ) of the moving object.
2. The smoke detection device ( 1 ) as claimed in claim 1 , wherein the filter device ( 10 ) comprises a comparison unit ( 11 ), wherein the comparison unit ( 11 ) is designed to (a) detect the moving object as smoke ( 7 ) if v G <v F , (b) to detect the moving object as a non-smoke object if v G >=v F , or both (a) and (b).
3. The smoke detection device ( 1 ) as claimed in claim 1 , wherein the filter device ( 10 ) comprises a comparison unit ( 11 ) having two safety factors b 1 and b 2 with 0<b 1 <=b 2 <1, wherein the comparison unit ( 10 ) is designed to (a) detect the moving object as smoke ( 7 ) if v G <b 1 *v F , (b) to detect the moving object as a non-smoke object if v G >=b 2 *v F , or both (a) and (b).
4. The smoke detection device ( 1 ) as claimed in claim 1 , wherein the average optical flow ( 16 ) of the moving object has an averaged flow direction, and wherein the contour area ( 18 ) is arranged on that side of the moving object which is contrary to the averaged flow direction.
5. The smoke detection device ( 1 ) as claimed in claim 1 , wherein the monitoring area ( 3 ) comprises a base, wherein the contour area ( 17 ) is arranged on that side of the moving object which faces the base.
6. A The smoke detection device ( 1 ) for detecting smoke ( 7 ) from a fire ( 6 ) in a monitoring area ( 3 ), the smoke detection device comprising:
a camera interface ( 8 ) for accepting an image sequence having temporally successive individual images from a monitoring camera ( 2 ), wherein the individual images ( 4 ) show the monitoring area ( 3 ),
an evaluation device ( 9 ) for determining at least one moving object in the monitoring area ( 3 ), wherein the evaluation device ( 9 ) is designed to determine a movement of the at least one moving object from at least two individual images ( 4 ) in the image sequence ( 5 ), and
a filter device ( 10 ) for distinguishing the moving object as smoke ( 7 ) or a non-smoke object on the basis of the movement of the moving object,
wherein the filter device ( 10 ) comprises a turbulence analysis unit ( 12 ) for distinguishing the moving object as smoke ( 7 ) and a non-smoke object on the basis of turbulence in the moving object.
7. The smoke detection device ( 1 ) as claimed in claim 6 , wherein the evaluation device ( 9 ) is designed to determine a first correspondence R 1 of the moving object as a degree of comparison of at least one first image area in a first individual image and in a second individual image ( 4 ), wherein the two individual images ( 4 ) have a temporal spacing dt, and the evaluation device ( 9 ) is designed to determine at least a second correspondence R 2 of the moving object as a degree of comparison of the first image area in the first individual image and in a third individual image ( 4 ), wherein the first individual image ( 4 ) and the third individual image ( 4 ) have a temporal spacing of n*dt, wherein the turbulence analysis unit ( 12 ) comprises two factors c 1 and c 2 with 0<c 1 <=c 2 <1 and is designed to detect the moving object as smoke ( 7 ) if R 2 <c 1 *R 1 and to detect the moving object as a non-smoke object if R 2 >=c 2 *R 1 .
8. The smoke detection device ( 1 ) as claimed in claim 7 , wherein the evaluation device ( 9 ) is designed to normalize the first correspondence R 1 and the second correspondence R 2 with a region of interest (ROI) to a relative first correspondence {tilde over (R)} 1 and a relative second correspondence {tilde over (R)} 2 , and the turbulence analysis unit ( 12 ) comprises two factors d 1 and d 2 with 0<d 1 <=d 2 <1 and is designed to detect the moving object as smoke ( 7 ) if {tilde over (R)} 2 <d 1 *{tilde over (R)} 1 and to detect the moving object as a non-smoke object if {tilde over (R)} 2 >d 2 *{tilde over (R)} 1 .
9. A method using a smoke detection device ( 1 ) according to the invention as claimed in claim 1 , wherein the evaluation device ( 9 ) determines the movement of the moving object in the monitoring area ( 3 ) on the basis of at least two individual images ( 4 ) in an image series of the monitoring area ( 3 ), and the filter device ( 10 ) determines the moving object as smoke ( 7 ) and a non-smoke object on the basis of the movement of the moving object.
10. A non-transitory computer readable media comprising program code for carrying out all steps of the method as claimed in claim 9 when the program is executed by the smoke detection device.
11. The smoke detection device ( 1 ) as claimed in claim 1 , the smoke detection device including a non-transitory computer readable media comprising program code.
12. A smoke detection device ( 1 ) for detecting smoke ( 7 ) from a fire ( 6 ) in a monitoring area ( 3 ), the smoke detection device comprising:
a camera interface ( 8 ) for accepting an image sequence having temporally successive individual images from a monitoring camera ( 2 ), wherein the individual images ( 4 ) show the monitoring area ( 3 ),
an evaluation device ( 9 ) for determining at least one moving object in the monitoring area ( 3 ), wherein the evaluation device ( 9 ) is designed to determine a movement of the at least one moving object from at least two individual images ( 4 ) in the image sequence ( 5 ), and
a filter device ( 10 ) for distinguishing the moving object as smoke ( 7 ) or a non-smoke object on the basis of the movement of the moving object,
wherein the filter device ( 10 ) comprises a turbulence analysis unit ( 12 ) for distinguishing the moving object as smoke ( 7 ) and a non-smoke object on the basis of turbulence in the moving object, and wherein the turbulence is vortices which are shown as temporally and spatially random variations in the individual images.