Evaluation apparatus, evaluation method, and non-transitory storage medium

Abstract

An evaluation apparatus ( 10 ) includes an acquisition unit ( 110 ), an index computation unit ( 120 ), and a suitability computation unit ( 140 ). The acquisition unit ( 110 ) acquires arrangement information and environmental information. The arrangement information indicates at least any of position, orientation and field angle of an image capturing apparatus. The environmental information indicates an environment of a target region. The index computation unit ( 120 ) computes a surveillance index by using the arrangement information and the environmental information, the surveillance index indicating difficulty or easiness of surveilling a target object. The suitability computation unit ( 140 ) computes suitability of arrangement of the image capturing apparatus indicated by the arrangement information, based on the distribution of the surveillance index in the target region.

1 . A surveillance apparatus, comprising:
 at least one memory configured to store one or more instructions; and   at least one processor configured to execute the one or more instructions to:   acquire environmental information indicating an environment of a target region,   compute a surveillance index based on the environmental information, the surveillance index indicating difficulty or easiness of surveilling a target object, and   generate arrangement information of an image capturing apparatus based on the environmental information.   
     
     
         2 . The surveillance apparatus according to  claim 1 ,
 wherein the processor is further configured to execute the one or more instructions to:   acquire condition information indicating a condition regarding arrangement of the image capturing apparatus; and   generate the arrangement information of the image capturing apparatus based on the condition information and the environmental information.   
     
     
         3 . The surveillance apparatus according to  claim 1 ,
 wherein the processor is further configured to execute the one or more instructions to select one or more pieces of the arrangement information from among the plurality of pieces of arrangement information based on the surveillance index.   
     
     
         4 . The surveillance apparatus according to  claim 1 , further comprising:
 one or more image capturing apparatuses located at one or more positions indicated by the arrangement information generated based on the surveillance index.   
     
     
         5 . The surveillance apparatus according to  claim 1 ,
 wherein the processor is further configured to execute the one or more instructions to control arrangement of the image capturing apparatus based on the arrangement information.   
     
     
         6 . The surveillance apparatus according to  claim 1 ,
 wherein the processor is further configured to execute the one or more instructions to:   obtain arrangement of the image capturing apparatus for each of a plurality of time ranges, and   control the arrangement of the image capturing apparatus for each time range.   
     
     
         7 . The surveillance apparatus according to  claim 1 ,
 wherein the processor is further configured to execute the one or more instructions to:   obtain arrangement of the image capturing apparatus at a plurality of timings based on a predetermined condition, and   control the arrangement of the image capturing apparatus every time obtaining the arrangement of the image capturing apparatus.   
     
     
         8 . The surveillance apparatus according to  claim 1 , wherein
 the environmental information indicates at least any of a shape of the target region, a size of the target region, a position of an object placed in the target region, a shape of the object, a size of the object, and an orientation of the object.   
     
     
         9 . The surveillance apparatus according to  claim 1 ,
 wherein the processor is further configured to execute the one or more instructions to compute the surveillance index based on at least any of a size, brightness, a hiding degree of the target object captured by the image capturing apparatus in a case where the target object is located at each of the plurality of positions in the target region.   
     
     
         10 . The surveillance apparatus according to  claim 1 ,
 wherein the processor is further configured to execute the one or more instructions to:   specify one or more surveillance-unsuitable regions in which it is difficult to surveil the target object by the image capturing apparatus, based on distribution of the surveillance index in the target region,   obtain a length of a route in a case where the target object passes through the surveillance-unsuitable region, for each of the surveillance-unsuitable regions, and   compute the suitability based on the length of the route.   
     
     
         11 . The surveillance apparatus according to  claim 10 ,
 wherein the processor is further configured to execute the one or more instructions to:   acquire information indicating a speed of a movement of the target object,   compute a transit time taken for the target object to pass through the surveillance-unsuitable region, based on the length of the route and the information indicating the speed of the target object, and   compute the suitability based on the transit time.   
     
     
         12 . The surveillance apparatus according to  claim 1 ,
 wherein the processor is further configured to execute the one or more instructions to:   acquire information indicating a direction of a movement of the target object, and   compute the surveillance index on the assumption that, as the direction of the movement of the target object becomes closer to a direction toward the image capturing apparatus, it is easier to surveil the target object.   
     
     
         13 . The surveillance apparatus according to  claim 1 ,
 wherein the processor is further configured to execute the one or more instructions to:   acquire information indicating density of a plurality of the target objects, and   compute the surveillance index on the assumption that, as the density of the plurality of the target objects becomes higher, it is more difficult to surveil the target object.   
     
     
         14 . The surveillance apparatus according to  claim 1 , wherein
 the environmental information includes information indicating that there is an elongated passage in the target region,   the image capturing apparatuses are arranged so that the orientations of the image capturing apparatuses coincide with each other in the elongated passage.   
     
     
         15 . The surveillance apparatus according to  claim 1 , wherein
 the environmental information includes information indicating that there is an elongated passage in the target region,   two image capturing apparatuses are arranged in directions opposite to each other in a vicinity of a center of the elongated passage,   an image of at least a region directly below one image capturing apparatus is captured by the other image capturing apparatus of the two image capturing apparatuses, and   an image of at least a region directly below the other image capturing apparatus is captured by the one image capturing apparatus.   
     
     
         16 . The surveillance apparatus according to  claim 1 , wherein
 the image capturing apparatus is placed so that a first region and a second region are not directly adjacent to each other and not adjacent to each other with only a blind spot region interposed between the first region and the second region,   the first region is a region in which difficulty of surveillance indicated by the surveillance index is higher than a predetermined reference or easiness of the surveillance indicated by the surveillance index is lower than the reference,   a first image capturing apparatus captures an image of the target object in a case where the target object is placed in the first region,   the second region is a region in which the difficulty of the surveillance indicated by the surveillance index is higher than the reference or the easiness of the surveillance indicated by the surveillance index is lower than the reference,   a second image capturing apparatus located within a predetermined range from the first image capturing apparatus captures the image of the target object in a case where the target object is placed in the second region, and   any of the one or more image capturing apparatuses does not capture an image of at least a portion of the target object when the target object is placed in the blind spot region.   
     
     
         17 . The surveillance apparatus according to  claim 1 , wherein
 the environmental information includes information indicating that a rectangular region is in the target region, and   the image capturing apparatus is placed near a point closer to a center than to an end of a long side of the rectangle.   
     
     
         18 . The surveillance apparatus according to  claim 1 , wherein
 the environmental information includes information indicating that a plurality of passages interposing one or more objects arranged in the target region are substantially in parallel in the target region,   one image capturing apparatus is provided for each of the plurality of passages, and   the image capturing apparatuses are arranged so that images of adjacent passages are captured from different directions.   
     
     
         19 . A surveillance method executed by a computer, the method comprising:
 acquiring environmental information indicating an environment of a target region,   computing a surveillance index based on the environmental information, the surveillance index indicating difficulty or easiness of surveilling a target object, and   generating arrangement information of an image capturing apparatus based on the environmental information.   
     
     
         20 . A non-transitory storage medium storing a program causing a computer to:
 acquire environmental information indicating an environment of a target region,   compute a surveillance index based on the environmental information, the surveillance index indicating difficulty or easiness of surveilling a target object, and   generate arrangement information of an image capturing apparatus based on the environmental information.