Location information identifying method, location information identifying device, and location information identifying program

A location information identifying device comprising:

• an obtaining unit configured to obtain an object image photographed by a first photographing means having a predetermined distortion characteristic, a predetermined distortion being caused on the object image due to the predetermined distortion characteristic;
• a storing unit configured to store a first scale plate image corresponding to an image obtained when a first scale plate, which has a first scale and is arranged so as to be opposed to a second photographing means having the predetermined distortion characteristic at a first distance, is photographed by the second photographing means, and object information of an object which should be located at a preset height;
• an overlapping unit configured to overlap the first scale plate image and the object image with each other;
• a specifying unit configured to specify the object appeared on the object image while referring to the object information;
• a measuring unit configured to measure an image-height between the object, which is appeared on the object image and located at the preset height, and a center of the object image, by using the first scale of the first scale plate image;
• and
• a calculating unit configured to calculate an angle between a horizontal plane and a straight line joining the first photographing means to the object, based on the image-height and the first distance;
• and calculate at least one of a target distance and a horizontal distance between the first photographing means and the object, based on the angle and a height difference between the first photographing means and the object.

A location information identifying program installed on a computer storing an object image photographed by a first photographing means having a predetermined distortion characteristic, a predetermined distortion being caused on the object image due to the predetermined distortion characteristic;

• a first scale plate image corresponding to an image obtained when a first scale plate, which has a first scale and is arranged so as to be opposed to a second photographing means having the predetermined distortion characteristic at a first distance, is photographed by the second photographing means;
• and object information of an object which should be located at a preset height, the program comprising:
• a step for overlapping the first scale plate image and the object image with each other;
• a step for specifying the object appeared on the object image while referring to the object information;
• a step for measuring an image-height between the object, which is appeared on the object image and located at the preset height, and a center of the object image, by using the first scale of the first scale plate image;
• and
• a step for calculating the angle between a horizontal plane and a straight line joining the first photographing means to the object, based on the image-height and the first distance, and calculating at least one of a target distance and a horizontal distance between the first photographing means and the object, based on the angle and a height difference between the first photographing means and the object.