| 摘要 |
An object is to obtain a focal length of an imaging device with ease at a high speed. In order to achieve the object concerned, an information processing device is configured to include: an image obtaining unit that, with regard to an object in a state where a spatial relationship with an imaging system is kept, obtains a standard image in which the object is imaged by an imaging condition having a known standard focal length, and a reference image in which the object is imaged by an imaging condition having an unknown reference focal length; and a focal length obtaining unit that obtains a value of the reference focal length by performing arithmetic operation processing for scaling a value of the standard focal length by using information of image sizes of the object in the standard image and the reference image.
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