Patent ID: 8494272

Claim:
An image processing device comprising: an image acceptance unit that accepts a first image and a second image; a perimeter measurement unit that automatically measures a perimeter of an object image within the first image or an object image within the second image accepted by the image acceptance unit; an area measurement unit that automatically measures an area of the object image within the first image or the object image within the second image accepted by the image acceptance unit; a first reference area generation unit that generates a first reference area based on the perimeter measured by the perimeter measurement unit and the area measured by the area measurement unit; a second reference area generation unit that generates a second reference area based on the perimeter measured by the perimeter measurement unit and the area measured by the area measurement unit, the second reference area being different from the first reference area; a datum point extraction unit that extracts datum points from the first image and the second image, respectively; a first match judgment unit that makes the datum point extracted from the first image and the datum point extracted from the second image coincide with each other so that the first image and the second image are superimposed and so that the first reference area includes portions of the first image and the second image, and judges whether or not the object image within the first image and the object image within the second image are matched, based on a density of the first image within the first reference area and a density of the second image within the first reference area; a second match judgment unit that makes the datum point extracted from the first image and the datum point extracted from the second image coincide with each other, and that judges whether or not the object image within the first image and the object image within the second image are matched, based on a density of the first image within the second reference area and a density of the second image within the second reference area; and a third match judgment unit that judges whether or not the object image within the first image and the object image within the second image are matched, based on a judgment result obtained by the first match judgment unit and a judgment result obtained by the second match judgment unit.