| 摘要 |
<P>PROBLEM TO BE SOLVED: To measure accurately a displacement regardless of the focusing state to a measuring object, when measuring the displacement of the measuring object based on a photographed image. <P>SOLUTION: Each center C of a pair of circular marks 81 provided on a label 80 is detected from a photographed image of the label 80, and a distance between each center on the photographed image of the pair of circular marks 81 and a middle point position M between each center C are calculated. A conversion coefficient for converting a displacement on the photographed image into a displacement in an actual space is calculated from the distance between each center on the photographed image of the pair of circular marks 81 and a distance between each center in the actual space. A reference middle point position M1 based on a reference photographed image of the label 80 acquired beforehand is compared with a middle point position M2 after a prescribed time, and a displacement on the photographed image of the middle point position M2 to the reference middle point position M1 is calculated. The calculated displacement is converted into a displacement in the actual space based on the conversion coefficient, to thereby measure the displacement of the label 80. <P>COPYRIGHT: (C)2011,JPO&INPIT |
