| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a blow hole measuring method for evaluating measuring precision in the size, volume, or the like of a blow hole in a three-dimensional blow hole model in the blow hole measuring method by the X-ray CT measurement of a casting. <P>SOLUTION: A plurality of virtual blow holes in a prescribed size are created three-dimensionally in a virtual voxel space in a group of X-ray CT images, and the measuring precision of the blow hole obtained by an actual measurement based on the virtual blow hole is evaluated. The virtual blow hole is assumed to be spherical, a luminance value table is created using a reference sample S1, the distance of voxel coordinates from the center coordinates of the virtual blow hole is obtained S2, a virtual sectional image is created S3, a three-dimensional virtual blow hole model is created S4, and the measuring precision of the three-dimensional virtual model is evaluated in reference to the spherical virtual blow hole S5. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
