Patent ID: 8855750

Claim:
An optical three-dimensional structure measuring device that directs measurement light in a depth direction of a lamination of a measurement target with a layer structure and that two-dimensionally scans an optical axis of the measurement light to acquire optical three-dimensional structure information of the measurement target, the optical three-dimensional structure measuring device comprising: an optical three-dimensional structure information storing device for storing the optical three-dimensional structure information; a specific layer extracting device for comparing information values of the optical three-dimensional structure information stored in the optical three-dimensional structure information storing device with a predetermined threshold and extracting, as a specific layer area of the measurement target, an area equal to or greater than a predetermined range where the information values of the optical three-dimensional structure information equal to or greater than the predetermined threshold continue; a missing area extracting device for extracting, as missing areas, areas where the information values of the optical three-dimensional structure information are smaller than the predetermined threshold in the specific layer area; a missing area range calculating device for calculating sizes of ranges of the missing areas; and a region-of-interest classifying device for comparing the sizes of the ranges of the missing areas with a plurality of predetermined range determination reference values, and classifying the missing areas into a plurality of types of regions of interest of classes corresponding to the sizes of the ranges of the missing areas, wherein the region-of-interest classifying device compares the sizes of the ranges of the missing areas with a first range determination reference value and a second range determination reference value which are among the predetermined range determination reference values, and the optical three-dimensional structure measuring device further comprising: an attribute adding device for adding the same attribute as the specific layer area to the missing area whose size is less than the first range determination reference value to delete the missing area, and for adding a different attribute from the specific layer area to the missing area whose size is the second range determination reference value or more.