Shape measuring method and shape measureing device

摘要

The purpose of the present invention is to not only decrease the time required to detect an optical section line in an optical sectioning method but to improve precision in shape measurement of an object to be measured. In this shape measuring method, after an area dividing line is drawn in a region that includes an extracted optical section line and the region is divided into small areas, a longitudinal region is established that spreads in the up and down direction by a plurality of pixels centered around the location of the optical section line in each small area. The next image processing occurs in the whole region of the longitudinal regions.

主权项

1. A shape measuring method, comprising
a step of determining an area from which a light-section line is extracted, the step of determining the area comprising: extracting a light-section line from reflected light of slit light projected onto an object with a stereoscopic shape moving in a predetermined direction; determining areas in which an image processing is performed by:
drawing N area division lines (N is an integer greater than or equal to 1) in a region including the extracted light-section line, to divide the region into (N+1) small areas, the area division lines extending in the predetermined direction;sequentially, setting longitudinal regions, each extended in the predetermined direction by an amount corresponding to a predetermined number of pixels, with a position of the light-section line present in a corresponding one of the small areas at a center thereof; andsequentially, performing the image processing in an overall region of the longitudinal regions provided for each of the small areas, the longitudinal regions being set in the setting step, measuring the stereoscopic shape of the object based on the light-section line; and sequentially, determining a next area in which a next image processing is performed based on a location and a shape of the extracted light-section line.