ABSTRACT
Structural light measuring method (Yuan. 2006) is the more popular and highly used means of measuring at present. Point structural light method is the simplest and most basic method (Yu et al. 1997), however, it suers from some disadvantages, which will be discussed in details. First, point-by-point scanning must be performed in order to get the shape information on the entire blade surface. Second, the three-dimensional coordinate of each point is determined by the above formula, and thus the calculation burden increases. Last but not the least, it results in sharp increased time in image acquisition time and processing capacity and long time of image processing time, which in turn seriously aect the measuring eciency. These drawbacks can be overcome by linear structural light measurement method. In such a method, since the point becomes the line, the information for all the points on this line can be obtained by scanning the blade surface. Compared to the point structural light method, the measuring eciency has been greatly improved. However, the line light source must constantly change the projection angle so that
the surface of the entire blade within the field of view can be scanned and many images can be taken. Through this, the three-dimensional coordinates of all points are obtained. Therefore, the measurement e- ciency still needs to be improved.
