In addition to the fibre diameter and length, the number of visible fibre extremities of each fibre is also recorded. The reference standard for both diameter and length measurements is the manual measurement. In other words, it is the segmentation step which is most important, not the measurement step. To present meaningful comparisons between human and automated measurements, we have correlated the diameter class frequencies of several histograms as given by the automated method with the same diameter class frequencies obtained by manual measurements. Both manual and automated measurements were made from the same images of a variety of MMVF products.
Results improve when resolution is increased.
A similar correlation can be obtained for length measurements. We have outlined an entirely automated method for measuring the diameter and length of man-made vitreous fibres. This method is in use in actual production plants for quality control and process development purposes. This is much faster and just as accurate as manual measurements. Thesis, Ecole des Mines de Paris.