Residual Stress Evaluation in Vitreous Enameled Steel Sheets by Digital Images Analysis of Microstructures - Visual Computing: Scientific Visualization and Imaging Systems - page 173

Fig. 9.7 Image of the

coating

Fig. 9.8 Binarized image of
the coating

Fig. 9.9 Vectorized image
of the coating

Once performed the image conversion, a scale transformation is applied to the
image in the graphical format, according to the calibration data. The image
magnification is 1,680 pixel/mm. The result finally obtained is reported in Fig. 9.9 .
It has to be observed that in Fig. 9.9 , the graded layer between the coating and
the metal substrate has been disregarded.
The discretization of the zone with the graded layer between the coating and the
metal substrate required a further analysis. In fact, as previously discussed, the
structure of the graded layer is very complex, also if the extension can be esti-
mated from filtered images of high magnification such as that reported in Fig. 9.10
together with a brightness diagram along with a line.