IMAGING-BASED METHODS FOR DETECTING AND MEASURING DEFECTS IN EXTRUDED CELLULAR CERAMIC ARTICLES

摘要

Imaging-based methods for detecting defects in an extruded cellular ceramic article having a web array are disclosed. The methods may include capturing a digital image of the web array to establish an intensity-based initial web array representation. The methods also may include performing an intensity threshold process on the initial web array representation to define an intensity-based high-resolution web array representation having sub-pixel resolution, and performing piecewise cubic spline fits to define corresponding web skeletons. The method may also include comparing intensities of the high-resolution web array representation along the web skeletons to a threshold intensity to determine the defect locations and sizes. The methods can be applied to determining the size and location of skin defects as well.

主权项

1. A method of inspecting an extruded cellular ceramic article for defects, the extruded cellular ceramic article having a web array comprising webs that define an array of cells, the method comprising:
establishing, from a digital image that comprises pixels each having an intensity value, an intensity-based initial web array representation of the web array that does not have sub-pixel resolution; performing an intensity threshold process on the initial web array representation to define an intensity-based high-resolution web array representation of the web array that has sub-pixel resolution; defining corresponding web skeletons for each of the webs by applying piecewise cubic spline fits between knot locations; and comparing intensities of the high-resolution web array representation along the web skeletons to a threshold intensity to determine the location and the size of any defects that may be present in or on the article.