Defects Description in Blockboard by Hough Transform and Minimum-Perimeter Polygons
Shuyue Guan, Dawei Qi · International Journal of Advancements in Computing Technology · 2012
The blockboard defects were detected by Hough transform and Minimum-Perimeter Polygons. Xray nondestructive testing system was used to obtain X-ray blockboard images. The rough binary images of blockboard were got from X-ray images. An initial area of the blockboard defect was simplified by Mathematical morphology, and then the edges of the area image were detected by Minimum-Perimeter Polygons (MPP). Large numbers of lines around the boundary were detected by Hough transform. The lines data were processed by the mathematics and computer graphics methods. The results show that the blockboard defects can be described by several certain lines on the screen. And then, the parameters of lines can be obtained by computers easily. Hence, to defects description, the method in this paper is much more convenient and faster than the traditional methods.