| Intravenous needles for single use is one of the most easily-consumed products in hospital. Assembling of hand-petal intravenous needles for single use must satisfy with the certain rule: the angle of main plane intravenous needles and hand-petal plane should range from 80 ~100 . Now, Hand-petal of intravenous needles for single use is assembled by hand in China. But there are some shortcomings: a lower efficiency, a high cost and hard to reach a high-standard hygienic requirements.With the developing of image technology, it is also applied in more and more fields. This paper realized the aumotic detection of assembling angle position of intravenous needles by image technology. During the study, this paper designed light with a piece of white paper and halogen lamp to take the images of intravenous needles; analyzed in detail Hu moment invariants of digital image, amended I7 and chose I1 ~ I5 and amended I7 as eigenvector groups; put forward a method of angle recognition based Hu moment invariants; the methods above were employed by VC++, and a prototype system of software is compiled. |
