关键词: 口服液灯检机, 高精度杂质检测, 尺度不变特征检测（SIFT）, 位置配准

Abstract: In the light inspection machine system for oral liquid impurity detection, due to slight vibration of oral liquid bottle caused by sudden halt of crawler belt used for bottle spinning, in the sequential two pictures of oral liquid bottle captured from high-speed industry camera, pixels sharing the same partial positions cannot be overlapped, which may lead to incorrect result after differential operation of the two pictures. For impurity in oral liquid is very small about micrometer level, mechanical dithering or dirt on the bottle of oral liquid shall pose influence on inspection accuracy because of aforementioned reason. This paper will harness SIFT algorithm to register the sequential two pictures. SIFT algorithm is suitable for high accuracy oral liquid impurity detection system on account of its stability. It improves SITF a little in the aim of adapting to slight vibration range which will generate satisfactory result. In the real process of detection, the algorithm is of high stability and high accuracy.

Key words: light inspection machine for oral liquid, high-accuracy impurity detection, Scale Invariant Feature Transform（SIFT）, position registration