Cup seam positioning method and paper cup detection system

The invention provides a cup seam positioning method and a paper cup detection system. The cup seam positioning method comprises the following steps: S1, acquiring a cup body image of a paper cup; s2, performing image preprocessing on the cup body image to obtain a cup body gradient image at least comprising cup bottom features or cup mouth features of the paper cup; s3, cup bottom positioning or cup opening positioning is carried out according to the cup body gradient image, and the cup bottom position or the cup opening position of the paper cup is correspondingly determined; s4, performing cup wall positioning on the cup body gradient image according to the cup bottom position or the cup opening position, and determining an annular cup wall area of the paper cup; and S5, scanning the annular cup wall area by using a block gradient scanning algorithm, and determining the cup seam position of the cup body. 本发明提供一种杯缝定位方法与纸杯检测系统。杯缝定位方法包括：步骤S1、获取纸杯的杯体图像；步骤S2、对杯体图像进行图像预处理，以获得至少包含有纸杯的杯底特征或者杯口特征的杯体梯度图像；步骤S3、根据杯体梯度