Detection of blemishes and foreign matter on bottles

• Main Authors: Lin, Yuta, 林佑達
• Other Authors: Lin, Sheng-Fuu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/81620410593661611495

碩士 === 國立交通大學 === 電機學院電機與控制學程 === 101 === Taiwan tobacco and liquor corporation (TTL) has recycled and reused their bottles to support carbon reduction policies. Owing to the repeated use, these bottles get more and more abraded, which forces packaging factories to lower the exclusion criteria adopted by their empty bottle inspection (EBI) machines and thus some defective bottles pass this inspection. During the manufacturing process, some problems also occur, such as broken bottles and uncapped bottles. Therefore, factories have to allocate staff for quality control. The long-term strong light the staff is exposed to leads to eye damages while the noise at packaging factories also cause hearing damages to onsite workers. It’s even more frequent that the high-speed transmission of the conveyor belt sometimes makes workers fail in checking; the defective product or product with foreign matter inside get into consumer market, leading to negative images such as customer complaint. This thesis was inspired by reasons described above and aims to automatize the current manual quality control. This major purpose of this thesis is to design a system for detection of blemishes and foreign matter in recycled bottles that have been cleaned. These bottles are placed on a test platform with a camera used to capture bottle images, and these images will be converted into different threshold values binary images, which would be used to determine if the bottles on the platform are defective or if there is foreign matter inside. Finally, features are compared to determine whether a bottle contains foreign matter or is defective. The experimental results show that the proposed method reaches an accuracy rate of 98%