Measurement and Study on Drying Shrinkage Characteristic of Tobacco Lamina Based on Computer Vision
Accurate evaluation of shrinkage characteristic for tobacco lamina during drying process is important for optimizing tobacco primary process. The present work developed a detection and characterization method of shrinkage characteristic based on computer
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1 Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou 450001, China Institute of Agricultural Products Processing, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China 3 Jinan Cigarette Factory, Jinan 250104, China {wkzhu79,dlxu88}@163.com, {zgwang1999,djsdxx}@126.com
Abstract. Accurate evaluation of shrinkage characteristic for tobacco lamina during drying process is important for optimizing tobacco primary process. The present work developed a detection and characterization method of shrinkage characteristic based on computer vision. Effect of types and dimensions of tobacco lamina on the shrinkage characteristic were investigated and shrinkage rate variation at different drying stages was also analyzed by this method. The results show that percentage reduction of area, which is obtained by detecting tobacco lamina area before and after drying, can be used to reflect the shrinkage characteristic of tobacco lamina. RSD of measurement results by this method is less than 6% under test conditions. Compared with upper tobacco leaf, middle tobacco leaf shows the higher shrinkage rate of 14.3%. Dimensions of tobacco lamina also have significant effect on its shrinkage characteristic. The larger size (up 30mm mesh) tobacco lamina shows a higher shrinkage rate. Shrinkage rate of tobacco lamina is closely related to moisture content variation during drying. The shrinkage of tobacco lamina during drying mainly occurs within the moisture content range of 20% to 14%. Keywords: measurement, shrinkage characteristic, tobacco lamina, computer vision.
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Introduction
Agricultural products processing widely involve the dehydration of materials by air drying. During drying process, one of the most common physical changes is the shape shrinkage, which is associated with the stresses caused by loss of water and heating in the pore structure of materials. Many literatures have reported drying shrinkage characteristics on various porous plant-based materials, such as vegetable, fruit, seeds and so on [1-7]. Due to the flexible skeleton structure of plant leaf, tobacco leaf as important economic crops is easier to shrinkage during drying in its primary process. In the tobacco primary process, post-harvest tobacco leaf need to be broken into lamina, and then tobacco lamina is dehydrated by hot air drying. The area distribution *
Corresponding authors.
D. Li and Y. Chen (Eds.): CCTA 2013, Part I, IFIP AICT 419, pp. 306–314, 2014. © IFIP International Federation for Information Processing 2014
Measurement and Study on Drying Shrinkage Characteristic of Tobacco Lamina
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of tobacco lamina after drying is key quality index in tobacco primary processing, while which is directly affected by its shrinkage characteristic during drying. Therefore, accurate evaluation of tobacco lamina shrinkage characteristic is important for optimizing tobacco primary process. Generally, traditional sieving method is used to measure the distribution of tobacco lamina size before and after drying, then the difference of twice sieving resu
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