| 基于SEM图像处理法的冻干马铃薯内部孔隙率表征 |
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| 引用本文： | 刘凤和,李二娜,李丽,岳莲. 基于SEM图像处理法的冻干马铃薯内部孔隙率表征[J]. 干燥技术与设备, 2013, 0(4): 51-56 |
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| 作者姓名： | 刘凤和 李二娜 李丽 岳莲 |
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| 作者单位： | [1]天津科技大学机械工程学院,中国天津300222 [2]内蒙古京能康巴什热电有限公司,中国内蒙古017000 [3]内蒙古华电玫瑰营风电发电有限公司,中国内蒙古010020 |
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| 摘 要： | 基于数字图像处理分析技术,提出一种测量真空冷冻干燥马铃薯内部孔隙结构特征研究的方法。首先采用Photoshop软件确定冻干马铃薯块SEM图像的分割阀值,而后运用MatLab软件进行面积统计,计算真空冷冻干燥马铃薯内部的孔隙率。测试结果表明,冻干马铃薯内部的孔隙率随着尺寸的增大先增大而后减小。同时将图像处理方法与压汞法测试的结果进行比较,发现误差在1 0%-1 3%范围内。经图像处理方法获得1 0mm的马铃薯块在缓慢预冷冻至-30℃时,其冻干后孔隙率最大,约为61%。
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| 关 键 词： | 马铃薯 冷冻干燥 图像处理 压汞法 孔隙率 |
Porosity Determination of Freeze-Dried Potato by Image Processing Method |
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| LIU Fenghe,LI Erna,LI Li,YUE Lian. Porosity Determination of Freeze-Dried Potato by Image Processing Method[J]. , 2013, 0(4): 51-56 |
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| Authors: | LIU Fenghe LI Erna LI Li YUE Lian |
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| Affiliation: | 1 College of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin, 300222, China 2Inner Mongolia Jingneng Thermal Power Co. Ltd. of Kangbashi, Inner Mongolia, 017000, China 3 Inner Mongolia Huadian Rosecamp Wind Power Co. Ltd., Inner Mongolia, 010020) |
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| Abstract: | In this paper, a porosity determination method was proposed for the freeze-dried potato based on the image processing method. The potato was first frozen using different methods and then was vacuum-dried. Scanning Electron Microscope （SEM） photographs were taken for the sliced dried potato and then were converted into the black-white images by image processing. By accumulating the area ratio of the black pixel in the image, the porosity of the freeze-dried potato can be determined. It was found that the porosity varies between 0.28 and 0.61 and the sample size plays a important role in the porosity in this experiment. |
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| Keywords: | Porosity Freeze drying Image processing Potato |
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