基于紋理特征的網(wǎng)紋哈密瓜分類研究
[Abstract]:Although the output of Hami melon occupies the first place in the world, the competitiveness of international market is weak, the selling price is far lower than other countries, such as Japan and Korea, and the economic benefit is low. The main reason is that the traditional mesh Hami melon appearance quality detection and classification mainly by manual sorting, low efficiency and poor accuracy. With the increasing improvement of image processing technology and computer software and hardware, intelligent machine vision technology has been widely used in the external quality detection of reticulated Hami melon. In this study, three kinds of reticulated cantaloupe, Mi 17 of Xizhou, Jinmi 3 and Wang 86, were studied. According to one of the important external qualities, texture feature, the classification of different varieties and texture grades of Hami melon was carried out. The correlation between the outer texture of Hami melon and the saccharification of the inner center was also preliminarily explored. The main research contents and conclusions are as follows: (1) an image acquisition device for Hami melon is designed and constructed. The device consists of a moving tray, a color CCD camera, a LED light source, a self-made illumination box and a computer, which can obtain a complete and clear picture of Hami melon. In this paper, the necessity of intercepting ROI is analyzed, and a method of ROI interception is introduced. Five different ROI intercepting schemes of 500 脳 500400 脳 400300 脳 300200 脳 200 and 100 脳 100 pixels are compared. Finally, 300 脳 300 pixel ROI images were selected. (2) the classification model of Hami melon varieties based on texture features was established. Using 5 different texture feature analysis methods, 84 texture features were extracted from three varieties of Xizhou Mi 17, Jinmi 3 and 86 Wang. It was found that the 8 texture features extracted by GLCM could effectively distinguish the images of different varieties of Hami melon. The accuracy of prediction set classification is 98.52%. By making corresponding mapping rules, the sample classification of Hami melon was realized, and the result of sample classification reached 100. The experimental results show that the texture features extracted by GLCM can distinguish the images and samples of three varieties of Hami melon with high accuracy and meet the classification requirements of different varieties of Hami melon. (3) A texture classification model of Hami melon based on texture features is established. For the three gradation textures of principal grade, first class and equal class, the classification results of different grade textures based on SFS,GA and mRMR feature selection methods are compared. It is found that the SFS method is the best in reducing the dimension of the combined features, and the number of the selected features is 131.33 and 21 respectively. In addition, the SFS method has the highest classification accuracy for three varieties of Hami melon texture images of different grades, which is 89.44% and 86.67%, respectively. The corresponding mapping rules are defined to realize the classification of Hami melon three-level samples. The classification accuracy of the samples is 91.67 88.33% and 83.33% respectively, which is close to the classification results of the three-level texture images. The experimental results show that the combination of texture features and SFS features can achieve the classification of different texture images and samples of Hami melon. And it has good robustness to different varieties of Hami melon. (4) the correlation between texture features and sugar content of Hami melon is analyzed. Taking 86 king as an example, the correlation between central sugar content and texture grade and texture feature of Hami melon was analyzed. By comparing the prediction results of three modeling methods, PLS,SMLR and PCR, it is found that the best prediction results are obtained by using the PLS saccharification detection model. The correlation coefficients of correction set and cross validation are 0.8804 and 0.7524 respectively. The correlation coefficient of PLS is 0.9476 擄Brix,RMSECV and 1.3403 擄Brix., respectively. The experimental results show that there is a certain correlation between texture features and central saccharification.
【學位授予單位】:浙江大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:S652.1
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