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Research of Orange Quality Classification Technology Based on Computer Vision

Author: QianChunHua
Tutor: GongShengRong
School: Suzhou University
Course: Software Engineering
Keywords: Citrus grading Fourier descriptors BP neural network Gabor wavelet SVM
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 59
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Abstract


Citrus fruit quality grading is an important part of its premarket after picking . Most of our fruit grading manually , can not guarantee the citrus grading treatment effect . Therefore, the application of computer vision technology to achieve automatic detection and classification of quality of citrus is of great significance . In this paper , Suzhou Dongshan citrus , as the research object , on the basis of image pre-processing of citrus , focus on the application of computer vision technology to achieve the citrus quality grading technology process and specific implementation method , to include of citrus objects and eigenvalue extraction method , classification algorithms. Research reflected in this article : (1 ) differential operator in the analysis of the edge detection of several sub on the basis of the characteristics of citrus image , design citrus image segmentation method based on Canny operator . On this basis , combined with the human visual characteristics , design method based on Fourier descriptors citrus shape characterization method based on the color characteristics of the HIS model description . The experiments show that using Canny operator has a large signal-to-noise ratio , high detection accuracy and computational advantages ; HIS model more in line with the human visual system , based on Fourier descriptors citrus shape eigenvalue easy to shape classification and recognition . ( 2 ) for the analysis of the number of iterations of traditional BP neural network algorithm more calculated and complex problems , designed to optimize the parameters of BP neural network algorithm , the characteristic values ??of the color and shape as the input , the citrus is divided into superior , first-class , second-class and endures four grades. The experimental results show that the classification accuracy rate of 95 % . ( 3) design based on Gabor wavelet texture feature extraction and the PCA fusion of SVM citrus grading method . This method first used Gabor wavelet transform direction and scale factor generated basis functions , and extracted texture features described ; then adopt the PCA method of dimension reduction , the formation of texture features optimized value ; based on SVM algorithm citrus classification . Experimental proof : airspace based on the BP neural network algorithm citrus color, shape characteristics the classification results wavelet domain citrus the texture characteristics grading results based on SVM algorithm integrated conduct simple weight grading classification correct rate higher , reach 97.5%.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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