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Position: Home > Articles > Research on Apple Grading Based on the Minimum Circumscribed Circle Diameter Chinese Agricultural Science Bulletin 2015,31 (20) 239-243

基于最小外接圆直径的苹果分级研究

作  者：
刘新庭;匡迎春;陈熵;欧明文;曾文辉
单  位：
湖南农业大学工学院
关键词：
图像处理;最小外接圆直径;苹果分级
摘  要：
苹果大小是苹果品质分级的重要因素之一,为实现苹果的大小分级,针对苹果外形近似球的特点,专门设计了一套基于图像处理的苹果大小分选系统。研究采用30个果径为65~95 mm的苹果,模拟苹果在输送翻转装置上的多种随机姿态,对每个试验样本进行9个不同角度的拍摄,将拍摄的所有图像传送给计算机进行二值化、去噪去斑及边缘处理等预处理,提取苹果果径面图像。根据图像边缘确定苹果的质心,寻求质心与边缘的最远距离则为苹果图像的最小外接圆半径;寻求9个图像中苹果的像素面积与其最小外接圆面积最接近的图像,计算出苹果样本果径面的最小外接圆直径。将苹果的实际大小与系统测量大小进行比较,试验表明,研究分选的正确率为96.67%,为苹果大小自动分选提供参考。
译  名：
Research on Apple Grading Based on the Minimum Circumscribed Circle Diameter
作  者：
Liu Xinting;Kuang Yingchun;Chen Shang;Ou Mingwen;Zeng Wenhui;College of Engineering, Hunan Agricultural University;
关键词：
image processing;;the minimum circumscribed circle diameter;;apple grading
摘  要：
Apple size is an important factor for quality classifying. In order to realize the size grading of apple,a set of apple size sorting system based on image processing was designed according to the ball shapecharacteristic of apple. The study selected 30 apples with the fruit diameters of 65- 95 mm, simulated themultiple random status of the apple in the conveying flip device, took photos for each test sample in nineangles, and transmitted all images to the computer for pretreatment, such as binarization, denoising and edgeprocessing, to draw the diameter of fruit surface of the apple. According to the image edge, apple's centroidwas determined, then the author sought the longest distance between the center and edge as the radius of theminimum circumscribed circles of apple image and the image in which the area between pixel and minimumcircumscribed circle were closest from nine apple images, and calculated the minimum circumscribed circlediameter of surface of fruit diameter in the apple samples. Apples' actual size was compared with themeasuring size, research showed that the separation accuracy was 96.67%. The study could provide a referencefor automatic sorting of apple size.

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