Classification of Kiwifruit Grades Based on Fruit Shape Using a Single Camera

Longsheng Fu; Shipeng Sun; Rui Li; Shaojin Wang

doi:10.3390/s16071012

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Classification of Kiwifruit Grades Based on Fruit Shape Using a Single Camera

Journal article

Open access

Peer reviewed

Classification of Kiwifruit Grades Based on Fruit Shape Using a Single Camera

Longsheng Fu, Shipeng Sun, Rui Li and Shaojin Wang

Sensors (Basel, Switzerland), Vol.16(7), pp.1012-1012

07/01/2016

DOI: https://doi.org/10.3390/s16071012

Handle:

https://hdl.handle.net/2376/107092

PMCID: PMC4970062

PMID: 27376292

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https://doi.org/10.3390/s16071012View

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Abstract

international grading standards

Chinese grading standards

image processing method

fruit shape

kiwifruit grading

This study aims to demonstrate the feasibility for classifying kiwifruit into shape grades by adding a single camera to current Chinese sorting lines equipped with weight sensors. Image processing methods are employed to calculate fruit length, maximum diameter of the equatorial section, and projected area. A stepwise multiple linear regression method is applied to select significant variables for predicting minimum diameter of the equatorial section and volume and to establish corresponding estimation models. Results show that length, maximum diameter of the equatorial section and weight are selected to predict the minimum diameter of the equatorial section, with the coefficient of determination of only 0.82 when compared to manual measurements. Weight and length are then selected to estimate the volume, which is in good agreement with the measured one with the coefficient of determination of 0.98. Fruit classification based on the estimated minimum diameter of the equatorial section achieves a low success rate of 84.6%, which is significantly improved using a linear combination of the length/maximum diameter of the equatorial section and projected area/length ratios, reaching 98.3%. Thus, it is possible for Chinese kiwifruit sorting lines to reach international standards of grading kiwifruit on fruit shape classification by adding a single camera.

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Title: Classification of Kiwifruit Grades Based on Fruit Shape Using a Single Camera
Creators: Longsheng Fu - College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling 712100, China
Shipeng Sun - College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling 712100, China
Rui Li - College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling 712100, China
Shaojin Wang - College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling 712100, China
Publication Details: Sensors (Basel, Switzerland), Vol.16(7), pp.1012-1012
Academic Unit: Biological Systems Engineering, Department of
Publisher: MDPI
Identifiers: 99900546622001842
Language: English
Resource Type: Journal article