Journal
COMPUTERS AND ELECTRONICS IN AGRICULTURE
Volume 164, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compag.2019.104897
Keywords
Yield estimation; Apple detection; Apple counting; Semi-supervised image segmentation; Machine vision; Clustering
Funding
- NSF [1317788]
- USDA NIFA [MIN-98-G02]
- MnDrive initiative
- Div Of Information & Intelligent Systems
- Direct For Computer & Info Scie & Enginr [1317788] Funding Source: National Science Foundation
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platform independent and does not require any specific lighting conditions. Our main technical contributions are (1) a semi-supervised clustering algorithm that utilizes colors to identify apples and (2) an unsupervised clustering method that utilizes spatial properties to estimate fruit counts from apple clusters having arbitrarily complex geometry. Additionally, we utilize camera motion to merge the counts across multiple views. We verified the performance of our algorithms by conducting multiple field trials. Results indicate that the detection method achieves F-l-measure .95-.97 for multiple color varieties and lighting conditions. The counting method achieves an accuracy of 89-98%. Additionally, we report merged fruit counts from both sides of the tree rows. Our yield estimation method achieves an overall accuracy of 91.98-94.81% across different datasets.
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