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Root identification in minirhizotron imagery with multiple instance learning

Journal Article · · Machine Vision and Applications
 [1];  [2];  [2];  [3];  [4];  [4];  [5]
  1. Univ. of Florida, Gainesville, FL (United States); University of Texas at Austin
  2. Univ. of Florida, Gainesville, FL (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Univ. of Missouri, Columbia, MO (United States)
  5. Univ. of Texas, Austin, TX (United States)

In this study, multiple instance learning (MIL) algorithms to automatically perform root detection and segmentation in minirhizotron imagery using only image-level labels are proposed. Root and soil characteristics vary from location to location, and thus, supervised machine learning approaches that are trained with local data provide the best ability to identify and segment roots in minirhizotron imagery. However, labeling roots for training data (or otherwise) is an extremely tedious and time-consuming task. This paper aims to address this problem by labeling data at the image level (rather than the individual root or root pixel level) and train algorithms to perform individual root pixel level segmentation using MIL strategies. Three MIL methods (multiple instance adaptive cosine coherence estimator, multiple instance support vector machine, multiple instance learning with randomized trees) were applied to root detection and compared to non-MIL approaches. The results show that MIL methods improve root segmentation in challenging minirhizotron imagery and reduce the labeling burden. In our results, multiple instance support vector machine outperformed other methods. The multiple instance adaptive cosine coherence estimator algorithm was a close second with an added advantage that it learned an interpretable root signature which identified the traits used to distinguish roots from soil and did not require parameter selection.

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
SC0014156; AR0000820
OSTI ID:
1773853
Journal Information:
Machine Vision and Applications, Journal Name: Machine Vision and Applications Journal Issue: 6 Vol. 31; ISSN 0932-8092
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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