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. 2019 Mar 1;10:209. doi: 10.3389/fpls.2019.00209

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Copyright © 2019 Polder, Blok, de Villiers, van der Wolf and Kamp.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Illustration of the procedure for generating a training image. The figure shows the 722 nm wavelength band. The original image is 500 × 512 (A). This image is then rotated by a random angle uniformly distributed between –10° to 10° (B). Subsequently a randomly positioned rectangle with dimensions 500 × 250 is cropped from the rotated image (C) to produce the training image (D). The procedure for test images is the same, except there is no rotation step and the cropping rectangle is always vertically centered. Ground truth labeling is done on line bases (green – healthy, red – diseased, black – unknown) (E).