Table 2.

Evaluation of spike detection

Experiment	Total number of imagesa	Correctb	Incorrectb	Accuracyc (%)
2013	194	168	26	86.6
2014	206	168	38	81.5

^aFor 2013 dataset, we selected the image on the last imaging day for each plant; for 2014 dataset, in order to get more sample images, we took few images for each plant on the last few imaging days

^bManually check whether all the spikes in the image are detected, if all the spikes are recognized, and no any misclassified, we defined as correct; If there is some spikes are not recognized, or misclassified, we defined as incorrect

^c $Accuracy=\frac{N_{correct}}{N_{total}}\times 100\%$