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. 2013 Dec 16;8(12):e82809. doi: 10.1371/journal.pone.0082809

Table 1. Dictionary of variables.

Name of variable Description
Width Mean width of the object
Length Length of the object
rel_width Mean width of the object normalized by the length of the main skeleton of the object
SD_width Standard deviation of the width of the object
Mean-Nrefr15 Average of the number of pixels along the transversal segment to the skeleton that had brightness 15% higher than the average bright of the photograph normalized by the total number of pixels of the particular transversal segment.
bimedia Mean of the brightness values of the pixels in all the transversal segments of an object
Num-tips Number of tips of the complete skeleton.
Mean-for Mean of the squared Euclidean distance between the pixels of the extended trunk and the fitted line.
SD-for Standard deviation of the squared Euclidean distance between the pixels of the extended trunk and the fitted line.
perimeter/length Ratio perimeter:length of the object.
max-width Maximum width of an object.
SD-photo Standard deviation of the brightness of all the pixels within a photograph.
Num-obj Total number of valid objects in the photograph
numposi_object-model-2.1 Number of positive objects detected in a photograph according to the statistical model object-model-2.1 (model under the database of positive cords vs. detritus).
numposi_object-model-2.2 Number of positive objects detected in a photograph according to the statistical model object-model-2.2 (model under the database of positive cords vs. detritus).
Mean-2.1_6 Average of the top six highest probabilities of objects from the analyzed photograph.