Find the higher black pixel in the whole image.
The matrix to be analysed.
Real size of image width (in mm, cm, m, etc..).
Height of the highest black pixel. It is scaleted for the real size (in mm, cm, m, etc..) based in the information from argument height_size.
Zehm et al 2003 Multiparameter analysis of vertical vegetation structure based on digital image processing. Flora-Morphology, Distribution, Functional Ecology of Plants, 198: 142-160.
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# First, get a matrix from your image. Here an example of a bush image is used. bush<-system.file("extdata/bush.JPG",package ="bwimage") bush_imagematrix<-threshold_color(bush, "jpeg", "proportional", compress_rate = 0.1) # Calculate height of the highest black pixel in the bush image matrix heigh_maximum(bush_imagematrix,height_size=100) # Conclusions: The highest vegetation unit ,i.e. highest black pixel, is 84.4 cm above ground.
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