bwimage (version 1.3)

topline: Top line

Description

Line running along the crest of highest black pixel.

Usage

topline(imagematrix, height_size = NA, width_size = NA)

Arguments

imagematrix

The matrix to be analysed.

height_size

Real size of image height (in mm, cm, m, etc..).

width_size

Real size of image width (in mm, cm, m, etc..).

Value

Top line size that cover black pixels

References

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.

See Also

threshold_color

Examples

# NOT RUN {
# 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)

# See the proportion of black pixels (1) below each bush image matrix row
topline(bush_imagematrix,100,100)
# Conclusion: topline size is 785.6 cm.
# }