topline {bwimage}

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

Author(s)

Carlos Biagolini-Jr.

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

# 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.