leafa: Calculates area in cm of leaves in an image.

In ozjimbob/ecbtools: Environmental Change Biology Tools

Description

This function takes a scanned colour image file, typically a JPEG, counts the dark pixels and converts them into an area in cm2.

Usage

leafa(file, cutoff = 100, dpi=300)

Arguments

file	Character string for the filename of the image file to be processed.
cutoff	The cutoff value, from 0-255. Pixels with brighness values below this threshold are considered dark.
dpi	DPI (dots per inch) at which the image was scanned.

Value

An area, in cm, of dark pixels in the image.

Author(s)

Grant Williamson <[e-mail]>

See Also

darkpix.dir

Examples

rlogo=system.file("pictures/Rlogo.jpg", package="rgdal")[1]
darkpix(rlogo,cutoff=100,dpi=50)

ozjimbob/ecbtools documentation built on Jan. 18, 2021, 7:39 p.m.