measuRing (version 0.5.1)

grayDarker: Gray extremes

Description

This function can detect the extremes of the smoothed gray.

Usage

grayDarker(smoothed, 
    origin = 0, darker = TRUE)

Value

vector with the columns in gray matrix corresponding to the extremes (see graySmoothed and linearDetect).

Arguments

smoothed

a data frame with the smoothed gray such as that produced by graySmoothed.

origin

an origin to find the extremes.

darker

logical. If TRUE the function finds the negative extremes. If FALSE the possitive extremes are detected.

Author

Wilson Lara <[e-mail]> [aut, cre] (<https://orcid.org/0000-0003-3527-1380>), Carlos Sierra [aut] (<https://orcid.org/0000-0003-0009-4169>), Felipe Bravo [aut] (<https://orcid.org/0000-0001-7348-6695>)

Examples

## (not run) read one image section:
image1 <- system.file("P105_a.png", package="measuRing")    
## (not run) gray matrix from RGB in image:
gray <- imageTogray(image = image1,ppi = 1000)
## (not run) smoothed gray:
smoothed <- graySmoothed(gray)
## (not run) column numbers of possitive and negative extremes:
posit <- grayDarker(smoothed,darker=FALSE)
nega <- grayDarker(smoothed,darker=TRUE)
str(nega)