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Last data update: 2014.03.03

R: Gray extremes

grayDarker

R Documentation

Gray extremes

Description

This function can detect the extremes of the smoothed gray.

Usage

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

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.

Value

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

Author(s)

Wilson Lara, Carlos Sierra, Felipe Bravo

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)