digitize {digitize}

digitize an image

Description

digitize an image

Usage

digitize(image_filename, ..., x1, x2, y1, y2)

Arguments

image_filename

the image file you wish to digitze

...

pass parameters col or type to change data calibration points

x1

(optional) left-most x-axis point

x2

(optional) right-most axis point

y1

(optional) the lower y-axis point

y2

(optional) the upper y-axis point

Details

Proceeds in two steps, both of which require user input from the mouse:

1) Read the image in and calibrate it

2) Digitize the data

Calibration points are optionally passed via arguments x1, x2, y1, y2. These **must be named in full** if passed.

If not specified, you are prompted to enter these in the console. Note, you don’t need to choose the end points of each axis, only two points for which you know the x or y return.

Value

a data.frame containing the digitized data

Examples

## Not run: 
tmp <- tempfile()
png(tmp)
plot(rnorm(10) + 1:10, xlab="x", ylab="y")
dev.off()

mydata <- digitize(tmp)

## End(Not run)