Nothing

```
ReadAndCal = function(fname)
{
img <- read.jpeg(fname)
plot(img)
calpoints <- locator(n=4,type='p',pch=4,col='blue',lwd=2)
return(calpoints)
}
ReadImg = function(fname)
{
img <- read.jpeg(fname)
plot(img)
}
DigitData = function(col='red',type='p',...)
{
type <- ifelse(type=='b','o',type)
type <- ifelse(type%in%c('l','o','p'),type,'p')
locator(type=type,col=col,...)
}
Calibrate = function(data,calpoints,x1,x2,y1,y2)
{
x <- calpoints$x[c(1,2)]
y <- calpoints$y[c(3,4)]
cx <- lm(formula = c(x1,x2) ~ c(x))$coeff
cy <- lm(formula = c(y1,y2) ~ c(y))$coeff
data$x <- data$x*cx[2]+cx[1]
data$y <- data$y*cy[2]+cy[1]
return(as.data.frame(data))
}
```

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