# mean.im

##### Mean and Median of Pixel Values in an Image

Calculates the mean or median of the pixel values in a pixel image.

##### Usage

```
## S3 method for class 'im'
## mean(x, trim=0, na.rm=TRUE, ...)
```## S3 method for class 'im'
## median(x, na.rm=TRUE) [R < 3.4.0]
## median(x, na.rm=TRUE, ...) [R >= 3.4.0]

##### Arguments

- x
A pixel image (object of class

`"im"`

).- na.rm
Logical value indicating whether

`NA`

values should be stripped before the computation proceeds.- trim
The fraction (0 to 0.5) of pixel values to be trimmed from each end of their range, before the mean is computed.

- …
Ignored.

##### Details

These functions calculate the mean and median
of the pixel values in the image `x`

.

An object of class `"im"`

describes a pixel image. See `im.object`

)
for details of this class.

The function `mean.im`

is a method for the generic
function `mean`

for the class `"im"`

.
Similarly `median.im`

is a method for the generic
`median`

.

If the image `x`

is logical-valued, the mean value of `x`

is
the fraction of pixels that have the value `TRUE`

. The median is
not defined.

If the image `x`

is factor-valued, then the mean of `x`

is the mean of the integer codes of the pixel values. The median is
are not defined.

Other mathematical operations on images are supported by
`Math.im`

, `Summary.im`

and `Complex.im`

.

Other information about an image can be obtained using
`summary.im`

or `quantile.im`

.

##### Value

A single number.

##### See Also

`Math.im`

for other operations.

##### Examples

```
# NOT RUN {
X <- as.im(function(x,y) {x^2}, unit.square())
mean(X)
median(X)
mean(X, trim=0.05)
# }
```

*Documentation reproduced from package spatstat, version 1.55-1, License: GPL (>= 2)*