hist.im
From spatstat v1.25-1
by Adrian Baddeley
Histogram of Pixel Values in an Image
Computes and displays a histogram of the pixel values in a pixel image.
The hist
method for class "im"
.
Usage
## S3 method for class 'im':
hist(x, \dots, probability=FALSE)
Arguments
- x
- A pixel image (object of class
"im"
). - ...
- Arguments passed to
hist.default
orbarplot
. - probability
- Logical. If
TRUE
, the histogram will be normalised to give probabilities or probability densities.
Details
This function computes and (by default) displays a histogram
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 hist.im
is a method for the generic
function hist
for the class "im"
.
Any arguments in ...
are passed to hist.default
(for numeric valued images) or barplot
(for factor or
logical images).
For example, such arguments control the axes, and may be used to
suppress the plotting.
Value
- For numeric-valued images, an object of class
"histogram"
as returned byhist.default
. This object can be plotted. For factor-valued or logical images, an object of class"barplotdata"
, which can be plotted. This is a list with components calledcounts
(contingency table of counts of the numbers of pixels taking each possible value),probs
(corresponding relative frequencies) andmids
(graphical $x$-coordinates of the midpoints of the bars in the barplot).
See Also
Examples
X <- as.im(function(x,y) {x^2}, unit.square())
hist(X)
hist(cut(X,3))
Community examples
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