Extract Subimage

subImage extracts a portion of an Image and returns it as an Image object.

Usage

subImage(image, x, y, width, height, target = "new")

Arguments

image

An Image object.

x, y

The coordinates of the bottom-left corner of the subimage within the original image.

width

The width of the subimage. Ignored if target is an Image object.

height

The height of the subimage. Ignored if target is an Image object.

target

The location where the results should be stored. It can take 2 values:

"new":

a new Image object is created and the results are stored inside (the default).

An Image object:

the results are stored in another existing Image object. This is fast but will replace the content of target. Note that if target does not have the same number of channels and bit depth as image, an error will be thrown.

Value

If target="new", the function returns an Image object. If target is an Image object, the function returns nothing and modifies that Image object in place.

See also

Image

Author

Simon Garnier, garnier@njit.edu

Examples

balloon <- image(system.file("sample_img/balloon1.png", package = "Rvision"))
balloon_sub <- subImage(balloon, 290, 170, 150, 150)