crop an image — cropImage • OpenImageR

crop an image

Usage

cropImage(image, new_width, new_height, type = "equal_spaced")

Arguments

image: matrix or 3-dimensional array where the third dimension is equal to 3
new_width: Corresponds to the image-rows. If 'equal_spaced' then the new_width should be numeric of length 1. If 'user_defined' then the new_width should be a sequence of numeric values.
new_height: Corresponds to the image-columns. If 'equal_spaced' then the new_height should be numeric of length 1. If 'user_defined' then the new_height should be a sequence of numeric values.
type: a string specifying the type ('equal_spaced' or 'user_defined'). If 'equal_spaced' the image will be cropped towards the center (equal distances horizontaly and verticaly). If 'user_defined' the user specifies the cropped region.

Value

depending on the input, either a matrix or an array

Details

This function crops an image in two different ways.

Author

Lampros Mouselimis

Examples


path = system.file("tmp_images", "2.jpg", package = "OpenImageR")

image = readImage(path)

# IF 'equal_spaced':
crop1 = cropImage(image, new_width = 20, new_height = 20, type = 'equal_spaced')

# IF 'user_defined':
crop2 = cropImage(image, new_width = 5:20, new_height = 5:20, type = 'user_defined')