Rotate an image by 90, 180, 270 degrees

Rotate an image by 90, 180, 270 degrees

Usage

rotateFixed(image, angle)

Arguments

image

matrix, data frame or 3-dimensional array where the third dimension is equal to 3

angle

one of 90, 180 and 270 degrees

Value

depending on the input, either a matrix or an array

Details

This function is faster than the rotateImage function as it rotates an image for specific angles (90, 180 or 270 degrees). It turns the image clockwise (as displayed with the first row at the top, for instance by imageShow()), the opposite direction of rotateImage(): rotateFixed(image, 90) gives the same result as rotateImage(image, 270, mode = 'same') for a square image.

Examples

path = system.file("tmp_images", "3.jpeg", package = "OpenImageR")

image = readImage(path)

r = rotateFixed(image, 90)