Rotate an image using the 'nearest' or 'bilinear' method

Rotate an image by angle using the 'nearest' or 'bilinear' method

Usage

rotateImage(image, angle, method = "nearest", mode = "same", threads = 1)

Arguments

image: matrix, data frame or 3-dimensional array where the third dimension is equal to 3
angle: specifies the number of degrees
method: a string specifying the interpolation method when rotating an image ( 'nearest', 'bilinear' )
mode: one of 'full', 'same' (same indicates that the ouput image will have the same dimensions with initial image)
threads: the number of cores to run in parallel

Value

depending on the input, either a matrix or an array

Details

This function rotates an image by a user-specified angle. A positive angle turns the image counter-clockwise (as displayed with the first row at the top, for instance by imageShow()), the opposite direction of rotateFixed(): rotateImage(image, 90) gives the same result as rotateFixed(image, 270) for a square image.

Examples


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

image = readImage(path)

r = rotateImage(image, 75, threads = 1)