compress {bwimage} | R Documentation |
Compress data from square image to circular in binary matrix
compress(imagematrix, method = "radial", background = NA)
imagematrix |
The matrix to be compressed. |
method |
Compress algorithm. Four algorithms (radial, shirley, squircle, and elliptical) are available to stretch the image. The algorithms were adapted from Lambers 2016. |
background |
Code for background cell value. When compressing a squared matrix, corners of the transformed matrix will no have corresponding pixel from original matrix. Thus, the background value will be the value of transformed matrix corners. |
A matrix of 0, 1 and NA representing white, black and transparent pixels, respectively.
Carlos Biagolini-Jr.
Lambers 2016 Mappings between Sphere, Disc, and Square. Journal of Computer Graphics Techniques, 5(2): 1-21.
img_location <- system.file("extdata/chesstable.png",package ="bwimage") image_matrix<- threshold_color(img_location,"png", "frame_fixed",target_width = 50,target_height=50) compress(image_matrix,method="radial")