patch_summary_cimg: Extract a numerical summary from image patches, using CImg's...

In imager: Image Processing Library Based on 'CImg'

Extract a numerical summary from image patches, using CImg's mini-language Experimental feature.

Description

Extract a numerical summary from image patches, using CImg's mini-language Experimental feature.

Usage

patch_summary_cimg(im, expr, cx, cy, wx, wy)

Arguments

im	an image
expr	a CImg expression (as a string)
cx	vector of x coordinates for patch centers
cy	vector of y coordinates for patch centers
wx	vector of coordinates for patch width
wy	vector of coordinates for patch height

Examples

#Example: median filtering using patch_summary_cimg
#Center a patch at each pixel
im <- grayscale(boats)
patches <- pixel.grid(im)  %>% dplyr::mutate(w=3,h=3)
#Extract patch summary
out <- dplyr::mutate(patches,med=patch_summary_cimg(im,"ic",x,y,w,h))
as.cimg(out,v.name="med") %>% plot

imager documentation built on May 29, 2024, 1:38 a.m.