Extract a numerical summary from image patches, using CImg's mini-language Experimental feature.
Extract a numerical summary from image patches, using CImg's mini-language Experimental feature.
patch_summary_cimg(im, expr, cx, cy, wx, wy)
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 |
#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
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