Pixel sets (pixsets)
Pixel sets represent sets of pixels in images (ROIs, foreground, etc.). From an implementation point of view, they're just a thin layer over arrays of logical values, just like the cimg class is a layer over arrays of numeric values. Pixsets can be turned back into logical arrays, but they come with a number of generic functions that should make your life easier. They are created automatically whenever you run a test on an image (for example im > 0 returns a pixset).
pixset(x)
x |
an array of logical values |
#A test on an image returns a pixset boats > 250 #Pixsets can be combined using the usual Boolean operators (boats > 230) & (Xc(boats) < width(boats)/2) #Subset an image using a pixset boats[boats > 250] #Turn a pixset into an image as.cimg(boats > 250) #Equivalently: (boats > 250) + 0
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