These robots can clean, exercise - and care for you in old age. Would you trust them to?
You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.
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Source: Computational Materials Science, Volume 267
What is chickenpox and who can get an NHS vaccine?