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英國國家社會研究中心的資深研究員約翰·柯蒂斯爵士（Prof Sir John Curtice）表示，他們每年持續得到相同趨勢，讓他對其結果比對YouGov的兩個單點數字更有信心。
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.