To color the pixels, the Hue-Saturation-Value (HSV) format was used with the normalized average descriptor as hue, a fixed value of 1.0 as the saturation and 𝑣𝑎𝑙𝑢𝑒 = min(0.25, log 0 ( 𝑐𝑜𝑢𝑛𝑡 𝑛𝑜𝑟𝑚 )). With this setup, the pixels that have low count are gradually merged with the background and those that have the highest counts stand out.