I’m not entirely sure how this works.
In: Technology
Bob (secretly) takes 4 adds 6 and 3 and 8 to it and then tells you the average value (arithmetic mean) is nearest to 5.
Next Alice asks you what the four numbers were that Bob was adding together and you have to guess them in the right order only knowing that the mean is about 5.
This is (approximately) what happens with a single pixelated image block if you interpret numbers that Bob knows as the brightness of the real image and the average as the pixel brightness you see.
In a video consisting of multiple sequential pixelated images with movement, there maybe slightly more information that Bob tells you but it is still not enough to get back to 4, 6, 3, 8.
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