get("#380") -- hashImage

w, h = img.width, img.height

function cacheImage()

  cached = {}

  for i = 1, 100 do

    local x, y = math.random(0, w-1), math.random(0, h-1)

    cached[i] = {x, y, img.getInt(x, y)} 

  end

end

function hasMovement()

  for i = 1, #cached do

    local x, y, pix = unpack(cached[i])

    if img.getInt(x, y) ~= pix then

      return true

    end

  end

  return false

end

return function()

  if cached == nil then

    cacheImage()

    return nil -- "Initializing..."

  end

  if hasMovement() then

    cacheImage()

    return "Movement"

  else

    cacheImage() -- optional, but a little safer

    return "Probably no movement"

  end

end