Looking at a picture of a flock of birds on the wing, I wondered how the image could be analysed to count them - black shapes on a blue background. I'm sure that this is used in industry and in science - but what is the algorithm?

The black shapes are of course irregular - but let's simplify it to say that one black shape = 1 reindeer. I mean bird. More sherry, Santa?

The black shapes are of course irregular - but let's simplify it to say that one black shape = 1 reindeer. I mean bird. More sherry, Santa?

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