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As UFOs generally look like saucers, you could try to train a Haar cascade with sample images like this.

Make sure not to test close to a trap shooting range, as this might lead to many false positives

As It might be hard to collect a significant amount of positive samples for that purpose, but as we all know, UFOs generally look like saucers, so you could try to train a Haar cascade with sample images like this.

Make sure not to test close to a trap shooting range, as this might lead to many false positives