Finding a pin in a haystack – PCA image filtering

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I found the following post regarding the anomalous metal object observed in a Curiosity Rover photo to be fascinating – specifically, the clever ways that some programmers used for filtering the image for the object. The following answer on mathematica.stackexchange.com was especially illuminating for its use of a multivariate distribution to describe the color channels for a test region of “sand”. This distribution was subsequently used to assess if the rest of the image colors belonged to the same distribution.
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