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In mathematical morphology and digital image processing, a top-hat transform is an operation that extracts small elements and details from given images.There exist two types of top-hat transform: the white top-hat transform is defined as the difference between the input image and its opening by some structuring element, while the black top-hat transform is defined dually as the difference ...
The Tyrolean hat (German: Tirolerhut, Italian: cappello alpino), also Tyrolese hat, Bavarian hat or Alpine hat, is a type of headwear that originally came from the Tyrol in the Alps, in what is now part of Austria, Germany, Italy and Switzerland.
A Hardee hat with infantry adornment; the brim on this hat at Gettysburg National Military Park is pinned on the right, inconsistent with regulations. The Hardee hat, also known as the Model 1858 Dress Hat and sometimes nicknamed the "Jeff Davis", was the regulation dress hat for enlisted men in the Union Army during the American Civil War.
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