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Mathematica > Data Manipulation > Image Processing & Analysis > Mathematical Morphology >

Built-in Mathematica Symbol

BottomHatTransform

BottomHatTransform[image, ker]
gives the morphological bottom-hat transform of image with respect to structuring element ker.

BottomHatTransform[image, r]
gives the bottom-hat transform with respect to a range r square.

BottomHatTransform automatically pads structuring elements to have odd dimensions.

If multiple image channels are present, BottomHatTransform operates on each of them separately.

BottomHatTransform preserves regions smaller than the structuring element whose channel values are smaller than their surroundings.

Bottom-hat transform applied to a color photo:

Extract small dark regions from a color image:

Use a disk-shaped structuring element to extract washers that are smaller than the specified size:

The bottom-hat transform effectively inverts high-frequency regions:

Bottom-hat transform applied to a color photo:

Extract small dark regions from a color image:

Use a disk-shaped structuring element to extract washers that are smaller than the specified size:

The bottom-hat transform effectively inverts high-frequency regions:

Extract thin dark features:

Add the result to the original image to remove those thin features: