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BUILT-IN MATHEMATICA SYMBOL

RidgeFilter

RidgeFilter[image]
computes a measure for the presence of a ridge for each pixel in image.

uses the specified ridge scale

The main principal curvature orthogonal to a ridge is given by the main negative eigenvalue of the Hessian matrix.

In RidgeFilter, is the scale of the ridges that is used to compute the derivatives in the Hessian.

RidgeFilter works with arbitrary grayscale or multichannel images, operating separately on each channel.

RidgeFilter supports the following options to compute the Hessian matrix and the main principal curvature:

	InterpolationOrder	Automatic	interpolation order
	Padding	"Fixed"	padding method

The Padding option accepts the settings , , , , or a numeric value. A list of two settings can specify different paddings for each dimension.

Detect lines of a given width in a noisy image with uneven brightness:

Find the mountain ridges in a terrain elevation raster:

Enhance the strokes of handwritten characters:

Detect lines of a given width in a noisy image with uneven brightness:

Out[1]=

Find the mountain ridges in a terrain elevation raster:

Out[1]=

Enhance the strokes of handwritten characters:

Out[1]=

Extract lines of a given thickness:

Find the red ridges in a microscopic photo of a Yucca leaf:

Extract the thin walls: