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In applied mathematics, a steerable filter[1]
is an orientation-selective convolution kernel used for image enhancement and feature extraction that can be expressed via a linear combination of a small set of rotated versions of itself. As an example, the oriented first derivative of a 2D Gaussian is a steerable filter. The oriented first order derivative can be obtained by taking the dot product of a unit vector oriented in a specific direction with the gradient. The basis filters are the partial derivatives of a 2D Gaussian with respect to and .
The process by which the oriented filter is synthesized at any given angle is known as steering, which is used in similar sense as in beam steering for antenna arrays. Applications of steerable filters include edge detection, oriented texture analysis and shape from shading.
Steerable filters may be designed as approximations of a given filter shape up to a desired error or computational complexity.[2]
^Cite error: The named reference Freeman-Adelson-1991 was invoked but never defined (see the help page).
^Cite error: The named reference Perona-1995 was invoked but never defined (see the help page).
In applied mathematics, a steerablefilter is an orientation-selective convolution kernel used for image enhancement and feature extraction that can be...
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December 2008. F. Hart, S. Luniya, J. Nath, A. Victor and M. B. Steer, “Modeling high-order filters in a transient microwave circuit simulator,” IET Microwaves...
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context of air-to-air combat, against a mechanically scanned radar that would filter out the low closing speed of the perpendicular flight as ground clutter...
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period, digital filters became standard in high-end TVs while the older analog filter began appearing in cheaper models (although notch filters were still...
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