Hipass

Filters an image using a highpass kernel of size 3x3 or 5x5.

Inputs

Image (Type: Image)

The input image.

KernelSize (Type: Int32)

The kernel size (3 -> 3x3, 5 -> 5x5).

Region (Type: Region)

Specifies an optional area of interest.

Outputs

Image (Type: Image)

The output image.

Comments

The function applies a hipass filter. The corresponding kernel is either a 3x3 matrix with the following values:

::

-1 -1 -1 -1 8 -1 -1 -1 -1

or a 5x5 matrix with the following values:

-1 -1 -1 -1 -1
-1 -1 -1 -1 -1
-1 -1 24 -1 -1
-1 -1 -1 -1 -1
-1 -1 -1 -1 -1

The effect of a hipass filter is that it amplifies high frequencies and attenuates low frequencies. The strength of the hiwpass filter depends on the size of the kernel.

Here are a few results of the hipass filter with increasing kernel sizes:

Original:

KernelSize = 3:

KernelSize = 5:

Sample

Here is an example that shows how to use the hipass filter.