SharpenImg

DESCRIPTION

Computes a edge-enhanced image by convolving with a sharpening kernel. The sharpening kernel is based upon the circular kernel used in BlurImg, but with different weights. The weight for all "count" of the kernel elements inside the circle is -Sharpen, except for the center, which gets a weight of

1 + Sharpen * (count - 1)

so that the weights sum to unity. Sharpen must lie in the range [0..1]. This edge detection method is described in:

Digital Image Processing, Gonzales, R.C., Wintz, P., Addison Wesley, Second Edition, 1987, pp 176--186.

INPUTS

Port: Img In
Type: Lattice
Constraints: 1..3-D
source image

WIDGETS

Port: Sharpness
Type: Dial

Port: Radius
Type: Dial
sharpen radius

OUTPUTS

Port: Img Out
Type: Lattice
Constraints: 1..3-D
sharpened image

KNOWN PROBLEMS

SEE ALSO

SobelEdgeImg, LaplaceEdgeImg, BlurImg.
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© The Numerical Algorithms Group Ltd, Oxford UK. 2000