EnhanceLocal Method

Description:

Enhances an image using the local standard deviation and mean.

This method transforms the input image f(x, y) to a new image g(x, y) based on the following formula,

g(x, y) = A(x, y) * [f(x, y) - m(x, y)] + m(x, y)

where,

A(x, y) = k * M / sigma(x, y), with k being a scaling factor within the range [0, 1], m(x, y) and sigma(x, y) being the local mean and local standard deviation, and M being the global of the input image.

To avoid the problem of spikes caused by too small local standard deviation, a check against the minimum allowed standard deviation is performed. If the local standard deviation is too small, the minimum allowed instead will be used in the calculation.

This method takes into account the ROI settings of pPage object, that are accessible via the IGPage.ROI property. By default ROI is set to the entire image.

Syntax:

      EnhanceLocal(pPage As IGPage, winWidth As Long, winHeight As
Long, scaleFactor As Double, minStdDev As Double);

Parameters:

Name	Description
pPage	IGPage object to enhance.
winWidth	Width of the local window.
winHeight	Height of the local window.
scaleFactor	Scaling factor.
minStdDev	Minimum allowed standard deviation.

Return Value:

N/A

Bits Per Pixel:

8 bit grayscale images with one channel

Sample:

Image Processing and Effects