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CvInvokeIlluminationChange Method
http://www.emgu.com
Applying an appropriate non-linear transformation to the gradient field inside the selection and then integrating back with a Poisson solver, modifies locally the apparent illumination of an image.

Namespace: Emgu.CV
Assembly: Emgu.CV.World (in Emgu.CV.World.dll) Version: 3.2.0.2682 (3.2.0.2682)
Syntax
public static void IlluminationChange(
	IInputArray src,
	IInputArray mask,
	IOutputArray dst,
	float alpha = 0.2f,
	float beta = 0.4f
)

Parameters

src
Type: Emgu.CVIInputArray
Input 8-bit 3-channel image.
mask
Type: Emgu.CVIInputArray
Input 8-bit 1 or 3-channel image.
dst
Type: Emgu.CVIOutputArray
Output image with the same size and type as src.
alpha (Optional)
Type: SystemSingle
Value ranges between 0-2.
beta (Optional)
Type: SystemSingle
Value ranges between 0-2.
See Also