ThresholdDynamic Method (Image, Int32, Int32, DynamicThresholdNorm)

public static Image Dynamic(
	Image img,
	int windowSize,
	int threshold,
	DynamicThresholdNorm norm
)

Public Shared Function Dynamic ( 
	img As Image,
	windowSize As Integer,
	threshold As Integer,
	norm As DynamicThresholdNorm
) As Image

public:
static Image^ Dynamic(
	Image^ img, 
	int windowSize, 
	int threshold, 
	DynamicThresholdNorm norm
)

static member Dynamic : 
        img : Image * 
        windowSize : int * 
        threshold : int * 
        norm : DynamicThresholdNorm -> Image 

Parameters

img

Type: Stemmer.CvbImage
Image to be thresholded.

windowSize

Type: SystemInt32

Window size to calculate the dynamic threshold.

Bigger window sizes will lead to higher processing times.

threshold

Type: SystemInt32
Threshold offset to use

norm

Type: Stemmer.Cvb.FoundationDynamicThresholdNorm
Either Mean or MinMax.

Return Value

Dynamic thresholding works by calculating the average gray value over a mask with given size(centered around the pixel in question) for each input pixel. If the difference between this average and the pixel, that is currently being looked at, is above the specified threshold, then the corresponding pixel in the output image is set to white, otherwise it is black.

This function is particularly useful, when dealing with images, that have a non-uniform illumination.

Reference