DynamicBinary method (Main Control)

Builder Syntax	int DynamicBinary(unsigned uDim, unsigned uLocalContrast);
Delphi Syntax	Function DynamicBinary (uDim: L_UINT; uLocalContrast: L_UINT): L_INT;
Overview	Refer to Removing Noise

Remarks

(Raster Pro and above toolkits) Converts a bitmap into a black and white image without changing its bits per pixel by using a local threshold value for each pixel of the image.

Each pixel is compared to a dynamically-calculated threshold. If the intensity of the pixel is higher (that is, the pixel is brighter) than the dynamic threshold, the pixel will be set to white. If the intensity of the pixel is lower (that is, the pixel is darker) than the dynamic threshold, the pixel will be set to black.

Increasing uLocalContrast increases the number of pixels that use the global threshold. This tends to preserve the general aspect of the image and reduces the improvement in the areas with many details. Reducing uLocalContrast, increases the contrast in areas with many details.

Increasing uDim increases the area used for local contrast. This makes the color changes smoother.

This method is good as a prerequisite for converting scanned images to 1-bit, because it uses one threshold for background and another for text.

This method supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

This method does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this method.

Elements:	IntensityDetect method, Median method, BinaryFilter method, MaxFilter method, MinFilter method, WindowLevel method, Despeckle method, Deskew method.
Topics:	Raster Images: Filtering Images