ImgBackTrackThresholdiAverage

Prototype

ImgBackTrackThresholdAverage (intImageHandle, intLocalWidth, intLocalHeight, intMinThreshold, intMaxThreshold, intContribute)

Description

Converts a grayscale image by applying background tracking thresholding.  Each pixel of image is binarized using a local threshold value computed automatically by analyzing surrounding pixels in the specified window size so that a automatic global threshold value is corrected using a local value obtained averaging grayscale values of local window.  The process can be customized selecting several parameters.

Parameters

intImageHandle: integer value corresponding to the image handle.

intLocalWidth: value specifying window width.

intLocalHeight: value specifying window height.

intMinThreshold: value specifying minimal threshold to use, between 0 and 255. Use -1 to allow auto-calculation of the best value for the image.

intMaxThreshold: value specifying maximum threshold to use, between 0 and 255. Use -1 to allow auto-calculation of the best value for the image.

intContribute: the contribute percentage, between 0 and 100% of local threshold over global threshold.

Returned value

None.

Example

// Applies background tracking thresholding

ImgBackTrackThresholdAverage(_CurrentImage,5,5,140,200,70);