QuietZoneSize 

Overview

When the toolkit checks for a barcode on a scan line in an image, it ignores those parts of the line that are not preceded by the number of white pixels specified by QuietZoneSize.  

Default value = 10% of image resolution (i.e. 10 pixels in a 100dpi image) 

void STSetParameter(hBarcode, ST_QUIET_SIZE, uint16 *value) ;

void STGetParameter(hBarcode, ST_QUIET_SIZE, uint16 *value) ;

e.g

// Set a quiet zone size of 10 pixels.
#include "barcode.h"
uint16 value = 10 ;
STSetParameter(hBarcode, ST_QUIET_SIZE, &value) ;