Generate a discrete bar code from the elements widths.

discrete_1d_bar_code converts the list of element widths (output from find_1d_bar_code or get_1d_bar_code) into a discrete bar code. Thus every element is then represented by its number of modules (1,2,..) and no longer as its width in pixels.

This operator is used if the bar code type is not available so that decode_1d_bar_code cannot be applied, thus the user wants to find the bar code with the help of HALCON operators and then himself decode the bar code. To create the bar code description the operator gen_1d_bar_code_descr_gen is used and with find_1d_bar_code the element widths are extracted. Then discrete_1d_bar_code is used to create the list of the multiple of the modules.

HTuple   empty;   // empty list of values
HTuple   BarCodeDescr;
HTuple   BarcodeFound,Elements,Orientation;
HTuple   DiscreteBarCode;
Hobject  Image,CodeRegion;

gen_1d_bar_code_descr_gen(20,40,2,empty,empty,-1.0,"false",&BarCodeDescr);
find_1d_bar_code(Image,&CodeRegion,BarCodeDescr,empty,empty,
                 &BarcodeFound,&Elements,&Orientation);
if (BarcodeFound[0].l)
{
  discrete_1d_bar_code(Elements,BarCodeDescr,&DiscreteBarCode);
  for (int i=0; i<DiscreteBarCode.Num(); i++)
  {
    int NumModules = DiscreteBarCode[i];
  }
}

The operator discrete_1d_bar_code returns the value 2 (H_MSG_TRUE) if the transfered bar code description is correct and the the element list can be discretized.

discrete_1d_bar_code is reentrant and processed without parallelization.

find_1d_bar_code, get_1d_bar_code

decode_1d_bar_code

Barcode reader