//Before segmenting we want to get rid of rubbish in the back of the string
public PreFilterResult PreFilter(SegmentInput Input)
{
PreFilterResult result = new PreFilterResult();
string str = Input.OcrString;
if (str != null)
{
int length = Input.OcrString.Length;
if (length > 0)
{
byte[] ascii = Encoding.ASCII.GetBytes(str);
char[] str_char = str.ToCharArray(); //string is read-only, have to modify the character array and convert back to string
var char_list = new List <char>(str_char); //Convert to List to be able to easily remove at position
//removing characters which not numbers or letters, start from right to left
//only remove at the end of the string
int i = length - 1;
while (i > 7) //Min. Dot length = 7
{
int a = (int)ascii[i];
if (!((a > 47 && a < 58) || (a > 64 && a < 91))) //Only capital letters and numbers 0-9 allowed
{
char_list.RemoveAt(i);
}
else
{
break; //only remove rubbisch char at end of string (, we keep order of indexes in List)
}
i--;
}
str_char = char_list.ToArray();
str = new string(str_char);
}
}
else
{
str = "";
}
result.OcrFiltered = str;
return(result);
}
public SegmentResult Segment(SegmentInput input, double devW)
{
//Segment into list of Segment indexes and spaces
SegmentResult result = new SegmentResult();
PreFilterResult filtered = PreFilter(input);//Filter rubbish end of string
input.OcrString = filtered.OcrFiltered;
ViDiReadResultList lists = GenerateList(input); //Use filtered string to generate lists
double w = 0;
double xCurr = 0;
double xPrev = 0;
int nChar = lists.Read.Length;
double dev = devW; //consider space when difference between two positions is > dev * characterwidth
List <double> x_list = new List <double>(); //list for width of characters
x_list = lists.XPosList;
List <double> w_list = new List <double>(); //list for width of characters
w_list = lists.WidthList;
List <double> segm_x_list = new List <double>(); //list for x-positions of start of new segment
List <int> segm_i_list = new List <int>(); //list for character indexes of start of new segment
List <double> space_list = new List <double>(); //list for size of spaces of segment
if (nChar > 0 && x_list.Count == w_list.Count && x_list.Count == nChar) //Lists have same number of elements(should be the case)
{
w = w_list.Max(); //retain widest character as reference for calculating space
//First segment starts at first character - index 0 for X-position
xCurr = x_list[0];
segm_x_list.Add(x_list[0]);
segm_i_list.Add(0);
//Loop through the remaining characters --> list of index positions with start of segments
xPrev = xCurr;
int i = 1; //start at 1, we handled 0 above
while (i < nChar)
{
xCurr = x_list[i];
if ((xCurr - xPrev) > (dev * w)) //consider space when difference between two positions is > dev * characterwidth -->New segment
{
segm_x_list.Add(xCurr);
segm_i_list.Add(i);
space_list.Add(xCurr - xPrev);
}
xPrev = xCurr;
i++;
}
}
else
{
//
}
result.Nsegments = segm_i_list.Count; //Get number of segments
result.SegmentIndexList = segm_i_list;
result.SpaceList = space_list;
result.FilteredString = lists.Read;
return(result);
}
