Getting the Bounding Rectangle for a string within an OCR OcrLine object

beckstev — Mon, 08 Feb 2010 20:31:12 GMT

Hi,

I am using the OCR module to recognize a document and then search for a viariety of patterns at the OcrLine object level. I can't use the word level becuse some of the patterns span multiple words.

I want to be able to search the OcrLine text and then create a bounding rectangle for each instance of the pattern I find so that I can create an annotation that covers each instance of the pattern. How can I do this?

Here is the basic code I'm using to cycle through the OcrLines and search for the text

                        // Cycle thru all lines in a text region
                        foreach (OcrLine oLine in otrRegion.Lines)
                        {

                            // Search for string at the line level
                            // We will either search for social security number patterns or
                            // search for the string provided in the hidden string to search for
                            // override parameter if present
                            if (sOverrideStringToRecognize != String.Empty)
                            {
                                if (oLine.Text.ToUpper() == sOverrideStringToRecognize.ToUpper())
                                {
                                    sWork = System.Windows.Forms.TextRenderer.MeasureText(oLine.Text,oLine.GetFontAt(op.Resolution, iFM, iFB, 0));
                                    lrOcrLineBounds.Add(oLine.Bounds);
                                    iRecogWLineCount++;
                                }
                            }
                            else
                            {
                                // We are searching specifically for social security type numbers

                                // Set up the Regular expression to either search for the full social or all of it but the last 4 digits
                                if (this.ocrWorkItem.BTConfigHashTable["BTPartiallyRedactSocial"].ToString() == "1")
                                {
                                    re = new Regex("\\d{3}\\D\\s*.*\\s*\\d{2}\\s*.\\s*\\d{4}", RegexOptions.IgnoreCase);
                                }
                                else
                                {
                                    re = new Regex("\\d{3}\\D\\s*.*\\s*\\d{2}\\s*.\\s*\\d{4}", RegexOptions.IgnoreCase);
                                }

MatchCollection reMC = re.Matches(oLine.Text);

                                if (reMC.Count > 0)
                                {
                                    foreach (Match m in reMC)
                                 {
                                        fntWork = oLine.GetFontAt(op.Resolution,iFM, iFB, m.Index);

                                        sWork = System.Windows.Forms.TextRenderer.MeasureText(m.Value, fntWork);
                                        lrOcrLineBounds.Add(new Rectangle(oLine.Bounds.X,oLine.Bounds.Y,sWork.Width,sWork.Height));
                                        iRecogWLineCount++;
                                 }

}
}

ASP.NET Imaging Discussion

Getting the Bounding Rectangle for a string within an OCR OcrLine object