GetTextLineTop Method (GdPictureOCR)
Returns the top y-coordinate of the bounding box of the specified line, that is a part of a specified OCR result.
This method uses a coordinate system, where the origin is in the top-left corner of the processed image and the units are pixels.
public int GetTextLineTop(
string ,
int
)
public function GetTextLineTop(
: String;
: Integer
): Integer;
public function GetTextLineTop(
: String,
: int
) : int;
public: int GetTextLineTop(
string* ,
int
)
public:
int GetTextLineTop(
String^ ,
int
)
'Declaration
Public Function GetTextLineTop( _
ByVal As String, _
ByVal As Integer _
) As Integer
Parameters
- OCRResultID
- The unique result identifier of the executed OCR process obtained by the GdPictureOCR.RunOCR method.
- TextLineIdx
- The 0-based index of the text line within the specified OCR result. It must be a value between 0 and GdPictureOCR.GetTextLineCount(OCRResultID) - 1.
Return Value
The top y-coordinate of the text line's bounding box, in pixels.
Please always use the GdPictureOCR.GetStat method to determine if this method has been successful.
How to find out the number of recognized text lines within the OCR result and some of the text line's properties.
Dim caption As String = "Example: GetTextLineTop"
Dim gdpictureOCR As GdPictureOCR = New GdPictureOCR
Dim gdpicturePDF As GdPicturePDF = New GdPicturePDF
'Load the PDF document.
If gdpicturePDF.LoadFromFile("input.pdf", False) = GdPictureStatus.OK Then
'Set the new origin for better coordinates handling.
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginTopLeft)
gdpicturePDF.SetLineColor(Color.Olive)
gdpicturePDF.SetLineWidth(2)
'Select the first page.
gdpicturePDF.SelectPage(1)
'Render this page to a 200 DPI image.
Dim image As Integer = gdpicturePDF.RenderPageToGdPictureImage(200, True)
If gdpicturePDF.GetStat = GdPictureStatus.OK AndAlso
gdpictureOCR.SetImage(image) = GdPictureStatus.OK Then
'Setting up the image is mandatory.
Dim message As String = Nothing
'Set up the OCR parameters.
gdpictureOCR.ResourcesFolder = "C:\Path\To\GdPicture.NET 14\Redist\OCR"
gdpictureOCR.AddLanguage(OCRLanguage.English)
'Set up the OCR context and the character list.
gdpictureOCR.Context = OCRContext.OCRContextSingleBlock
gdpictureOCR.CharacterSet = ""
'Run the OCR process.
Dim resID As String = gdpictureOCR.RunOCR()
If gdpictureOCR.GetStat = GdPictureStatus.OK Then
Dim linesCount As Integer = gdpictureOCR.GetTextLineCount(resID)
If gdpictureOCR.GetStat() = GdPictureStatus.OK Then
message = message + "The number of recognized text lines: " + linesCount.ToString() + vbCrLf
For i As Integer = 0 To linesCount - 1
message = message + "The line nr." + i.ToString() + " contains " + gdpictureOCR.GetTextLineWordCount(resID, i).ToString() + " words." + vbCrLf
message = message + " The first word index is " + gdpictureOCR.GetTextLineFirstWordIndex(resID, i).ToString() + "." + vbCrLf
Dim left As Integer = gdpictureOCR.GetTextLineLeft(resID, i)
Dim top As Integer = gdpictureOCR.GetTextLineTop(resID, i)
If gdpicturePDF.DrawRectangle(left, top, gdpictureOCR.GetTextLineRight(resID, i) - left, gdpictureOCR.GetTextLineBottom(resID, i) - top, False, True) = GdPictureStatus.OK Then
message = message + " Drawn: yes" + vbCrLf
Else
message = message + " Drawn: no" + vbCrLf
End If
Next
MessageBox.Show(message, caption)
'Continue with analyzing the result ...
'Save the page with drawn recognized text lines to the new PDF document.
If gdpicturePDF.SaveToFile("output.pdf") = GdPictureStatus.OK Then
MessageBox.Show("Done!", caption)
Else
MessageBox.Show("The file can't be saved. Status: " + gdpicturePDF.GetStat().ToString(), caption)
End If
Else
MessageBox.Show("The GetTextLineCount() method has failed with the status: " + gdpictureOCR.GetStat().ToString())
End If
Else
MessageBox.Show("The error occurred when running the OCR. Status: " + gdpictureOCR.GetStat().ToString(), caption)
End If
'Release the image.
GdPictureDocumentUtilities.DisposeImage(image)
Else
MessageBox.Show("The error occurred when creating or setting up the image. Status: " + gdpicturePDF.GetStat().ToString() + "/" + gdpictureOCR.GetStat().ToString(), caption)
End If
'Close the document.
gdpicturePDF.CloseDocument()
Else
MessageBox.Show("The file can't be loaded. Status: " + gdpicturePDF.GetStat().ToString(), caption)
End If
'Release resources.
gdpictureOCR.ReleaseOCRResults()
gdpictureOCR.Dispose()
gdpicturePDF.Dispose()
string caption = "Example: GetTextLineTop";
GdPictureOCR gdpictureOCR = new GdPictureOCR();
GdPicturePDF gdpicturePDF = new GdPicturePDF();
//Load the PDF document.
if (gdpicturePDF.LoadFromFile("input.pdf", false) == GdPictureStatus.OK)
{
//Set the new origin for better coordinates handling.
gdpicturePDF.SetOrigin(PdfOrigin.PdfOriginTopLeft);
gdpicturePDF.SetLineColor(Color.Olive);
gdpicturePDF.SetLineWidth(2);
//Select the first page.
gdpicturePDF.SelectPage(1);
//Render this page to a 200 DPI image.
int image = gdpicturePDF.RenderPageToGdPictureImage(200, true);
if ((gdpicturePDF.GetStat() == GdPictureStatus.OK) &&
(gdpictureOCR.SetImage(image) == GdPictureStatus.OK)) //Setting up the image is mandatory.
{
string message = "";
//Set up the OCR parameters.
gdpictureOCR.ResourcesFolder = "C:\\Path\\To\\GdPicture.NET 14\\Redist\\OCR";
gdpictureOCR.AddLanguage(OCRLanguage.English);
//Set up the OCR context and the character list.
gdpictureOCR.Context = OCRContext.OCRContextSingleBlock;
gdpictureOCR.CharacterSet = "";
//Run the OCR process.
string resID = gdpictureOCR.RunOCR();
if (gdpictureOCR.GetStat() == GdPictureStatus.OK)
{
int linesCount = gdpictureOCR.GetTextLineCount(resID);
if (gdpictureOCR.GetStat() == GdPictureStatus.OK)
{
message = message + "The number of recognized text lines: " + linesCount.ToString() + "\n";
for (int i = 0; i < linesCount; i++)
{
message = message + "The line nr." + i.ToString() + " contains " + gdpictureOCR.GetTextLineWordCount(resID, i).ToString() + " words.\n";
message = message + " The first word index is " + gdpictureOCR.GetTextLineFirstWordIndex(resID, i).ToString() + ".\n";
int left = gdpictureOCR.GetTextLineLeft(resID, i);
int top = gdpictureOCR.GetTextLineTop(resID, i);
if (gdpicturePDF.DrawRectangle(left, top, gdpictureOCR.GetTextLineRight(resID, i) - left, gdpictureOCR.GetTextLineBottom(resID, i) - top, false, true) == GdPictureStatus.OK)
message = message + " Drawn: yes\n";
else
message = message + " Drawn: no\n";
}
MessageBox.Show(message, caption);
//Continue with analyzing the result ...
//Save the page with drawn recognized text lines to the new PDF document.
if (gdpicturePDF.SaveToFile("output.pdf") == GdPictureStatus.OK)
MessageBox.Show("Done!", caption);
else
MessageBox.Show("The file can't be saved. Status: " + gdpicturePDF.GetStat().ToString(), caption);
}
else
MessageBox.Show("The GetTextLineCount() method has failed with the status: " + gdpictureOCR.GetStat().ToString());
}
else
MessageBox.Show("The error occurred when running the OCR. Status: " + gdpictureOCR.GetStat().ToString(), caption);
//Release the image.
GdPictureDocumentUtilities.DisposeImage(image);
}
else
MessageBox.Show("The error occurred when creating or setting up the image. Status: " + gdpicturePDF.GetStat().ToString() + "/" + gdpictureOCR.GetStat().ToString(), caption);
//Close the document.
gdpicturePDF.CloseDocument();
}
else
MessageBox.Show("The file can't be loaded. Status: " + gdpicturePDF.GetStat().ToString(), caption);
//Release resources.
gdpictureOCR.ReleaseOCRResults();
gdpictureOCR.Dispose();
gdpicturePDF.Dispose();