Hi Everyone I'm very new here. I wonder how I can raise the image quality in pdf?? what can I do for this, here is an example file) I try to keep the quality at 300 dpi and throw it into the PIX class. here is my sample code. outputs 0.52% when reading. I would like to raise it to 80-85%
*var documentText = new StringBuilder(); using (var pdf = new
PdfDocument("chet6.pdf")) { using (var engine =
new TesseractEngine(@"tessdata", "rus+eng", EngineMode.LstmOnly))
{ for (int i = 0; i < pdf.PageCount; ++i)
{ if (documentText.Length > 0)
documentText.Append("\r\n\r\n");
PdfPage page = pdf.Pages[i]; string searchableText =
page.GetText(); // Simple check if the page contains
searchable text. // We do not need to perform OCR in
that case. //foreach (PdfImage image in
page.GetImages()) //{ //
// simple hack to replace the right-bottom image only
// if (image.Height == 512) //
image.ReplaceWith("1px.png"); //}
if (!string.IsNullOrEmpty(searchableText.Trim()))
{ documentText.Append(searchableText);
continue; }
// Save PDF page as high-resolution image
PdfDrawOptions options = PdfDrawOptions.Create();
options.BackgroundColor = new PdfRgbColor(255, 255, 255);
options.HorizontalResolution = 300;
options.VerticalResolution = 300; string pageImage =
$"page_{i}.png"; page.Save(pageImage, options);
//page.Rotation = PdfRotation.None;
//page.Save(pageImage, options); // Perform OCR
using (Pix img = Pix.LoadFromFile(pageImage))
{ //using (Page recognizedPage =
engine.Process(img, PageSegMode.SingleBlock))
using (Page recognizedPage = engine.Process(img))
{ Console.WriteLine($"Mean confidence for
page #{i}: {recognizedPage.GetMeanConfidence()}");
string recognizedText = recognizedPage.GetText();
documentText.Append(recognizedText);
} } File.Delete(pageImage);
} } } using (var
writer = new StreamWriter("result.txt"))
writer.Write(documentText.ToString()); }*
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chet6.pdf
Description: Adobe PDF document
