public IActionResult Ocr(IFormFile file)
{
try
{
if (file == null || file.Length == 0)
{
return(Content("Error: No file uploaded"));
}
if (file.ContentType.IndexOf("image", StringComparison.OrdinalIgnoreCase) < 0)
{
return(Content("Error: File is not an image"));
}
string appRootPath = _appEnvironment.WebRootPath;
string storedFileName = $"{DateTime.Now.ToString("yyyyMMdd_HHmmsss")} _{file.FileName}";
string imagePath = $@"{appRootPath}{ds}UserFiles{ds}{storedFileName}";
using (FileStream stream = new FileStream(imagePath, FileMode.Create))
{
file.CopyTo(stream);
}
// convert if tiff
if (Path.GetExtension(imagePath) == ".tif" || Path.GetExtension(imagePath) == ".tiff")
{
Bitmap bm = new Bitmap(imagePath);
storedFileName = $"{Path.GetFileNameWithoutExtension(imagePath)}.png";
imagePath = $@"{appRootPath}{ds}UserFiles{ds}{storedFileName}";
bm.Save(imagePath, ImageFormat.Png);
}
// get tesseract to OCR
TessRunner tess = new TessRunner(imagePath);
ViewData["ImageFileName"] = storedFileName;
ViewData["RawTsv"] = tess.RawTsv;
// JSON for presentation in page
ViewData["JsonText"] = JsonConvert.SerializeObject(tess.Page, Formatting.Indented);
// JSON for deserialization
ViewData["Json"] = JsonConvert.SerializeObject(tess.Page);
List <Word> allWords = tess.Page.Blocks.SelectMany(b => b.Paragraphs.SelectMany(p => p.Lines.SelectMany(l => l.Words))).ToList();
ViewData["WordCount"] = allWords.Count;
ViewData["AverageConfidence"] = allWords.Average(w => w.Confidence);
ViewData["PageText"] = tess.PageText;
// get image properties
Bitmap bitmap = new Bitmap(imagePath);
ViewData["ImageDimensions"] = $"Width: {bitmap.Width}, Height: {bitmap.Height}";
ViewData["ImageResolution"] = $"{Math.Ceiling(bitmap.HorizontalResolution)}dpi";
return(View("OcrResult"));
}
catch (Exception ex)
{
Log(ex.Message);
return(View("Error"));
}
}
public IActionResult Ocr(int id)
{
try
{
string imageFileName = "";
switch (id)
{
case 1:
imageFileName = "Ada_newspaper.jpg";
break;
case 2:
imageFileName = "Font_test.jpg";
break;
case 3:
imageFileName = "Financial_statement.png";
break;
default:
System.Console.WriteLine("GET: Home/Ocr/{id} - no ID provided");
Log("GET: Home/Ocr/{id} - no ID provided");
break;
}
string appRootPath = _appEnvironment.WebRootPath;
string imagePath = $@"{appRootPath}{ds}images{ds}OcrSamples{ds}{imageFileName}";
if (!System.IO.File.Exists(imagePath))
{
return(Content("File does not exist"));
}
TessRunner tess = new TessRunner(imagePath);
ViewData["ImageFileName"] = System.IO.Path.GetFileName(imagePath);
ViewData["RawTsv"] = tess.RawTsv;
ViewData["JsonText"] = JsonConvert.SerializeObject(tess.Page, Formatting.Indented);
ViewData["Json"] = JsonConvert.SerializeObject(tess.Page);
List <Word> allWords = tess.Page.Blocks.SelectMany(b => b.Paragraphs.SelectMany(p => p.Lines.SelectMany(l => l.Words))).ToList();
ViewData["WordCount"] = allWords.Count;
ViewData["AverageConfidence"] = allWords.Average(w => w.Confidence);
ViewData["PageText"] = tess.PageText;
// get image properties
Bitmap bitmap = new Bitmap(imagePath);
ViewData["ImageDimensions"] = $"Width: {bitmap.Width}, Height: {bitmap.Height}";
ViewData["ImageResolution"] = $"{Math.Ceiling(bitmap.HorizontalResolution)}dpi";
ViewData["SampleImageFile"] = imageFileName;
return(View("OcrResult"));
}
catch (Exception ex)
{
Log(ex.Message);
return(View("Error"));
}
}
