/// <summary>Preprocess given image if it is needed.</summary>
/// <param name="inputImage">
/// original input image
/// <see cref="System.IO.FileInfo"/>
/// </param>
/// <param name="pageNumber">number of page to be OCRed</param>
/// <returns>
/// path to output image as
/// <see cref="System.String"/>
/// </returns>
private String PreprocessImage(FileInfo inputImage, int pageNumber)
{
String tmpFileName = TesseractOcrUtil.GetTempFilePath(Guid.NewGuid().ToString(), GetExtension(inputImage));
String path = inputImage.FullName;
try {
if (GetTesseract4OcrEngineProperties().IsPreprocessingImages())
{
Pix pix = ImagePreprocessingUtil.PreprocessImage(inputImage, pageNumber);
TesseractOcrUtil.SavePixToTempPngFile(tmpFileName, pix);
if (!File.Exists(System.IO.Path.Combine(tmpFileName)))
{
System.Drawing.Bitmap img = TesseractOcrUtil.ConvertPixToImage(pix);
if (img != null)
{
TesseractOcrUtil.SaveImageToTempPngFile(tmpFileName, img);
}
}
}
if (!GetTesseract4OcrEngineProperties().IsPreprocessingImages() || !File.Exists(System.IO.Path.Combine(tmpFileName
)))
{
TesseractOcrUtil.CreateTempFileCopy(path, tmpFileName);
}
if (File.Exists(System.IO.Path.Combine(tmpFileName)))
{
path = tmpFileName;
}
}
catch (System.IO.IOException e) {
LogManager.GetLogger(GetType()).Error(MessageFormatUtil.Format(Tesseract4LogMessageConstant.CANNOT_READ_INPUT_IMAGE
, e.Message));
}
return(path);
}
public virtual void TestNullSavingAsPng()
{
String tmpFileName = TesseractOcrUtil.GetTempFilePath(GetTargetDirectory() + "/testNullSavingAsPng", ".png"
);
TesseractOcrUtil.SaveImageToTempPngFile(tmpFileName, null);
NUnit.Framework.Assert.IsFalse(File.Exists(System.IO.Path.Combine(tmpFileName)));
TesseractOcrUtil.SavePixToTempPngFile(tmpFileName, null);
NUnit.Framework.Assert.IsFalse(File.Exists(System.IO.Path.Combine(tmpFileName)));
}
public virtual void TestPixSavingAsPng()
{
String path = TEST_IMAGES_DIRECTORY + "numbers_01.jpg";
String tmpFileName = GetTargetDirectory() + "testPixSavingAsPng.png";
NUnit.Framework.Assert.IsFalse(File.Exists(System.IO.Path.Combine(tmpFileName)));
Pix pix = ImagePreprocessingUtil.ReadPix(new FileInfo(path));
TesseractOcrUtil.SavePixToTempPngFile(tmpFileName, pix);
NUnit.Framework.Assert.IsTrue(File.Exists(System.IO.Path.Combine(tmpFileName)));
TesseractHelper.DeleteFile(tmpFileName);
NUnit.Framework.Assert.IsFalse(File.Exists(System.IO.Path.Combine(tmpFileName)));
}