/// <summary>Performs basic image preprocessing using buffered image (if provided).</summary> /// <remarks> /// Performs basic image preprocessing using buffered image (if provided). /// Preprocessed image will be saved in temporary directory. /// </remarks> /// <param name="inputFile"> /// input image /// <see cref="System.IO.FileInfo"/> /// </param> /// <param name="pageNumber">number of page to be preprocessed</param> /// <returns> /// created preprocessed image as /// <see cref="Tesseract.Pix"/> /// </returns> internal static Pix PreprocessImage(FileInfo inputFile, int pageNumber) { Pix pix = null; // read image if (IsTiffImage(inputFile)) { pix = TesseractOcrUtil.ReadPixPageFromTiff(inputFile, pageNumber - 1); } else { pix = ReadPix(inputFile); } if (pix == null) { throw new Tesseract4OcrException(Tesseract4OcrException.CANNOT_READ_PROVIDED_IMAGE).SetMessageParams(inputFile .FullName); } return(TesseractOcrUtil.PreprocessPix(pix)); }