OCR-File

gem 'ocr-file'

  require 'ocr-file'

  config = {
    # Images from PDF
    filetype: 'png',
    quality: 100,
    dpi: 300,
    # Text to PDF
    font: 'Helvetica',
    font_size: 5, #8 # 12
    text_x: 20,
    text_y: 800,
    minimum_word: 5,
    # Cloud-Vision OCR
    image_annotator: nil, # Needed for Cloud-Vision
    type_of_ocr: OcrFile::OcrEngines::CloudVision::DOCUMENT_TEXT_DETECTION,
    ocr_engine: 'tesseract', # 'cloud-vision'
    # Image Pre-Processing
    image_preprocess: true,
    effects: ['despeckle', 'deskew', 'enhance', 'sharpen', 'remove_shadow', 'bw'], # Applies effects as listed. 'norm' is also available
    automatic_reprocess: true, # Will possibly do double + the operations but can produce better results automatically
    dimensions: [width, height], # Can be nil but will lock the images
    # PDF to Image Processing
    optimise_pdf: true,
    extract_pdf_images: true, # if false will screenshot each PDF page
    temp_filename_prefix: 'image',
    spelling_correction: true, # Will attempt to fix text at the end (not used for searchable pdf output)
    keep_files: false,
    # Console Output
    verbose: true,
    timing: true
  }

  doc = OcrFile::Document.new(
    original_file_path: '/path-to-original-file/', # supports PDFs and images
    save_file_path: '/folder-to-save-to/',
    config: config # Not needed as defaults are used when not provided
  )

  doc.to_s # Returns text, removes temp files and wont save
  doc.to_pdf # Saves a PDF (either searchable over the images or dumped text)
  doc.to_text # Saves a text file with OCR text

  # How to generate PDFs of images or text files:
  original_file_path = 'file.txt' OR 'file.png'

  doc = OcrFile::Document.new(
    original_file_path: original_file_path, # supports PDFs and images
    save_file_path: '/folder-to-save-to/',
    config: config # Not needed as defaults are used when not provided
  )

  doc.to_pdf

  # How to merge files into a single PDF:
  # The files can be images or other PDFs
  require 'ocr-file'
  require 'hexapdf'

  filepaths = []

  merged_document = ::HexaPDF::Document.new

  documents = filepaths.map { |path| 
    if path.include?(".pdf") || path.include?(".PDF")
      OcrFile::ImageEngines::PdfEngine.open_pdf(path) 
    else # Assume image
      # insert_image(document, image_path, dimensions: nil)
      OcrFile::ImageEngines::PdfEngine.insert_image(::HexaPDF::Document.new, path, dimensions: nil)
    end
  }

  merged_document = OcrFile::ImageEngines::PdfEngine.merge(documents)
  OcrFile::ImageEngines::PdfEngine.save_pdf(merged_document, save_file_path, optimise: true)