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Complete tool reimplementation in python
Segregate the processing into 4 main tasks
Segregate the processing into 5 main tasks
- Normalization of inputs.
- Inputs can be:
- a PDF file
- one or several images of any type
- What preprocessing does:
- In case of PDF file:
- If the page needs to be OCRed:
- Extract the image corresponding to the page and save it in a tmp folder. 3 approaches to extract the image:
- extract raw image from pdf
- if not possible: identify resolution and rasterize page
- if not possible: use default resolution and rasterize
- If not:
- Save the page AS-IS in the tmp folder that should contained the final page
- In case of separate images:
- Just copy the images with standardized name into the tmp folder containing pages to be OCRed
- Normalization of inputs (inputs can be a pdf file, an image, a folder containing images)
- For pdf:
- Identify if image already contains fonts
- If the page needs to be OCRed:
- Extract the image corresponding to the page and save it in a tmp folder. 3 approaches to extract images:
- extract raw image from pdf and rotate it according to pdf page rotation
- if not possible: identify resolution and rasterize
- if not possible: use default resolution and rasterize
- If not:
- Save the page AS-IS in the tmp folder that should contained the final page
- For image(s):
- Just copy the images with standardized name into the tmp folder containing pages to be OCRed
- Preprocessing of normalized inputs (perform jobs in parallel)
- Identify orientation and skew angle
- deskew / rotate image
- Clean image
- Orientation (if requested by user)
- Correct orientation
- Skew angle (if requested by user)
- Correct skew angle
- Cleaning (if requested by user)
- Clean image
- OCRing (perform jobs in parallel)
- Just perform OCR in save resulting hocr file for each respective page (to be
- Build output (currently only PDF file generation will be supported)
- Perform OCR and save resulting hocr file for each respective page (perfom jobs in parallel)
- Build output per page
- For pdf (if output file has a "pdf" extension):
- Generate pdf pages from hocr files (note: pdf pages can already exist if OCR has been skipped for them)
- Build final output:
- For pdf:
- Concatenate pdf pages
- Converte to pdf/1-a
- Verify conformity to pdf/1-a