59 lines
2.0 KiB
Markdown
59 lines
2.0 KiB
Markdown
Recoding in 5 python modules
|
|
==================
|
|
|
|
- Less platform dependent implementation
|
|
- Higher versality (wrt addition of new intput / output file tytes)
|
|
|
|
Normalize 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
|
|
|
|
Preprocess normalized inputs (perform jobs in parallel)
|
|
----------------------------
|
|
|
|
- Orientation (if requested by user)
|
|
- Correct orientation
|
|
- Skew angle (if requested by user)
|
|
- Correct skew angle
|
|
- Cleaning (if requested by user)
|
|
- Clean image
|
|
Perform OCR (perform jobs in parallel)
|
|
- Perform OCR and save resulting hocr file for each respective page (perfom jobs in parallel)
|
|
|
|
Generate output for each 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
|
|
|
|
|
|
|
|
New temp folder structure
|
|
=========================
|
|
|
|
- tmp_xxxxx/
|
|
- a_raw_images (either from images or extracted from pdf file)
|
|
- b_preprocessed_images (after deswing anf cleaning)
|
|
- c_hocr_files
|
|
- d_output_pages (one file per page (at first 1 pdf file per page. Later on other formats might be supported)
|
|
- e_final_output (concatenate output pages and conversion into PDF/1-a standard, Later on support other formats)
|