Feat/219 keep extracted image elements

[christinestraub]

Closes issue #219.

Summary

• update merge_inferred_layout_with_extracted_layout to keep extracted image elements

The following documents can be used for testing and evaluation.

• Captur-1317-5_ENG-p23.pdf
• Captur-1317-5_ENG_1-10.pdf

Testing

from unstructured_inference.inference.layout import DocumentLayout

f_path = "sample-docs/embedded-images.pdf"

# default image output directory
doc = DocumentLayout.from_file(
    filename=f_path,
    extract_images_in_pdf=True,
)

# specific image output directory
doc = DocumentLayout.from_file(
    filename=f_path,
    extract_images_in_pdf=True,
    image_output_dir_path=<directory_path>,
)

Evaluation

// Extracting Images
$ PYTHONPATH=. python examples/image_extraction/embedded-image-extraction.py Captur-1317-5_ENG-p23.pdf unstructured

// Layout Visualziation
$ PYTHONPATH=. python examples/layout_analysis/visualization.py Captur-1317-5_ENG-p23.pdf image_oly

[badGarnet]

1. confirmed this is working and on example pdf gets all the images
2. test instruction has typos 😬 (path should be image_extraction not image-extraction
3. not related to this PR but worth a followup ticket/issue: refactor the logic for inferred_is_text so it is more modular instead of buried in the long chain of function