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Adding page range to load_pdf #190

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Adding page range to load_pdf #190

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13 changes: 10 additions & 3 deletions src/layoutparser/io/pdf.py
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,8 @@ def load_pdf(
vertical_ttb: bool = True,
extra_attrs: Optional[List[str]] = None,
dpi: int = DEFAULT_PDF_DPI,
first_page: Optional[int] = None,
last_page: Optional[int] = None
) -> Union[List[Layout], Tuple[List[Layout], List["Image.Image"]]]:
"""Load all tokens for each page from a PDF file, and save them
in a list of Layout objects with the original page order.
Expand Down Expand Up @@ -159,7 +161,10 @@ def load_pdf(
pdf_layouts, it can be rendered appropriately.
Defaults to `DEFAULT_PDF_DPI=72`, which is also the default rendering dpi
from the pdfplumber PDF parser.

first_page (int, optional):
First page to process.
last_page (int, optional):
Last page to process before stopping.
Returns:
List[Layout]:
When `load_images=False`, it will only load the pdf_tokens from
Expand All @@ -182,6 +187,8 @@ def load_pdf(

all_page_layout = []
for page_id in range(len(plumber_pdf_object.pages)):
if (first_page and page_id < first_page - 1) or (last_page and page_id >= last_page):
continue
cur_page = plumber_pdf_object.pages[page_id]

page_tokens = extract_words_for_page(
Expand All @@ -207,7 +214,7 @@ def load_pdf(
else:
import pdf2image

pdf_images = pdf2image.convert_from_path(filename, dpi=dpi)
pdf_images = pdf2image.convert_from_path(filename, dpi=dpi, first_page=first_page, last_page=last_page)

for page_id, page_image in enumerate(pdf_images):
image_width, image_height = page_image.size
Expand All @@ -222,4 +229,4 @@ def load_pdf(
page_layout.page_data["height"] = image_height
all_page_layout[page_id] = page_layout

return all_page_layout, pdf_images
return all_page_layout, pdf_images