490 lines
20 KiB
Python
490 lines
20 KiB
Python
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import json
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from io import BytesIO
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from loguru import logger
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from pypdf import PdfReader, PdfWriter, PageObject
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from reportlab.pdfgen import canvas
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from .enum_class import BlockType, ContentType, SplitFlag
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def cal_canvas_rect(page, bbox):
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"""
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Calculate the rectangle coordinates on the canvas based on the original PDF page and bounding box.
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Args:
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page: A PyPDF2 Page object representing a single page in the PDF.
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bbox: [x0, y0, x1, y1] representing the bounding box coordinates.
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Returns:
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rect: [x0, y0, width, height] representing the rectangle coordinates on the canvas.
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"""
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page_width, page_height = float(page.cropbox[2]), float(page.cropbox[3])
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actual_width = page_width # The width of the final PDF display
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actual_height = page_height # The height of the final PDF display
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rotation_obj = page.get("/Rotate", 0)
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try:
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rotation = int(rotation_obj) % 360 # cast rotation to int to handle IndirectObject
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except (ValueError, TypeError) as e:
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logger.warning(f"Invalid /Rotate value {rotation_obj!r} on page; defaulting to 0. Error: {e}")
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rotation = 0
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if rotation in [90, 270]:
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# PDF is rotated 90 degrees or 270 degrees, and the width and height need to be swapped
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actual_width, actual_height = actual_height, actual_width
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x0, y0, x1, y1 = bbox
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rect_w = abs(x1 - x0)
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rect_h = abs(y1 - y0)
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if rotation == 270:
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rect_w, rect_h = rect_h, rect_w
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x0 = actual_height - y1
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y0 = actual_width - x1
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elif rotation == 180:
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x0 = page_width - x1
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# y0 stays the same
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elif rotation == 90:
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rect_w, rect_h = rect_h, rect_w
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x0, y0 = y0, x0
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else:
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# rotation == 0
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y0 = page_height - y1
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rect = [x0, y0, rect_w, rect_h]
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return rect
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def draw_bbox_without_number(i, bbox_list, page, c, rgb_config, fill_config):
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new_rgb = [float(color) / 255 for color in rgb_config]
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page_data = bbox_list[i]
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for bbox in page_data:
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rect = cal_canvas_rect(page, bbox) # Define the rectangle
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if fill_config: # filled rectangle
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c.setFillColorRGB(new_rgb[0], new_rgb[1], new_rgb[2], 0.3)
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c.rect(rect[0], rect[1], rect[2], rect[3], stroke=0, fill=1)
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else: # bounding box
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c.setStrokeColorRGB(new_rgb[0], new_rgb[1], new_rgb[2])
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c.rect(rect[0], rect[1], rect[2], rect[3], stroke=1, fill=0)
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return c
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def draw_bbox_with_number(i, bbox_list, page, c, rgb_config, fill_config, draw_bbox=True):
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new_rgb = [float(color) / 255 for color in rgb_config]
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page_data = bbox_list[i]
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# 强制转换为 float
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page_width, page_height = float(page.cropbox[2]), float(page.cropbox[3])
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for j, bbox in enumerate(page_data):
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# 确保bbox的每个元素都是float
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rect = cal_canvas_rect(page, bbox) # Define the rectangle
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if draw_bbox:
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if fill_config:
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c.setFillColorRGB(*new_rgb, 0.3)
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c.rect(rect[0], rect[1], rect[2], rect[3], stroke=0, fill=1)
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else:
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c.setStrokeColorRGB(*new_rgb)
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c.rect(rect[0], rect[1], rect[2], rect[3], stroke=1, fill=0)
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c.setFillColorRGB(*new_rgb, 1.0)
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c.setFontSize(size=10)
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c.saveState()
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rotation_obj = page.get("/Rotate", 0)
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try:
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rotation = int(rotation_obj) % 360 # cast rotation to int to handle IndirectObject
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except (ValueError, TypeError):
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logger.warning(f"Invalid /Rotate value: {rotation_obj!r}, defaulting to 0")
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rotation = 0
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if rotation == 0:
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c.translate(rect[0] + rect[2] + 2, rect[1] + rect[3] - 10)
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elif rotation == 90:
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c.translate(rect[0] + 10, rect[1] + rect[3] + 2)
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elif rotation == 180:
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c.translate(rect[0] - 2, rect[1] + 10)
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elif rotation == 270:
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c.translate(rect[0] + rect[2] - 10, rect[1] - 2)
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c.rotate(rotation)
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c.drawString(0, 0, str(j + 1))
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c.restoreState()
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return c
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def draw_layout_bbox(pdf_info, pdf_bytes, out_path, filename):
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dropped_bbox_list = []
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tables_body_list, tables_caption_list, tables_footnote_list = [], [], []
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imgs_body_list, imgs_caption_list, imgs_footnote_list = [], [], []
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codes_body_list, codes_caption_list = [], []
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titles_list = []
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texts_list = []
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interequations_list = []
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lists_list = []
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list_items_list = []
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indexs_list = []
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for page in pdf_info:
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page_dropped_list = []
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tables_body, tables_caption, tables_footnote = [], [], []
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imgs_body, imgs_caption, imgs_footnote = [], [], []
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codes_body, codes_caption = [], []
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titles = []
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texts = []
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interequations = []
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lists = []
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list_items = []
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indices = []
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for dropped_bbox in page['discarded_blocks']:
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page_dropped_list.append(dropped_bbox['bbox'])
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dropped_bbox_list.append(page_dropped_list)
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for block in page["para_blocks"]:
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bbox = block["bbox"]
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if block["type"] == BlockType.TABLE:
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for nested_block in block["blocks"]:
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bbox = nested_block["bbox"]
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if nested_block["type"] == BlockType.TABLE_BODY:
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tables_body.append(bbox)
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elif nested_block["type"] == BlockType.TABLE_CAPTION:
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tables_caption.append(bbox)
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elif nested_block["type"] == BlockType.TABLE_FOOTNOTE:
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if nested_block.get(SplitFlag.CROSS_PAGE, False):
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continue
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tables_footnote.append(bbox)
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elif block["type"] == BlockType.IMAGE:
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for nested_block in block["blocks"]:
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bbox = nested_block["bbox"]
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if nested_block["type"] == BlockType.IMAGE_BODY:
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imgs_body.append(bbox)
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elif nested_block["type"] == BlockType.IMAGE_CAPTION:
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imgs_caption.append(bbox)
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elif nested_block["type"] == BlockType.IMAGE_FOOTNOTE:
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imgs_footnote.append(bbox)
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elif block["type"] == BlockType.CODE:
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for nested_block in block["blocks"]:
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if nested_block["type"] == BlockType.CODE_BODY:
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bbox = nested_block["bbox"]
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codes_body.append(bbox)
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elif nested_block["type"] == BlockType.CODE_CAPTION:
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bbox = nested_block["bbox"]
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codes_caption.append(bbox)
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elif block["type"] == BlockType.TITLE:
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titles.append(bbox)
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elif block["type"] in [BlockType.TEXT, BlockType.REF_TEXT]:
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texts.append(bbox)
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elif block["type"] == BlockType.INTERLINE_EQUATION:
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interequations.append(bbox)
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elif block["type"] == BlockType.LIST:
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lists.append(bbox)
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if "blocks" in block:
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for sub_block in block["blocks"]:
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list_items.append(sub_block["bbox"])
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elif block["type"] == BlockType.INDEX:
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indices.append(bbox)
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tables_body_list.append(tables_body)
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tables_caption_list.append(tables_caption)
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tables_footnote_list.append(tables_footnote)
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imgs_body_list.append(imgs_body)
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imgs_caption_list.append(imgs_caption)
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imgs_footnote_list.append(imgs_footnote)
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titles_list.append(titles)
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texts_list.append(texts)
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interequations_list.append(interequations)
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lists_list.append(lists)
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list_items_list.append(list_items)
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indexs_list.append(indices)
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codes_body_list.append(codes_body)
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codes_caption_list.append(codes_caption)
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layout_bbox_list = []
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table_type_order = {"table_caption": 1, "table_body": 2, "table_footnote": 3}
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for page in pdf_info:
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page_block_list = []
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for block in page["para_blocks"]:
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if block["type"] in [
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BlockType.TEXT,
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BlockType.REF_TEXT,
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BlockType.TITLE,
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BlockType.INTERLINE_EQUATION,
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BlockType.LIST,
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BlockType.INDEX,
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]:
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bbox = block["bbox"]
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page_block_list.append(bbox)
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elif block["type"] in [BlockType.IMAGE]:
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for sub_block in block["blocks"]:
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bbox = sub_block["bbox"]
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page_block_list.append(bbox)
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elif block["type"] in [BlockType.TABLE]:
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sorted_blocks = sorted(block["blocks"], key=lambda x: table_type_order[x["type"]])
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for sub_block in sorted_blocks:
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if sub_block.get(SplitFlag.CROSS_PAGE, False):
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continue
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bbox = sub_block["bbox"]
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page_block_list.append(bbox)
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elif block["type"] in [BlockType.CODE]:
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for sub_block in block["blocks"]:
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bbox = sub_block["bbox"]
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page_block_list.append(bbox)
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layout_bbox_list.append(page_block_list)
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pdf_bytes_io = BytesIO(pdf_bytes)
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pdf_docs = PdfReader(pdf_bytes_io)
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output_pdf = PdfWriter()
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for i, page in enumerate(pdf_docs.pages):
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# 获取原始页面尺寸
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page_width, page_height = float(page.cropbox[2]), float(page.cropbox[3])
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custom_page_size = (page_width, page_height)
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packet = BytesIO()
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# 使用原始PDF的尺寸创建canvas
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c = canvas.Canvas(packet, pagesize=custom_page_size)
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c = draw_bbox_without_number(i, codes_body_list, page, c, [102, 0, 204], True)
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c = draw_bbox_without_number(i, codes_caption_list, page, c, [204, 153, 255], True)
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c = draw_bbox_without_number(i, dropped_bbox_list, page, c, [158, 158, 158], True)
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c = draw_bbox_without_number(i, tables_body_list, page, c, [204, 204, 0], True)
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c = draw_bbox_without_number(i, tables_caption_list, page, c, [255, 255, 102], True)
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c = draw_bbox_without_number(i, tables_footnote_list, page, c, [229, 255, 204], True)
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c = draw_bbox_without_number(i, imgs_body_list, page, c, [153, 255, 51], True)
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c = draw_bbox_without_number(i, imgs_caption_list, page, c, [102, 178, 255], True)
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c = draw_bbox_without_number(i, imgs_footnote_list, page, c, [255, 178, 102], True)
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c = draw_bbox_without_number(i, titles_list, page, c, [102, 102, 255], True)
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c = draw_bbox_without_number(i, texts_list, page, c, [153, 0, 76], True)
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c = draw_bbox_without_number(i, interequations_list, page, c, [0, 255, 0], True)
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c = draw_bbox_without_number(i, lists_list, page, c, [40, 169, 92], True)
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c = draw_bbox_without_number(i, list_items_list, page, c, [40, 169, 92], False)
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c = draw_bbox_without_number(i, indexs_list, page, c, [40, 169, 92], True)
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c = draw_bbox_with_number(i, layout_bbox_list, page, c, [255, 0, 0], False, draw_bbox=False)
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c.save()
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packet.seek(0)
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overlay_pdf = PdfReader(packet)
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# 添加检查确保overlay_pdf.pages不为空
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if len(overlay_pdf.pages) > 0:
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new_page = PageObject(pdf=None)
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new_page.update(page)
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page = new_page
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page.merge_page(overlay_pdf.pages[0])
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else:
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# 记录日志并继续处理下一个页面
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# logger.warning(f"layout.pdf: 第{i + 1}页未能生成有效的overlay PDF")
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pass
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output_pdf.add_page(page)
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# 保存结果
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with open(f"{out_path}/{filename}", "wb") as f:
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output_pdf.write(f)
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def draw_span_bbox(pdf_info, pdf_bytes, out_path, filename):
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text_list = []
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inline_equation_list = []
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interline_equation_list = []
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image_list = []
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table_list = []
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dropped_list = []
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def get_span_info(span):
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if span['type'] == ContentType.TEXT:
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page_text_list.append(span['bbox'])
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elif span['type'] == ContentType.INLINE_EQUATION:
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page_inline_equation_list.append(span['bbox'])
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elif span['type'] == ContentType.INTERLINE_EQUATION:
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page_interline_equation_list.append(span['bbox'])
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elif span['type'] == ContentType.IMAGE:
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page_image_list.append(span['bbox'])
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elif span['type'] == ContentType.TABLE:
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page_table_list.append(span['bbox'])
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for page in pdf_info:
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page_text_list = []
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page_inline_equation_list = []
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page_interline_equation_list = []
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page_image_list = []
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page_table_list = []
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page_dropped_list = []
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# 构造dropped_list
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for block in page['discarded_blocks']:
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if block['type'] == BlockType.DISCARDED:
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for line in block['lines']:
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for span in line['spans']:
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page_dropped_list.append(span['bbox'])
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dropped_list.append(page_dropped_list)
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# 构造其余useful_list
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# for block in page['para_blocks']: # span直接用分段合并前的结果就可以
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for block in page['preproc_blocks']:
|
||
|
|
if block['type'] in [
|
||
|
|
BlockType.TEXT,
|
||
|
|
BlockType.TITLE,
|
||
|
|
BlockType.INTERLINE_EQUATION,
|
||
|
|
BlockType.LIST,
|
||
|
|
BlockType.INDEX,
|
||
|
|
]:
|
||
|
|
for line in block['lines']:
|
||
|
|
for span in line['spans']:
|
||
|
|
get_span_info(span)
|
||
|
|
elif block['type'] in [BlockType.IMAGE, BlockType.TABLE]:
|
||
|
|
for sub_block in block['blocks']:
|
||
|
|
for line in sub_block['lines']:
|
||
|
|
for span in line['spans']:
|
||
|
|
get_span_info(span)
|
||
|
|
text_list.append(page_text_list)
|
||
|
|
inline_equation_list.append(page_inline_equation_list)
|
||
|
|
interline_equation_list.append(page_interline_equation_list)
|
||
|
|
image_list.append(page_image_list)
|
||
|
|
table_list.append(page_table_list)
|
||
|
|
|
||
|
|
pdf_bytes_io = BytesIO(pdf_bytes)
|
||
|
|
pdf_docs = PdfReader(pdf_bytes_io)
|
||
|
|
output_pdf = PdfWriter()
|
||
|
|
|
||
|
|
for i, page in enumerate(pdf_docs.pages):
|
||
|
|
# 获取原始页面尺寸
|
||
|
|
page_width, page_height = float(page.cropbox[2]), float(page.cropbox[3])
|
||
|
|
custom_page_size = (page_width, page_height)
|
||
|
|
|
||
|
|
packet = BytesIO()
|
||
|
|
# 使用原始PDF的尺寸创建canvas
|
||
|
|
c = canvas.Canvas(packet, pagesize=custom_page_size)
|
||
|
|
|
||
|
|
# 获取当前页面的数据
|
||
|
|
draw_bbox_without_number(i, text_list, page, c,[255, 0, 0], False)
|
||
|
|
draw_bbox_without_number(i, inline_equation_list, page, c, [0, 255, 0], False)
|
||
|
|
draw_bbox_without_number(i, interline_equation_list, page, c, [0, 0, 255], False)
|
||
|
|
draw_bbox_without_number(i, image_list, page, c, [255, 204, 0], False)
|
||
|
|
draw_bbox_without_number(i, table_list, page, c, [204, 0, 255], False)
|
||
|
|
draw_bbox_without_number(i, dropped_list, page, c, [158, 158, 158], False)
|
||
|
|
|
||
|
|
c.save()
|
||
|
|
packet.seek(0)
|
||
|
|
overlay_pdf = PdfReader(packet)
|
||
|
|
|
||
|
|
# 添加检查确保overlay_pdf.pages不为空
|
||
|
|
if len(overlay_pdf.pages) > 0:
|
||
|
|
new_page = PageObject(pdf=None)
|
||
|
|
new_page.update(page)
|
||
|
|
page = new_page
|
||
|
|
page.merge_page(overlay_pdf.pages[0])
|
||
|
|
else:
|
||
|
|
# 记录日志并继续处理下一个页面
|
||
|
|
# logger.warning(f"span.pdf: 第{i + 1}页未能生成有效的overlay PDF")
|
||
|
|
pass
|
||
|
|
|
||
|
|
output_pdf.add_page(page)
|
||
|
|
|
||
|
|
# Save the PDF
|
||
|
|
with open(f"{out_path}/{filename}", "wb") as f:
|
||
|
|
output_pdf.write(f)
|
||
|
|
|
||
|
|
|
||
|
|
def draw_line_sort_bbox(pdf_info, pdf_bytes, out_path, filename):
|
||
|
|
layout_bbox_list = []
|
||
|
|
|
||
|
|
for page in pdf_info:
|
||
|
|
page_line_list = []
|
||
|
|
for block in page['preproc_blocks']:
|
||
|
|
if block['type'] in [BlockType.TEXT]:
|
||
|
|
for line in block['lines']:
|
||
|
|
bbox = line['bbox']
|
||
|
|
index = line['index']
|
||
|
|
page_line_list.append({'index': index, 'bbox': bbox})
|
||
|
|
elif block['type'] in [BlockType.TITLE, BlockType.INTERLINE_EQUATION]:
|
||
|
|
if 'virtual_lines' in block:
|
||
|
|
if len(block['virtual_lines']) > 0 and block['virtual_lines'][0].get('index', None) is not None:
|
||
|
|
for line in block['virtual_lines']:
|
||
|
|
bbox = line['bbox']
|
||
|
|
index = line['index']
|
||
|
|
page_line_list.append({'index': index, 'bbox': bbox})
|
||
|
|
else:
|
||
|
|
for line in block['lines']:
|
||
|
|
bbox = line['bbox']
|
||
|
|
index = line['index']
|
||
|
|
page_line_list.append({'index': index, 'bbox': bbox})
|
||
|
|
elif block['type'] in [BlockType.IMAGE, BlockType.TABLE]:
|
||
|
|
for sub_block in block['blocks']:
|
||
|
|
if sub_block['type'] in [BlockType.IMAGE_BODY, BlockType.TABLE_BODY]:
|
||
|
|
if len(sub_block['virtual_lines']) > 0 and sub_block['virtual_lines'][0].get('index', None) is not None:
|
||
|
|
for line in sub_block['virtual_lines']:
|
||
|
|
bbox = line['bbox']
|
||
|
|
index = line['index']
|
||
|
|
page_line_list.append({'index': index, 'bbox': bbox})
|
||
|
|
else:
|
||
|
|
for line in sub_block['lines']:
|
||
|
|
bbox = line['bbox']
|
||
|
|
index = line['index']
|
||
|
|
page_line_list.append({'index': index, 'bbox': bbox})
|
||
|
|
elif sub_block['type'] in [BlockType.IMAGE_CAPTION, BlockType.TABLE_CAPTION, BlockType.IMAGE_FOOTNOTE, BlockType.TABLE_FOOTNOTE]:
|
||
|
|
for line in sub_block['lines']:
|
||
|
|
bbox = line['bbox']
|
||
|
|
index = line['index']
|
||
|
|
page_line_list.append({'index': index, 'bbox': bbox})
|
||
|
|
sorted_bboxes = sorted(page_line_list, key=lambda x: x['index'])
|
||
|
|
layout_bbox_list.append(sorted_bbox['bbox'] for sorted_bbox in sorted_bboxes)
|
||
|
|
pdf_bytes_io = BytesIO(pdf_bytes)
|
||
|
|
pdf_docs = PdfReader(pdf_bytes_io)
|
||
|
|
output_pdf = PdfWriter()
|
||
|
|
|
||
|
|
for i, page in enumerate(pdf_docs.pages):
|
||
|
|
# 获取原始页面尺寸
|
||
|
|
page_width, page_height = float(page.cropbox[2]), float(page.cropbox[3])
|
||
|
|
custom_page_size = (page_width, page_height)
|
||
|
|
|
||
|
|
packet = BytesIO()
|
||
|
|
# 使用原始PDF的尺寸创建canvas
|
||
|
|
c = canvas.Canvas(packet, pagesize=custom_page_size)
|
||
|
|
|
||
|
|
# 获取当前页面的数据
|
||
|
|
draw_bbox_with_number(i, layout_bbox_list, page, c, [255, 0, 0], False)
|
||
|
|
|
||
|
|
c.save()
|
||
|
|
packet.seek(0)
|
||
|
|
overlay_pdf = PdfReader(packet)
|
||
|
|
|
||
|
|
# 添加检查确保overlay_pdf.pages不为空
|
||
|
|
if len(overlay_pdf.pages) > 0:
|
||
|
|
new_page = PageObject(pdf=None)
|
||
|
|
new_page.update(page)
|
||
|
|
page = new_page
|
||
|
|
page.merge_page(overlay_pdf.pages[0])
|
||
|
|
else:
|
||
|
|
# 记录日志并继续处理下一个页面
|
||
|
|
# logger.warning(f"span.pdf: 第{i + 1}页未能生成有效的overlay PDF")
|
||
|
|
pass
|
||
|
|
|
||
|
|
output_pdf.add_page(page)
|
||
|
|
|
||
|
|
# Save the PDF
|
||
|
|
with open(f"{out_path}/{filename}", "wb") as f:
|
||
|
|
output_pdf.write(f)
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
# 读取PDF文件
|
||
|
|
pdf_path = "examples/demo1.pdf"
|
||
|
|
with open(pdf_path, "rb") as f:
|
||
|
|
pdf_bytes = f.read()
|
||
|
|
|
||
|
|
# 从json文件读取pdf_info
|
||
|
|
|
||
|
|
json_path = "examples/demo1_1746005777.0863056_middle.json"
|
||
|
|
with open(json_path, "r", encoding="utf-8") as f:
|
||
|
|
pdf_ann = json.load(f)
|
||
|
|
pdf_info = pdf_ann["pdf_info"]
|
||
|
|
# 调用可视化函数,输出到examples目录
|
||
|
|
draw_layout_bbox(pdf_info, pdf_bytes, "examples", "output_with_layout.pdf")
|