Auto-update: Sat Oct 26 13:45:39 PDT 2024
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sanj
parent
e4dc0ab99a
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1 changed files with 202 additions and 97 deletions
299
bates
299
bates
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@ -133,95 +133,126 @@ def ocr_page(pdf_path, page_num):
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logging.error(f"[{filename}] OCR failed for page {page_num}: {str(e)}")
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return ""
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def extract_text_from_page(page, pdf_path, page_num, use_ocr):
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"""Extract text from a page, using OCR if enabled and needed."""
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def extract_text_from_page_multilayer(page, pdf_path, page_num):
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"""Extract text from different PDF layers."""
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filename = Path(pdf_path).name
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# Get page dimensions
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width = page.width
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height = page.height
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# Calculate crop box for bottom fifth of page
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padding = 2 # 2 point padding
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# Start at 80% down the page (leaving bottom fifth)
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padding = 2
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y0 = max(0, min(height * 0.8, height - padding))
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y1 = max(y0 + padding, min(height, height))
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# Use full width
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x0 = padding
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x1 = max(x0 + padding, min(width - padding, width))
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# Ensure the crop box makes sense
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if x1 <= x0 or y1 <= y0:
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logging.warning(f"[{filename}] Page {page_num}: Invalid crop box dimensions, using full page")
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x0, y0 = 0, 0
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x1, y1 = width, height
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crop_box = (x0, y0, x1, y1)
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logging.info(f"[{filename}] Page {page_num}: Page size: {width}x{height} points")
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logging.info(f"[{filename}] Page {page_num}: Crop box: ({x0:.2f}, {y0:.2f}, {x1:.2f}, {y1:.2f})")
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logging.info(f"[{filename}] Page {page_num}: Dimensions {width}x{height}, crop box: ({x0:.2f}, {y0:.2f}, {x1:.2f}, {y1:.2f})")
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texts = []
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# Method 1: Try regular text extraction
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try:
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# Extract text from the crop box
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cropped_text = page.crop((x0, y0, x1, y1)).extract_text() or ""
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logging.info(f"[{filename}] Page {page_num}: Cropped text: '{cropped_text}'")
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# If we don't find anything in the crop, try the full page
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if not cropped_text.strip():
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logging.info(f"[{filename}] Page {page_num}: No text in crop box, trying full page")
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full_text = page.extract_text() or ""
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logging.info(f"[{filename}] Page {page_num}: Full page text: '{full_text}'")
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return full_text
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return cropped_text
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text = page.crop(crop_box).extract_text()
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if text:
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logging.info(f"[{filename}] Page {page_num}: Regular extraction found: '{text}'")
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texts.append(text)
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except Exception as e:
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logging.error(f"[{filename}] Error extracting text from page {page_num}: {str(e)}")
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# If crop fails, try extracting text from the entire page
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logging.debug(f"[{filename}] Page {page_num}: Regular text extraction failed: {e}")
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# Method 2: Try extracting words individually
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try:
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words = page.crop(crop_box).extract_words()
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if words:
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text = ' '.join(word['text'] for word in words)
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logging.info(f"[{filename}] Page {page_num}: Word extraction found: '{text}'")
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texts.append(text)
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except Exception as e:
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logging.debug(f"[{filename}] Page {page_num}: Word extraction failed: {e}")
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# Method 3: Try extracting characters individually
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try:
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chars = page.crop(crop_box).chars
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if chars:
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text = ''.join(char['text'] for char in chars)
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logging.info(f"[{filename}] Page {page_num}: Character extraction found: '{text}'")
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texts.append(text)
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except Exception as e:
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logging.debug(f"[{filename}] Page {page_num}: Character extraction failed: {e}")
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# Method 4: Try extracting annotations
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try:
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annots = page.annots
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if annots and isinstance(annots, list): # Fix for the error
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for annot in annots:
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if isinstance(annot, dict) and 'contents' in annot:
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text = annot['contents']
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if text and not isinstance(text, str):
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text = str(text)
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if text and text.lower() != 'none':
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logging.info(f"[{filename}] Page {page_num}: Annotation found: '{text}'")
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texts.append(text)
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except Exception as e:
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logging.debug(f"[{filename}] Page {page_num}: Annotation extraction failed: {e}")
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# Method 5: Try extracting text in reverse order
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try:
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chars = sorted(page.crop(crop_box).chars, key=lambda x: (-x['top'], x['x0']))
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if chars:
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text = ''.join(char['text'] for char in chars)
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logging.info(f"[{filename}] Page {page_num}: Reverse order extraction found: '{text}'")
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texts.append(text)
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except Exception as e:
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logging.debug(f"[{filename}] Page {page_num}: Reverse order extraction failed: {e}")
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# Method 6: Last resort - flatten and OCR the crop box
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if not texts:
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try:
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logging.info(f"[{filename}] Attempting to extract text from full page")
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text = page.extract_text() or ""
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logging.info(f"[{filename}] Page {page_num}: Full page text: '{text}'")
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return text
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except Exception as e2:
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logging.error(f"[{filename}] Error extracting text from full page: {str(e2)}")
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return ""
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logging.info(f"[{filename}] Page {page_num}: Attempting flatten and OCR")
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# Import needed only if we get this far
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from pdf2image import convert_from_bytes
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import pytesseract
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# Convert just this page to image
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with tempfile.NamedTemporaryFile(suffix='.pdf') as tmp_pdf:
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# Save just this page to a temporary PDF
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writer = pdfplumber.PDF(page.page_obj)
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writer.save(tmp_pdf.name)
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# Convert to image
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images = convert_from_bytes(open(tmp_pdf.name, 'rb').read())
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if images:
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# Crop the image to our area of interest
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img = images[0]
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img_width, img_height = img.size
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crop_box_pixels = (
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int(x0 * img_width / width),
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int(y0 * img_height / height),
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int(x1 * img_width / width),
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int(y1 * img_height / height)
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)
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cropped = img.crop(crop_box_pixels)
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# OCR the cropped area
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text = pytesseract.image_to_string(cropped)
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if text:
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logging.info(f"[{filename}] Page {page_num}: Flatten/OCR found: '{text}'")
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texts.append(text)
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except Exception as e:
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logging.debug(f"[{filename}] Page {page_num}: Flatten/OCR failed: {e}")
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return texts
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def extract_text_from_page_old(page, pdf_path, page_num, use_ocr):
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"""Extract text from a page, using OCR if enabled and needed."""
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filename = Path(pdf_path).name
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# Get page dimensions
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width = page.width
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height = page.height
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# Calculate crop box as relative position (bottom right corner)
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# Use relative positioning and ensure we stay within bounds
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x0 = min(width * 0.67, width - 10) # Start at 2/3 of the width, but ensure we stay in bounds
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y0 = min(height * 0.83, height - 10) # Start at 5/6 of the height, but ensure we stay in bounds
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x1 = width # Full width
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y1 = height # Full height
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# Ensure our crop box is within bounds
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x0 = max(0, min(x0, width))
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y0 = max(0, min(y0, height))
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x1 = max(0, min(x1, width))
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y1 = max(0, min(y1, height))
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logging.debug(f"[{filename}] Page {page_num}: dimensions {width}x{height}, crop box: ({x0}, {y0}, {x1}, {y1})")
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try:
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text = page.crop((x0, y0, x1, y1)).extract_text() or ""
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logging.debug(f"[{filename}] Page {page_num}: extracted text: '{text}'")
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if use_ocr and len(text.split()) < 2:
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logging.info(f"[{filename}] Page {page_num}: has less than 2 words, attempting OCR")
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text = ocr_page(pdf_path, page_num)
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logging.debug(f"[{filename}] Page {page_num}: OCR text: '{text}'")
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return text
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except Exception as e:
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logging.error(f"[{filename}] Error extracting text from page {page_num}: {str(e)}")
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return ""
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def find_bates_number(texts, pattern):
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"""Try to find Bates number in multiple text layers."""
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for text in texts:
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matches = list(re.finditer(pattern, text))
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if matches:
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return matches[-1] # Return last match if found
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return None
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def extract_bates_numbers(pdf_path, pattern, use_ocr):
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"""Extract Bates numbers from first and last page of PDF using provided pattern."""
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@ -231,34 +262,47 @@ def extract_bates_numbers(pdf_path, pattern, use_ocr):
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with pdfplumber.open(pdf_path) as pdf:
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first_page = pdf.pages[0]
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last_page = pdf.pages[-1]
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logging.debug(f"[{filename}] PDF has {len(pdf.pages)} pages")
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first_text = extract_text_from_page(first_page, pdf_path, 0, use_ocr)
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last_text = extract_text_from_page(last_page, pdf_path, len(pdf.pages)-1, use_ocr)
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logging.debug(f"[{filename}] First page text: '{first_text}'")
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logging.debug(f"[{filename}] Last page text: '{last_text}'")
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first_matches = list(re.finditer(pattern, first_text))
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last_matches = list(re.finditer(pattern, last_text))
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logging.debug(f"[{filename}] First page matches: {[m.group(0) for m in first_matches]}")
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logging.debug(f"[{filename}] Last page matches: {[m.group(0) for m in last_matches]}")
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first_match = first_matches[-1] if first_matches else None
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last_match = last_matches[-1] if last_matches else None
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# Try all PDF layers first
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first_texts = extract_text_from_page_multilayer(first_page, pdf_path, 0)
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last_texts = extract_text_from_page_multilayer(last_page, pdf_path, len(pdf.pages)-1)
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first_match = find_bates_number(first_texts, pattern)
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last_match = find_bates_number(last_texts, pattern)
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# If no matches found, try flatten and OCR
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if not first_match or not last_match:
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logging.info(f"[{filename}] No matches in text layers, attempting flatten/OCR")
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# For first page
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if not first_match:
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try:
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flattened_text = flatten_and_ocr_page(first_page, pdf_path, 0)
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if flattened_text:
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first_texts.append(flattened_text)
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matches = list(re.finditer(pattern, flattened_text))
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if matches:
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first_match = matches[-1]
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except Exception as e:
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logging.error(f"[{filename}] Flatten/OCR failed for first page: {e}")
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# For last page
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if not last_match:
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try:
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flattened_text = flatten_and_ocr_page(last_page, pdf_path, len(pdf.pages)-1)
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if flattened_text:
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last_texts.append(flattened_text)
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matches = list(re.finditer(pattern, flattened_text))
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if matches:
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last_match = matches[-1]
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except Exception as e:
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logging.error(f"[{filename}] Flatten/OCR failed for last page: {e}")
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if first_match and last_match:
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# Extract just the numbers from the full match
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first_num = ''.join(filter(str.isdigit, first_match.group(0)))
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last_num = ''.join(filter(str.isdigit, last_match.group(0)))
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logging.info(f"[{filename}] Found numbers: {first_num}–{last_num}")
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if len(first_matches) > 1:
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logging.debug(f"[{filename}] Multiple matches on first page, using last match. All matches: {[m.group(0) for m in first_matches]}")
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if len(last_matches) > 1:
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logging.debug(f"[{filename}] Multiple matches on last page, using last match. All matches: {[m.group(0) for m in last_matches]}")
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return (first_num, last_num)
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else:
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logging.warning(f"[{filename}] No matching numbers found")
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@ -267,6 +311,64 @@ def extract_bates_numbers(pdf_path, pattern, use_ocr):
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logging.error(f"[{filename}] Error processing PDF: {str(e)}")
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return None
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def flatten_and_ocr_page(page, pdf_path, page_num):
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"""Flatten page and OCR the crop box area."""
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filename = Path(pdf_path).name
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logging.info(f"[{filename}] Page {page_num}: Attempting flatten and OCR")
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try:
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# Import needed only if we get this far
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from pdf2image import convert_from_path
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import pytesseract
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import PyPDF2
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# Get page dimensions
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width = page.width
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height = page.height
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# Calculate crop box for bottom fifth
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padding = 2
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y0 = max(0, min(height * 0.8, height - padding))
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y1 = max(y0 + padding, min(height, height))
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x0 = padding
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x1 = max(x0 + padding, min(width - padding, width))
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# Create a single-page PDF with just this page
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with tempfile.NamedTemporaryFile(suffix='.pdf', delete=False) as tmp_pdf:
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pdf_writer = PyPDF2.PdfWriter()
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with open(pdf_path, 'rb') as pdf_file:
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pdf_reader = PyPDF2.PdfReader(pdf_file)
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pdf_writer.add_page(pdf_reader.pages[page_num])
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pdf_writer.write(tmp_pdf)
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tmp_pdf.flush()
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# Convert to image
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images = convert_from_path(tmp_pdf.name)
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if images:
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# Crop the image to our area of interest
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img = images[0]
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img_width, img_height = img.size
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crop_box_pixels = (
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int(x0 * img_width / width),
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int(y0 * img_height / height),
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int(x1 * img_width / width),
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int(y1 * img_height / height)
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)
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cropped = img.crop(crop_box_pixels)
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# OCR the cropped area
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text = pytesseract.image_to_string(cropped)
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if text:
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logging.info(f"[{filename}] Page {page_num}: Flatten/OCR found: '{text}'")
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return text
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# Clean up the temporary file
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os.unlink(tmp_pdf.name)
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except Exception as e:
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logging.error(f"[{filename}] Page {page_num}: Flatten/OCR failed: {e}")
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return None
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def process_folder(folder_path, pattern, use_ocr, dry_run=False, name_prefix=None):
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"""Process all PDFs in the specified folder."""
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folder = Path(folder_path)
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@ -280,7 +382,10 @@ def process_folder(folder_path, pattern, use_ocr, dry_run=False, name_prefix=Non
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success_count = 0
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rename_count = 0
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for pdf_file in folder.glob('*.pdf'):
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# Use simple case-insensitive matching
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pdf_files = [f for f in folder.iterdir() if f.is_file() and f.suffix.lower() == '.pdf']
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for pdf_file in pdf_files:
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pdf_count += 1
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numbers = extract_bates_numbers(pdf_file, pattern, use_ocr)
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if numbers:
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